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ADM1020AR-REEL7 데이터시트(PDF) 1 Page - Analog Devices |
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ADM1020AR-REEL7 데이터시트(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 ADM1020 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., 1999 8-Lead, Low-Cost, System Temperature Monitor FUNCTIONAL BLOCK DIAGRAM LOCAL TEMPERATURE LOW LIMIT COMPARATOR LOCAL TEMPERATURE HIGH LIMIT COMPARATOR REMOTE TEMPERATURE LOW LIMIT COMPARATOR REMOTE TEMPERATURE HIGH LIMIT COMPARATOR REMOTE TEMPERATURE VALUE REGISTER LOCAL TEMPERATURE VALUE REGISTER RUN/STANDBY 8-BIT A-TO-D CONVERTER BUSY ANALOG MUX ON-CHIP TEMP. SENSOR D+ D– STATUS REGISTER LOCAL TEMPERATURE LOW LIMIT REGISTER LOCAL TEMPERATURE HIGH LIMIT REGISTER REMOTE TEMPERATURE LOW LIMIT REGISTER REMOTE TEMPERATURE HIGH LIMIT REGISTER CONFIGURATION REGISTER CONVERSION RATE REGISTER ONE-SHOT REGISTER ADDRESS POINTER REGISTER INTERRUPT MASKING ALERT ADM1020 SMBUS INTERFACE EXTERNAL DIODE OPEN-CIRCUIT VDD GND SDATA SCLK ADD PRODUCT DESCRIPTION The ADM1020 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. The device can measure the temperature of a microprocessor using a diode-connected NPN or PNP transis- tor, which may be provided on-chip in the case of the Pentium ® II or similar processors, or can be a low-cost discrete device such as the 2N3904. 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 ADM1020 communicates over a two-wire serial interface compatible with System Management Bus (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 interrupt, or as an SMBus alert. SMBus is a trademark of Intel Corporation. Pentium is a registered trademark of Intel Corporation. FEATURES 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 SMBus Alert 70 A Max Operating Current 3 A Standby Current +3 V to +5.5 V Supply 8-Lead SOIC Package APPLICATIONS Desktop Computers Notebook Computers Smart Batteries Industrial Controllers Telecommunication Equipment Instrumentation |
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