bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com SBS v1.1-Compliant Gas Gauge IC Check for Samples: bq2060A FEATURES 1 * * * * * * * * * * Provides Accurate Measurement of Available Charge in NiCd, NiMH, Li-Ion, and Lead-Acid Batteries Supports SBS Smart Battery Data Specification v1.1 Supports the 2-Wire SMBus v1.1 Interface With PEC or 1-Wire HDQ16 Reports Individual Cell Voltages Monitors and Provides Control to Charge and Discharge FETs in Li-Ion Protection Circuit Provides 15-Bit Resolution for Voltage, Temperature, and Current Measurements Measures Charge Flow Using a V-to-F Converter With Offset of Less Than 16 V After Calibration Consumes Less Than 0.5 mW Operating Drives a 4- or 5-Segment LED Display for Remaining Capacity Indication 28-Pin 150-Mil (3,8-mm) SSOP DESCRIPTION The bq2060A SBS-compliant gas gauge IC for battery pack or in-system installation maintains an accurate record of available charge in rechargeable batteries. The bq2060A monitors capacity and other critical battery parameters for NiCd, NiMH, Li-ion, and lead-acid chemistries. The bq2060A uses a voltage-to-frequency converter with automatic offset error correction for charge and discharge counting. For voltage, temperature, and current reporting, the bq2060A uses an A-to-D converter. The onboard ADC also monitors individual cell voltages in a Li-ion battery pack and allows the bq2060A to generate control signals that may be used with a pack supervisor to enhance pack safety. The bq2060A supports the smart battery data (SBData) commands and charge-control functions. It communicates data using the system management bus (SMBus) 2-wire protocol or the Benchmarq 1-wire HDQ16 protocol. The data available include the remaining battery capacity, temperature, voltage, current, and remaining run-time predictions. The bq2060A provides LED drivers and a pushbutton input to depict remaining battery capacity from full to empty in 20% or 25% increments with a 4- or 5-segment display. The bq2060A works with an external EEPROM. The EEPROM stores the configuration information for the bq2060A, such as battery chemistry, self-discharge rate, rate compensation factors, measurement calibration, and design voltage and capacity. The bq2060A uses the programmable self-discharge rate and other compensation factors stored in the EEPROM to accurately adjust remaining capacity for use and standby conditions based on time, rate, and temperature. The bq2060A also automatically calibrates or learns the true battery capacity in the course of a discharge cycle from near-full to near-empty levels. The REG output regulates the operating voltage for the bq2060A from the battery cell stack using an external JFET. PIN CONNECTIONS 150-Mil (3,8-mm) SSOP 28-Pin 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright (c) 2001-2011, Texas Instruments Incorporated bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. Pin Descriptions PIN NAME DESCRIPTION NUMBER HDQ16 1 Serial communication input/output. Open-drain bidirectional communications port ESCL 2 Serial memory clock. Output to clock the data transfer between the bq2060A and the external nonvolatile configuration memory ESDA 3 Serial memory data and address. Bidirectional pin used to transfer address and data to and from the bq2060A and the external nonvolatile configuration memory. RBI 4 Register backup input. Input that provides backup potential to the bq2060A registers during periods of low operating voltage. RBI accepts a storage capacitor or a battery input. 5 Regulator output. Output to control an n-JFET for VCC regulation to the bq2060A from the battery potential 6 EEPROM supply output. Output that supplies power to the external EEPROM configuration memory 7 Supply voltage input 8 Ground 9 Display control input. Input that controls the LED drivers LED1-LED5 REG VOUT (1) (1) VCC VSS DISP LED1-LED5 10-14 LED display segment outputs. Outputs that each may drive an external LED DFC 15 Discharge FET control. Output to control the discharge FET in the Li-ion pack protection circuitry CFC 16 Charge FET control output. Output to control the charge FET in the Li-ion pack protection circuitry CVON 17 Cell voltage divider control output. Output control for external FETs to connect the cells to the external voltage dividers during cell voltage measurements THON 18 Thermistor bias control. Output control for external FETs to connect the thermistor bias resistor during a temperature measurement TS 19 Thermistor voltage input. Input connection for a thermistor to monitor temperature SRC 20 Current sense input. Input to monitor instantaneous current SR1- SR2 21-22 Charge-flow sense resistor inputs. Input connections for a small value sense resistor to monitor the battery charge and discharge current flow VCELL1-VC ELL4 23-26 Single-cell voltage inputs. Inputs that monitor the series element cell voltages SMBD 27 SMBus data. Open-drain bidirectional pin used to transfer address and data to and from the bq2060A SMBC 28 SMBus clock. Open-drain bidirectional pin used to clock the data transfer to and from the bq2060A (1) CAUTION: Recent changes to some EEPROM ICs have made the timing of the VOUT pin unreliable. It is strongly recommended that the EEPROM is powered from the VCC pin (pin 7). Also, it is acceptable to short pins 6 and 7, if needed. ORDERING INFORMATION (1) 2 For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI Web site at www.ti.com. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com ABSOLUTE MAXIMUM RATINGS Supply voltage, VCC MIN MAX -0.3 6 V -0.3 6 V VSS - 0.3 V + 0.3 to CC V Relative to VSS HDQ16, SMBC, SMBD relative to VSS Input Voltage, VIN All other pins UNIT Operating temperature, TOPR -20 70 C Junction temperature, TJ -40 125 C NOTES Commercial DC ELECTRICAL CHARACTERISTICS VCC = 2.7 V to 3.7 V, TOPR = -20C to 70C, unless otherwise noted SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX 2.7 3.3 3.7 UNIT V 180 235 A 5 10 A 0.2 A VCC Supply voltage ICC Operating current VOUT inactive ISLP Low-power storage mode current 1.5 V < VCC < 3.7 V ILVOUT VOUT leakage current VOUT inactive VOUT source current VOUT active, VCC - 0.6 V Output voltage low: LED1-LED5, CFC,DFC IOLS = 5 mA 0.4 V Output voltage low: THON, CVON IOLS = 5 mA 0.36 V -0.3 0.8 V 2 VCC + 0.3 V 0.4 V 0.8 V 1.7 6.0 V VSS - 0.3 1.25 V 50 nA IVOUT VOLS VIL Input voltage low DISP VIH Input voltage high DISP VOL Output voltage low SMBC, SMBD, HDQ16, ESCL, ESDA VILS Input voltage low SMBC, SMBD, HDQ16, ESCL, ESDA VIHS Input voltage high SMBC, SMBD, HDQ16, ESCL, ESDA VAI Input voltage range VCELL1-4, TS, SRC -0.2 -5 mA IOL = 1 mA -0.3 VRBI > 3 V, VCC < 2 V IRB RBI data-retention input current 10 VRBI RBI data-retention voltage 1.3 V ZAI1 Input impedance: SR1, SR2 0-1.25 V 10 M ZAI2 Input impedance: VCELL1-4, TS, SRC 0-1.25 V 5 M VFC CHARACTERISTICS VCC = 3.1 to 3.5 V, TOPR = -0C to 70C, unless otherwise noted SYMBOL PARAMETER TEST CONDITIONS MIN VSR Input voltage range, VSR2 and VSR1 VSR = VSR2- VSR1 -0.25 VSROS VSR input offset VSR2 = VSR1, auto-correction disabled -250 VSRCOS Calibrated offset RMVCO Supply voltage gain coefficient (1) Temperature gain coefficient (1) INL Integral nonlinearity error VCC = 3.3 V Total deviation TOPR = -20C to 70C Slope for TOPR = -0C to 50C Total deviation TOPR = -0C to 50C (1) -50 -16 Slope for TOPR = -20C to 70C RMTCO TYP TOPR = 0C-50C 0.8 MAX UNIT +0.25 V 250 V +16 V 1.2 %/V %/C -0.09 +0.09 -1.6% 0.1% -0.05 +0.05 -0.6% %/C 0.1% 0.21% RM(TCO) total deviation is from the nominal gain at 25C. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 3 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com REG CHARACTERISTICS TOPR = -20C to 70C SYMBOL VRO IREG 4 PARAMETER Normal mode: REG controlled output voltage Sleep mode: REG controlled output voltage TEST CONDITIONS MIN TYP MAX 3.1 3.3 3.5 JFET: Rds(on) < 150 , Vgs(off) < -3 V at 10 A UNIT V 4 REG output current 1 Submit Documentation Feedback A Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com SMBus AC SPECIFICATIONS VCC = 2.7 V to 3.7 V, TOPR = -20C to 70C, unless otherwise noted SYMBOL PARAMETER TEST CONDITIONS fSMB SMBus operating frequency Slave mode, SMBC 50% duty cycle fMAS SMBus master clock frequency Master mode, no clock low slave extend tBUF Bus free time between start and stop tHD:STA Hold time after (repeated) start tSU:STA Repeated start setup time tSU:STO Stop setup time tHD:DAT Data hold time tSU:DAT Data setup time tTIMEOUT Error signal/detect tLOW Clock low period tHIGH 10 MAX UNIT 100 kHz 51.2 kHz 4.7 s 4 s s 4 s Receive mode 0 ns Transmit mode 300 ns 250 (1) Clock high period See (2) tLOW:SEXT Cumulative clock low slave extend time See tLOW:MEXT Cumulative clock low master extend time See (4) TYP 4.7 See (1) (2) (3) MIN ns 25 35 ms s 4.7 50 s (3) 25 ms (4) 10 ms 4 The bq2060A times out when any clock low exceeds TTIMEOUT. THIGH Max. is minimum bus idle time. SMBC = 1 for t > 50 ms causes reset of any transaction involving bq2060A that is in progress. TLOW:SEXT is the cumulative time a slave device is allowed to extend the clock cycles in one message from initial start to the stop. The bq2060A typically extends the clock only 20 ms as a slave in the read byte or write byte protocol. TLOW:MEXT is the cumulative time a master device is allowed to extend the clock cycles in one message from initial start to the stop. The bq2060A typically extends the clock only 20 ms as a master in the read byte or write byte protocol. HDQ16 AC SPECIFICATIONS VCC = 2.7 V to 3.7 V, TOPR = -20C to 70C, unless otherwise noted SYMBOL PARAMETER TEST CONDITIONS MIN TYP MAX 190 205 250 s Start hold time, host to bq2060A(write) 5 -- -- ns Start hold time, bq2060A to host (read) 32 -- -- s DSU Data setup time -- -- 50 s tDSUB Data setup time -- -- 50 s tDH Data hold time 100 -- -- s tDV Data valid time 80 -- -- s tSSU Stop setup time -- -- 145 s tSSUB Stop setup time -- -- 145 s tRSPS Response time, bq2060A to host 190 -- 320 s t] Break time 190 -- -- s tBR Break recovery time 40 -- -- s tCYCH Cycle time, host to bq2060A (write) 190 tCYCB Cycle time, bq2060A to host (read) tSTRH tSTRB UNIT s Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 5 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com THIGH SMBC THD:STA TLOW TSU:STA TSU:STO SMBD THD:DAT TSU:DAT TBUF Figure 1. SMBus Timing Data Figure 2. HDQ16 Break Timing Figure 3. HDQ16 Host to bq2060A Figure 4. HDQ16 bq2060A to Host FUNCTIONAL DESCRIPTION General Operation The bq2060A determines battery capacity by monitoring the amount of charge input or removed from a rechargeable battery. In addition to measuring charge and discharge, the bq2060A measures battery voltage, temperature, and current, estimates battery self-discharge, and monitors the battery for low-voltage thresholds. The bq2060A measures charge and discharge activity by monitoring the voltage across a small-value series sense resistor between the battery negative terminal and the negative terminal of the battery pack. The available battery charge is determined by monitoring this voltage and correcting the measurement for environmental and operating conditions. 6 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Figure 5 shows a typical bq2060A-based battery-pack application. The circuit consists of the LED display, voltage and temperature measurement networks, EEPROM connections, a serial port, and the sense resistor. The EEPROM stores basic battery-pack configuration information and measurement-calibration values. The EEPROM must be programmed properly for bq2060A operation. Table 9 shows the EEPROM memory map and outlines the programmable functions available in the bq2060A. The bq2060A accepts an NTC thermistor (Semitec 103AT) for temperature measurement. The bq2060A uses the thermistor temperature to monitor battery-pack temperature, detect a battery full-charge condition, and compensate for self-discharge and charge/discharge battery efficiencies. Measurements The bq2060A uses a fully differential, dynamically balanced voltage-to-frequency converter (VFC) for charge measurement and a sigma delta analog-to-digital converter (ADC) for battery voltage, current, and temperature measurement. Voltage, current, and temperature measurements are made every 2-2.5 seconds, depending on the bq2060A operating mode. Maximum times occur with compensated EDV, mWh mode, and maximum allowable discharge rate. Any AtRate computations requested or scheduled (every 20 seconds) may add up to 0.5 second to the time interval. Charge and Discharge Counting The VFC measures the charge and discharge flow of the battery by monitoring a small-value sense resistor between the SR1 and SR2 pins as shown in Figure 5. The VFC measures bipolar signals up to 250 mV. The bq2060A detects charge activity when VSR = VSR2 - VSR1 is positive and discharge activity when VSR = VSR2 - VSR1 is negative. The bq2060A continuously integrates the signal over time using an internal counter. The fundamental rate of the counter is 6.25 Vh. Offset Calibration The bq2060A provides an auto-calibration feature to cancel the voltage offset error across SR1 and SR2 for maximum charge measurement accuracy. The calibration routine is initiated by issuing a command to Manufacturer Access(). The bq2060A is capable of automatic offset calibration down to 6.25 V. Offset cancellation resolution is less than 1 V. Digital Filter The bq2060A does not measure charge or discharge counts below the digital filter threshold. The digital filter threshold is programmed in the EEPROM and should be set sufficiently high to prevent false signal detection with no charge or discharge flowing through the sense resistor. Voltage While monitoring SR1 and SR2 for charge and discharge currents, the bq2060A monitors the battery-pack potential and the individual cell voltages through the VCELL1 - VCELL4 pins. The bq2060A measures the pack voltage and reports the result in Voltage(). The bq2060A can also measure the voltage of up to four series elements in a battery pack. The individual cell voltages are stored in the optional Manufacturer Function area. The VCELL1 - VCELL4 inputs are divided down from the cells using precision resistors, as shown in Figure 5. The maximum input for VCELL1 - VCELL4 is 1.25 V with respect to VSS. The voltage dividers for the inputs must be set so that the voltages at the inputs do not exceed the 1.25-V limit under all operating conditions. Also, the divider ratios on VCELL1 - VCELL2 must be half of that of VCELL3 - VCELL4. To reduce current consumption from the battery, the CVON output may be used to connect the divider to the cells only during measurement period. CVON is high impedance for 250 ms (12.5% duty cycle) when the cells are measured, and driven low otherwise (see Table 1). The SRC input of the bq2060A measures battery charge and discharge current. The SRC ADC input converts the current signal from the series sense resistor and stores the result in Current(). The full-scale input range to SBC is limited to 250 mV as shown in Table 2. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 7 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com VCC bq2060 LED1 LED2 To Pack VCC Protection Circuitry A0 VCC VCC LED3 CVON LED4 VCELL4 LED5 VCELL3 CFC VCELL2 DFC VCELL1 G S D SST113 PACK+ RBI DISP EEPROM REG VCC VCC SRC A1 A2 ESCL SCL SR2 R5 WP VSS SDA VCC ESDA SR1 PACK- THON SMBC SMBC TS SMBD SMBD VSS HDQ16 Thermistor HDQ Figure 5. Battery Pack Application Diagram - LED Display and Series Cell Monitoring 8 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Table 1. Example VCELL1-VCELL4 Divider and Input Range Table 2. SRC Input Range SENSE RESISTOR () FULL-SCALE INPUT (A) 0.02 12.5 0.03 8.3 VOLTAGE INPUT VOLTAGE DIVISION RATIO FULL-SCALE INPUT (V) VCELL4 16 20 VCELL3 16 20 0.05 5 VCELL2 8 10 0.1 2.5 VCELL1 8 10 Current The SRC input of the bq2060A measures battery charge and discharge current. The SRC ADC input converts the current signal from the series sense resistor and stores the result in Current(). The full-scale input range to SBC is limited to 250 mV, as shown in Table 2. Temperature The TS input of the bq2060A along with an NTC thermistor measures the battery temperature as shown in Figure 5. The bq2060A reports temperature in Temperature(). THON may be used to connect the bias source to the thermistor when the bq2060A samples the TS input. THON is high impedance for 60 ms when the temperature is measured, and driven low otherwise. GAS GAUGE OPERATION General The operational overview in Figure 6 illustrates the gas gauge operation of the bq2060A. Table 3 and subsequent text describes the bq2060A registers. The bq2060A accumulates a measure of charge and discharge currents and estimates self-discharge of the battery. The bq2060A compensates the charge current measurement for temperature and state-of-charge of the battery. It also adjusts the self-discharge estimation based on temperature. The main counter RemainingCapacity()(RM) represents the available capacity or energy in the battery at any given time. The bq2060A adjusts RM for charge, self-discharge, and leakage compensation factors. The information in the RM register is accessible through the communications ports and is also represented through the LED display. The FullChargeCapacity()(FCC) register represents the last measured full discharge of the battery. It is used as the battery full-charge reference for relative capacity indication. The bq2060A updates FCC when the battery undergoes a qualified discharge from nearly full to a low battery level. FCC is accessible through the serial communications ports. The Discharge Count Register (DCR) is a non-accessible register that only tracks discharge of the battery. The bq2060A uses the DCR register to update the FCC register if the battery undergoes a qualified discharge from nearly full to a low battery level. In this way, the bq2060A learns the true discharge capacity of the battery under system use conditions. