TMP421| Datasheet

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TMP421 TMP422 TMP423
SBOS398B JULY 2007 REVISED MARCH 2008

1 C Remote and Local TEMPERATURE SENSOR in SOT23-8
1

FEATURES
SOT23-8 PACKAGE 1 C REMOTE DIODE SENSOR (MAX) 1.5 C LOCAL TEMPERATURE SENSOR (MAX) SERIES RESISTANCE CANCELLATION n-FACTOR CORRECTION TWO-WIRE/SMBusTM SERIAL INTERFACE MULTIPLE INTERFACE ADDRESSES DIODE FAULT DETECTION RoHS COMPLIANT AND NO Sb/Br

DESCRIPTION
The TMP421, TMP422, and TMP423 are remote temperature sensor monitors with a built-in local temperature sensor. The remote temperature sensor diode-connected transistors are typically low-cost, NPN- or PNP-type transistors or diodes that are an integral part of microcontrollers, microprocessors, or FPGAs. Remote accuracy is 1 C for multiple IC manufacturers, with no calibration needed. The two-wire serial interface accepts SMBus write byte, read byte, send byte, and receive byte commands to configure the device. The TMP421, TMP422, and TMP423 include series resistance cancellation, programmable non-ideality factor, wide remote temperature measurement range (up to +150 C), and diode fault detection. The TMP421, TMP422, and TMP423 are all available in a SOT23-8 package.

234

APPLICATIONS
PROCESSOR/FPGA TEMPERATURE MONITORING LCD/DLP /LCOS PROJECTORS SERVERS CENTRAL OFFICE TELECOM EQUIPMENT STORAGE AREA NETWORKS (SAN)

+5V

TMP421
1

TMP422
1

TMP423
1 8 V+

DXP
2 2

DX1
2

DXP1 DXP2
3

SCL SDA

7 6 SMBus Controller

DXN
3

DX2
3

A1
4

DX3 A0
4 4

DXP3 DXN
GND 5

DX4

1 Channel Local 1 Channel Remote

1 Channel Local 2 Channels Remote

1 Channel Local 3 Channels Remote

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. DLP is a registered trademark of Texas Instruments. SMBus is a trademark of Intel Corporation. All other trademarks are the property of their respective owners.
Copyright 2007 2008, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.