THMC10 Datasheet, PDF (1/20 Pages) Texas Instruments – REMOTE/LOCAL TEMPERATURE MONITOR WITH SMBus INTERFACE

D Two-Wire SMBus Serial Interface
D On-Chip and External Diode-Connected
Transistor Temperature Monitoring
– ±2.5°C Accuracy for On-Die
– ±3°C Accuracy for External
D Programmable Under/Overtemperature
Limits
D Under/Overtemperature Interrupt Signal to
Host Controller
D Low Operating Current . . . 35 µA (Average)
D Low Standby Current . . . 3 µA
D 3-V to 3.6-V Supply Voltage Range
THMC10
REMOTE/LOCAL TEMPERATURE MONITOR
WITH SMBus INTERFACE
SLIS089 – DECEMBER 1999
SSOP DBQ Package
(TOP VIEW)
N/C
V_DD
DXP
DXN
N/C
ADD1
GND
GND
1
16
2
15
3
14
4 _THMC10 13
5
12
6
11
7
10
8
9
N/C
STBY
SCLK
N/C
SDATA
ALERT
ADD0
N/C
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
diode-connected transistor on the microprocessor die, such as the one present on the Intel^® Pentium^® II, III,
and the Sun^® UltraSPARC™. 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
the absolute value of the remote transistor’s V_BE; therefore, no calibration is needed. The second channel
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
sensor connection or if the sensor connection is shorted to V_DD.
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.
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.
Copyright © 1999, Texas Instruments Incorporated
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