Rainbow-electronics MAX1617A User Manual download pdf

________________General Description

The MAX1617A (patents pending) is a precise digital ther-

mometer that reports the temperature of both a remote

sensor and its own package. The remote sensor is a

diode-connected transistor—typically a low-cost, easily

mounted 2N3904 NPN type—that replaces conventional

thermistors or thermocouples. Remote accuracy is ±3°C

for multiple transistor manufacturers, with no calibration

needed. The remote channel can also measure the die

temperature of other ICs, such as microprocessors, that

contain an on-chip, diode-connected transistor.

The 2-wire serial interface accepts standard System

Management Bus (SMBus®) Write Byte, Read Byte, Send

Byte, and Receive Byte commands to program the alarm

thresholds and to read temperature data. The data format

is 7 bits plus sign, with each bit corresponding to 1°C, in

two’s complement format. Measurements can be done

automatically and autonomously, with the conversion rate

programmed by the user or programmed to operate in a

single-shot mode. The adjustable rate allows the user to

control the supply-current drain.

The MAX1617A is nearly identical to the popular MAX1617,

but has improved SMBus timing specifications, improved

bus collision immunity, software manufacturer and device

identification available via the serial interface, and a power-

on reset function that can force a reset of the slave address

via the serial interface.

________________________Applications

Desktop and Notebook Central Office

Computers Telecom Equipment

Smart Battery Packs Test and Measurement

LAN Servers Multichip Modules

Industrial Controls

____________________________Features

♦ Two Channels: Measures Both Remote and Local

Temperatures

♦ No Calibration Required

♦ SMBus 2-Wire Serial Interface

♦ Programmable Under/Overtemperature Alarms

♦ Supports SMBus Alert Response

♦ Supports Manufacturer and Device ID Codes

♦ Accuracy

±2°C (+60°C to +100°C, local)

±3°C (-40°C to +125°C, local)

±3°C (+60°C to +100°C, remote)

♦ 3µA (typ) Standby Supply Current

♦ 70µA (max) Supply Current in Auto-Convert Mode

♦ +3V to +5.5V Supply Range

♦ Small 16-Pin QSOP Package

MAX1617 A

†

Remote/Local Temperature Sensor

with SMBus Serial Interface

________________________________________________________________

Maxim Integrated Products

MAX1617A

SMBCLK

ADD0 ADD1

STBY

GND

ALERT

SMBDATA

DXP

DXN

INTERRUPT

TO µC

3V TO 5.5V

200Ω

0.1µF

CLOCK

10k EACH

DATA

2N3904

2200pF

___________________Pin Configuration

N.C. N.C.

STBY

SMBCLK

N.C.

SMBDATA

ALERT

ADD0

N.C.

TOP VIEW

MAX1617A

QSOP

DXP

ADD1

DXN

N.C.

GND

Typical Operating Circuit

19-4508; Rev 0; 1/99

PART*

MAX1617AMEE -55°C to +125°C

TEMP. RANGE PIN-PACKAGE

16 QSOP

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

Ordering Information

SMBus is a registered trademark of Intel Corp.

U.S. and foreign patents pending.

†

Patents Pending

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.

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MAX1617 A 1
MAX1617A 10

Summary of Contents

Page 1 - MAX1617 A

________________General DescriptionThe MAX1617A (patents pending) is a precise digital ther-mometer that reports the temperature of both a remotesenso

Page 2

the MAX1617A can be forced to perform A/D conver-sions via the one-shot command, despite the RUN/STOPbit being high. Activate hardware standby mode

Page 3

Alarm Threshold Registers Four registers store alarm threshold data, with high-temperature (THIGH) and low-temperature (TLOW) reg-isters for each A/D

Page 4

The Alert Response can activate several different slavedevices simultaneously, similar to the I2C™ GeneralCall. If more than one slave attempts to res

Page 5

successful read of the status byte, unless the fault per-sists. Note that the ALERT interrupt latch is not auto-matically cleared when the status flag

Page 6

MAX1617ARemote/Local Temperature Sensor with SMBus Serial Interface14 ________________________________________________________________________________

Page 7