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ADM1027 Datasheet(PDF) 5 Page - ON Semiconductor |
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ADM1027 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 56 page REV. A ADM1027 –5– PIN FUNCTION DESCRIPTIONS Pin Mnemonic Description 1 SDA Digital I/O (Open-Drain). SMBus bidirectional serial data. Requires SMBus pull-up. 2 SCL Digital Input (Open-Drain). SMBus serial clock input. Requires SMBus pull-up. 3 GND Ground Pin for the ADM1027. 4 VCC 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 ADM1027 can also be powered from a 5 V supply. Setting Bit 7 of Configuration 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/SMBALERT Digital Output (Open-Drain). Requires 10 kW typical pull-up. Pulsewidth modulated output to control Fan 2 speed. 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/ADDRESS ENABLE Digital I/O (Open-Drain). Pulsewidth modulated output to control Fan 3 speed. Requires 10 kW typical pull-up. If pulled low on power-up, this places the ADM1027 into address select mode, and the state of Pin 14 will determine the ADM1027’s slave address. 14 TACH4/ADDRESS SELECT 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. If in address select mode, this pin determines the SMBus device address. 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. 21 12VIN Analog Input. Monitors 12 V power supply. 22 2.5VIN Analog Input. Monitors 2.5 V supply, typically a chipset voltage. 23 VCCP Analog Input. Monitors processor core voltage (0 V to 3 V). 24 PWM1/XTO Digital Output (Open-Drain). Pulsewidth modulated output to control Fan 1 speed. Requires 10 kW typical pull-up. Also functions as the output from the XOR tree in XOR test mode. Rev. 3 | Page 5 of 56 | www.onsemi.com |
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