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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.

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