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 9 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 Inputs www.ti.com Charge Current Battery Electronics Load Estimate Discharge Current Self-Discharge Timer Charge Efficiency Compensation Temperature Compensation - + Main Counters and Capacity Reference (FCC) - - Remaining Capacity (RM) + Full Charge Capacity (FCC) + + Discharge Count Qualified Register (DCR) Transfer Temperature, Other Data Outputs Chip-Controlled Available Charge LED Display Two-Wire Serial Port Figure 6. bq2060A Operational Overview Table 3. bq2060A Register Functions FUNCTION 10 COMMAND CODE SMBus HDQ16 SMBus ACCESS UNITS ManufacturerAccess 0x00 0x00 read/write n/a RemainingCapacityAlarm 0x01 0x01 read/write mAh, 10 mWh RemainingTimeAlarm 0x02 0x02 read/write minutes BatteryMode 0x03 0x03 read/write n/a AtRate 0x04 0x04 read/write mA, 10 mW AtRateTimeToFull 0x05 0x05 read minutes AtRateTimeToEmpty 0x06 0x06 read minutes AtRateOK 0x07 0x07 read Boolean Temperature 0x08 0x08 read 0.1 K Voltage 0x09 0x09 read mV Current 0x0a 0x0a read mA AverageCurrent 0x0b 0x0b read mA MaxError 0x0c 0x0c read percent percent RelativeStateOfCharge 0x0d 0x0d read AbsoluteStateOfCharge 0x0e 0x0e read percent RemainingCapacity 0x0f 0x0f read mAh, 10 mWh FullChargeCapacity 0x10 0x10 read mAh, 10 mWh RunTimeToEmpty 0x11 0x11 read minutes Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Table 3. bq2060A Register Functions (continued) COMMAND CODE SMBus HDQ16 SMBus ACCESS UNITS AverageTimeToEmpty 0x12 0x12 read minutes AverageTimeToFull 0x13 0x13 read minutes ChargingCurrent 0x14 0x14 read mA ChargingVoltage 0x15 0x15 read mV Battery Status 0x16 0x16 read n/a CycleCount 0x17 0x17 read cycles DesignCapacity 0x18 0x18 read mAh, 10 mWh DesignVoltage 0x19 0x19 read mV SpecificationInfo 0x1a 0x1a read n/a ManufactureDate 0x1b 0x1b read n/a integer FUNCTION SerialNumber 0x1c 0x1c read Reserved 0x1d-0x1f 0x1d-0x1f - - ManufacturerName 0x20 0x20-0x25 read string DeviceName 0x21 0x28-0x2b read string DeviceChemistry 0x22 0x30-0x32 read string ManufacturerData 0x23 0x38-0x3b read string n/a Pack Status 0x2f (LSB) 0x2f (LSB) read/write Pack Configuration 0x2f (MSB) 0x2f (MSB) read/write n/a VCELL4 0x3c 0x3c read/write mV VCELL3 0x3d 0x3d read/write mV VCELL2 0x3e 0x3e read/write mV VCELL1 0x3f 0x3f read/write mV MAIN GAS GAUGE REGISTERS RemainingCapacity() (RM) RM represents the remaining capacity in the battery. The bq2060A computes RM in either mAh or 10 mWh, depending on the selected mode. On initialization, the bq2060A sets RM to 0. RM counts up during charge to a maximum value of FCC and down during discharge and self-discharge to 0. In addition to charge and self-discharge compensation, the bq2060A calibrates RM at three low-battery-voltage thresholds, EDV2, EDV1, and EDV0 and three programmable midrange thresholds VOC25, VOC50, and VOC75. This provides a voltage-based calibration to the RM counter. DesignCapacity() (DC) The DC is the user-specified battery full capacity. It is calculated from Pack CapacityEE 0x3a-0x3b and is represented in mAh or 10 mWh. It also represents the full-battery reference for the absolute display mode. FullChargeCapacity() (FCC) FCC is the last measured discharge capacity of the battery. It is represented in either mAh or 10 mWh depending on the selected mode. On initialization, the bq2060A sets FCC to the value stored in Last Measured Discharge EE 0x38-0x39. During subsequent discharges, the bq2060A updates FCC with the last measured discharge capacity of the battery. The last measured discharge of the battery is based on the value in the DCR register after a qualified discharge occurs. Once updated, the bq2060A writes the new FCC value to EEPROM in mAh to Last Measured Discharge. FCC represents the full battery reference for the relative display mode and relative state of charge calculations. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 11 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Discharge Count Register (DCR) The DCR register counts up during discharge, independent of RM. DCR can continue to count even after RM has counted down to 0. Prior to RM = 0, discharge activity, light discharge estimation and self-discharge increment DCR. After RM = 0, only discharge activity increments DCR. The bq2060A initializes DCR to FCC - RM when FCC-RM is less than twice the programmed value in Near Full EE 0x55. The DCR initial value of FCC - RM is reduced by FCC/128 if SC = 0 (bit 2 in Control Mode) and is not reduced if SC = 1. DCR stops counting when the battery voltage reaches the EDV2 threshold on discharge. Capacity Learning (FCC Update) and Qualified Discharge The bq2060A updates FCC with an amount based on the value in DCR if a qualified discharge occurs. The new value for FCC equals the DCR value plus the programmable nearly full and low battery levels, according to the following equation: FCC(new) = DCR(final) = DCR(initial) + measured discharge to EDV2 + (FCCxBatteryLow%) (1) Where: BatteryLow% = (value stored in EE 0x54) + 2.56 A qualified discharge occurs if the battery discharges from RM FCC - Near Full x 2 to the EDV2 voltage threshold with the following conditions: * No valid charge activity occurs during the discharge period. A valid charge is defined as an input of 10 mAh into the battery. * No more than 256 mAh of self-discharge and/or light discharge estimation occurs during the discharge period. * The temperature does not drop below 5C during the discharge period. * The battery voltage reaches the EDV2 threshold during the discharge period and the voltage was between the EDV2 threshold and [EDV2 threshold - 256 mV] when the bq2060A detected EDV2. * No midrange voltage correction occurs during the discharge period. * No overload condition occurs when voltage EDV2 threshold FCC cannot be reduced by more than 256 mAh or increased by more than 512 mAh during any single update cycle. FCC becomes invalid if it is initialized or updated to a value less then 256 mAH. FCC becomes invalid if it is initialized or updated to a value less than 256 mAH. The bq2060A saves the new FCC value to the EEPROM within 4 s of being updated. End-of-Discharge Thresholds and Capacity Correction The bq2060A monitors the battery for three low-voltage thresholds, EDV0, EDV1, and EDV2. The EDV thresholds are programmed in EDVF/EDV0 EE 0x72-0x73, EMF/EDV1EE 0x74-0x75, and EDV C1/C0 Factor /EDV2 EE 0x78-0x79. If the CEDV bit in Pack Configuration is set, automatic EDV compensation is enabled, and the bq2060A computes the EDV0, EDV1, and EDV2 thresholds based on the values in EE 0x72-0x7d, 0x06, and the battery load current, temperature, capacity, and cycle count. The bq2060A disables EDV detection if Current() exceeds the Overload Current threshold programmed in EE 0x46-EE 0x47. The bq2060A resumes EDV threshold detection after the Current() drops below the overload current threshold. Any EDV threshold detected is reset after 10 mAh of charge is applied. The bq2060A uses the thresholds to apply voltage-based corrections to the RM register according to Table 4. Table 4. State of Charge Based on Low Battery Voltage THRESHOLD STATE OF CHARGE IN RM EDV0 0% EDV1 3% EDV2 Battery Low % The bq2060A adjusts RM as it detects each threshold. If the voltage threshold is reached before the corresponding capacity on discharge, the bq2060A reduces RM to the appropriate amount as shown in Table 4. If RM reaches the capacity level before the voltage threshold is reached on discharge, the bq2060A prevents RM from decreasing until the battery voltage reaches the corresponding threshold, but only on a full learning-cycle discharge (VDQ = 1). The EDV1 threshold is ignored if Miscellaneous Options bit 7 = 1. 12 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Self-Discharge The bq2060A estimates the self-discharge of the battery to maintain an accurate measure of the battery capacity during periods of inactivity. The algorithm for self-discharge estimation takes a programmed estimate for the expected self-discharge rate at 25C stored in EEPROM and makes a fixed reduction to RM of an amount equal to RemainingCapacity()/256. The bq2060A makes the fixed reduction at a varying time interval that is adjusted to achieve the desired self-discharge rate. This method maintains a constant granularity of 0.39% for each self-discharge adjustment, which may be performed multiple times per day, instead of once per day with a potentially large reduction. The self-discharge estimation rate for 25C is doubled for each 10 degrees above 25C or halved for each 10 degrees below 25C. The following table shows the relation of the self-discharge estimation at a given temperature to the rate programmed for 25C (Y% per day): TEMPERATURE( C) SELF-DISCHARGE RATE Temp < 10 1/4Y% per day 10 Temp < 20 1/2 Y% per day 20 Temp < 30 Y% per day 30 Temp < 40 2Y% per day 40 Temp < 50 4Y% per day 50 Temp < 60 8Y% per day 60 Temp < 70 16Y% per day 70 Temp 32Y% per day The interval at which RM is reduced is given by the following equation, where n is the appropriate factor of 2 (n = 1/ 4, 1/ 2, 1, 2 . . . ): Self-DischargeUpdateTime = 640 x 13500 seconds 256 x n x (Y% per day) (2) The timer that keeps track of the self-discharge update time is halted whenever charge activity is detected. The timer is reset to zero if the bq2060A reaches the RemainingCapacity()=FullChargeCapacity() condition while charging. Example: If T = 35C (n = 2) and programmed self-discharge rate Y is 2.5 (2.5% per day at 25C), the bq2060A reduces RM by RM/256 (0.39%) every 256 640 n 135000 + 6750 seconds (Y% per day) (3) This means that a 0.39% reduction of RM is made 12.8 times per day to achieve the desired 5% per day reduction at 35C. Figure 7 illustrates how the self-discharge estimate algorithm adjusts RemainingCapacity() vs. temperature. Light Discharge or Suspend Current Compensation The bq2060A can be configured in two ways to compensate for small discharge currents that produce a signal below the digital filter. First, the bq2060A can decrement RM and DCR at a rate determined by the value stored in Light Discharge Current EE 0x2b when it detects no discharge activity and the SMBC and SMBD lines are high. Light Discharge Current has a range of 44 A to 11.2 mA. Alternatively, the bq2060A can be configured to disable the digital filter for discharge when the SMBC and SMBD lines are high. In this way, the digital filter does not mask the leakage current signal. The bq2060A is configured in this mode by setting the NDF bit in Control Mode. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 13 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com 1200 Capacity - mAh 1000 15C 800 600 25C 400 35C 200 45C 0 0 10 20 30 40 50 60 70 t - Time - days Figure 7. Self-Discharge at 2.5%/Day at 25C Midrange Capacity Corrections The bq2060A applies midrange capacity corrections when the VCOR bit is set in Pack Configuration. The bq2060A adjusts RM to the associated percentage at three different voltage levels VOC25, VOC50, and VOC75. The VOC values represent the open-circuit battery voltage at which RM corresponds to the associated state of charge for each threshold. THRESHOLD ASSOCIATED STATE OF CHARGE VOC25 25% VOC50 50% VOC75 75% For the midrange corrections to occur, the temperature must be in the range of 19C to 31C inclusive and the Current() and AverageCurrent() must both be between -64 mA and 0. For a correction to occur, the bq2060A must also detect the need for correction during two adjacent measurements separated by 20 s. The second measurement is not required if the first measurement occurs immediately after a device reset. The bq2060A makes midrange corrections as shown in Table 5. Charge Control Charging Voltage and Current Broadcasts The bq2060A supports SBS charge control by broadcasting the ChargingCurrent() and ChargingVoltage() to the Smart Charger address. The bq2060A broadcasts the requests every 10 s. The bq2060A updates the values used in the charging current and voltage broadcasts based on the battery state of charge, voltage, and temperature. The fast-charge rate is programmed in Fast-Charging Current EE 0x1a-0x1b while the charge voltage is programmed in Charging Voltage EE 0x0a-0x0b. The bq2060A internal charge control is compatible with popular rechargeable chemistries. The primary charge-termination techniques include a change in temperature over a change in time (T/t) and current taper, for nickel-based and Li-ion chemistries, respectively. The bq2060A also provides pre-charge qualification and a number of safety charge suspensions based on current, voltage, temperature, and state of charge. Alarm Broadcasts to Smart Charger and Host If any of the bits 8-15 in BatteryStatus() is set, the bq2060A broadcasts an AlarmWarning() message to the host address. If any of the bits 12-15 in BatteryStatus() is set, the bq2060A also sends an AlarmWarning() message to the Smart Charger address. The bq2060A repeats the AlarmWarning() message every 10 s until the bits are cleared. 14 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Pre-Charge Qualification The bq2060A sets ChargingCurrent() to the pre-charge rate as programmed in Pre-Charge Current EE 0x1e-0x1f under the following conditions: * Voltage: The bq2060A requests the pre-charge charge rate when Voltage() drops below the EDV0 threshold (compensated or fixed EDVs). Once requested, a pre-charge rate remains until Voltage() increases above the EDVF threshold. The bq2060A also broadcasts the pre-charge value immediately after a device reset until Voltage() is above the EDVF threshold. This threshold is programmed in EDVF/EDV0 EE 0x72-0x73. * Temperature: The bq2060A requests the pre-charge rate when Temperature() is between 0C and 5C. Temperature() must rise above 5C before the bq2060A requests the fast-charge rate. Charge Suspension The bq2060A may temporarily suspend charge if it detects a charging fault. A charging fault includes the following conditions. * Overcurrent: An overcurrent condition exists when the bq2060A measures the charge current to be more than the Overcurrent Margin above the ChargingCurrent(). Overcurrent Margin is programmed in EE 0x49. On detecting an overcurrent condition, the bq2060A sets the ChargingCurrent() to zero and sets the TERMINATE_CHARGE_ALARM bit in BatteryStatus(). The overcurrent condition and TERMINATE_ CHARGE_ALARM are cleared when the measured current drops below the ChargingCurrent plus the Overcurrent Margin. * Overvoltage: An overvoltage condition exists when the bq2060A measures the battery voltage to be more than the Overvoltage Margin above the ChargingVoltage() or a Li-ion cell voltage has exceeded the overvoltage limit programmed in Cell Under-/Overvoltage. Overvoltage Margin is programmed in EE 0x48 and Cell Under-/Overvoltage in EE 0x4a. On detecting an overvoltage condition, the bq2060A sets the ChargingCurrent() to zero and sets the TERMINATE_CHARGE_ALARM bit in BatteryStatus(). The bq2060A clears the TERMINATE_ CHARGE_ALARM bit when it detects that the battery is no longer being charged (DISCHARGING bit set in BatteryStatus()). The bq2060A continues to broadcast zero charging current until the overvoltage condition is cleared. The overvoltage condition is cleared when the measured battery voltage drops below the ChargingVoltage() plus the Overvoltage Margin or when the CVOV bit is reset. * Overtemperature: An overtemperature condition exists when Temperature() is greater than or equal to the MaxT value programmed in EE 0x45 (most significant nibble). On detecting an overtemperature condition, the bq2060A sets the ChargingCurrent() to zero and sets the OVER_TEMP_ALARM and TERMINATE_CHARGE_ ALARM bit in BatteryStatus() and the CVOV bit in Pack Status. The overtemperature condition is cleared when Temperature() is equal to or below (MaxT - 5C). The temperature set by MaxT is increased by 16C if bit 5 in Miscellaneous Options is set. * Overcharge: An overcharge condition exists if the battery is charged more than the Maximum Overcharge value after