This part is a kind of semiconductor called ADM1021.

Function of this product has Low Cost Microprocessor System Temperature Monitor.

Manufacturers : Analog Devices

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Some of the text within the PDF file :

a 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 APPLICATIONS Desktop Computers Notebook Computers Smart Batteries Industrial Controllers Telecomms Equipment Instrumentation Low Cost Microprocessor System Temperature Monitor ADM1021 PRODUCT DESCRIPTION The ADM1021 is a two-channel digital thermometer and under/ over temperature alarm, intended for use in personal computers and other systems requiring thermal monitorin [ ... ]

ADM1021 PDF Datasheet Download