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ADM1023

Analog Devices
Part Number ADM1023
Manufacturer Analog Devices
Description ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor
Published Mar 23, 2005
Detailed Description a FEATURES Next Generation Upgrade to ADM1021 On-Chip and Remote Temperature Sensing Offset Registers for System Calibra...
Datasheet PDF File ADM1023 PDF File

ADM1023
ADM1023

Overview
a FEATURES Next Generation Upgrade to ADM1021 On-Chip and Remote Temperature Sensing Offset Registers for System Calibration 1 ؇ C Accuracy and Resolution on Local Channel 0.
125؇ C Resolution/1؇ C Accuracy on Remote Channel Programmable Over/Under Temperature Limits Programmable Conversion Rate Supports System Management Bus (SMBus) Alert 2-Wire SMBus Serial Interface 200 ␮A Max Operating Current (0.
25 Conversions/ Seconds) 1 ␮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 ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor ADM1023* PRODUCT DESCRIPTION The ADM1023 is a two-channel digital thermometer and under/ over temperature alarm, intended for use in personal computers and other systems requiring thermal monitoring and management.
Optimized for the Pentium® III; the higher accuracy offered allows systems designers to safely reduce temperature guard banding and increase system performance.
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 III 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.
The second measurement channel measures the output of an on-chip temperature sensor, to monitor the temperature of the device and its environment.
The ADM1023 communicates over a 2-wire serial interface compatible with SMBus standards.
Under and over temperature limits can be programmed into the device over the serial bus, and an ALERT output signals when the on-chip or remote temperature is out of range.
This output can be used as an interrupt, or as an SMBus alert.
FUNCTIONAL BLOCK DIAGRAM ADDRESS POINTER REGISTER ONE-SHOT REGI...


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