RM = FCC. Maximum Overcharge is programmed in EE 0x2e-0x2f. On detecting an overcharge condition, the bq2060A sets the ChargingCurrent() to zero and sets the OVER_CHARGED_ALARM, TERMINATE_CHARGE_ ALARM, and FULLY_CHARGED bits in BatteryStatus(). The bq2060A clears the OVER_ CHARGED_ALARM and TERMINATE_CHARGE_ ALARM when it detects that the battery is no longer being charged. The FULLY_CHARGED bit remains set and the bq2060A continues to broadcast zero charging current until RelativeStateOfCharge() is less than Fully Charged Clear% programmed in EE 0x4c. The counter used to track overcharge capacity is reset with 2 mAh of discharge. * Undertemperature: An undertemperature condition exists if Temperature() < 0C. On detecting an under temperature condition, the bq2060A sets ChargingCurrent() to zero. The bq2060A sets ChargingCurrent() to the appropriate pre-charge rate or fast-charge rate when Temperature() 0C. Table 5. Midrange Corrections CONDITION Voltage() RESULT VOC75 and RelativeStateOfCharge() 63% RelativeStateOfCharge()75% < VOC75 and RelativeStateOfCharge() 87% RelativeStateOfCharge()75% VOC50 and RelativeStateOfCharge() 38% RelativeStateOfCharge()50% <VOC50 and RelativeStateOfCharge() 62% RelativeStateOfCharge()50% VOC25 and RelativeStateOfCharge() 13% RelativeStateOfCharge()25% < VOC25 and RelativeStateOfCharge() 37% RelativeStateOfCharge()25% Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 15 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Primary Charge Termination The bq2060A terminates charge if it detects a charge-termination condition. A charge-termination condition includes the following. * T/t:For T/t, the bq2060A detects a change in temperature over many seconds. The T/t setting is programmable in both the temperature step, DeltaT (1.6C - 4.6C), and the time step, DeltaT Time (20 s - 320 s). Typical settings for 1C/minute include 2C/120 s and 3C/180 s. Longer times are required for increased slope resolution. The DeltaT value is programmed in EE 0x45 (least significant nibble) and the Delta T Time in EE 0x4e. In addition to the T/t timer, a holdoff timer starts when the battery is being charged at more than 255 mA and the temperature is above 25C. Until this timer expires, T/t detection is suspended. If Current() drops below 256 mA or Temperature() below 25C, the holdoff timer resets and restarts only when the current and temperature conditions are met again. The holdoff timer is programmable (20 s - 320 s) with Holdoff Time value in EE 0x4f. * Current Taper: For current taper, ChargingVoltage() must be set to the pack voltage desired during the constant-voltage phase of charging. The bq2060A detects a current taper termination when the pack voltage is greater than the voltage determined by Current Taper Qual Voltage in EE 0x4f and the charging current is below a threshold determined by Current Taper Threshold in EE 0x4e, for at least 80 s. The bq2060A uses the VFC to measure current for current taper termination. The current must also remain above 0.5625/RS mA to qualify the termination condition. Once the bq2060A detects a primary charge termination, it sets the TERMINATE_CHARGE_ALARM and FULLY_CHARGED bits in BatteryStatus(), and sets the ChargingCurrent() to the maintenance charge rate as programmed in Maintenance Charging Current EE 0x1c-0x1d. On termination, the bq2060A also sets RM to a programmed percentage of FCC, provided that RelativeStateOfCharge() is below the desired percentage of FCC and the CSYNC bit in Pack Configuration EE 0x3f is set. The programmed percentage of FCC, Fast Charge Termination %, is set in EE 0x4b. The bq2060A clears the FULLY_CHARGED bit when RelativeStateOfCharge() is less than the programmed Fully Charged Clear %. The bq2060A broadcasts the fast-charge rate when the FULLY_CHARGED bit is cleared and voltage and temperature permit. The bq2060A clears the TERMINATE_CHARGE_ALARM when it no longer detects that the battery is being charged or it no longer detects the termination condition. See Table 6 for a summary of BatteryStatus() alarm and status bit operation. Display Port General The display port drives a 4- or 5-LED bar-graph display. The display is activated by a logic signal on the DISP input. The bq2060A can display RM in either a relative or absolute mode with each LED representing a percentage of the full-battery reference. In relative mode, the bq2060A uses FCC as the full-battery reference; in absolute mode, it uses DC. The DMODE bit in Pack Configuration programs the bq2060A for the absolute or relative display mode. The LED bit in Control Mode programs the 4- or 5-LED option. A 5th LED can be used with the 4-LED display option to show when the battery capacity is to 100%. Activation The display may be activated at any time by a high-to-low transition on the DISP input. This is usually accomplished with a pullup resistor and a pushbutton switch. Detection of the transition activates the display and starts a 4-s display timer. The timer expires and turns off the display whether DISP was brought low momentarily or held low indefinitely. Reactivation of the display requires that the DISP input return to a logic-high state and then transition low again. The second high-to-low transition must occur after the display timer expires. The bq2060A requires the DISP input to remain stable for a minimum of 250 ms to detect the logic state. If the EDV0 bit is set, the bq2060A disables the LED display. The display is also disabled during a VFC calibration and should be turned off before entering low-power storage mode. Display Modes In relative mode, each LED output represents 20% or 25% of the RelativeStateOfCharge() value. In absolute mode, each LED output represents 20% or 25% of the AbsoluteStateOfCharge() value. Table 7 and Table 8 show the display operation. 16 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com In either mode, the bq2060A blinks the LED display if RemainingCapacity() is less than Remaining CapacityAlarm(). The display is disabled if EDV0 = 1. Secondary Protection for Li-ion The bq2060A has two pins, CFC and DFC, that can be used for secondary override control of a Li-ion protector or for blowing a fuse to disable the battery pack. The CFC pin is the Charge FET Control pin for secondary protector control or for blowing a fuse. The DFC pin is the Discharge FET Control pin for secondary protector control. Discharge current can cause an override of the CFC control, and charge current can cause an override of the DFC control. The CVOV, CVUV, and the true logic state of the CFC and DFC pins can be read in the lower nibble of Pack Status. The CVOV status flag is set if Voltage() ChargingVoltage() + Overvoltage Margin, any VCELL voltage Cell Overvoltage threshold, or if Temperature() MaxT. When CVOV = 1 and Miscellaneous Options bit 6 = 0, the CFC pin is pulled low unless the DISCHARGING bit in BatteryStatus() is set. If Temperature > Safety Overtemperature threshold, then it is pulled low even if the Discharging bit in BatteryStatus() is set. The formula for this description is: CFC = SOT or CVOV + DSG + MISC OPTION BIT 6 If Miscellaneous Options bit 6 = 1, the CFC pin is pulled low only if Temperature() > Safety Overtemperature threshold. Table 6. Alarm and Status Bit Summary (1) BATTERY STATE CONDITIONS CC() STATE AND BatteryStatus BIT SET CC() = FAST OR PRECHARGE CURRENT AND/OR BITS CLEARED Overcurrent C() CC() +Overcurrent Margin CC() = 0, TCA = 1 C() < CC() + Overcurrent Margin TCA = 1 DISCHARGING = 1 CC() = 0, CVOV = 1 V() < CV() + Overvoltage Margin Li-ion cell voltage Cell Over Voltage CC() = 0, OTA = 1, TCA = 1, CVOV = 1 T() MaxT - 5C or T() 43C CC() = 0, FC = 1 RSOC() < Fully Charged Cleared % OCA = 1, TCA = 1 DISCHARGING = 1 T() < 0C CC() = 0 0C T() < 5C, CC() = Pre-Charge Current; T() 5C, CC() = Fast-Charging Current RSOC() < Fully Charged Cleared % T/t or Current Taper CC() = Maintenance Charging Current, FC = 1 TCA = 1 DISCHARGING = 1 or termination condition is no longer valid. V() EDV2 or RM() < FCC() *Battery Low% FD = 1 RSOC() > 20% V() EDV0 TDA = 1 V() > EDV0 Overdischarged VCELL1, 2, 3 or 4 < Cell Under Voltage TDA = 1, CVUV = 1 VCELL1, 2, 3, or 4 Cell Under Voltage RM() = 0 TDA = 1 RM() > 0 Low capacity RM() < RCA() RCA = 1 RM() RCA() Low run-time ATTE() < RTA() RTA = 1 ATTE() RTA() Overvoltage V() CV() + Overvoltage Margin VCELL1, 2, 3, or 4 > Cell Over Voltage Over temperature T() MaxT Overcharge Capacity added after RM() = FCC() Maximum Overcharge Undertemperature Fast-charge termination Fully discharged (1) C() = Current(), CV() = ChargingVoltage(), CC() = ChargingCurrent(), V() = Voltage(), T() = Temperature(), TCA = TERMINATE_CHARGE_ALARM, OTA = OVER_TEMPERATURE_ALARM, OCA = OVER_CHARGED_ALARM, TDA = TERMINATE_DISCHARGE_ALARM, FC = FULLY_CHARGED, FD = FULLY_DISCHARGED, RSOC() = RelativeStateOfCharge(). RM() = RemainingCapacity(), RCA = REMAINING_CAPACITY_ALARM, RTA = REMAINING_TIME_ALARM, ATTE() = AverageTimeToEmpty(), RTA() = RemainingTimeAlarm(), RCA() = RemainingCapacityAlarm(), FCC() = FullChargeCapacity(). Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 17 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Table 7. 5-LED Display Mode 5-LED Display Option Condition Relative or Absolute StateOfCharge() LED1 LED2 LED3 LED4 LED5 EDV0 = 1 OFF OFF OFF OFF OFF <20% ON OFF OFF OFF OFF 20%, <40% ON ON OFF OFF OFF 40%, <60% ON ON ON OFF OFF 60%, <80% ON ON ON ON OFF 80% ON ON ON ON ON Table 8. 4-LED Display Mode 4-LED Display Option Condition Relative or Absolute StateOfCharge() LED1 LED2 LED3 LED4 EDV0 = 1 OFF OFF OFF OFF <25% ON OFF OFF OFF 25%, <50% ON ON OFF OFF 50%, <75% ON ON ON OFF 75% ON ON ON ON The CVUV status flag is set if any VCELL voltage < Cell Undervoltage threshold. When CVUV = 1, the DFC pin is pulled low unless DISCHARGING bit in BatteryStatus() is clear (not set). Cell Undervoltage and Cell Overvoltage limits may be programmed in the upper and lower nibbles of EE 0x4a. Safety Overtemperature threshold may be programmed in EE 0x09, and Miscellaneous Options is programmed in EE 0x08. Low-Power Storage Mode The bq2060A enters low-power mode 5 s to 8 s after receiving the Enable Low-Power command. In this mode, the bq2060A consumes less than 10 A. A rising edge on SMBC, SMBD, or HDQ16 restores the bq2060A to the full operating mode. The bq2060A does not perform any gas gauge functions during low-power storage mode. Device Reset The bq2060A can be reset when power is applied or by commands over the HDQ16 or SMBus. On reset, the bq2060A initializes its internal registers with the information contained in the configuration EEPROM. The following command sequence initiates a full bq2060A reset: Write 0xff5a to address 0x4f Write 0x0000 to address 0x7d Write 0x0080 to address 0x7d A partial reset of the bq2060A occurs if step 1 is omitted and all check-byte values previously loaded into RAM are still correct. All initial RAM values are read from EEPROM for both full and partial resets. A full reset initializes MaxError = 100%, sets RELEARN_FLAG (bit 7) = 1 in Battery Mode, and initializes RM from EE 0x2c-2d (should be zero for rechargeable batteries). A partial reset leaves MaxError, RELEARN_FLAG, and RM unchanged. The bq2060A delays reading the EEPROM for 700 ms after all resets to allow settling time for VCC. COMMUNICATION The bq2060A includes two types of communication ports: SMBus and HDQ16. The SMBus interface is a 2-wire bidirectional protocol using the SMBC (clock) and SMBD (data) pins. The HDQ16 interface is a 1-wire bidirectional protocol using the HDQ16 pin. All three communication lines are isolated from VCC and may be pulled up higher than VCC. Also, the bq2060A does not pull these lines low if VCC to the part is zero. HDQ16 should be pulled down with a 100-k resistor if not used. The communication ports allow a host controller, an SMBus compatible device, or other processor to access the memory registers of the bq2060A. In this way, a system can efficiently monitor and manage the battery. 18 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com SMBus The SMBus interface is a command-based protocol. A processor acting as the bus master initiates communication to the bq2060A by generating a START condition. A START condition consists of a high-to-low transition of the SMBD line while the SMBC is high. The processor then sends the bq2060A device address of 0001011 (bits 7-1) plus a R/W bit (bit 0) followed by an SMBus command code. The R/W bit and the command code instruct the bq2060A to either store the forthcoming data to a register specified by the SMBus command code or output the data from the specified register. The processor completes the access with a STOP condition. A STOP condition consists of a low-to-high transition of the SMBD line while the SMBC is high. With SMBus, the most significant bit of a data byte is transmitted first. In some instances, the bq2060A acts as the bus master. This occurs when the bq2060A broadcasts charging requirements and alarm conditions to device addresses 0x12 (SBS Smart Charger) and 0x10 (SBS Host Controller.) SMBus Protocol The bq2060A supports the following SMBus protocols: * Read Word * Write Word * Read Block A processor acting as the bus master uses the three protocols to communicate with the bq2060A. The bq2060A acting as the bus master uses the Write Word protocol. The SMBD and SMBC pins are open drain and require external pullup resistors. SMBus Packet Error Checking The bq2060A supports Packet Error Checking as a mechanism to confirm proper communication between it and another SMBus device. Packet Error Checking requires that both the transmitter and receiver calculate a Packet Error Code (PEC) for each communication message. The device that supplies the last byte in the communication message appends the PEC to the message. The receiver compares the transmitted PEC to its PEC result to determine if there is a communication error. PEC Protocol The bq2060A can receive or transmit data with or without PEC. Figure 9 shows the communication protocol for the Read Word, Write Word, and Read Block messages without PEC. Figure 8 includes PEC. In the Write Word protocol, the bq2060A receives the PEC after the last byte of data from the host. If the host does not support PEC, the last byte of data is followed by a STOP condition. After receipt of the PEC, the bq2060A compares the value to its calculation. If the PEC is correct, the bq2060A responds with an ACKNOWLEDGE. If it is not correct, the bq2060A responds with a NOT ACKNOWLEDGE and sets an error code. In the Read Word and Block Read, the host generates an ACKNOWLEDGE after the last byte of data sent by the bq2060A. The bq2060A then sends the PEC and the host acting as a master receiver generates a NOT ACKNOWLEDGE and a STOP condition. