Description

    The AT421, AT422, and AT423 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 AT421, AT422, and AT423 include series resistance cancellation, programmable non-ideality factor, wide remote temperature measurement range (up to +150°C), and diode fault detection.The AT421, AT422, and AT423 are all available in a SOT23-8 package. The AT421C is also available in a DSBGA (WCSP) package.

Features

SOT23-8 and DSBGA (WCSP) PACKAGES

± 1°C REMOTE DIODE SENSOR (MAX)

± 1.5°C LOCAL TEMPERATURE SENSOR (MAX)

SERIES RESISTANCE CANCELLATION

n-FACTOR CORRECTION

     TWO-WIRE/ SMBus™ SERIAL INTERFACE

MULTIPLE INTERFACE ADDRESSES

DIODE FAULT DETECTION

RoHS COMPLIANT AND NO Sb/Br

APPLICATIONS

PROCESSOR/FPGA TEMPERATURE

MONITORING

LCD/ DLP® /LCOS PROJECTORS

SERVERS

CENTRAL OFFICE TELECOM EQUIPMENT

STORAGE AREA NETWORKS (SAN)

Diagram