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ADT7476 Datasheet(PDF) 7 Page - Analog Devices |
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ADT7476 Datasheet(HTML) 7 Page - Analog Devices |
7 / 72 page ADT7476 Rev. A | Page 7 of 72 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 20 19 18 17 16 15 14 13 +5VIN VID4/GPIO4 D1+ D1– 24 23 22 21 PWM1/XTO VCCP +2.5VIN/THERM +12VIN/VID5 D2+ D2– PWM3/ADDREN TACH4/THERM/SMBALERT/GPIO6/ADDR SELECT 5 6 7 8 9 10 11 12 VID0/GPIO0 VID1/GPIO1 VID2/GPIO2 VID3/GPIO3 TACH1 TACH2 TACH3 PWM2/SMBALERT 1 2 3 4 SDA SCL GND VCC ADT7476 TOP VIEW (Not to Scale) Figure 3. Pin Configuration Table 4. Pin Function Descriptions Pin No. 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. 4 VCC Power Supply. Powered by 3.3 V standby, if monitoring in low power states is required. VCC is also monitored through this pin. 5 VID0 Digital Input. Voltage supply readouts from CPU. This value is read into the VID register (0x43). GPIO0 General-Purpose Open-Drain Digital I/O. 6 VID1 Digital Input. Voltage supply readouts from CPU. This value is read into the VID register (0x43). GPIO1 General-Purpose Open-Drain Digital I/O. 7 VID2 Digital Input. Voltage supply readouts from CPU. This value is read into the VID register (0x43). GPIO2 General-Purpose Open-Drain Digital I/O. 8 VID3 Digital Input. Voltage supply readouts from CPU. This value is read into the VID register (0x43). GPIO3 General-Purpose Open-Drain Digital I/O. 9 TACH3 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3. 10 PWM2 Digital Output (Open Drain). Requires 10 kΩ typical pull-up. Pulse-width modulated output to control Fan 2 speed. Can be configured as a high or low frequency drive. SMBALERT Digital Output (Open Drain). This pin can 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. 12 TACH2 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2. 13 PWM3 Digital I/O (Open Drain). Pulse-width modulated output to control Fan 3 and Fan 4 speed. Requires 10 kΩ typical pull-up. Can be configured as a high or low frequency drive. ADDREN If pulled low on power-up, the ADT7476 enters address select mode, and the state of Pin 14 (ADDR SELECT) determines the ADT7476 slave address. 14 TACH4 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4. THERM Alternatively, the pin can be reconfigured as a bidirectional THERM pin. Use to time and monitor assertions on the THERM input. For example, can be connected to the PROCHOT output of an Intel Pentium 4 processor or to the output of a trip point temperature sensor. Can be used as an output to signal overtemperature conditions. SMBALERT Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output to signal out-of- limit conditions. GPIO6 General-Purpose Open-Drain Digital I/O. ADDR SELECT If in address select mode, the logic state of this pin defines the SMBus device address. 15 D2– Cathode Connection to Second Thermal Diode. |
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