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ADT7473ARQZ Datasheet(PDF) 7 Page - Analog Devices |
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ADT7473ARQZ Datasheet(HTML) 7 Page - Analog Devices |
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7 / 76 page  ADT7473 Rev. A | Page 7 of 76 PTIONS PIN CONFIGURATION AND FUNCTION DESCRI 12 11 10 9 D1– D2+ D2– TACH4/GPIO/THERM/SMBALERT 16 15 14 13 SDA PWM1/XTO VCCP D1+ 5 6 7 8 PWM2/SMBALERT TACH1 TACH2 PWM3 1 2 3 4 SCL GND VCC TACH3 ADT7473 TOP VIEW (Not to Scale) Figure 3. Pin Configuration Table 4. Pin Function Descriptions Pin No. Mnemonic Description 1 SCL Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up. 2 GND Ground Pin for the ADT7473. 3 VCC Power Supply. Powered by 3.3 V. 4 TACH3 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3. 5 PWM2 Digital Output (Open Drain). Requires 10 kΩ typical pull-up. Pulse-width modulate ontrol Fan 2 speed. y drive. d output to c Can be configured as a high or low frequenc SMBALERT Digital Output (Open Drain). Can be reconfigured as an SMBALERT interrupt output to signal out-of-limit conditions. 6 TACH1 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1. 7 TACH2 Digital I put (Open Drain). Fan tachometer input to measure speed of Fan 2. n 8 PWM3 Digital I/O (Open Drain). Pulse-width modulated output to control the speed of Fan 3 and Fan 4. Requires 10 kΩ typical pull-up. Can be configured as a high or low frequency drive. 9 TACH4 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4. GPIO General-Purpose Open Drain Digital I/O. THERM Bidirectional THERM pin. Can be used to time and monitor assertions on the THERM input as well as to assert when an ADT7473 THERM overtemperature limit is exceeded. For example, the pin 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. 10 D2− Cathode Connection to Second Thermal Diode. 11 D2+ Anode Connection to Second Thermal Diode. 12 D1− Cathode Connection to First Thermal Diode. 13 D1+ Anode Connection to First Thermal Diode. 14 oltage (0 V to 3 V). VCCP Analog Input. Monitors processor core v 15 PWM1 Digital Output (Open Drain). Pulse-width modulated output to control Fan 1 speed. Requires 10 kΩ typical pull-up. XTO Also functions as the output from the XNOR tree in XNOR test mode. 16 SDA Digital I/O (Open Drain). SMBus bidirectional serial data. Requires 10 kΩ typical pull-up. |
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