General Description
The MAX1282 evaluation system (EV system) is a com-
plete four-channel data-acquisition system consisting of a
MAX1282 evaluation kit (EV kit), Maxim 68HC16MODULE-
DIP microcontroller (µC) module, and USBT0232. The
MAX1282 is a high-speed, 12-bit data-acquisition system.
Windows®98/2000/XP-compatible software provides a
handy user interface to exercise the MAX1282’s features.
Order the complete EV system (MAX1282EVC16) for
comprehensive evaluation of the MAX1282 using a PC.
Order the EV kit (MAX1282EVKIT) if the 68HC16MOD-
ULE-DIP module has already been purchased with a
previous Maxim EV system, or for custom use in other
µC-based systems.
Features
oProven PCB Layout
oConvenient On-Board Test Points
oData-Logging Software
oFully Assembled and Tested
oEV Kit Software Supports Windows 98/2000/XP
with RS-232/COM Port
oEV Kit Software Supports Windows 2000/XP with
USB Port
Evaluate: MAX1282
MAX1282 Evaluation Kit/Evaluation System
________________________________________________________________
Maxim Integrated Products
1
19-0674; Rev 1; 5/07
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Ordering Information
PART TEMP RANGE INTERFACE
MAX1282EVKIT 0°C to +70°C User supplied
MAX1282EVC16 0°C to +70°C Windows software
Note: MAX1282 software is designed for use with the complete
EV system, MAX1282EVC16 (includes 68HC16MODULE-DIP
module, USBT0232, and MAX1282EVKIT). If the MAX1282
evaluation software will not be used, the MAX1282EVKIT board
can be purchased by itself, without the µC.
MAX1282 EV System
PART QTY DESCRIPTION
MAX1282EVKIT 1 MAX1282 EV kit
68HC16MODULE-DIP 1 68HC16 µC module
USBT0232+ 1 USB-to-COM port
adapter board
MAX1282 EV Kit Files
FILE DESCRIPTION
INSTALL.EXE Installs the EV kit files on your computer
MAX1282.EXE Application program
KIT1282.C16 Software loaded into 68HC16 μC
Windows is a registered trademark of Microsoft Corp.
Component Lists
+
Denotes a lead-free and RoHS-compliant EV kit.
MAX1282 EV Kit
DESIGNATION QTY DESCRIPTION
C1−C4, C10 5 0.01µF ceramic capacitors
C9 1 4.7µF tantalum capacitor
C11, C13 2 0.1µF ceramic capacitors
C12, C14 2 10µF, 10V tantalum capacitors
J1 1 2x20 right-angle socket
JU1 1 2-pin header
JU2 1 3-pin header
R1−R4 4 300Ω ±5% resistors
R9, R10 2 10Ω ±1% resistors
TP1 1 8-pin header
U1 1 MAX1282BCUE (16-pin TSSOP)
— 1 PCB: MAX1282 Evaluation Kit
Quick Start
Recommended Equipment
(USB Port/PC Connection Option)
Before beginning, the following equipment is needed:
• MAX1282 EV system:
MAX1282 EV kit
68HC16MODULE-DIP
USBTO232 (USB cable included)
• A small DC power supply, such as a 12VDC, 0.25A
plug-in transformer, or a 9V battery
• A user-supplied Windows 2000/XP computer with an
available USB port to connect to the USBTO232
board
Note: In the following sections, software-related items
are identified by bolding. Text in bold refers to items
directly from the EV kit software. Text in bold and
underlined refers to items from the Windows 2000/XP
operating system.
Connections and Setup
The MAX1282 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power until all connec-
tions are completed.
1) Visit the Maxim website (www.maxim-ic.com) to
download the latest version of the USBTO232 User
Guide. Follow the steps in the USBTO232 User
Guide
Quick Start
section and return to step 2 of
this
Quick Start
section when finished.
2) Carefully connect the boards by aligning the 40-pin
header of the MAX1282 EV kit with the 40-pin con-
nector of the 68HC16MODULE-DIP module. Gently
press them together. The two boards should be
flush against one another.
3) Ensure that jumper JU1 is closed and jumper JU2 is
in the 1-2 position (Table 1).
4) Connect a 7VDC to 20VDC power source to the µC
module at the terminal block located next to the
on/off switch, along the top-edge of the µC module.
Observe the polarity marked on the board.
5) Connect the USBTO232 board to the
68HC16MODULE-DIP module if you have not done
so already.
6) The MAX1282 EV kit software should have already
been downloaded and installed in the USBTO232
Quick Start.
7) Start the MAX1282 program by opening its icon in
the Start | Programs menu.
