MAX1618EVKit EVSystem - Maxim Integrated Products, Inc.

General Description

The MAX1618 evaluation system (EV system) consists

of a MAX1618 evaluation kit (EV kit) and a companion

Maxim SMBus™Interface Board.

The MAX1618 EV kit is an assembled and tested PC

board that demonstrates the MAX1618 temperature

sensor. It monitors the temperature of an external

diode-connected transistor and converts the tempera-

ture to 8-bit, 2-wire serial data. A 2N3904 temperature-

sensor transistor comes soldered to the board in a

SOT23 package, but it can be removed. The board can

then be connected through a twisted pair to a remote

diode closer to your system.

The Maxim SMBus Interface Board (MAXSMBUS) allows

an IBM-compatible PC to use its parallel port to emulate

an Intel System Management Bus (SMBus) 2-wire inter-

face. Windows®3.1/95/98 software provides a user-

friendly interface to exercise the features of the MAX1618.

The program is menu driven and offers a graphic inter-

face with control buttons and status display.

Order the MAX1618EVSYS for complete IBM PC-based

evaluation of the MAX1618. Order the MAX1618EVKIT if

you already have an SMBus interface.

Features

♦Measures and Displays Remote Sensor

Temperature

♦Programmable Alarms and Configuration

♦-55°C to +125°C Operating Temperature Range

♦I2C™/SMBus Compatible

♦Easy-to-Use Menu-Driven Software

♦Assembled and Tested

Evaluates: MAX1618

MAX1618 Evaluation System/Evaluation Kit

________________________________________________________________

Maxim Integrated Products

19-1509; Rev 0; 7/99

SUPPLIER PHONE FAX

Central

Semiconductor 515-435-1110 515-435-1824

MAX1618EVKIT Component List MAX1618EVSYS Component List

Fairchild 408-822-2000 408-822-2102

Motorola 303-675-2140 303-675-2150

Taiyo Yuden 408-573-4150 408-573-4159

PART

MAX1618EVKIT

MAX1618EVSYS Windows Software

User-Supplied

INTERFACE TYPE BOARD TYPE

10 µMAX

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

Ordering Information

Component Suppliers

Shunts3None

Maxim MAX1618EUB1U1

Slide switch1SW1

NPN transistor

Central Semiconductor CMPT3904,

Fairchild MMBT3904, or

Motorola MMBT3904

1Q1

Not installed0JU4

3-pin headers3JU1, JU2, JU3

2 x 10 right-angle female receptacle1J1

2200pF, 50V, X7R ceramic capacitor1C2

0.1µF, 16V, X7R ceramic capacitor

Taiyo Yuden EMK107BJ104KA

1C1

DESCRIPTIONQTY

Note: The MAX1618 software can only be used with the com-

plete evaluation system MAX1618EVSYS, which includes the

MAXSMBUS interface board and the MAX1618EVKIT.

PART

SMBus interface board1MAXSMBUS

MAX1618 evaluation kit1MAX1618EVKIT

DESCRIPTIONQTY

Note: Please indicate you are using the MAX1618 when contact-

ing these component suppliers.

DESIGNATION

SMBus is a trademark of Intel Corp.

Windows is a registered trademark of Microsoft Corp.

I2C is a trademark of Philips Corp.

Evaluates: MAX1618

MAX1618 Evaluation System/Evaluation Kit

2 _______________________________________________________________________________________

Quick Start

Equipment Required

Before you begin, you will need the following equip-

ment:

• An IBM PC-compatible computer capable of run-

ning Windows 3.1/95/98

• A parallel printer port (this is a 25-pin socket on the

back of the computer)

• A standard 25-pin, straight-through male-to-female

cable to connect the computer’s parallel port to the

Maxim SMBus Interface Board

• A DC power supply capable of supplying +7V to

+20V at 100mA

Procedure

1) Carefully connect the boards by aligning the 20-pin

connector of the MAX1618 EV kit with the 20-pin

header of the MAXSMBUS interface board. Gently

press them together. The two boards should be

flush against each other.

Make sure switch SW1 on the MAX1618 EV kit is in

the OFF position. Do not turn on the power until

all connections are made.

2) Connect a +7V to +20V DC power supply to the pads

labeled POS9 and GND1 of the SMBus interface

board.

3) Make sure JU3 is set to the 2–3 position.

4) Connect a cable from the computer’s parallel port

to the SMBus interface board. Use a 25-pin

straight-through, female-to-male cable. To avoid

damaging the EV kit or your computer, do not use a

25-pin SCSI port or any other connector that is

physically similar to the 25-pin parallel printer port.

5) The

MAX1618.EXE

software program can be run from

the floppy or hard drive. Use the Windows Program

Manager to run the program. If desired, you may use

the

INSTALL.EXE

program to copy the files and cre-

ate icons for them in the Windows 3.1 Program

Manager (or the Windows 95/98 Start Menu). An unin-

stall program is included with the software. Click on

the UNINSTALL icon to remove the EV kit software

from the hard drive.

6) Turn on the power supply.

7) Turn the EV kit on by moving SW1 to the ON position.

8) Start the MAX1618 program by opening its icon in

the Program Manager (or Start Menu).

9) When the program prompts you, select the correct

parallel port. An autodetect routine identifies the

port to which the EV kit is connected and selects it

as the default choice by highlighting it. Verify that

the correct port is highlighted, then select “OK.”

10) Observe as the program automatically detects the

address of the MAX1618 and starts the main pro-

gram.

Note: The MAX1618 reads the address select pins at

device power-up only.

