ADM1027

dB COOL Remote Thermal Controller and Voltage Monitor ADM1027* ™ FEATURES Monitors up to 5 Supply Voltages Controls and Monitors up to 4 Fan Speeds 1 On-Chip and 2 Remote Temperature Sensors Monitors up to 5 Processor VID Bits Automatic Fan Speed Control Mode Controls System Cooling Based on Measured Temperature Enhanced Acoustic Mode Dramatically Reduces User Perception of Changing Fan Speeds 2-Wire and 3-Wire Fan Speed Measurement Limit Comparison of All Monitored Values Meets SMBus 2.0 Electrical Specifications (Fully SMBus 1.1 Compliant) APPLICATIONS Low Acoustic Noise PCs Networking and Telecommunications Equipment FUNCTIONAL BLOCK DIAGRAM ADDR SELECT ADDR EN SCL SDA SMBALERT www.DataSheet4U.com GENERAL DESCRIPTION The ADM1027 dBCOOL controller is a complete systems monitor and multiple PWM fan controller for noise sensitive applications requiring active system cooling. It can monitor 12 V, 5 V, 2.5 V CPU supply voltage, 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 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. Once the control loop parameters are programmed, the ADM1027 can vary fan speed without CPU intervention. VID4 VID3 VID2 VID1 VID0 AUTOMATIC FAN SPEED CONTROL VID REGISTER SMBUS ADDRESS SELECTION SERIAL BUS INT...