THMC10

REMOTE/LOCAL TEMPERATURE MONITOR

WITH SMBus INTERFACE

SLIS089 – DECEMBER 1999

1

POST OFFICE BOX 655303

Transistor Temperature Monitoring

–

±2.5°C Accuracy for On-Die

–

±3°C Accuracy for External

Limits

Host Controller

description

The THMC10 is a dual digital temperature monitor with under/overtemperature alerts intended for use in

personal computer systems or any other system requiring local as well as remote temperature monitoring and

management (e.g., servers and workstations). The device may be used in smart battery applications and

memory modules. The device is designed to measure the temperature on a microprocessor using a

™. The device may also be used with a low-cost, diode-connected, discrete transistor,

such as a 2N3904 or 2N3906, for remote temperature sensing applications.

The THMC10 uses a two-current measurement technique on a single diode-connected transistor that cancels

measures an on-chip temperature sensor which can be used to monitor the ambient temperature in the

THMC10’s operating environment.

The THMC10 uses a two-wire, SMBus interface to report temperature in an 8-bit, 2s complement format in

°C.

Under/overtemperature limits for both the on-chip and remote temperature sensors are user programmable via

the SMBus interface. The ALERT terminal can be used as an interrupt or SMBus alert function to indicate

under/overtemperature. The STBY terminal and the

start/stop bit in the SMBus interface allow the device to

enter a low current standby mode (typically <10

µA).

The THMC10 also provides diagnostics via the ALERT terminal and the SMBus interface for an open remote

Copyright

© 1999, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

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.

Intel and Pentium are registered trademarks of Intel Corporation.

Sun is a registered trademark and UltraSPARC is a trademark of Sun Microsystems.

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N/C

DXP

DXN

N/C

ADD1

GND

GND

N/C

STBY

SCLK

N/C

SDATA

ALERT

ADD0

N/C

SSOP DBQ Package

(TOP VIEW)

THMC10