8) Turn on the power supply and slide SW1 to the ON
position on the 68HC16MODULE-DIP module.
Press the OK button to automatically connect and
download the KIT1282.C16 file to the module.
9) Apply an input signal between analog common
(COM) and input channel CH0. Observe the read-
out on the screen.
Recommended Equipment (RS-232-to-COM
Port/PC Connection Option)
Before beginning, the following equipment is needed:
• MAX1282 EV system:
MAX1282 EV kit
68HC16MODULE-DIP
• A small DC power supply, such as a 12VDC, 0.25A
plug-in transformer, or a 9V battery
• A user-supplied Windows 98/2000/XP computer
with an available serial communications port,
preferably a 9-pin plug
• A serial cable to connect the computer’s serial port
to the 68HC16MODULE-DIP
Note: In the following sections, software-related items
are identified by bolding. Text in bold refers to items
directly from the EV kit software. Text in bold and
underlined refers to items from the windows
98/2000/XP operating system
Connections and Setup
The MAX1282 EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power until all connec-
tions are completed.
1) Visit the Maxim website (www.maxim-ic.com/evkit-
software) to download the latest version of the EV
kit software. Save the EV kit software to a temporary
folder and uncompress the file (if it is a .zip file).
2) Install the MAX1282 EV kit software on your com-
puter by running the INSTALL.EXE program. The
program files are copied and icons are created for
them in the Windows Start | Programs menu.
3) Carefully connect the boards by aligning the 40-pin
header of the MAX1282 EV kit with the 40-pin con-
nector of the 68HC16MODULE-DIP module. Gently
press them together. The two boards should be
flush against one another.
4) Ensure that jumper JU1 is closed and jumper JU2 is
in the 1-2 position (Table 1).
5) Connect a 7VDC to 20VDC power source to the µC
module at the terminal block located next to the
on/off switch, along the top-edge of the µC module.
Observe the polarity marked on the board.
6) Connect a cable from the computer’s serial port to
the µC module. If using a 9-pin serial port, use a
straight-through, 9-pin female-to-male cable. If the
only available serial port uses a 25-pin connector, a
standard 25-pin to 9-pin adapter will be required.
The EV kit software checks the modem status lines
(CTS, DSR, and DCD) to confirm that the correct
port has been selected.
7) Start the MAX1282 program by opening its icon in
the Start | Programs menu.
8) Turn on the power supply and slide SW1 to the ON
position. The program will automatically download
KIT1282.C16 to the module.
9) Apply an input signal between analog common
(COM) and input channel CH0. Observe the read-
out on the screen.
Evaluate: MAX1282
MAX1282 Evaluation Kit/Evaluation System
2 _______________________________________________________________________________________
Table 1. Jumper Functions
JUMPER POSITION FUNCTION
Closed* COM tied to GND
JU1 Open COM must be connected to
analog common
1-2* Operate
JU2 2-3 Shutdown
*Default position.
Evaluate: MAX1282
MAX1282 Evaluation Kit/Evaluation System
_______________________________________________________________________________________ 3
Detailed Description
MAX1282 Stand-Alone EV Kit
The MAX1282 EV kit provides a proven PCB layout to
evaluate the MAX1282. It must be interfaced to appropri-
ate timing signals for proper operation. Connect +5V to
VDD, and connect ground return to GND (Figure 1). Refer
to the MAX1282 IC data sheet for timing requirements.
MAX1282 EV System
The MAX1282 EV system operates from a user-supplied
7VDC to 20VDC power supply. Windows 98/2000/XP-
compatible software running on a PC interfaces to the
EV system board through the computer’s serial commu-
nications port (virtual COM port). See the
Quick Start
section for set-up and operating instructions.
Description of Software
The evaluation software’s main window controls the seri-
al clock speed and sample rate. It displays the voltage
and output code, as well as some input signal statistics.
A separate graph window shows the data changing in
real time. The update rate is limited to about 10 samples
per second, due to COM port bandwidth limitations.
Controls
The control word is divided into several fields. To
change the active control word, drop down the appro-
priate field’s combo box and select the desired option.
If the QSPI™ clock is set to STOP, then configuration
data will not be sent until the READ button is pressed.
Statistics
The Minimum and Maximum fields show the highest
and lowest readings acquired. The Average field shows
a running mean. The Clear button resets the statistics.
To remove offset errors, first apply 0V to the active input
channel, clear statistics, acquire some samples, and
then check Tare. This average offset voltage will now be
subtracted from all subsequent measurements.
