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ADM1023 Arkusz danych(PDF) 1 Page - Analog Devices |
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ADM1023 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 12 page REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a ADM1023* One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 FUNCTIONAL BLOCK DIAGRAM ACPI-Compliant High-Accuracy Microprocessor System Temperature Monitor 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 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-con- nected 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 tem- perature of the device and its environment. The ADM1023 communicates over a 2-wire serial interface compatible with SMBus standards. Under and over tempera- ture 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. *Patents pending. Pentium is a registered trademark of Intel Corporation. ON-CHIP TEMPERATURE SENSOR A-TO-D CONVERTER BUSY RUN/STANDBY EXTERNAL DIODE OPEN-CIRCUIT ADDRESS POINTER REGISTER ONE-SHOT REGISTER CONVERSION RATE REGISTER OFFSET REGISTERS REMOTE TEMPERATURE HIGH-LIMIT REGISTERS CONFIGURATION REGISTER INTERRUPT MASKING SMBUS INTERFACE LOCAL TEMPERATURE LOW-LIMIT COMPARATOR LOCAL TEMPERATURE HIGH-LIMIT COMPARATOR REMOTE TEMPERATURE LOW-LIMIT COMPARATOR REMOTE TEMPERATURE HIGH-LIMIT COMPARATOR REMOTE TEMPERATURE VALUE REGISTERS LOCAL TEMPERATURE VALUE REGISTER STATUS REGISTER NC VDD GND NC GND NC NC NC SDATA SCLK ADD0 ADD1 ALERT STBY D+ D– REMOTE TEMPERATURE LOW-LIMIT REGISTERS LOCAL TEMPERATURE HIGH-LIMIT REGISTER LOCAL TEMPERATURE LOW-LIMIT REGISTER ANALOG MUX NC = NO CONNECT ADM1023 |
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