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ADM1021ARQ Datasheet(PDF) 1 Page - Analog Devices |
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ADM1021ARQ Datasheet(HTML) 1 Page - Analog Devices |
1 / 12 page REV. 0 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 ADM1021 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., 1998 Low Cost Microprocessor System Temperature Monitor FUNCTIONAL BLOCK DIAGRAM ON-CHIP TEMP. SENSOR ANALOG MUX 8-BIT A-TO-D CONVERTER LOCAL TEMPERATURE VALUE REGISTER REMOTE TEMPERATURE VALUE REGISTER BUSY RUN/STANDBY LOCAL TEMPERATURE LOW LIMIT COMPARATOR STATUS REGISTER REMOTE TEMPERATURE LOW LIMIT COMPARATOR REMOTE TEMPERATURE HIGH LIMIT COMPARATOR ADDRESS POINTER REGISTER ONE-SHOT REGISTER CONVERSION RATE REGISTER LOCAL TEMPERATURE LOW LIMIT REGISTER LOCAL TEMPERATURE HIGH LIMIT REGISTER REMOTE TEMPERATURE LOW LIMIT REGISTER LOCAL TEMPERATURE HIGH LIMIT COMPARATOR REMOTE TEMPERATURE HIGH LIMIT REGISTER CONFIGURATION REGISTER INTERRUPT MASKING EXTERNAL DIODE OPEN-CIRCUIT SMBUS INTERFACE ADM1021 TEST VDD NC GND NC NC TEST D+ D– ALERT STBY SDATA SCLK ADD0 ADD1 GND 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 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 monitoring and manage- ment. The device can measure the temperature of a micropro- cessor using a diode-connected PNP transistor, which may be provided on-chip in the case of the Pentium ® II or similar pro- cessors, 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 chan- nel measures the output of an on-chip temperature sensor, to monitor the temperature of the device and its environment. The ADM1021 communicates over a two-wire serial interface compatible with SMBus standards. Under and over temperature limits can be programmed into the devices 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 inter- rupt, or as an SMBus alert. SMBus is a trademark and Pentium is a registered trademark of Intel Corporation. |
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