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 19 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com PEC Calculation The basis of the PEC calculation is an 8-bit Cyclic Redundancy Check (CRC-8) based on the polynomial C(X) = X8+X2+X1+1. The PEC calculation includes all bytes in the transmission, including address, command, and data. The PEC calculation does not include ACKNOWLEDGE, NOT ACKNOWLEDGE, START, STOP, and Repeated START bits. For example, the host requests RemainingCapacity() from the bq2060A. This includes the host following the Read Word protocol. The bq2060A calculates the PEC based on the following 5 bytes of data, assuming the remaining capacity of the battery is 1001 mAh. * Battery Address with R/W= 0: 0x16 * Command Code for RemainingCapacity(): 0x0f * Battery Address with R/W= 1: 0x17 * RemainingCapacity(): 0x03e9 For 0x160f17e903, the bq2060A transmits a PEC of 0xe8 to the host. PEC Enable in Master Mode PEC for master mode broadcasts to the charger, host, or both can be enabled/disabled with the combination of the bits HPE and CPE in Control Mode. SMBus On and Off State The bq2060A detects whether the SMBus enters the Off State by monitoring the SMBC and SMBD lines. When both signals are continually low for at least 2.5 s, the bq2060A detects the Off State. When the SMBC and SMBD lines go high, the bq2060A detects the On State and can begin communication within 1 ms. One-M pulldown resistors on SMBC and SMBD are recommended for reliable Off State detection. HDQ16 The HDQ16 interface is a command-based protocol. (See Figure 10.) A processor sends the command code to the bq2060A. The 8-bit command code consists of two fields, the 7-bit HDQ16 command code (bits 0-6) and the 1-bit R/W field. The R/W field directs the bq2060A either to * Store the next 16 bits of data to a specified register or * Output 16 bits of data from the specified register With HDQ16, the least significant bit of a data byte (command) or word (data) is transmitted first. A bit transmission consists of three distinct sections. The first section starts the transmission by either the host or the bq2060A taking the HDQ16 pin to a logic-low state for a period tSTRH;B. The next section is the actual data transmission, where the data bit is valid by the time, tDSU;B after the negative edge used to start communication. The data bit is held for a period tDH;DV to allow the host processor or bq2060A to sample the data bit. 20 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A II II II II II II II II II II II II II II IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII II II II II II II II II IIIIIIIIIIII IIIII IIIIIIIIIIIIIIIII IIIIII IIIIII IIIII IIIIIIIIIIIIIIIII II II II II www.ti.com 1 S 7 Battery Address 0001011 1 1 8 1 8 0 A Command Code A Data Byte Low Write Word 1 S 7 Battery Address 0001011 8 1 Data Byte Low A S 8 Byte Count = N 8 1 1 A Data Byte High A P 1 8 1 1 7 0 A Command Code A S Battery Address 8 1 1 1 A 1 Data Byte High 7 Battery Address 0001011 1 1 A P Read Word 1 II III II III II IIIIIIII III III III III SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 III III III III IIIII IIIII IIIII IIIII 1 1 8 1 1 7 0 A Command Code A S Battery Address 1 8 1 8 1 A Data Byte 1 A Data Byte 2 A Block Read Host Processor A - ACKNOWLEDGE bq2060A A - NOT ACKNOWLEDGE S - START P - STOP 1 1 1 A 8 1 1 Data Byte N A P Figure 8. SMBus Communication Protocol without PEC Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 21 bq2060A II II II II II II II II II II II II II II II II IIIIIIIIIIIIIIII IIIIII IIIII IIIII IIIIIIIIIIIIIIII IIIIIIIIIII IIIII II II II II II II II II IIIII IIIIIIIIII IIIII IIIII IIIII IIIII IIIIIIIIII IIIII IIIII IIIII II II II II SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 1 S 7 1 Battery Address 0 0001011 1 8 1 8 A Command Code A Data Byte Low Write Word 1 S 7 1 Battery Address 0 0001011 8 Data Byte Low S 8 Byte Count = N bq2060A A Data Byte High 8 1 1 7 1 1 A S Battery Address 1 A 8 A Data Byte High 1 8 A PEC 1 1 A P 1 8 1 1 A Command Code A S 1 1 Battery Address 1 A 8 1 8 1 A Data Byte 1 A Data Byte 2 A A- A- S- P- II II II II IIIII IIIII IIIII IIIII 7 1 II II II II II II II II Command Code Block Read Host Processor 8 1 1 7 1 Battery Address 0 0001011 1 A Read Word 1 II II II II 8 1 Data Byte N A II II II II www.ti.com 1 8 A PEC 1 A IIIII IIIII IIIII IIIII 8 1 1 PEC A P 1 P ACKNOWLEDGE NOT ACKNOWLEDGE START STOP Figure 9. SMBus Communication Protocol with PEC The final section is used to stop the transmission by returning the HDQ16 pin to a logic-high state by at least the time tSSU;B after the negative edge used to start communication. The final logic-high state should be until a period tCYCH;B to allow time to ensure that the bit transmission was stopped properly. If a communication error occurs (e.g., tCYCB > 250 s), the host sends the bq2060A a BREAK to reinitiate the serial interface. The bq2060A detects a BREAK when the HDQ16 pin is in a logic-low state for a time tB or greater. The HDQ16 pin is then returned to its normal ready-high logic state for a time tBR. The bq2060A is then ready to receive a command from the host processor. The HDQ16 pin is open drain and requires an external pullup resistor. Command Codes The SMBus Command Codes are in ( ), the HDQ16 in [ ]. Temperature(), Voltage(), Current(), and AverageCurrent(), performance specifications are at regulated VCC(VRO) and a temperature of 0-70C. ManufacturerAccess() (0x00); [0x00-0x01] Description: This function provides writable command codes to control the bq2060A during normal operation and pack manufacture. These commands can be ignored if sent within one second after a device reset. The following list of commands are available. 0x0618 Enable Low-Power Storage Mode: Activates the low-power storage mode. The bq2060A enters the storage mode after a 5-s to 8-s delay. The bq2060A accepts other commands to Manufacturer Access() during the delay before entering low-power storage mode. The LEDs must be off before entering the low-power storage mode as the display state remains unchanged. During the delay following the low-power storage command, a VFC Calibration command may be issued. 22 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com The bq2060A clears the ManufacturerAccess() command within 900 ms of acknowledging the Enable Low-Power Storage command. The VFC Calibration command may be sent 900-5000 ms after SMBus acknowledgment of the Enable Low-Power Storage command. In this case, the bq2060A delays entering storage mode until the calibration process completes and the bq2060A stores the new calibration values in EEPROM. 0x062b SEAL: Instructs the bq2060A to restrict access to those functions listed in Table 3. The bq2060A completes the seal function and clears ManufacturerAccess() within 900 ms of acknowledging the command. 0x064d Charge Synchronization: Instructs the bq2060A to update RM to a percentage of FCC as defined in Fast Charge Termination %. The bq2060A updates RM and clears Manufacturer Access() within 900 ms of acknowledging the command. 0x0653 Enable VFC Calibration: Instructs the unsealed bq2060A to begin VFC calibration. With this command, the bq2060A deselects the SR1 and SR2 inputs and calibrates for IC offset only. It is best to avoid charge or discharge currents through the sense resistor during this calibration process. 0x067e Alternate VFC Calibration: Instructs the unsealed bq2060A to begin VFC calibration. With this command, the bq2060A does not deselect the SR1 and SR2 inputs and does calibrate for IC and PCB offset. Any charge or discharge currents during this procedure result in an invalid VFC offset calibration and inaccurate VFC operation. During VFC calibration, the bq2060A disables the LED display and accepts only the Stop VFC Calibration and the SEAL commands to ManufacturerAccess(). The bq2060A disregards all other commands. SMBus communication should be kept to a minimum during VFC calibration to reduce the noise level and allow a more accurate calibration. Once started, the VFC calibration procedure completes automatically. When complete, the bq2060A saves the calibration values in EEPROM. The calibration normally takes about 8 to 10 minutes. The calibration time is inversely proportional to the bq2060A VFC (and PCB) offset error. The bq2060A caps the calibration time at one hour in the event of calibrating zero offset error. The VFC calibration can be done as the last step in a battery pack test procedure because the calibration can complete automatically after removal from a test setup. The bq2060A clears ManufacturerAccess() within 900 ms and starts calibration within 3.2 s of acknowledging the command. 0x0660 Stop VFC Calibration: Instructs the bq2060A to abort a VFC calibration procedure. If aborted, the bq2060A disables offset correction. The bq2060A stops calibration within 20 ms of acknowledging the command. 0x0606 Program EEPROM: Instructs the unsealed bq2060A to connect the SMBus to the EEPROM I2C bus. The bq2060A applies power to the EEPROM within 900 ms of acknowledging the command. After issuing the program EEPROM command, the bq2060A monitoring functions are disabled until the I2C bus is disconnected. The bq2060A disconnects the I2C bus when it detects that the battery address 0x16 is sent over the SMBus. The battery address 0x16 to disconnect the I2C bus should not be sent until 10 ms after the last write to the EEPROM. Send Host to bq2060A HDQ Command Code Break Send Host to bq2060A or Receive From bq2060A 16-Bit Data tRR R/W MSB Bit 7 LSB Bit 0 tRSPS Start-Bit Address-Bit/ Data-Bit Stop-Bit Figure 10. HDQ16 Communication Example Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 23 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Example:The following sequence of actions is an example of how to use the ManufacturerAccess() commands in an efficient manner to take a battery pack that has completed all testing and calibration except for VFC calibration and to make it ready for shipment in the SEALED state and in low-power storage mode: * Complete testing and calibration with desired final values stored in EEPROM. This process includes setting the SEAL bit in Pack Configuration. Sending a reset command to the bq2060A during test ensures that RAM values correspond to the final EEPROM values * If the initial value of RemainingCapacity() must be non-zero, the desired value may be written to Command 0x26 with the pack unsealed. A reset sent after this step resets RM to zero. * Issue the Enable Low-Power Storage Mode command. * Within 900 ms to 1600 ms after sending the Enable Low-Power command, issue the Enable VFC Calibration command. This delays the low-power storage mode until after VFC calibration completion. * Issue the SEAL Command subsequent to the VFC Calibration command. The bq2060A must receive the SEAL Command before VFC calibration completes. The bq2060A resets the OCE bit in Pack Status when calibration begins and sets the bit when calibration successfully completes. After VFC calibration completes automatically, the bq2060A saves the VFC offset cancellation values in EEPROM and enters the low-power storage mode in about 20 s. In addition, the bq2060A is sealed, allowing access as defined in Table 3 only. Purpose: The ManufacturerAccess() function provides the system host access to bq2060A functions that are not defined by the SBD. SMBus Protocol: Read or Write Word Input/Output: Word RemainingCapacityAlarm() (0x01); [0x01] Description: Sets or gets the low-capacity threshold value. Whenever the RemainingCapacity() falls below the low-capacity value, the bq2060A sends AlarmWarning() messages to the SMBus Host with the REMAINING_CAPACITY_ALARM bit set. A low-capacity value of 0 disables this alarm. The bq2060A initially sets the low-capacity value to Remaining Capacity Alarm value programmed in EE 0x04-0x05. The low-capacity value remains unchanged until altered by the RemainingCapacityAlarm() function. The low-capacity value may be expressed in either current (mA) or power (10 mWh) depending on the setting of the BatteryMode() CAPACITY_MODE bit. Purpose: The RemainingCapacityAlarm() function can be used by systems that know how much power they require to save their operating state. It enables those systems to more finely control the point at which they transition into suspend or hibernate state. The low-capacity value can be read to verify the value in use by the bq2060 low-capacity alarm. SMBus Protocol: Read or Write Word Input/Output: Unsigned integer--value below which Low Capacity messages are sent. BATTERY MODES CAPACITY_MODE BIT = 0 CAPACITY_MODE BIT = 1 Units mAh at C/5 10 mWh at P/5 Range 0-65,535 mAh 0-65,535 10 mWh Granularity Not applicable Accuracy See RemainingCapacity() RemainingTimeAlarm() (0x02); [0x02] Description: Sets or gets the remaining time alarm value. Whenever the AverageTimeToEmpty() falls below the remaining time value, the bq2060A sends AlarmWarning() messages to the SMBus Host with the REMAINING_TIME_ALARM bit set. A remaining time value of 0 effectively disables this alarm. The bq2060A initially sets the remaining time value to the Remaining Time Alarm value programmed in EE 0x02-0x03. The remaining time value remains unchanged until altered by the RemainingTimeAlarm() function. 24 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Purpose: The RemainingTimeAlarm() function can be used by systems that want to adjust when the remaining time alarm warning is sent. The remaining time value can be read to verify the value in use by the bq2060 RemainingTimeAlarm(). SMBus Protocol: Read or Write Word Input/Output: Unsigned integer--the point below which remaining time messages are sent. Units: minutes Range: 0 to 65,535 minutes Granularity: Not applicable Accuracy: see AverageTimeToEmpty() BatteryMode() (0x03); [0x03] Description: This function selects the various battery operational modes and reports the battery mode and requests. Defined modes include * Whether the battery capacity information is specified in mAh or 10 mWh (CAPACITY_MODE bit) * Whether the ChargingCurrent() and ChargingVoltage() values are broadcast to the Smart Battery Charger when the bq2060A detects that the battery requires charging (CHARGER_MODE bit) * Whether all broadcasts to the Smart Battery Charger and Host are disabled The defined request condition is the battery requesting a conditioning cycle (RELEARN_FLAG). Purpose: The CAPACITY_MODE bit allows power management systems to best match their electrical characteristics with those reported by the battery. For example, a switching power supply represents a constant power load, whereas a linear supply is better represented by a constant current model. The CHARGER_MODE bit allows a SMBus Host or Smart Battery Charger to override the Smart Battery desired charging parameters by disabling the bq2060 broadcasts. The RE-LEARN_FLAG bit allows the bq2060A to request a conditioning cycle. SMBus Protocol: Read or Write Word Input/Output: Unsigned integer--bit mapped (see the following). Units: not applicable Range: 0-1 Granularity: not applicable Accuracy: not applicable The BatteryMode() word is divided into two halves, the most significant bit (bits 8-15), which is read/write and the least significant bit (bits 0-7), which is read only. The bq2060A forces bits 0-6 to zero and prohibits writes to bit 7. Table 9 summarizes the meanings of the individual bits in the BatteryMode() word and specifies the default values, where applicable, are noted. INTERNAL_CHARGE_CONTROLLER bit is not used by the bq2060A. PRIMARY_BATTERY_SUPPORT bit is not used by the bq2060A. RELEARN_FLAG bit set indicates that the bq2060A is requesting a capacity relearn cycle for the battery. The bq2060A sets the RELEARN_FLAG under any of three conditions: full reset, detection of 20 cycle counts without an FCC update, or a midrange voltage correction. The bq2060A clears this flag after a learning cycle has been completed. CHARGE_CONTROLLER_ENABLED bit is not used by the bq2060A. The bq2060A forces this bit to zero. PRIMARY_BATTERY bit is not used by the bq2060A. The bq2060A forces this bit to zero. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 25 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Table 9. Battery Mode Bits and Values Battery Mode() Bits Bits Used Format INTERNAL_CHARGE_CONTROLLER 0 Read only bit flag Allowable Values PRIMARY_BATTERY_SUPPORT 1 Read only bit flag Reserved 2-6 RELEARN_FLAG 7 Read only bit flag CHARGE_CONTROLLER_ENABLED 8 R/W bit flag PRIMARY_BATTERY 9 R/W bit flag Reserved 10-12 ALARM_MODE 13 R/W bit flag 0--Enable alarm broadcast (default) 1--Disable alarm broadcast CHARGER_MODE 14 R/W bit flag 0--Enable charging broadcast (default) 1--Disable charging broadcast CAPACITY_MODE 15 R/W bit flag 0--Report in mA or mAh (default) 1--Report in 10 mW or 10 mWh 0--Battery OK 1--Relearn cycle requested ALARM_MODE bit is set to disable the bq2060 ability to master the SMBus and send AlarmWarning() messages to the SMBus Host and the Smart Battery Charger. When set, the bq2060A does NOT master the SMBus, and AlarmWarning() messages are NOT sent to the SMBus Host and the Smart Battery Charger for a period of no more than 65 s and no less than 45 s. When cleared (default), the Smart Battery sends the AlarmWarning() messages to the SMBus Host and the Smart Battery Charger any time an alarm condition is detected. * The bq2060A polls the ALARM_MODE bit at least every 150 ms. Whenever the ALARM_MODE bit is set, the bq2060A resets the bit and starts or restarts a 55-s (nominal) timer. After the timer expires, the bq2060A automatically enables alarm broadcasts to ensure that the accidental deactivation of broadcasts does not persist. To prevent the bq2060A from becoming a master on the SMBus, an SMBus host must therefore continually set this bit at least once per 50 s to keep the bq2060A from broadcasting alarms. * The ALARM_MODE bit defaults to a cleared state within 130 ms after the bq2060A detects the SMBus Off-State. * The condition of the ALARM-MODE bit does NOT affect the operation or state of the CHARGER_MODE bit which is used to prevent broadcasts of ChargingCurrent() and ChargingVoltage() to the Smart Battery Charger. CHARGER_MODE bit enables or disables the bq2060 transmission of ChargingCurrent() and ChargingVoltage() messages to the Smart Battery Charger. When set, the bq2060A does NOT transmit ChargingCurrent() and ChargingVoltage() values to the Smart Battery Charger. When cleared, the bq2060A transmits the ChargingCurrent() and ChargingVoltage() values to the Smart Battery Charger. The CHARGER_MODE bit defaults to a cleared state within 130 ms after the bq2060A detects the SMBus Off-State. CAPACITY_MODE bit indicates if capacity information is reported in mA/mAh or 10 mW/10 mWh. When set, the bq2060A reports capacity information in 10 mW/10 mWh as appropriate. When cleared, the bq2060A reports capacity information in mA/mAh as appropriate. The CAPACITY_MODE bit defaults to a cleared state within 130 ms after the bq2060A detects the SMBus Off-State. Note 1: The following functions are changed to accept or return values in mA/mAh or 10 mW/10 mWh depending on the CAPACITY_MODE bit: * RemainingCapacityAlarm() * AtRate() * RemainingCapacity() * FullChargeCapacity() * DesignCapacity() Note 2: The following functions are calculated on the basis of capacity and may be calculated differently depending on the CAPACITY_MODE bit: * AtRateOK() * AtRateTimeToEmpty() * AtRateTimeToFull() 26 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com * * * * * RunTimeToEmpty() AverageTimeToEmpty() AverageTimeToFull() Remaining Time Alarm() BatteryStatus() The bq2060A updates the non-AtRate related register values within 3 s of changing the state of the CAPACITY_MODE bit. The AtRate() values are updated after the next AtRate value is written to the bq2060A (or after the next 20 s scheduled refresh calculation). AtRate() (0x04); [0x04] Description: The AtRate() function is the first half of a two-function call-set used to set the AtRate value used in calculations made by the AtRateTimeToFull(), AtRateTimeToEmpty(), and AtRateOK() functions. The AtRate value may be expressed in either current (mA) or power (10 mW) depending on the setting of the BatteryMode() CAPACITY_MODE bit. Purpose: because the AtRate() function is the first half of a two-function call-set, it is followed by the second function of the call-set that calculates and returns a value based on the AtRate value and the present battery state. A delay of up to 1.3 s is required after writing AtRate() before the bq2060A can acknowledge the requested AtRate function. * When the AtRate() value is positive, the AtRateTimeToFull() function returns the predicted time to full charge at the AtRate value of charge. * When the AtRate() value is negative, the AtRateTimeToEmpty() function returns the predicted operating time at the AtRate value of discharge. * When the AtRate() value is negative, the AtRateOK() function returns a Boolean value that predicts the ability of the battery to supply the AtRate value of additional discharge energy (current or power) for 10 seconds. The default value for AtRate() is zero. Writing AtRate() values over the HDQ16 serial port does NOT trigger a re-calculation of AtRateTimeToFull(), AtRateTimeToEmpty(), and AtRateOK() functions. It is recommended that AtRate() requests should be limited to one request every 4 s. SMBus Protocol: Read or Write Word Input/Output: Signed integer--charge or discharge; the AtRate() value is positive for charge, negative for discharge, and zero for neither (default). BATTERY MODE CAPACITY_MODE BIT = 0 CAPACITY_MODE BIT = 1 Units mA 10 mW Charge Range 1-32,767 mA 1-32,768 10 mW Discharge Range -1 to -32,768 mA -1 to -32,768 10 mW Granularity 1 unit Accuracy NA AtRateTimeToFull() (0x05);[0x05] Description: Returns the predicted remaining time to fully charge the battery at the AtRate( ) value (mA). Purpose: The AtRateTimeToFull() function is part of a two-function call-set used to determine the predicted remaining charge time at the AtRate value in mA. The bq2060A updates AtRateTimeToFull() within 1.3 s after the SMBus Host sets the AtRate value. If read before this delay, the command is No Acknowledged and the error code in BatteryStatus is set to not ready. The bq2060A automatically updates AtRateTimeToFull() based on the AtRate() value every 20 s. SMBus Protocol: Read Word Output: Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 27 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Unsigned integer--predicted time in minutes to fully charge the battery. * Units: minutes * Range: 0 to 65,534 min * Granularity: 2 min or better * Accuracy: MaxError() * FullChargeCapacity() / |AtRate()| * Invalid Data Indication: 65,535 indicates the battery is not being charged. AtRateTimeToEmpty() (0x06); [0x06] Description: Returns the predicted remaining operating time if the battery is discharged at the AtRate() value. Purpose: The AtRateTimeToEmpty() function is part of a two-function call-set used to determine the remaining operating time at the AtRate() value. The bq2060A updates AtRateTimeToEmpty() within 1.3 s after the SMBus Host sets the AtRate() value. If read before this delay, the command is No Acknowledged, and the error code in BatteryStatus is set to not ready. The bq2060A automatically updates AtRateTimeToEmpty() based on the AtRate() value every 20 s. SMBus Protocol: Read Word Output: Unsigned integer -- estimated operating time left. * Units: minutes * Range: 0 to 65,534 min * Granularity: 2 min or better * Accuracy: -0,+MaxError()*FullChargeCapacity/|AtRate()| * Invalid Data Indication: 65,535 indicates the battery is not being discharged. AtRateOK() (0x07); [0x07] Description: Returns a Boolean value that indicates whether or not the battery can deliver the AtRate( ) value of additional energy for 10 seconds (Boolean). If the AtRate value is zero or positive, the AtRateOK() function always returns true. Purpose:The AtRateOK() function is part of a two-function call-set used by power management systems to determine if the battery can safely supply enough energy for an additional load. The bq2060A updates AtRateOK() within 1.3 s after the SMBus Host sets the AtRate( ) value. If read before this delay, the command is No Acknowledged, and the error code in BatteryStatus is set to not ready. The bq2060A automatically updates AtRateOK() based on the At Rate() value every 20 s. SMBus Protocol: Read Word Output: Boolean--indicates if the battery can supply the additional energy requested. * Units: Boolean * Range: TRUE, FALSE * Granularity: not applicable * Accuracy: not applicable Temperature() (0x08); [0x08] Description: Returns the temperature (K) measured by the bq2060A. Purpose: The Temperature() function provides accurate cell temperatures for use by battery chargers and thermal management systems. A battery charger can use the temperature as a safety check. Thermal management systems may use the temperature because the battery is one of the largest thermal sources in a system. SMBus Protocol: Read Word Output: 28 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Unsigned integer--cell temperature in tenth-degree Kelvin increments. * Units: 0.1K * Range: 240.4K to 388.0K * Granularity: 0.1K * Accuracy: 1.5K (from ideal 103AT thermistor performance, after calibration from 0K to 70K) Voltage() (0x09); [0x09] Description: Returns the cell-pack voltage (mV). Purpose: The Voltage() function provides power management systems with an accurate battery terminal voltage. Power management systems can use this voltage, along with battery current information, to characterize devices they control. This ability helps enable intelligent, adaptive power management systems. SMBus Protocol: Read Word Output: Unsigned integer--battery terminal voltage in mV. * Units: mV * Range: 0 to 20,000 mV * Granularity: 1 mV * Accuracy: 0.65% (after calibration) Current() (0x0a); [0x0a] Description: Returns the current being supplied (or accepted) through the battery terminals (mA). Purpose: The Current() function provides a snapshot for the power management system of the current flowing into or out of the battery. This information is of particular use in power management systems because they can characterize individual devices and tune their operation to actual system power behavior. SMBus Protocol: Read Word Output: Signed integer--charge/discharge rate in mA increments--positive for charge, negative for discharge. * Units: mA * Range: ( 250 mV/RS) mA * Granularity: 0.038 mV/RS (integer value) * Accuracy: 1 mV/RS (after calibration) AverageCurrent() (0x0b); [0x0b] Description: Returns a value that approximates a one-minute rolling average of the current being supplied (or accepted) through the battery terminals (mA). The AverageCurrent() function returns meaningful values during the first minute of battery operation. Purpose: The AverageCurrent() function provides the average current flowing into or out of the battery for the power management system. SMBus Protocol: Read Word Output: Signed integer--charge/discharge rate in mA increments--positive for charge, negative for discharge. * Units: mA * Range: ( 250 mV/RS) mA * Granularity: 0.038 mV/RS (integer value) * Accuracy: 1 mV/RS (after calibration) Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 29 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com MaxError() (0x0c); [0x0c] Description: Returns the expected margin of error (%) in the state of charge calculation. For example, when MaxError() returns 10% and RelativeStateOfCharge() returns 50%, the Relative StateOfCharge() is more likely between 50% and 60%. The bq2060A sets MaxError() to 100% on a full reset. The bq2060A sets MaxError() to 2% on completion of a learning cycle, unless the bq2060A limits the learning cycle to the +512/-256-mAh maximum adjustment values. If the learning cycle is limited, the bq2060A sets MaxError() to 8% unless MaxError() was already below 8%. In this case MaxError() does not change. The bq2060A increments MaxError() by 1% after four increments of CycleCount() without a learning cycle. If voltage-based corrections are applied to the coulomb counter, MaxError() is set to 25%. Purpose: The MaxError() function has real value in two ways: first, to give the user a confidence level about the state of charge and second, to give the power management system information about how aggressive it should be, particularly as the battery nears the end of its life. SMBus Protocol: Read Word Output: Unsigned integer--percent uncertainty for selected information. * Units: % * Range: 2% to 100% * Granularity: 1% * Accuracy: not applicable RelativeStateOfCharge() (0x0d); [0x0d] Description: Returns the FullChargeCapacity() (%). predicted remaining battery capacity expressed as a percentage of Purpose: The RelativeStateOfCharge() function is used to estimate the amount of charge remaining in the battery relative to the last learned capacity. SMBus Protocol: Read Word Output: Unsigned integer--percent of remaining capacity. * Units: % * Range: 0% to 100% * Granularity: 1% * Accuracy: -0, +MaxError() AbsoluteStateOfCharge()(0x0e); [0x0e] Description: Returns the predicted remaining battery capacity expressed as a percentage of DesignCapacity() (%). Note that AbsoluteStateOfCharge() can return values greater than 100%. Purpose: The AbsoluteStateOfCharge() function is used to estimate the amount of charge remaining in the battery relative to the nominal or DesignCapacity(). SMBus Protocol: Read Word Output: RemainingCapacity() (0x0f); [0x0f] Description: Returns the predicted charge or energy remaining in the battery. The RemainingCapacity() value is expressed in either charge (mAh at a C/5 discharge rate) or energy (10 mWh at a P/5 discharge rate) depending on the setting of the BatteryMode() CAPACITY_MODE bit. Purpose: The RemainingCapacity() function returns the remaining battery capacity. This information is a numeric indication of remaining charge or energy given by the Absolute or Relative StateOfCharge() functions and may be in a better form for use by power management systems. 30 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com SMBus Protocol: Read Word Output: Unsigned integer--remaining charge in mAh or 10 mWh. BATTERY MODE CAPACITY_MODE BIT = 0 CAPACITY_MODE BIT = 1 Units mAh 10 mWh Range 0-65,535 mAh 0-65, 535 10 mWh Granularity mAh 10 mWh Accuracy -0, +MaxError()*FullChargeCapacity() FullChargeCapacity() (0x10); [0x10] Description: Returns the predicted pack capacity when it is fully charged. The FullChargeCapacity() value is expressed in either current (mAh at a C/5 discharge rate) or power (10 mWh at a P/5 discharge rate) depending on the setting of the BatteryMode() CAPACITY_MODE bit. Purpose: The FullChargeCapacity() function provides the user with a means of understanding the tank size of their battery. This information, along with information about the original capacity of the battery, can be presented to the user as an indication of battery wear. SMBus Protocol: Read Word Output: Unsigned integer--estimated full-charge capacity in mAh or 10 mWh. BATTERY MODE CAPACITY_MODE BIT = 0 CAPACITY_MODE BIT = 1 Units mAh 10 mWh Range 0-65,535 mAh 0-65,535 10 mWh Granularity mAh 10 mWh Accuracy -0, +MaxError()*FullChargeCapacity() RunTimeToEmpty() (0x11); [0x11] Description: Returns the predicted remaining battery life at the present rate of discharge (minutes). The RunTimeToEmpty() value is calculated based on either current or power depending on the setting of the BatteryMode() CAPACITY_MODE bit. Purpose: The RunTimeToEmpty() provides the power management system with information about the relative gain or loss in remaining battery life in response to a change in power policy. This information is NOT the same as the AverageTimeToEmpty(), which is not suitable to determine the effects that result from a change in power policy. SMBus Protocol: Read Word Output: Unsigned integer--minutes of operation left. * Units: minutes * Range: 0 to 65,534 min * Granularity: 2 min or better * Accuracy: -0, +MaxError()*FullChargeCapacity() / Current() * Invalid Data Indication: 65,535 indicates battery is not being discharged. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 31 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com AverageTimeToEmpty() (0x12); [0x12] Description: Returns a 1-minute rolling average of the predicted remaining battery life (minutes). The AverageTimeToEmpty() value is calculated based on either current or power depending on the setting of the BatteryMode() CAPACITY_MODE bit. Purpose: The AverageTimeToEmpty() displays state-of-charge information in a more useful way. It averages the instantaneous estimations so that the remaining time does not appear to jump around. SMBus Protocol: Read Word Output: Unsigned integer--minutes of operation left. * Units: minutes * Range: 0 to 65,534 min * Granularity: 2 min or better * Accuracy: -0, +MaxError()*FullChargeCapacity() / AverageCurrent() * Invalid Data Indication: 65,535 indicates battery is not being discharged. AverageTimeToFull() (0x13); [0x13] Description: Returns a 1-minute rolling average of the predicted remaining time until the battery reaches full charge (minutes). Purpose: The AverageTimeToFull() function can be used by the SMBus host power-management system to aid in its policy. It may also be used to find out how long the system must be left on to achieve full charge. SMBus Protocol: Read Word Output: Unsigned integer--remaining time in minutes. * Units: minutes * Range: 0 to 65,534 minutes * Granularity: 2 minutes or better * Accuracy: MaxError()*FullChargeCapacity() / AverageCurrent() * Invalid Data Indication: 65,535 indicates the battery is not being charged ChargingCurrent() (0x14); [0x14] Description: Returns the desired charging rate in mA. Purpose: The ChargingCurrent() function sets the maximum charge current of the battery. The ChargingCurrent() value should be used in combination with the ChargingVoltage() value to set the charger operating point. Together, these functions permit the bq2060A to dynamically control the charging profile (current/voltage) of the battery. The bq2060A can effectively turn off a charger by returning a value of 0 for this function. The charger may be operated as a constant-voltage source above its maximum regulated current range by returning a ChargingCurrent() value of 65,535. SMBus Protocol: Read Word Output: Unsigned integer--maximum charger output current in mA. * Units: mA * Range: 0 mA to 65,535 mA * Granularity: 1 mA * Accuracy: not applicable * Invalid Data Indication: 65,535 indicates that a charger should operate as a voltage source outside its maximum regulated current range. 