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