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ADM1021A bảng dữ liệu(PDF) 1 Page - ON Semiconductor |
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1 / 15 page © Semiconductor Components Industries, LLC, 2010 June, 2010 − Rev. 8 1 Publication Order Number: ADM1021A/D ADM1021A Low Cost Microprocessor System Temperature Monitor Microcomputer The ADM1021A is a two−channel digital thermometer and under/overtemperature 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 PNP transistor, which can be provided on−chip with 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 ADM1021A communicates over a two−wire serial interface compatible with SMBus standards. Under/overtemperature 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. FEATURES • Alternative to the ADM1021 • On−Chip and Remote Temperature Sensing • No Calibration Necessary • 1°C Accuracy for On−Chip Sensor • 3°C Accuracy for Remote Sensor • Programmable Over/Undertemperature Limits • Programmable Conversion rate • 2−Wire SMBus Serial Interface • Supports System Management Bus (SMBus) Alert • 200 mA Max Operating Current • 1 mA Standby Current • 3.0 V to 5.5 V Supply • Small 16−Lead QSOP Package APPLICATIONS • Desktop Computers • Notebook Computers • Smart Batteries • Industrial Controllers • Telecom Equipment • Instrumentation http://onsemi.com See detailed ordering and shipping information in the package dimensions section on page 14 of this data sheet. ORDERING INFORMATION xxx = Device Code # = Pb−Free Package YYWW = Date Code MARKING DIAGRAM 1 QSOP−16 CASE 492 1021AA RQZ #YYWW 1 2 3 4 5 6 7 8 ADM1021A TOP VIEW 14 13 12 11 10 9 VDD D+ D– GND ADD1 NC NC ADD0 GND NC ALERT SDATA NC 16 15 NC STBY SCLK PIN ASSIGNMENT |
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Mô tả tương tự - ADM1021A |
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