32 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com ChargingVoltage() (0x15); [0x15] Description: Returns the desired charging voltage in mV. Purpose: The ChargingVoltage() function sets the maximum charge voltage of the battery. The ChargingVoltage() value should be used in combination with the ChargingCurrent() value to set the charger operating point. Together, these functions permit the bq2060A to dynamically control the charging profile (current/voltage) of the battery. The charger may be operated as a constant-current source above its maximum regulated voltage range by returning a ChargingVoltage() value of 65,535. SMBus Protocol: Write Word Output: Unsigned integer--charger output voltage in mV. * Units: mV * Range: 0 mV to 65,535 mV * Granularity: 1 mV * Accuracy: not applicable * Invalid Data Indication: 65,535 indicates that the charger should operate as a current source outside its maximum regulated voltage range. BatteryStatus()(0x16); [0x16] Description: Returns the bq2060 status word (flags). Some of the BatteryStatus() flags (REMAINING_CAPACITY_ALARM and REMAINING_TIME_ALARM) are calculated based on either current or power depending on the setting of the BatteryMode() CAPACITY_MODE bit. This is important because use of the wrong calculation mode may result in an inaccurate alarm. Purpose: The BatteryStatus() function is used by the power management system to get alarm and status bits, as well as error codes from the bq2060A. This is basically the same information broadcast to both the SMBus Host and the Smart Battery Charger by the AlarmWarning() function except that the AlarmWarning() function sets the Error Code bits all high before sending the data. SMBus Protocol: Read Word Input/Output: Unsigned integer--Status Register with alarm conditions bit-mapped as follows: ALARM BITS 0x8000 OVER_CHARGED_ALARM 0x4000 TERMINATE_CHARGE_ALARM 0x2000 Reserved 0x1000 OVER_TEMP_ALARM 0x0800 TERMINATE_DISCHARGE_ALARM 0x0400 Reserved 0x0200 REMAINING_CAPACITY_ALARM 0x0100 REMAINING_TIME_ALARM STATUS BITS 0x0080 INITIALIZED 0x0040 DISCHARGING 0x0020 FULLY_CHARGED 0x0010 FULLY_DISCHARGED ERROR CODES 0x0007 Unknown Error 0x0006 BadSize 0x0005 Overflow/Underflow Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 33 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com ERROR CODES 0x0004 AccessDenied 0x0003 UnsupportedCommand 0x0002 ReservedCommand 0x0001 Busy 0x0000 OK Alarm Bits OVER_CHARGED_ALARM bit is set whenever the bq2060A detects that the battery is being charged beyond the Maximum Overcharge limit. This bit is cleared when the bq2060A detects that the battery is no longer being charged (i.e., the bq2060A detects discharge activity or no activity for the digital filter timeout periods). The digital filter timeout period (seconds) equates to 10 times the value shared in Digital Filter EE0x52. TERMINATE_CHARGE_ALARM bit is set when the bq2060A detects that one or more of the battery charging parameters are out of range (e.g., its voltage, current, or temperature is too high) or when the bq2060A detects a primary charge termination. This bit is cleared when the parameter falls back into the allowable range, the termination condition ceases, or when the bq2060A detects that the battery is no longer being charged. OVER_TEMP_ALARM bit is set when the bq2060A detects that the internal battery temperature is greater than or equal to the MaxT limit. This bit is cleared when the internal temperature falls back into the acceptable range. TERMINATE_DISCHARGE_ALARM bit is set when the bq2060A detects Voltage() EDV0, the CVUV bit in Pack Status is set (Li-ion cell voltage has dropped below the limit programmed in Cell Under / Over Voltage), or RemainingCapacity() = 0. The bit is cleared when Voltage() > EDV0 or CVUV bit is cleared, and RemainingCapacity() > 0. REMAINING_CAPACITY_ALARM bit is set when the bq2060A detects that RemainingCapacity() is less than that set by the RemainingCapacityAlarm() function. This bit is cleared when the value set by the RemainingCapacityAlarm() function is lower than RemainingCapacity(). REMAINING_TIME_ALARM bit is set when the bq2060A detects that the estimated remaining time at the present discharge rate is less than that set by the RemainingTimeAlarm() function. This bit is cleared when the value set by the RemainingTimeAlarm() function is lower than the AverageTimeToEmpty(). Status Bits INITIALIZED bit is set when the bq2060A has detected a valid load of EEPROM. It is cleared when the bq2060A detects an improper EEPROM load. DISCHARGING bit is set when the bq2060A determines that the battery is not being charged. This bit is cleared when the bq2060A detects that the battery is being charged. FULLY_CHARGED bit is set when the bq2060A detects a primary charge termination or an overcharged condition. It is cleared when RelativeStateOfCharge() the programmed Fully Charged Clear % in EE 0x4c. FULLY_DISCHARGED bit is set when Voltage() EDV2 threshold, or RemainingCapacity() < Full Charge Capacity*BatteryLow%. This bit is cleared when the Relative StateOfCharge() is 20%. ERROR CODES OK Busy Reserved Unsupported DESCRIPTION The bq2060A processed the function code without detecting any errors. The bq2060A is unable to process the function code at this time. The bq2060A detected an attempt to read or write to a function code reserved by this version of the specification. The bq2060A detected an attempt to access an unsupported optional manufacturer function code. The bq2060A does not support this function code which is defined in this version of the specification. AccessDenied The bq2060A detected an attempt to write to a read-only function code. Over/Underflow The bq2060A detected a data overflow or underflow. BadSize UnknownError 34 The bq2060A detected an attempt to write to a function code with an incorrect data block. The bq2060A detected an unidentifiable error. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com CycleCount()(0x17); [0x17] Description: Returns the number of cycles the battery has experienced. The mAh value of each count is determined by programming the Cycle Count Threshold value in EE 0x3c-0x3d. The bq2060A saves the cycle count value to Cycle Count EE 0x0e-0x0f after an update to CycleCount(). Purpose: The CycleCount() function provides a means to determine the battery wear. It may be used to give advanced warning that the battery is nearing its end of life. SMBus Protocol: Read Word Output: Unsigned integer--count of total charge removed from the battery over its life. * Units: cycle * Range: 0 to 65,534 cycles 65,535 indicates battery has experienced 65,535 or more cycles. * Granularity: 1 cycle * Accuracy: absolute count DesignCapacity() (0x18); [0x18] Description: Returns the theoretical or nominal capacity of a new pack. The DesignCapacity() value is expressed in either current (mAh at a C/5 discharge rate) or power, (10 mWh at a P/5 discharge rate) depending on the setting of the BatteryMode() CAPACITY_MODE bit. Purpose: The DesignCapacity() function is used by the SMBus host power management with FullChargeCapacity() to determine battery wear. The power management system may present this information to the user and also adjust its power policy as a result. SMBus Protocol: Read Word Output: Unsigned integer--battery capacity in mAh or 10 mWh. BATTERY MODE CAPACITY_MODE BIT = 0 CAPACITY_MODE BIT = 1 Units mAh 10 mWh Range 0-65,535 mAh 0-65,535 10 mWh Granularity Not applicable Accuracy Not applicable DesignVoltage() (0x19); [0x19] Description: Returns the theoretical voltage of a new pack (mV). The bq2060A sets DesignVoltage() to the value programmed in Design Voltage EE0x12-0x13. Purpose: The DesignVoltage() function can be used to give additional information about a particular Smart Battery's expected terminal voltage. SMBus Protocol: Read Word Output: Unsigned integer--the battery's designed terminal voltage in mV * Units: mV * Range: 0 mV to 65,535 mV * Granularity: not applicable * Accuracy: not applicable Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 35 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com SpecificationInfo() (0x1a); [0x1a] Description: Returns the version number of the Smart Battery specification that the battery pack supports, as well as voltage and current scaling information in a packed unsigned integer. Power scaling is the product of the voltage scaling times the current scaling. The SpecificationInfo is packed in the following fashion: * (SpecID_H *0x10+SpecID_L)+(VScale+IPScale*0x10)*0x100 The bq2060A VScale (voltage scaling) and IPScale (current scaling) should always be set to zero. The bq2060A sets SpecificationInfo() to the value programmed in Specification Information EE 0x14-0x15. Purpose: The SpecificationInfo() function is used by the SMBus host power-management system to determine what information the Smart Battery can provide. SMBus Protocol: Read Word Output: Unsigned integer--packed specification number and scaling information. FIELD BITS USED FORMAT ALLOWABLE VALUES 0-15 SpecID_L 0...3 4-bit binary value SpecID_H 4...7 4-bit binary value 0-15 VScale 8...11 4-bit binary value 0 (multiplies voltage by 10VScale) IPScale 12...15 4-bit binary value 0 (multiplies current by 10IPScale) ManufactureDate() (0x1b); [0x1b] Description: This function returns the date the cell pack was manufactured in a packed integer. The date is packed in the following fashion: (year - 1980) x 512 + month x 32 + day. The bq2060A sets ManufactureDate() to the value programmed in Manufacture Date EE 0x16-0x17. Purpose: The ManufactureDate() provides the system with information that can be used to uniquely identify a particular battery pack when used with SerialNumber(). SMBus Protocol: Read Word Output: Unsigned integer--packed date of manufacture. FIELD BITS USED FORMAT ALLOWABLE VALUES Day 0...4 5-bit binary value 0-31 (corresponds to date) Month 5...8 4-bit binary value 1-12 (corresponds to month number) Year 9...15 7-bit binary value 0-127 (corresponds to year biased by 1980) SerialNumber() (0x1c); [0x1c] Description: This function is used to return a serial number. This number, when combined with the ManufacturerName(), the DeviceName(), and the ManufactureDate(), uniquely identifies the battery (unsigned integer). The bq2060A sets SerialNumber() to the value programmed in Serial Number EE 0x18-0x19. Purpose: The SerialNumber() function can be used to identify a particular battery. This may be important in systems that are powered by multiple batteries where the system can log information about each battery that it encounters. SMBus Protocol: Read Word Output: Unsigned integer 36 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com ManufacturerName() (0x20); [0x20-0x2a] Description: This function returns a character array containing the battery manufacturer's name. For example, MyBattCo would identify the Smart Battery manufacturer as MyBattCo. The bq2060A sets ManufacturerName() to the value programmed in Manufacturer Name EE 0x20-0x2a. Purpose: The ManufacturerName() function returns the name of the Smart Battery manufacturer. The manufacturer's name can be displayed by the SMBus host power-management system display as both an identifier and as an advertisement for the manufacturer. The name is also useful as part of the information required to uniquely identify a battery. SMBus Protocol: Read Block Output: String--character string with maximum length of 10 characters (10 + length byte). DeviceName() (0x21); [0x28-0x2b] Description: This function returns a character string that contains the battery name. For example, a DeviceName() of BQ2060A would indicate that the battery is a model BQ2060A. The bq2060A sets DeviceName() to the value programmed in Device Name EE 0x30-0x37. Purpose: The DeviceName() function returns the battery name for identification purposes. SMBus Protocol: Read Block Output: String--character string with maximum length of 10 characters (10+length byte). DeviceChemistry() (0x22); [0x30-0x32] Description:This function returns a character string that contains the battery chemistry. For example, if the DeviceChemistry() function returns NiMH, the battery pack would contain nickel metal hydride cells. The bq2060A sets DeviceChemistry() to the value programmed in Device Chemistry EE 0x40-0x44. Purpose: The DeviceChemistry() function gives cell chemistry information for use by charging systems. The bq2060A does not use DeviceChemisty() values for internal charge control or fuel gauging. SMBus Protocol: Read Block Output: String--character string with maximum length of 4 characters (4+length byte). Lead acid PbAc Lithium ion LION Nickel cadmium NiCd Nickel metal hydride NiMH Nickel zinc NiZn Rechargeable alkaline-manganese RAM Zinc air ZnAr ManufacturerData() (0x23); [0x38-0x3a] Description: This function allows access to the manufacturer data contained in the battery (data). The bq2060A stores seven critical operating parameters in this data area. Purpose: The ManufacturerData() function may be used to access the manufacturer's data area. The data fields of this command reflect the programming of five critical EEPROM locations and can be used to facilitate evaluation bq2060A under various programming sets. The ManufacturerData() function returns the following information in order: Control Mode, Digital Filter, Self-Discharge Rate, Battery Low %, Near Full, and the pending EDV threshold voltage (low byte and high byte.) SMBus Protocol: Read Block Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 37 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Output: Block data--data that reflects EEPROM programming as assigned by the manufacturer with maximum length of 7 characters (7+length byte). Pack Status and Pack Configuration (0x2f); [0x2f] This function returns the Pack Status and Pack Configuration registers. The Pack Status register contains a number of status bits relating to bq2060A operation. The Pack Status register is the least significant byte of the word. The Pack Configuration register is the most significant byte of the word. The byte reflects how the bq2060A is configured as defined by the value programmed in Pack Configuration in EE 0x3f. The Pack Status Register consists of the following bits: b7 b6 b5 b4 b3 b2 b1 b0 OCE EDV2 EINT VDQ COK DOK CVOV CVUV OCE The OCE bit indicates that offset cancellation is enabled. The bq2060A sets this bit after VFC offset calibration is complete. 0 Offset calibration is not enabled 1 Offset calibration is enabled EDV2 The EDV2 bit indicates that Voltage() is less than the EDV2 threshold. 0 Voltage() > EDV2 threshold (discharging) 1 Voltage() EDV2 threshold EINT The EINT bit indicates that the VFC has detected a charge or discharge pulse. 0 No charge/discharge activity detected 1 Charge/discharge activity detected. VDQ The VDQ bit indicates if the present discharge cycle is valid for an FCC update. 0 Discharge cycle is not valid 1 Discharge cycle is valid COK The COK bit indicates the status of the CFC pin of the bq2060A. 0 CFC pin is low 1 CFC pin is high DOK The DOK bit indicates the status of the DFC pin of the bq2060A. 0 38 DFC pin is low Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com 1 DFC pin is high CVOV The CVOV bit indicates that a secondary Li-ion protection limit has been exceeded. It is set if any individual cell exceeds the programmed high voltage limit, if the pack voltage exceeds the overvoltage threshold, or if an overtemperature condition occurs. The bit is not latched and merely reflects the present overvoltage status. 0 No secondary protection limits exceeded 1 A secondary protection limit exceeded CVUV The CVUV bit indicates if any individual cell falls below the programmed low-voltage limit. The bit applies to lithium batteries only. The bit is not latched and merely reflects the present undervoltage status. 0 All series cells are above the low-voltage limit 1 A series cell is below the low-voltage limit VCELL4-VCELL1 (0x3c-0x3f); [0x3c-0x3f] These functions return the calculated voltages in mV at the VCELL4 through VCELL1 inputs. EEPROM General The bq2060A accesses the external EEPROM during a full reset and when storing historical data. During an EEPROM access, the VOUT pin becomes active, and the bq2060A uses the ESCL and ESDA pins to communicate with the EEPROM. The EEPROM stores basic configuration information for use by the bq2060A. The EEPROM must be programmed correctly for proper bq2060A operation. CAUTION Recent changes to some EEPROM ICs have made the timing of the VOUT pin unreliable. It is strongly recommended that the EEPROM is powered from the VCC pin (pin 7). Also, it is acceptable to short pins 6 and 7, if needed. Memory Map Table 10 shows the memory map for the EEPROM. It also contains example data for a 10-series NiMH and a 3s3p Li-ion battery pack with a 0.05- sense resistor. EEPROM Programming The following sections describes the function of each EEPROM location and how the data is to be stored. Fundamental Parameters Sense Resistor Value Two factors are used to scale the current-related measurements. The 16-bit ADC Sense Resistor Gain value in EE 0x68-0x69 scales Current() to mA. Adjusting ADC Sense Resistor Gain from its nominal value provides a method to calibrate the current readings for system errors and the sense resistor value (R)S) The nominal value is set by ADC Sense Resistor Gain + 625 (R s) (4) Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 39 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com The 16-bit VFC Sense Resistor Gain in EE 0x6a-0x6b scales each VFC interrupt to mAh. VFC Sense Resistor Gain is based on the resistance of the series sense resistor. The following formula computes a nominal or starting value for VFC Sense Resistor Gain from the sense resistor value. VFC Sense Resistor Gain + 409.6 (Rs) (5) Sense resistor values are limited to the range of 0.00954 to 0.100 . Digital Filter The digital filter threshold, VDF (V), is set by the value stored in Digital Filter EE 0x52. Digital Filter + 2250 VDF (6) Cell Characteristics Battery Pack Capacity and Voltage Pack capacity in mAh units is stored in Pack Capacity EE 0x3a-0x3b. In mAh mode, the bq2060A copies Pack Capacity to DesignCapacity(). In mWh mode, the bq2060A multiplies Pack Capacity by Design Voltage EE 0x12-0x13 to calculate DesignCapacity() scaled to 10 mWh. Design Voltage is stored in mV. The initial value for Last Measured