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ADT7461AR 数据表(PDF) 1 Page - Analog Devices |
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ADT7461AR 数据表(HTML) 1 Page - Analog Devices |
1 / 24 page ±1°C Temperature Monitor with Series Resistance Cancellation ADT7461* FEATURES On-chip and remote temperature sensor 0.25°C resolution/1°C accuracy on remote channel 1°C resolution/3°C accuracy on local channel Automatically cancels up to 3 kΩ (typ) of resistance in series with remote diode to allow noise filtering Extended, switchable temperature measurement range 0°C to +127°C (default) or –55°C to +150°C Pin and register compatible with ADM1032 2-wire SMBus serial interface with SMBus alert support Programmable over/under temperature limits Offset registers for system calibration Up to 2 overtemperature fail-safe THERM outputs Small 8-lead SOIC or MSOP package 170 µA operating current, 5.5 µA standby current APPLICATIONS Desktop and notebook computers Industrial controllers Smart batteries Automotive Enbedded systems Burn-in applications Instrumentation PRODUCT DESCRIPTION The ADT7461 is a dual-channel digital thermometer and under/over temperature alarm, intended for use in PCs and thermal management systems. It is pin and register compatible with the ADM1032. The ADT7461 has three additional features: series resistance cancellation, where up to 3 kΩ (typical) of resistance in series with the temperature monitoring diode may be automatically cancelled from the temperature result, allowing noise filtering; configurable ALERT output; and an extended, switchable temperature measurement range. The ADT7461 can measure the temperature of a remote ther- mal diode accurate to ±1°C, and the ambient temperature accu- rate to ±3°C. The temperature measurement range defaults to 0°C to +127°C, compatible with ADM1032, but can be switched to a wider measurement range, from −55°C to +150°C. The ADT7461 communicates over a 2-wire serial interface compati- ble with system management bus (SMBus) standards. An ALERT output signals when the on-chip or remote temperature is out of range. The THERM output is a comparator output that allows on/off control of a cooling fan. The ALERT output can be reconfigured as a second THERM output if required. *Protected by U.S. Patents 5,195,827; 5,867,012; 5,982,221; 6,097,239; 6,133,753; 6,169,442; other patents pending. SCLK SDATA GND VDD 6 4 ADDRESS POINTER REGISTER LOCAL TEMPERATURE LOW LIMIT REGISTER LOCAL TEMPERATURE HIGH LIMIT REGISTER REMOTE TEMPERATURE LOW LIMIT REGISTER REMOTE TEMPERATURE HIGH LIMIT REGISTER LOCAL TEMPERATURE VALUE REGISTER REMOTE TEMPERATURE VALUE REGISTER ADC ANALOG MUX ON-CHIP TEMPERATURE SENSOR RUN/STANDBY BUSY REMOTE OFFSET REGISTER EXTERNAL DIODE OPEN-CIRCUIT ADT7461 STATUS REGISTER SMBus INTERFACE LOCAL THERM LIMIT REGISTER EXTERNAL THERM LIMIT REGISTER CONFIGURATION REGISTER INTERRUPT MASKING 7 5 1 8 THERM ALERT/ THERM2 D+ D– SRC BLOCK 2 3 CONVERSION RATE REGISTER Figure 1. Functional Block Diagram 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 that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 © 2003 Analog Devices, Inc. All rights reserved. Rev. 0 |
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类似说明 - ADT7461AR |
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