GENERAL DESCRIPTION
The ADT7467 dBCOOLTM controller is a thermal monitor and multiple PWM fan controller for noise-sensitive or power sensitive applications requiring active system cooling. The ADT7467 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 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. A unique dynamic TMIN control mode enables the system thermals/acoustics to be intelligently managed. The effectiveness of the systems thermal solution can be monitored using the THERM input. The ADT7467 also provides critical thermal protection to the system using the bidirectional THERM pin as an output to prevent system or component overheating.

FEATURES
  Controls and monitors up to 4 fans
  High and low frequency fan drive signal
  1 on-chip and 2 remote temperature sensors
  Series resistance cancellation on the remote channel
  Extended temperature measurement range, up to 191°C
  Dynamic TMIN control mode optimizes system acoustics intelligently
  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
  2-wire, 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)