Discharge in mAh is stored in EE 0x38-0x39. Last Measured Discharge is modified over the course of pack usage to reflect cell aging under the particular use conditions. The bq2060A updates Last Measured Discharge in mAh after a capacity learning cycle. The bq2060A uses the Last Measured Discharge value to calculate FullChargeCapacity() in mAh or 10 mWh mode. Table 10. EEPROM Memory Map EEPROM Address Name Chemistry NiMH Example Data MSB LSB Li-Ion Example Data MSB LSB 0x00 0x01 Check Byte 1 Li-Ion, nickel 15487 3c 7f 15487 3c 7f 0x02 0x03 Remaining Time Alarm Li-Ion, nickel 10 minutes 00 0a 10 minutes 00 0a 0x04 0x05 Remaining Capacity Alarm Li-Ion, nickel 350 mAh 01 5e 400 mAh 01 90 0x06 EDV A0 Impedance Age Factor Li-Ion, nickel 0 -- 00 0 -- 00 0x07 EDV TC Cold Impedance Factor -- 0 -- 00 3 -- 03 0x08 Misc Options -- 0 -- 00 0 -- 00 -- 0 -- 00 0 -- 00 Li-Ion, nickel 18000 mV 46 50 12600 mV 31 38 -- 128 00 80 128 00 80 Li-Ion, nickel 0 00 00 0 00 00 -- 0 00 00 0 00 00 Li-Ion, nickel 12000 mV 2e e0 10800 mV 2a 30 Li-Ion, nickel v1.1/PEC 00 31 v1.1/PEC 00 31 Manufacture Date Li-Ion, nickel 2/25/99=9817 26 59 2/25/99=9817 26 59 Serial Number Li-Ion, nickel 1 00 01 1 00 01 0x1b Fast-Charging Current Li-Ion, nickel 4000 mA 0f a0 3000 mA 0b b8 0x1c 0x1d Maintenance Charging Current Li-Ion, nickel 200 mA 00 c8 0 mA 00 00 0x1e 0x1f Pre-Charge Current Li-Ion, nickel 800 mA 03 20 100 mA 00 64 0x20 Manufacturer Name Length Li-Ion, nickel 9 -- 09 9 -- 09 0x21 Character 1 Li-Ion, nickel B -- 42 B -- 42 0x22 Character 2 Li-Ion, nickel E -- 45 E -- 45 0x23 Character 3 Li-Ion, nickel N -- 4e N -- 4e 0x24 Character 4 Li-Ion, nickel C -- 43 C -- 43 0x25 Character 5 Li-Ion, nickel H -- 48 H -- 48 0x09 Safety Overtemperature 0x0a 0x0b Charging Voltage 0x0c 0x0d Reserved 0x0e 0x0f Cycle Count 0x10 0x11 Reserved 0x12 0x13 Design Voltage 0x14 0x15 Specification Information 0x16 0x17 0x18 0x19 0x1a 40 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Table 10. EEPROM Memory Map (continued) EEPROM Address Name Data Data Chemistry NiMH Example MSB LSB Li-Ion Example MSB LSB 0x26 Character 6 Li-Ion, nickel M -- 4d M -- 4d 0x27 Character 7 Li-Ion, nickel A -- 41 A -- 41 0x28 Character 8 Li-Ion, nickel R -- 52 R -- 52 0x29 Character 9 Li-Ion, nickel Q -- 51 Q -- 51 0x2a Character 10 Li-Ion, nickel 0 -- 00 0 -- 00 0x2b Light Discharge Current Li-Ion, nickel 0 -- 00 0 -- 00 0x2c 0x2d Reserved -- 0 00 00 0 00 00 0x2e 0x2f Maximum Overcharge Li-Ion, nickel 200 mAh ff 38 256 mAh ff 00 0x30 Device Name Length Li-Ion, nickel 7 -- 07 7 -- 07 0x31 Character 1 Li-Ion, nickel B -- 42 B -- 42 0x32 Character 2 Li-Ion, nickel Q -- 51 Q -- 51 0x33 Character 3 Li-Ion, nickel 2 -- 32 2 -- 32 0x34 Character 4 Li-Ion, nickel 0 -- 30 0 -- 30 0x35 Character 5 Li-Ion, nickel 6 -- 36 6 -- 36 0x36 Character 6 Li-Ion, nickel 0 -- 30 0 -- 30 0x37 Character 7 Li-Ion, nickel A -- 41 A -- 41 0x38 0x39 Last Measured Discharge Li-Ion, nickel 4000 mAh 0f a0 4050 mAh 0f d2 0x3a 0x3b Pack Capacity Li-Ion, nickel 4000 mAh 0f a0 4050 mAh 0f d2 0x3c 0x3d Cycle Count Threshold Li-Ion, nickel 500 mAh fe 0c 3240 mAh f3 58 -- 0 -- 00 0 -- 00 0x3e Reserved 0x3f Pack Configuration Li-Ion, nickel 232 -- e8 246 -- f6 0x40 Device Chemistry Length Li-Ion, nickel 4 -- 04 4 -- 04 0x41 Character 1 Li-Ion, nickel N -- 4e L -- 4c 0x42 Character 2 Li-Ion, nickel I -- 49 I -- 49 0x43 Character 3 Li-Ion, nickel M -- 4d O -- 4f 0x44 Character 4 Li-Ion, nickel H -- 48 N -- 4e MaxT DeltaT Li-Ion, nickel 50C, 3C -- c7 50C, 4.6C -- cf Overload Current Li-Ion, nickel 6000 mA 17 70 6000 mA 17 70 0x48 Overvoltage Margin Li-Ion, nickel 0 -- 00 800 mV -- 32 0x49 Overcurrent Margin Li-Ion, nickel 512 mA -- 20 512 mA -- 20 0x45 0x46 0x47 0x4a Reserved Nickel 0 -- 00 -- -- -- Cell Under/Over Voltage Li-Ion -- -- -- 118 -- 76 100% -- 9c a1 0x4b Fast Charge Termination % Li-Ion, nickel 96% -- a0 0x4c Fully Charged Clear % Li-Ion, nickel 90% -- a6 95% -- 0x4d Charge Efficiency Li-Ion, nickel 97% -- el 100% -- ff Current Taper Threshold Li-Ion -- -- -- 200 mA -- 12 DeltaT Time Nickel 180 s -- 07 -- -- -- Holdoff Time Nickel 240 s -- 04 -- -- -- Current Taper Qual Voltage Li-Ion -- -- -- 128 mV -- 40 0x50 Manufacturers Data Length Li-Ion, nickel 7 -- 07 7 -- 07 0x51 Control Mode Li-Ion, nickel 4 04 4 0x52 Digital Filter Li-Ion, nickel 50 V -- 2d 50 V -- 2d 0x53 Self-Discharge Rate Li-Ion, nickel 1% -- cb 0.21% -- 05 0x54 Battery Low % Li-Ion, nickel 7% -- 12 7% -- 12 0x55 Near Full Li-Ion, nickel 200 mAh -- 64 200 mAh -- 64 Reserved -- 0 -- 00 0 -- 00 0x4e 0x4f 0x56 0x57 04 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 41 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Table 10. EEPROM Memory Map (continued) EEPROM Address Name Data Data Chemistry NiMH Example MSB LSB Li-Ion Example MSB LSB 0x58 0x59 Reserved -- 0 -- 00 0 -- 00 0x5a 0x5b Reserved -- 0 -- 00 0 -- 00 0x5c 0x5d Reserved -- 0 00 00 0 00 00 (1) Li-Ion, nickel 0 00 00 0 00 00 0x60 VFC Offset* (1) Li-Ion, nickel 0 -- 00 0 -- 00 0x61 Temperature Offset* (1) Li-Ion, nickel 0 -- 00 0 -- 00 0x5e 0x5f 0x62 VFC Offset* (1) Li-Ion, nickel 0 -- 00 0 -- 00 Cell 2 Calibration Factor* (1) Li-Ion -- -- -- 0 -- 00 Efficiency Temperature Compensation Nickel 0.25% -- 20 -- -- -- Cell 3 Calibration Factor* (1) Li-Ion -- -- -- 0 -- 00 Efficiency Drop Off Percentage Nickel 96% -- a0 -- -- -- Cell 4 Calibration Factor* (1) Li-Ion -- -- -- 0 -- 00 Efficiency Reduction Rate Nickel 1% -- 50 -- -- -- ADC Offset* 0x63 0x64 0x65 (2) 0x66 0x67 ADC Voltage Gain* Li-Ion, nickel 16 : 1 4e 20 16 : 1 4e 20 0x68 0x69 ADC Sense Resistor Gain* (2) Li-Ion, nickel 0.05 30 d4 0.05 30 d4 0x6a 0x6b VFC Sense Resistor Gain* (2) Li-Ion, nickel 0.05 20 00 0.05 20 00 0x6c 0x6d VOC 25% Li-Ion, nickel 11500 mV d3 14 10550 mV d6 ca 0x6e 0x6f VOC 50% Li-Ion, nickel 12500 mV cf 2c 10750 mV d6 02 0x70 0x71 VOC 75% Li-Ion, nickel 13500 mV cb 44 11200 mV d4 40 0x72 0x73 EDVF/EDV0 Li-Ion, nickel 9500 mV 25 1c 10265 mV 28 19 0x74 0x75 EMF/ EDV1 Li-Ion, nickel 10000 mV 27 10 11550 2d 1e 0x76 0x77 EDV T0 Factor Li-Ion, nickel 0 00 00 4475 11 7b 00 eb 0x78 0x79 EDV C1/C0 Factor/EDV2 Li-Ion, nickel 10500 mV 29 04 C1 = 0 C0 = 235 0x7a 0x7b EDV R0 Factor Li-Ion, nickel 0 00 00 5350 14 e6 0x7c 0x7d EDV R1 Factor Li-Ion, nickel 0 -- 00 250 00 fa 0x7e 0x7f Check Byte 2 Li-Ion, nickel 42330 a5 5a 42330 a5 5a (1) (2) Reserved locations must be set as shown. Locations marked with an asterisk are calibration values that can be adjusted for maximum accuracy. For these locations the table shows the appropriate default or initial setting. Reserved locations must be set as shown. Locations marked with an asterisk are calibration values that can be adjusted for maximum accuracy. For these locations the table shows the appropriate default or initial setting. EDV Thresholds and Near-Full Percentage The bq2060A uses three pack voltage thresholds to provide voltage-based warnings of low battery capacity. The bq2060A uses the values stored in EEPROM for the EDV0, EDV1, and EDV2 values or calculates the three thresholds from a base value and the temperature, capacity, and rate adjustment factors stored in EEPROM. If EDV compensation is disabled then EDV0, EDV1, and EDV2 are stored directly in mV in EE 0x72-0x73, EE 0x74-0x75, and EE 0x78-0x79, respectively. For capacity correction at EDV2, Battery Low % EE 0x54 can be set at a desired state-of-charge, STATEOFCHARGE%, in the range of 5 to 20%. Typical values for STATEOFCHARGE% are 7-12% representing 7-12% capacity. Battery Low % = STATEOFCHARGE% x 2.56 (7) The bq2060A updates FCC if a qualified discharge occurs from a near-full threshold to EDV2. The desired near-full threshold window, NFW (mAh), is programmed in Near Full in EE 0x55. Near Full = 42 NFW 2 (8) Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com EDV Discharge Rate and Temperature Compensation If EDV compensation is enabled, the bq2060A calculates battery voltage to determine EDV0, EDV1, and EDV2 thresholds as a function of battery capacity, temperature, and discharge load. (See Figure 11 and Figure 12.) o Battery Low % = 7%, Temperature = 35 C Battery Low % = 7%, Load = 500 mA 11500 11500 11000 11000 EDV2 10500 EDV2 EDV1 EDV1 Voltage (mV) Voltage (mV) 10500 10000 9500 9000 10000 9500 9000 8500 45C/500 mA 20C/500 mA 8500 8000 7500 10 8000 35C/500mA 7500 35C/1A 35C/2A EDV0 9 8 7 6 5 4 % Capacity 3 2 1 7000 10 0 Figure 11. EDV Calculations vs Capacity for Various Temperatures 9 8 7 6 5 4 % Capacity 3 2 1 0 Figure 12. EDV Calculations vs Capacity for Various Loads The general equation for EDV0, EDV1, and EDV2 calculation is EDV0,1,2 + EMF F BL * ILOAD R0 F TZ F CY where * * EMF is a no-load battery voltage that is higher than the highest EDV threshold that is computed. EMF is programmed in mV in EMF/EDV1 EE 0x74-0x75. ILOAD is the current discharge load. (9) FBL is the factor that adjusts the EDV voltage for battery capacity and temperature to match the no-load characteristics of the battery. F BL + f (C0, C ) C1, T) (10) where C (0%, 3%, or Battery Low % for EDV0, EDV1, and EDV2, respectively) and C0 are the capacity-related EDV adjustment factors. C0 is programmed in the lower 11 bits of EDV C1/C0 Factor/EDV2 EE 0x78-79. The Residual Capacity Factor is stored in the upper 5 bits of EE 0x78-0x79. Residual Capacity Factor C1 = RESIDUAL% * 2.56. RESIDUAL% is the desired battery capacity remaining at EDV0 (RM = 0). * T is the current temperature in K R0*FTZ represents the resistance of the battery as a function of temperature and capacity. F TZ + f (R1, T0, T, C ) C1, TC) * * * * * (11) R0 is the first-order rate dependency factor stored in EDV R0 Factor EE 0x7a-0x7b. T is the current temperature; C is the battery capacity relating to EDV0, EDV1, and EDV2; and C1 is desired residual battery capacity remaining at EDV0 (RM = 0). R1 adjusts the variation of impedance with battery capacity. R1 is programmed in EDV R1 Factor 0x7c-0x7d. T0 adjusts the variation of impedance with battery temperature. T0 is programmed in EDV T0 Factor 0x76-0x77. TC adjusts the variation of impedance for cold temperature (T < 23C). TC is programmed in EDV TC 0x07. the EE EE EE FCY is the factor that adjusts for changing cell impedance as the battery pack is cycled: Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 43 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com F CY + f (A0, Cycle Count()) (12) where A0 is the EDV aging factor that is stored in EDV A0 Factor EE 0x06. It should be set to 0 for most applications. Typical values for the EDV compensation factors for a Li-ion 3s3p 18650 pack are * EMF = 11550 * T0 = 4475 * C0 = 235 * C1 = 0 * R0 = 5350 * R1 = 250 * A0 = 0 * TC = 3 The graphs in Figures 7, 8, and 9 show the calculated EDV0, EDV1, and EDV2 thresholds versus capacity using the typical compensation values for different temperatures and loads for a Li-ion 3s3p 18650 pack. The compensation values vary widely for different cell types and manufacturers and must be matched exactly to the unique characteristics for optimal performance. Overload Current Threshold The Overload Current threshold is a 16-bit value stored in EE 0x46-0x47 in mA units. Midrange Capacity Corrections Three voltage-based thresholds, VOC25 EE 0x6c-0x6d, VOC50 EE 0x6e-0x6f, and VOC75 EE 0x70-0x71, are used to test the accuracy of the RM-based on open-circuit pack voltages. These thresholds are stored in the EEPROM in 2s complement of voltage in mV. The values represent the open-circuit battery voltage at which the battery capacity should correspond to the associated state of charge for each threshold. Self-Discharge Rate The nominal self-discharge rate, %PERDAY (% per day), is programmed in an 8-bit value Self-Discharge Rate EE 0x53 by the following relation: ae 52.73 o Self -Discharge Rate = 256 - c / e %PERDAY o (13) If programmed to 0, then self-discharge accumulation is disabled. Light-Load Current The amount of light-load current in mA, ILEAK, used for compensation is stored in Light Discharge Current in EE 0x2b as follows: ILEAK 1024 Light -Discharge Current = 45 (14) ILEAK is between 0.044 and 11.2 mA. Charge Efficiency The bq2060A uses four charge-efficiency factors to compensate for charge acceptance. These factors are coded in Charge Efficiency (EFF%), Efficiency Reduction Rate (ERR%), Efficiency Drop Off Percentage (EDOP%), and Efficiency Temperature Compensation (TEFF%). The bq2060A applies the efficiency factor, EFF%, when RelativeStateOfCharge() is less than the value coded in Efficiency Drop Off Percentage EE 0x64. When RelativeStateOfCharge() is greater than or equal to the value coded in Efficiency Drop Off Percentage, EFF% and ERR% determine the charge efficiency rate. ERR% defines the percent efficiency reduction per percentage point of RelativeStateOfCharge() over Efficiency Drop Off Percentage. EFF% is encoded in Charge Efficiency EE 0x4d according to the following equation: 44 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Charge Efficiency = 10 x (EFF% - 74.5 ) (15) where 74.5 EFF% 100 ERR% is encoded in Efficiency Reduction Rate EE 0x65 according to the following equation: Efficiency Reduction Rate = ERR% 0.0125 where * 0 ERR% 3.19 (16) The Efficiency Drop Off Percentage is stored in 2s complement of percent. The bq2060A also adjusts the efficiency factors for temperature. TEFF% defines the percent efficiency reduction per degree C over 25C. TEFF% is encoded in Efficiency Temperature Compensation EE 0x63 according to the following equation: Efficiency Temperature Compensation = TEFF% x 1.6 0.0125 where * 0 TEFF% 1.99 (17) The bq2060A applies all four charge-compensation factors when the CHEM bit in Pack Configuration is not set denoting a nickel pack. Effective Charge Efficiency (nickel only) = EFF% - ERR% [RSOC() - EDOP%] - TEFF% eT(o C) - 25o C u e u where * RSOC() EFF% and T 25C (18) If CHEM is set denoting a Li-ion pack, the bq2060A applies only the value coded in Charge Efficiency and makes no other adjustments for charge acceptance. Charge Limits and Termination Techniques Charging Voltage The 16-bit value, Charging Voltage EE 0x0a-0x0b programs the ChargingVoltage() value broadcast to a Smart Charger. It also sets the base value for determining overvoltage conditions during charging and voltage compliance during a constant-voltage charging methodology. It is stored in mV. Overvoltage The 8-bit value, Overvoltage Margin EE 0x48, sets the limit over ChargingVoltage() that is to be considered as an overvoltage charge-suspension condition. The voltage in mV above the ChargingVoltage(), VOVM, that should trigger a charge suspend is encoded in Overvoltage Margin as follows: Overvoltage Margin + VOVM 16 where * VOVM is between 0 and 4080 mV. (19) Charging Current ChargingCurrent() values are either broadcast to a Level 2 Smart Battery Charger or read from the bq2060A by a Level 3 Smart Battery Charger. The bq2060A sets the value of ChargingCurrent(), depending on the charge requirements and charge conditions of the pack. When fast charge is allowed, the bq2060A sets ChargingCurrent() to the rate programmed in Fast Charging Current EE 0x1a-0x1b. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 45 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com When fast charge terminates, the bq2060A sets ChargingCurrent() to zero and then to the Maintenance Charging Current EE 0x1c-0x1d when the termination condition ceases. When Voltage() is less than EDV0, the bq2060A sets ChargingCurrent() to Pre-charge Current EE 0x1e-0x1f. Typically, this rate is larger than the maintenance rate to charge a deeply depleted pack up to the point where it may be fast charged. Fast Charging Current, Maintenance Charging Current, and Pre-Charge Current are stored in mA. Charge Suspension During charge, the bq2060A compares the current to the ChargingCurrent() plus the value IOIM. If the pack is charged at a current above the ChargingCurrent() plus IOIM, the bq2060A sets ChargingCurrent() to zero to stop charging. IOIM is programmed in the EEPROM value, Overcurrent Margin, encoded as follows: Overcurrent Margin + IOIM 16 (20) Overcurrent Margin EE 0x49 may be used to program IOIM values of 0 to 4080 mA in 16-mA steps. The desired temperature threshold for charge suspension, MAXTEMP, may be programmed between 45C and 69C in 1.6C steps. Charge-suspension temperature is increased by 16 above the programmed value of MaxT if bit 5 in Miscellaneous Option EE 0x08 is set. MaxT DeltaT EE 0x45 (most significant nibble) is stored in a 4-bit value as shown: e 69 - MAXTEMP u MaxT = e u 1.6 e u (21) The bq2060A suspends fast charge when fast charge continues past full by the amount programmed in Maximum Overcharge EE 0x2e-0x2f. Maximum Overcharge is programmed in 2s complement form of charge in mAh. FULLY_CHARGED Bit Clear Threshold The bq2060A clears the FULLY_CHARGED bit in BatteryStatus() when RelativeStateOfCharge() reaches the value, Fully Charged Clear % EE 0x4c. Fully Charged Clear % is an 8-bit value and is stored as a 2s complement of percent. Fast Charge Termination Percentage The bq2060A sets RM to a percentage of FCC on charge termination if the CSYNC bit is set in the Pack Configuration register. The percentage of FCC is stored in Fast Charge Termination % in EE 0x4b. The value is stored in 2s complement of percent. Cycle Count Threshold Cycle Count Threshold 0x3c-0x3d sets the number of mAh that must be removed from the battery to increment CycleCount(). Cycle Count Threshold is a 16-bit value stored in 2s complement of charge in mAh. T/t Rate Programming The T portion of the T/t rate is programmed in DeltaT, the low nibble of MaxT DeltaT EE 0x45 (least significant nibble). The portion is programmed in DeltaT Time EE 0x4e. DTDt + [DeltaT 2 ) 16]10 C [320 * DeltaT 20] s (22) Table 11. 