GENERAL DESCRIPTION

The ADT7475 dBCool controller is a thermal monitor and multiple PWM fan controller for noise-sensitive or power sensitive applications requiring active system cooling. The ADT7475 can drive a fan using either a low or high frequency drive signal, monitor the temperature of up to two remote sensor diodes plus its own internal temperature, and measure and control the speed of up to four fans, so they operate at the lowest possible speed for minimum acoustic noise.

FEATURES

Controls and monitors up to 4 fans

High and low frequency fan drive signal

1 on-chip and 2 remote temperature sensors

Extended temperature measurement range, up to 191°C

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 THERM input

3-wire and 4-wire fan speed measurement

Limit comparison of all monitored values

Meets SMBus 2.0 electrical specifications (fully SMBus 1.1 compliant)

Fully RoHS compliant