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ADT7463 Datasheet(PDF) 5 Page - ON Semiconductor |
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ADT7463 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 52 page REV. C ADT7463 –5– PIN FUNCTION DESCRIPTIONS Pin No. Mnemonic Description 1 SDA Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus. 2 SCL Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up. 3 GND Ground Pin for the ADT7463. 4VCC Power Supply. Can be powered by 3.3 V standby if monitoring in low power states is required. VCC is also monitored through this pin. The ADT7463 can also be powered from a 5 V supply. Setting Bit 7 of Configura- tion Register 1 (Reg. 0x40) rescales the VCC input attenuators to correctly measure a 5 V supply. 5 VID0 Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43). 6 VID1 Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43). 7 VID2 Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43). 8 VID3 Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43). 9 TACH3 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3. Can be reconfigured as an analog input (AIN3) to measure the speed of 2-wire fans. 10 PWM2 Digital Output (Open Drain). Requires 10 k Ω typical pull-up. Pulse-width modulated output to control FAN 2 speed. SMBALERT Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT interrupt output to signal out-of-limit conditions. 11 TACH1 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1. Can be reconfigured as an analog input (AIN1) to measure the speed of 2-wire fans. 12 TACH2 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2. Can be reconfigured as an analog input (AIN2) to measure the speed of 2-wire fans. 13 PWM3 Digital I/O (Open Drain). Pulse-width modulated output to control Fan 3/Fan 4 speed. Requires 10 k Ω typical pull-up. ADDRESS ENABLE If pulled low on power-up, this places the ADT7463 into address select mode, and the state of Pin 14 will determine the ADT7463’s slave address. 14 TACH4 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4. Can be reconfigured as an analog input (AIN4) to measure the speed of 2-wire fans. ADDRESS If in address select mode, this pin determines the SMBus device address. SELECT THERM Alternatively, the pin may be reconfigured as a bidirectional THERM pin. Can be used to time and monitor assertions on the THERM input. For example, can be connected to the PROCHOT output of Intel’s Pentium 4 processor or to the output of a trip point temperature sensor. Can be used as an output to signal overtemperature conditions. 15 D2– Cathode Connection to Second Thermal Diode. 16 D2+ Anode Connection to Second Thermal Diode. 17 D1– Cathode Connection to First Thermal Diode. 18 D1+ Anode Connection to First Thermal Diode. 19 VID4 Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43). 20 +5VIN Analog Input. Monitors 5 V power supply. THERM Alternatively, this pin may be reconfigured as a bidirectional THERM pin. Can be used to time and monitor assertions on the THERM input. For example, can be connected to the PROCHOT output of Intel’s Pentium 4 processor or to the output of a trip point temperature sensor. Can be used as an output to signal overtemperature conditions. 21 +12VIN Analog Input. Monitors 12 V power supply. VID5 Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43). Supports VRM10 solutions. 22 +2.5VIN Analog Input. Monitors 2.5 V supply, typically a chipset voltage. SMBALERT Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT interrupt output to signal out-of-limit conditions. 23 VCCP Analog Input. Monitors processor core voltage (0 V to 3 V). 24 PWM1/ Digital Output (Open Drain). Pulse-width modulated output to control Fan 1 speed. Requires 10 k Ω typical pull-up. XTO Also functions as the output from the XOR tree in XOR test mode. Rev. 4 | Page 5 of 52 | www.onsemi.com |
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