+5V

SCL

GND

SDA

V+

SMBus

Controller

8

5

7

6

TMP421

DXP

DXN

A1

A0

1

2

3

4

1ChannelLocal

1ChannelRemote

TMP422

DX1

DX2

DX3

DX4

1

2

3

4

1ChannelLocal

2ChannelsRemote

TMP423

DXP1

DXP2

DXP3

DXN

1

2

3

4

1ChannelLocal

3ChannelsRemote

TMP421

TMP422

TMP423

www.ti.com

SBOS398C – JULY 2007 – REVISED MAY 2012

±1°C Remote and Local TEMPERATURE SENSOR

Check for Samples: TMP421, TMP422, TMP423

1

FEATURES

DESCRIPTION

The TMP421, TMP422, and TMP423 are remote

234

•

SOT23-8 and DSBGA (WCSP) PACKAGES

temperature sensor monitors with a built-in local

•

±1°C REMOTE DIODE SENSOR (MAX)

temperature sensor. The remote temperature sensor

•

±1.5°C LOCAL TEMPERATURE SENSOR (MAX)

diode-connected transistors are typically low-cost,

NPN- or PNP-type transistors or diodes that are an

•

SERIES RESISTANCE CANCELLATION

integral part of microcontrollers, microprocessors, or

•

n-FACTOR CORRECTION

FPGAs.

•

TWO-WIRE/ SMBus™ SERIAL INTERFACE

Remote

accuracy

is

±1°C

for

multiple

IC

•

MULTIPLE INTERFACE ADDRESSES

manufacturers, with no calibration needed. The two-

•

DIODE FAULT DETECTION

wire serial interface accepts SMBus write byte, read

byte, send byte, and receive byte commands to

•

RoHS COMPLIANT AND NO Sb/Br

configure the device.

APPLICATIONS

The TMP421, TMP422, and TMP423 include series

resistance cancellation, programmable non-ideality

•

PROCESSOR/FPGA TEMPERATURE

factor, wide remote temperature measurement range

MONITORING

(up to +150°C), and diode fault detection.

•

The TMP421, TMP422, and TMP423 are all available

•

SERVERS

in a SOT23-8 package. The TMP421C is also

•

CENTRAL OFFICE TELECOM EQUIPMENT

available in a DSBGA (WCSP) package.

•

STORAGE AREA NETWORKS (SAN)

1

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.

2

DLP is a registered trademark of Texas Instruments.

3

SMBus is a trademark of Intel Corporation.

4

All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2007–2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.