Detailed Description

User-Interface Panel

The user interface is easy to operate; use the mouse, or

press the Tab key to navigate with the arrow keys

(Figure 1). Each of the buttons corresponds to bits in

the command and configuration bytes. Click on them to

generate the correct SMBus write operation to update

the internal registers. The program continually polls the

device for new temperature data and status, and moni-

tors for alert conditions. To change the THIGH and

TLOW alarm-threshold comparison registers, select the

appropriate data field and type in the new value. Press

Enter after typing in the new values to update the inter-

nal registers.

To make single-shot conversions, click in the Stop check

box under Configuration, then click on the Measure

Now button. Single-shot conversions can also be per-

formed while the device is autoconverting. The single-

shot command overrides the automatic conversion.

After the single shot is complete, the device returns to

automatic operation.

If an interrupt condition is generated by the temperature

crossing one of the alarm threshold levels, a message

appears in the alert box: “ALERT! INT = LOW.” To clear

the interrupt, first eliminate the condition that caused it,

then click on Read Alert. This action reads the Alert

Response address, returns the value of the current

MAX1618 slave address, and clears the interrupt.

Note: The 7 most significant bits (MSBs) are the

address. The least significant bit (LSB) is the read/write

status.

Evaluates: MAX1618

MAX1618 Evaluation System/Evaluation Kit

_______________________________________________________________________________________ 3

Figure 1. Main Display for MAX1618 EV Kit

Simple SMBus Commands

There are two methods for communicating with the

MAX1618: through the normal user-interface panel, or

through the simple SMBus commands available from

the SMBus pull-down menu. The menu lists simple

SMBus protocols, such as Read Byte and Write Byte. To

stop normal user-interface execution so that it does not

override the manually set values, turn off the update timer

that slaves the program to the conversion rate by clicking

in the Automatically Update Displays check box.

The SMBus dialog boxes accept numeric data in bina-

ry, decimal, or hexadecimal. Prefix hexadecimal num-

bers by $ or 0x. Binary numbers must be exactly eight

digits.

Note: In places where the slave address asks for an 8-

bit value, it must be the 7-bit slave address of the

MAX1618 as determined by ADD0 and ADD1, with the

last LSB bit always set to 1.

Data Logging

Data-logging commands are accessed through the

pull-down menu labeled MAX1618. Data logging saves

temperature data to a text file that includes a time/date

stamp next to each data point. Due to the high conver-

sion rate of the MAX1618, not every data point is

logged, depending on the speed of the disk drive

where the file is being written. To stop data logging,

deselect Logging from the pull-down menu.

Jumper and Switch Settings

Two jumpers set the MAX1618 slave address. The

default address is 1001 110 (ADD0 = ADD1 = VCC).

JU1 corresponds to ADD0 and JU2 corresponds to

ADD1; see Table 1 for a complete list of addresses.

The MAX1618 must undergo a power-on reset for the

new address to become effective.

The +5V supply voltage for the MAX1618 comes from

the SMBus interface board. To evaluate the MAX1618

with a different voltage, cut the trace shorting the two

pins of JU4 and apply a voltage to the pad labeled

VCC.

The MAX1618 can be placed in standby mode using

jumper JU3. See Table 2 for jumper settings.

A slide switch, SW1, is provided as a means to force a

power-on reset of the MAX1618. This switch disables

power to the device.

Evaluates: MAX1618

MAX1618 Evaluation System/Evaluation Kit

4 _______________________________________________________________________________________

SHUNT LOCATION MAX1618

ADDRESS

JU1 JU2

2–3 2–3 0011 000

Table 1. JU1 and JU2 Shunt Settings for

SMBus Address

Table 2. JU3 Shunt Settings for STBY

2–3 Open 0011 001

2–3 1–2 0011 010

Open 2–3 0101 001

Open Open 0101 010

Open 1–2 0101 011

1–2 2–3 1001 100

1–2 Open 1001 101

1–2 1–2 1001 110

SHUNT LOCATION STBY PIN FUNCTION

1–2 Connected to GND In standby mode

Open Connect an exter-

nal signal to STBY ––

2–3 Connected to VCC In operating mode

Evaluates: MAX1618

MAX1618 Evaluation System/Evaluation Kit

_______________________________________________________________________________________ 5

SMBCLK

SMBDATA

2200pF

0.1µF

ALERT

GND

VCC STBY

ADD0 ADD1

DXP

DXN

J1–5 J1–6

J1–4

J1–2

J1–12

J1–10

J1–8

J1–18

J1–20

J1–16

J1–14

J1–9

J1–7

J1–1

JU4

(SHORTED BY

PCB TRACE)

SMBCLK

J1–11

N.C.

J1–13 N.C.

N.C.

J1–15 N.C.

J1–17 N.C.

J1–19 GND

J1–3 SMBDATA

ALERT

JU1

JU2

JU3

SW1

MAX1618

STBY

DXP

DXN

SMBCLK

VCC

SMBDATA

ALERT

GND

VCC

Figure 2. MAX1618 EV Kit Schematic

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.

_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

Evaluates: MAX1618

MAX1618 Evaluation System/Evaluation Kit

TO BOARD EDGE

JU1

JU2

JU3

SW1

JU4

GND

OFF

ALERT

DXN

DXP

STBY

SMBCLK

SMBDATA

VCC

Figure 3. MAX1618 EV Kit Component Placement Guide—

Component Side

Figure 4. MAX1618 EV Kit PC Board Layout—Component Side Figure 5. MAX1618 EV Kit PC Board Layout—Solder Side

1.0"