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ADM1021 Datasheet Low Cost Microprocessor System Temperature Monitor

Manufacturer: Analog Devices

Overview: a.

General Description

The ADM1021 is a two-channel digital thermometer and under/ over temperature alarm, intended for use in personal puters and other systems requiring thermal monitoring and management.

The device can measure the temperature of a microprocessor using a diode-connected PNP transistor, which may be provided on-chip in the case of the Pentium® II or similar processors, or can be a low cost discrete NPN/PNP device such as the 2N3904/2N3906.

A novel measurement technique cancels out the absolute value of the transistor’s base emitter voltage, so that no calibration is required.

Key Features

  • Improved Replacement for MAX1617 On-Chip and Remote Temperature Sensing No Calibration Necessary 1؇ C Accuracy for On-Chip Sensor 3؇ C Accuracy for Remote Sensor Programmable Over/Under Temperature Limits Programmable Conversion Rate 2-Wire SMBus Serial Interface Supports System Management Bus (SMBus™) Alert 70 ␮A Max Operating Current 3 ␮ A Standby Current 3 V to 5.5 V Supply Small 16-Lead QSOP Package.

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