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MAX6642

±1°C, SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm

Maxim Integrated 

EVALUATION KIT AVAILABLE

MAX6642

±1°C, SMBus-Compatible Remote/

Local Temperature Sensor with

Overtemperature Alarm

General Description

The MAX6642 precise, two-channel digital temperature

sensor accurately measures the temperature of its own

die and a remote PN junction and reports the tempera-

ture data over a 2-wire serial interface. The remote PN

junction is typically a substrate PNP transistor on the

die of a CPU, ASIC, GPU, or FPGA. The remote PN

junction can also be a discrete diode-connected small-

signal transistor.

The 2-wire serial interface accepts standard system

management bus (SMBus™), Write Byte, Read Byte,

Send Byte, and Receive Byte commands to read the

temperature data and to program the alarm thresholds.

To enhance system reliability, the MAX6642 includes an

SMBus timeout. The temperature data format is 10 bit

with the least significant bit (LSB) corresponding to

+0.25°C. The ALERT output asserts when the local or

remote overtemperature thresholds are violated. A fault

queue may be used to prevent the ALERT output from

setting until two consecutive faults have been detected.

Measurements can be done autonomously or in a sin-

gle-shot mode.

Remote accuracy is ±1°C maximum error between

+60°C and +100°C. The MAX6642 operates from -40°C

to +125°C, and measures remote temperatures

between 0°C and +150°C. The MAX6642 is available in

a 6-pin TDFN package with an exposed pad.

Applications

Desktop Computers

Notebook Computers

Servers

Thin Clients

Test and Measurement

Workstations

Graphic Cards

Selector Guide

PART

MEASURED TEMP RANGE

MAX6642ATT90-T

0°C to +150°C

MAX6642ATT92-T

0°C to +150°C

MAX6642ATT94-T

0°C to +150°C

MAX6642ATT96-T

0°C to +150°C

MAX6642ATT98-T

0°C to +150°C

MAX6642ATT9A-T

0°C to +150°C

MAX6642ATT9C-T

0°C to +150°C

MAX6642ATT9E-T

0°C to +150°C

SMBus is a trademark of Intel Corp.

TOP

MARK

AFC

AFD

AFE

AFF

AEW

AFG

AFH

AFI

Benefits and Features

• Integrated Temperature Sensor Enables Simultaneous

Dual Temperature (Remote and Local) Measurements

• Remote Accuracy ±1°C

• Local Accuracy ±2°C from +60°C to +100°C

• Measures Remote Temperature up to +150°C

• 0.25°C Resolution

• Dual Zone Monitoring Automates Over-Temperature

Alarms

• Programmable Remote/Local Temperature

Thresholds

• ALERT Output

• Small Footprint

• 3mm x 3mm TDFN Package with Exposed Pad

• Low Thermal Mass Reduces Measurement Latency

• SMBus/I2C Address Hardwired

Ordering Information

PART

MAX6642ATT90-T

MAX6642ATT92-T

MAX6642ATT94-T

MAX6642ATT96-T

MAX6642ATT98-T

MAX6642ATT9A-T

MAX6642ATT9C-T

MAX6642ATT9E-T

T = Tape and reel.

*EP = Exposed pad.

TEMP RANGE

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

PIN-PACKAGE

6 TDFN-EP*

6 TDFN-EP*

6 TDFN-EP*

6 TDFN-EP*

6 TDFN-EP*

6 TDFN-EP*

6 TDFN-EP*

6 TDFN-EP*

Pin Configuration and Functional Diagram appear at end of

data sheet.

Typical Operating Circuit

0.1µF

3.3V

47Ω

VCC

2200pF

MAX6642

DXP

SDA

SCLK

ALERT

µP

GND

10kΩ EACH

DATA

CLOCK

INTERRUPT TO µP

19-2920; Rev 5; 11/15

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