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ADT7483AARQZ-R7 Datasheet(PDF) 1 Page - ON Semiconductor |
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ADT7483AARQZ-R7 Datasheet(HTML) 1 Page - ON Semiconductor |
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1 / 24 page  Dual Channel Temperature Sensor and Over Temperature Alarm ADT7483A ©2008 SCILLC. All rights reserved. Publication Order Number: February 2008 – Rev. 1 ADT7483A/D FEATURES 1 local and 2 remote temperature sensors 0.25°C resolution/1°C accuracy on remote channels 1°C resolution/1°C accuracy on local channel Extended, switchable temperature measurement range 0°C to 127°C (default) or –64°C to +191°C 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 16-lead QSOP package 240 μA operating current, 5 μA standby current APPLICATIONS Desktop and notebook computers Industrial controllers Smart batteries Automotive Embedded systems Burn-in applications Instrumentation GENERAL DESCRIPTION The ADT7483A1 is a three-channel digital thermometer and under/over temperature alarm, intended for use in PCs and thermal management systems. It can measure the temperature in two remote locations, for example, the remote thermal diode in a CPU or GPU, or a discrete diode connected transistor. It can also measure its own ambient temperature. The temperature of the remote thermal diode and ambient temperature can be accurately measured to ±1°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 −64°C to +191°C. The ADT7483A communicates over a 2-wire serial interface compatible with system management bus (SMBus) standards. The SMBus address is set by the ADD0 and ADD1 pins. As many as nine different SMBus addresses are possible. An ALERT output signals when the on-chip or remote temperature is outside the programmed limits. The THERM output is a comparator output that allows, for example, on/off control of a cooling fan. The ALERT output can be reconfigured as a second THERM output, if required. FUNCTIONAL BLOCK DIAGRAM 11-BIT A-TO-D CONVERTER RUN/STANDBY BUSY REMOTE 1 AND 2 TEMP OFFSET REGISTERS STATUS REGISTERS INTERRUPT MASKING CONFIGURATION REGISTERS REMOTE 1 AND 2 TEMP HIGH LIMIT REGISTERS REMOTE 1 AND 2 TEMP LOW LIMIT REGISTERS REMOTE 1 AND 2 TEMP THERM LIMIT REGISTER LOCAL TEMPERATURE HIGH LIMIT REGISTER LOCAL TEMPERATURE LOW LIMIT REGISTER LOCAL TEMPERATURE THERM LIMIT REGISTER ONE-SHOT REGISTER ADDRESS POINTER REGISTER CONVERSION RATE REGISTER REMOTE 1 AND 2 TEMP VALUE REGISTERS LOCAL TEMPERATURE VALUE REGISTER ON-CHIP TEMP SENSOR ANALOG MUX EXTERNAL DIODES OPEN-CIRCUIT SMBus INTERFACE ADT7483A 12 11 4 3 15 5 2 6 14 VDD GND SDATA SCLK THERM 13 D1+ D1– D2+ D2– ALERT/THERM2 1 16 ADD0 ADD1 Figure 1. 1 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. |
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