ADT7476AARQZ-RL7 ON Semiconductor

ADT7476A Remote Thermal Controller and Voltage Monitor The ADT7476A controller is a thermal monitor and multiple PWM fan controller for noise-sensitive or power-sensitive applications requiring active system cooling. The ADT7476A can drive a fan using ADT7476A ADDR ADDREN SELECT SCL SDA SMBALERT ADT7476A VID5/GPIO5 VID4/GPIO4 SMBus VID3/GPIO3 SERIAL BUS VID/GPIO ADDRESS VID2/GPIO2 INTERFACE REGISTER SELECTION VID1/GPIO1 VID0/GPIO0 ADDRESS GPIO6 POINTER REGISTER PWM1 PWM REGISTERS AUTOMATIC PWM2 AND CONTROLLERS FAN SPEED PWM (HF AND LF) CONTROL PWM3 CONFIGURATION REGISTERS TACH1 TACH2 FAN SPEED INTERRUPT COUNTER TACH3 MASKING TACH4 PERFORMANCE MONITORING THERMAL THERM INTERRUPT PROTECTION STATUS V TO ADT7476A CC REGISTERS ACOUSTIC V CC ENHANCEMENT D1+ CONTROL LIMIT D1 COMPARATORS INPUT D2+ SIGNAL 10-BIT D2 CONDITIONING ADC +5V IN VALUE AND AND +12V LIMIT IN ANALOG REGISTERS +2.5V MULTIPLEXER IN BAND GAP V CCP REFERENCE BAND GAP TEMP. SENSOR GND Figure 1. Functional Block Diagram t F t LOW t HD STA t R SCL t t HD STA HIGH t t SU STA SU STO t t SU DAT HD DAT SDA t BUF S PS P Figure 2. Serial Bus Timing Diagram