Sampling
Choose the desired sampling rate (QSPI clock), sampling
size (Sample! menu item), and press Begin Sampling!
(in Sample! pop-up window). Sample size is restricted to a
power of two to permit FFT processing once the data is
saved to a file. After the samples have been collected, the
data is automatically uploaded to the host and is graphed.
Once displayed, the data can optionally be saved to a file.
Saving Graphs to Disk
Data in the real-time graph and in sampled data graphs
may be saved to a file. Only the raw output codes are
saved, but voltages may be inferred, based on the ref-
erence voltage and the maximum code value.
Scanning All Channels Input Signal
To scan through all channels, select SCAN from the
Input menu.
Evaluating Shutdown
The evaluation software configures the 68HC16’s QSPI
submodule to continuously read data from the
MAX1282 into the 68HC16. The sample rate is con-
trolled by the QSPI clock. To evaluate power-saving
modes, these automatic updates must be stopped.
First, set the QSPI clock control to STOP. This reconfig-
ures the 68HC16’s QSPI submodule to stop driving the
serial clock. Second, in the evaluation software’s main
window, uncheck the Read Every...msec check-box.
Next, choose the desired software power-down control
word, and press the Read button to send the new con-
figuration to the MAX1282. If evaluating the hardware
shutdown, move jumper JU2 to the 2-3 position.
Reference Voltage
The evaluation software assumes a 2.5V reference volt-
age, unless otherwise specified. Refer to the MAX1282
IC data sheet for more information. To override this
value, type the new reference voltage into the Vref edit
box and press the Set Vref button. Note: This new
VREF value is used only by the evaluation software and
does not physically change the reference voltage.
Description of Hardware
U1, the MAX1282, is a high-speed, multichannel, 12-bit
data-acquisition system. Resistors R1–R4 and capacitors
C1–C4 form single-pole, lowpass anti-aliasing filters with
a nominal 3µs time constant and a corner frequency of
approximately 50kHz. C9 and C10 bypass the ADC’s
voltage reference and reference buffer. When plugged
into the 68HC16MODULE, the VDD circuit is powered by
+5V. (See Figure 1 and refer to the MAX1282 data sheet.)
Troubleshooting
Problem: No output measurement. System seems to
report zero voltage or fails to make a measurement.
Check the VDD supply voltage. Check the reference
voltage using a digital voltmeter (DVM). Use an oscillo-
scope to verify that the conversion-start signal is being
strobed. Verify that SHDN is being driven high.
Problem: Measurements are erratic, unstable; poor
accuracy.
Check the reference voltage using a DVM. Use an
oscilloscope to check for noise. When probing for
noise, keep the oscilloscope ground return lead as
short as possible, preferably less than 1/2in (10mm).
QSPI is a trademark of Motorola, Inc.
Evaluate: MAX1282
MAX1282 Evaluation Kit/Evaluation System
4 _______________________________________________________________________________________
Figure 1. MAX1282 EV Kit Schematic
MAX1282
U1
116
VDD1
2
CH0
15
VDD2
3
CH1
14
SCLK
4
CH2
5
CH3
12
DIN
6
SSTRB
7
DOUT
89
GND
COM
REFADJ
REF
SHDN
CS
13
11
10
REFADJ
C10
0.01μF
C13
0.1μF
R10
10Ω
1%
C14
10μF
10V
TP1-7
J1-8
VDD2
TP1-6
J1-37
TP1-4
J1-36
TP1-5
J1-31
J1-38
TP1-3
J1-29
TP1-2
J1-35
GND
TP1-1
J1-1
J1-2
J1-3
J1-4
R1
300Ω
C1
0.01μF
CH0
R2
300Ω
C2
0.01μF
CH1
R3
300Ω
C3
0.01μF
CH2
R4
300Ω
C4
0.01μF
CH3
COM
JU1 2
1
21
3
JU2
VDD1
SHDN
REF
C9
4.7μF
10V
J1-7
C11
0.1μF
R9
10Ω
1%
C12
10μF
10V
VDD1
VDD1
Evaluate: MAX1282
MAX1282 Evaluation Kit/Evaluation System
_______________________________________________________________________________________ 5
Figure 2. MAX1282 EV Kit Component Placement Guide—
Component Side
1.0"
Figure 3. MAX1282 EV Kit PCB Layout—Component Side
1.0"
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
6
_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Evaluate: MAX1282
MAX1282 Evaluation Kit/Evaluation System
Figure 4. MAX1282 EV Kit PCB Layout—Solder Side
1.0"
Revision History
Pages changed at Rev 1: Title change—all pages, 1, 2,
3, 5, 6