46 DeltaT (C) DeltaT_Time t (s) 0 1.6 00 320 1 1.8 01 300 2 2.0 02 280 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Table 11. (continued) DeltaT (C) DeltaT_Time t (s) 3 2.2 03 260 4 2.4 04 240 5 2.6 05 220 6 2.8 06 200 7 3.0 07 180 8 3.2 08 160 9 3.4 09 140 a 3.6 0a 120 b 3.8 0b 100 c 4.0 0c 80 d 4.2 0d 60 e 4.4 0e 40 f 4.6 0f 20 T/t Holdoff Timer Programming The holdoff timer is programmed in the lower nibble of Holdoff Time EE 0x4f. The holdoff time is 320 s minus 20 times the Holdoff Time value. Holdoff Time Holdoff Time (s) Holdoff Time Holdoff Time (s) 00 320 08 160 01 300 09 140 02 280 0a 120 03 260 0b 100 04 240 0c 80 05 220 0d 60 06 200 0e 40 07 180 0f 20 Current Taper Termination Characteristics Two factors in the EEPROM set the current taper termination for Li-ion battery packs. The two coded locations are Current Taper Qual Voltage EE 0x4f and Current Taper Threshold EE 0x4e. Current taper termination occurs during charging when the pack voltage is above the charging voltage minus CELLV (mV) and the charging current is below the threshold coded in Current Taper Threshold for at least 80 s. Current Taper Qual Voltage + CELLV 2 R i Current TaperThreshhold + s 0.5025 (23) (24) where i = the desired current termination threshold in mA, and RS = VFC sense resistor in ohms. PACK OPTIONS Pack Configuration Pack Configuration EE 0x3f contains bit-programmable features. b7 DMODE b6 SEAL b5 CSYNC b4 CEDV b3 VCOR b2 CHEM b1 LCC1 b0 LCC0 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 47 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com DMODE The DMODE bit determines RelativeStateOfCharge() whether the 0 LEDs reflect AbsoluteStateOfCharge() 1 LEDs reflect RelativeStateOfCharge() LED outputs will indicate AbsoluteStateOfCharge() or SEAL The SEAL bit determines the SMBus access state of the bq2060A on reset 0 SMBus commands (0x00-0xff) are accessible for both read and write. 1 SMBus read access is limited to commands (0x05-0x1c) and (0x20-0x23). SMBus read/write access is limited to commands (0x00-0x04), (0x2f), and (0x3c-0x3f). CSYNC In usual operation of the bq2060A, the CSYNC bit is set so that the coulomb counter is adjusted when a fast charge termination is detected. In some applications, especially those where an externally controlled charger is used, it may be desirable NOT to adjust the coulomb counter. In these cases the CSYNC bit should be cleared. 0 The bq2060A does not alter RM at the time of a valid charge termination. 1 The bq2060A updates RM with a programmed percentage of FCC at a valid charge termination. CEDV The CEDV bit determines whether the bq2060A implements automatic EDV compensation to calculate the EDV0, EDV1, and EDV2 thresholds base on rate, temperature, and capacity. If reset, the bq2060A uses the fixed values programmed in EEPROM for EDV0, EDV1 and EDV2. If set, the bq2060A calculates EDV0, EDV1, and EDV2. 0 EDV compensation disabled 1 EDV compensation enabled VCOR The VCOR bit enables the midrange voltage correction algorithm. When set, the bq2060A compares the pack voltage to RM and may adjust RM according to the values programmed in VOC25, VOC50, and VOC75. 0 Midrange corrections disabled 1 Midrange corrections enabled CHEM The CHEM bit configures the bq2060A for nickel packs (NiCd or NiMH) or Li-ion packs. When set, the bq2060A employs the configuration parameters in EEPROM designated for Li-ion. When not set, the bq2060A employs the configuration parameters designated for nickel. 0 The bq2060A uses nickel configuration parameters. 1 The bq2060A uses Li-ion configuration parameters. LCC0 and LCC1 The LCC0 and LCC1 bits configure the cell voltage inputs (VCELL1-4). 48 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com NO. OF SERIES CELLS LCC1, LCC0 CELL VOLTAGE INPUTS NA 00 VCELL4= Cell Stack 2 01 VCELL1 = Cell 1 VCELL2 = Cell 2 3 10 VCELL1= Cell 1 VCELL2= Cell 2 VCELL3= Cell 3 VCELL1= Cell 1 4 VCELL2= Cell 2 11 VCELL3= Cell 3 VCELL4= Cell 4 For Li-ion packs with individual measurements, LCC0 and LCC1 define the number of series elements and their voltage measurement inputs. In each case (2, 3, or 4), the bq2060A uses the highest numbered cell voltage input to measure the pack voltage measurement as returned with Voltage(). For nickel chemistries or Li-ion without single-cell measurements, LCC0 and LCC1 must be set to 00. VCELL4 is the pack voltage input for this programming. Remaining Time and Capacity Alarms Remaining Time Alarm in EE 0x02-0x03 and Remaining Capacity Alarm in 0x04-0x05 set the alarm thresholds used in the SMBus command codes 0x01 and 0x02, respectively. Remaining Time Alarm is stored in minutes and Remaining Capacity Alarm in mAh. Secondary Protection Limits for Li-Ion The cell undervoltage (VUV) and overvoltage (VOV) limits are programmed in Cell Undervoltage/Over Voltage EE 0x4a according to the equations: V - 4096 Cell Undervoltage/Overvoltage (lower) = OV 32 (25) VOV - 2048 Cell Undervoltage/Overvoltage (upper) = 64 (26) CELL UNDER/OVERVOLTAGE (upper nibble) VUV (mV) CELL UNDER/OVERVOLTAGE (lower nibble) VOV (mV) 0 2048 0 4096 1 2112 1 4128 2 2176 2 4160 3 2240 3 4192 4 2304 4 4224 5 2368 5 4256 6 2432 6 4288 7 2496 7 4320 8 2560 8 4352 9 2624 9 4384 a 2688 a 4416 b 2752 b 4448 c 2816 c 4480 d 2880 d 4512 e 2944 e 4544 f 3008 f 4576 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 49 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Safety Overtemperature EE 0x09 sets Safety Overtemperature Threshold (SOT) level for the CFC pin. It can be programmed for a threshold of 69C to 94.5C. This range is increased by 16C if Miscellaneous Options bit 5 = 1. Safety Overtemperature = (94.5 - SOT)*10 if Miscellaneous Options bit 5 = 0. Safety Overtemperature = (110.5 - SOT)*10 if Miscellaneous Options bit 5 = 1. Miscellaneous Options Miscellaneous Options EE 0x08 contains bit-programmable options. Bits 0-4 should be programmed to zero. b7 NE1 b6 SOT b5 HIT b4 0 b3 0 b2 0 b1 0 b0 0 NE1 The NE1 bit disables the EDV1 threshold. 0 EDV1 enabled 1 EDV1 disabled SOT The SOT bit controls override of the CFC pin for Safety Overtemperature threshold. 0 CFC control with overvoltage, maximum temperature, and safety overtemperature. 1 CFC control; only with safety overtemperature. HIT The HIT bit controls the available temperature range for maximum temperature and Safety Overtemperature. 0 Maximum temperature set in normal 45C-69C range and Safety Overtemperature is 69C - 94.5C. 1 Maximum temperature set in elevated 61C-85C range and Safety Overtemperature is 85C - 110.5C. Cycle Count Initialization Cycle Count EE 0x0e-0x0f stores the initial value for the CycleCount() function. It should be programmed to 0x0000. Control Modes Control Mode EE0x51 contains additional bit programmable features. b7 NDF b6 -- b5 HPE b4 CPE b3 LED b2 SC b1 -- b0 SM NDF The NDF bit disables the digital filter during discharge if the SMBC and SMBD lines are high. 0 Digital filter enabled all the time 1 Digital filter disabled if SMBC and SMBD are high 50 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com HPE The HPE bit enables/disables PEC transmissions to the Smart Battery host for master mode alarm messages. 0 No PEC byte on alarm warning to host 1 PEC byte on alarm warning to host CPE The CPE bit enables/disables PEC transmissions to the Smart Battery Charger for master mode alarm messages. 0 No PEC byte on broadcasts to charger 1 PEC byte on broadcasts to charger LED The LED bit configures the bq2060A for 4- or 5-LED indication. 0 Selects the 5-LED indication mode 1 Selects the 4-LED indication mode SC The SC bit enables learning cycle optimization for a Smart Charger or independent charge. 0 Learning cycle optimized for independent charger 1 Learning cycle optimized for Smart Charger SM The SM bit enables/disables master mode broadcasts by the bq2060A. 0 Broadcasts to host and charger enabled 1 Broadcasts to host and charger disabled If the SM bit is set, modifications to bits in BatteryMode() do not re-enable broadcasts. MEASUREMENT CALIBRATION ADC To describe how the bq2060A calculates reported battery and individual cell voltages, the following abbreviations and designations are used: * VCELL1-4 = voltages at the input pins of the bq2060A * VCELL1-4 = reported cell voltages * Vn1-4 = voltages at the different series nodes in the battery * Voltage() = reported battery voltage * Vsr = voltage across the sense resistor The reported voltages measurements, Voltage() and VCELL1-4, may be calibrated by adjusting five 8- or 16-bit registers in EEPROM: ADC Offset in EE0x62, ADC Voltage Gain in EE 0x66-0x67, Cell 2 Calibration Factor in EE 0x63, Cell 3 Calibration Factor in EE 0x64, and Cell 4 Calibration Factor in EE 0x65. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 51 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com The bq2060A first computes the node voltages Vn1, Vn2, Vn3, and Vn4. The node voltages are inputs to the voltage dividers to the VCELL1 through VCELL4 input pins of the bq2060A. The bq2060A computes node voltages to calculate the five reported voltages by the bq2060A: Voltage(), VCELL1, VCELL2, VCELL3, and VCELL4. An ADC Voltage Gain factor of 20,000 is the nominal value when using the recommended cell-voltage division ratios of 16:1 on the VCELL4 and VCELL3 inputs and 8:1 on the VCELL2 and VCELL1 inputs. The bq2060A subtracts the voltage across the sense resistor from the measurements so that the reported voltages reflect the cell-stack voltages only. The bq2060A compute the node voltages as follows: Vn1 + VCELL 32768 ) ADC Offset 1250 Vn2 + VCELL 32768 ) ADC Offset 1250 Gain ADC Voltage 65536 (27) ADC Voltage Gain ) 865536Cell 2 CalibrationFactor Vn3 + VCELL 32768 ) ADC Offset 1250 ADC Voltage Gain ) 8 Cell 3 CalibrationFactor 65536 (28) 2 65536 (29) Vn4 + VCELL 32768 ) ADC Offset 1250 ADC Voltage Gain ) 8 Cell 4 CalibrationFactor 65536 2 65536 (30) Note: With LCC1 - LCC0 = 00, Cell 4 Calibration Factor = 0. ADC Offset adjusts the ADC reading for voltage and current measurements. ADC Offset is a signed 8-bit value that cancels offset present in the circuit with no potential or current flow. ADC Offset is typically set between -20 and 20. The bq2060A uses the computed node voltages to calculate the reported voltages. It does not compute reported cell voltages greater than the selected number of nodes. If no individual cell voltages are to be measured, LCC1 - LCC0 should be set to 00 and the top of the battery stack should be connected to a voltage divider to the VCELL4 input. The bq2060A computes the reported voltages as follows: * Voltage() = Vn4 (LCC1 - LCC0 = 11 or 00) - Vsr * Voltage() = Vn3 (LCC1 - LCC0 = 10) - Vsr * Voltage() = Vn2 (LCC1 - LCC0 = 01) - Vsr * VCELL4 = Vn4- Vn3 * VCELL3 = Vn3- Vn2 * VCELL2 = Vn2- Vn1 * VCELL1 = Vn1- Vsr Current The bq2060A scales Current() to mA units by the 16-bit value ADC Sense Resistor Gain in EE 0x68-0x69. Adjusting ADC Sense Resistor Gain from its nominal value provides a method to calibrate the current readings for variances in the ADC gain, internal voltage reference, and sense resistor value. The bq2060A calculates Current() by 52 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Current = [(ADC Reading + ADC Offset) x ADC Sense Resistor Gain] 16384 (31) The nominal value for ADC Sense Resistor Gain is given by Equation 4. VFC To calibrate the coulomb counting measurement for VFC gain errors and sense resistor tolerance, the value of VFC Sense Resistor Gain EE 0x6a-0x6b may be adjusted from its nominal value. The nominal value of VFC Sense Resistor Gain is given by Equation 5. The bq2060A VFC circuit can introduce a signal opposite in sign from that of the inherent device and circuit offset to cancel this error. The offset calibration routine is initiated with commands to ManufacturerAccess(). The bq2060A calculates the offset with the calibration routine and stores the calibration value using the least 21 bits of VFC Offset in EE 0x5e-0x60. The least 20 bits store the offset calibration value (OCV). The sign of the offset calibration value is positive if the 21st bit is 0. 0.6 V OCV = VFC Offset19-0 (32) Temperature The bq2060A uses Temperature Offset in EE 0x61 to calibrate the Temperature() function for offset. The required offset adjustment, TOFF (c)), sets Temperature Offset according to Equation 33. Temperature Offset + TOFF 10 (33) where -12.8 TOFF 12.7 CONSTANTS AND STRING DATA EEPROM Constants Check/Byte 1 EE 0x00-0x01 and Check Byte 2 EE 0x7e-0x7f must be programmed to 0x3c7f and 0xa55a, respectively. Specification Information Specification Information EE 0x14-0x15 stores the default value for the SpecificationInfo() function. It is stored in EEPROM in the same format as the data returned by the SpecificationInfo(). Manufacture Date Manufacture Date EE 0x16-0x17 stores the default value for the ManufactureDate() function. It is stored in EEPROM in the same format as the data returned by the ManufactureDate(). Serial Number Serial Number EE 0x18-0x19 stores the default value for the SerialNumber() put Range function. It is stored in EEPROM in the same format as the data returned by the SerialNumber(). Manufacturer Name Data Manufacturer Name Length EE 0x20 stores the length of the desired string that is returned by the ManufacturerName() function. Locations EE 0x21-0x2a store the characters for ManufacturerName() in ASCII code. Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A 53 bq2060A SLUS500D - OCTOBER 2001 - REVISED OCTOBER 2011 www.ti.com Device Name Data Device Name Length EE 0x30 stores the length of the desired string that is returned by the DeviceName() function. Locations EE 0x31-0x37 store the characters for DeviceName() in ASCII code. Device Chemistry Data Device Chemistry Length EE 0x40 stores the length of the desired string that is returned by the DeviceChemistry() function. Locations EE 0x41-0x44 store the characters for DeviceChemistry() in ASCII code. Manufacturers Data Length Manufacturers Data Length EE 0x50 stores the length of the desired number of bytes that is returned by the ManufacturersData() function. It should be set to 7. Spacer REVISION HISTORY Changes from Revision B (September 2005) to Revision C Page * Changed unit for IREG from s to A ..................................................................................................................................... 4 * Deleted VOUT pin from application diagram, and added voltage connection to VCC pin ....................................................... 8 * Modified sentence in Discharge Count Register section .................................................................................................... 12 Changes from Revision C (June 2010) to Revision D Page * Added CAUTION statement to the Pin Descriptions table ................................................................................................... 2 * Added CAUTION statement to the EEPROM section ........................................................................................................ 39 54 Submit Documentation Feedback Copyright (c) 2001-2011, Texas Instruments Incorporated Product Folder Link(s): bq2060A PACKAGE OPTION ADDENDUM www.ti.com 16-Aug-2012 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) BQ2060A-E619DBQ ACTIVE SSOP DBQ 28 40 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR BQ2060A-E619DBQG4 ACTIVE SSOP DBQ 28 40 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR BQ2060A-E619DBQR ACTIVE SSOP DBQ 28 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR BQ2060A-E619DBQRG4 ACTIVE SSOP DBQ 28 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Samples (Requires Login) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. 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Addendum-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device BQ2060A-E619DBQR Package Package Pins Type Drawing SSOP DBQ 28 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 16.4 Pack Materials-Page 1 6.5 B0 (mm) K0 (mm) P1 (mm) 10.3 2.1 8.0 W Pin1 (mm) Quadrant 16.0 Q1 PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) BQ2060A-E619DBQR SSOP DBQ 28 2500 367.0 367.0 38.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. 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