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EVAL-ADT7466EB Datasheet(PDF) 1 Page - ON Semiconductor |
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EVAL-ADT7466EB Datasheet(HTML) 1 Page - ON Semiconductor |
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1 / 48 page  dBCool® Remote Thermal Controller and Voltage Monitor ADT7466 ©2010 SCILLC. All rights reserved. Publication Order Number: May 2010 – Rev. 3 ADT7466/D FEATURES Monitors two analog voltages or thermistor temperature inputs One on-chip and up to two remote temperature sensors with series resistance cancellation Controls and monitors the speed of up to two fans Automatic fan speed control mode controls system cooling based on measured temperature Enhanced acoustic mode dramatically reduces user perception of changing fan speeds Thermal protection feature via THERM output monitors performance impact of Intel® Pentium® 4 processor thermal control circuit via PROCHOT input 3-wire fan speed measurement Limit comparison of all monitored values SMBus 1.1 serial interface APPLICATIONS Low acoustic noise notebook PCs GENERAL DESCRIPTION The ADT7466 dBCool controller is a complete thermal monitor and dual fan controller for noise-sensitive applications requiring active system cooling. It can monitor two analog voltages or the temperature of two thermistors, plus its own supply voltage. It can monitor the temperature of up to two remote sensor diodes, plus its own internal temperature. It can measure and control the speed of up to two fans so that they operate at the lowest possible speed for minimum acoustic noise. The automatic fan speed control loop optimizes fan speed for a given temperature. The effectiveness of the system’s thermal solution can be monitored using the PROCHOT input to time and monitor the PROCHOT output of the processor. FUNCTIONAL BLOCK DIAGRAM SERIAL BUS INTERFACE CONFIGURATION REGISTERS THERM REGISTER INTERRUPT MASKING ADDRESS POINTER REGISTER INTERRUPT STATUS REGISTERS VALUE AND LIMIT REGISTERS ACOUSTIC ENHANCEMENT CONTROL AUTOMATIC FAN SPEED CONTROL LIMIT COMPARATORS FAN SPEED MONITOR V_FAN_MIN V_FAN_ON CONTROL 8-BIT DAC 8-BIT DAC VCC GND REFOUT SCL SDA ALERT BAND GAP REFERENCE 10-BIT ADC DRIVE1 DRIVE2 TACH1 TACH2 FANLOCK FAN1_ON/ PROCHOT/ THERM D1+ D1– AIN1/TH1/D2– AIN2/TH2/D2+ SERIES RESISTANCE CANCELLATION BAND GAP TEMPERATURE SENSOR SERIES RESISTANCE CANCELLATION INPUT SIGNAL CONDITIONING AND ANALOG MULTIPLEXER FAN1 ENABLE PROCHOT ADT7466 Figure 1. Protected by U.S. Patent Numbers 6,188,189; 6,169,442; 6,097,239; 5,982,221; 5,867,012. |
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