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ADT7473ARQZ-REEL Datasheet(PDF) 3 Page - ON Semiconductor |
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ADT7473ARQZ-REEL Datasheet(HTML) 3 Page - ON Semiconductor |
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3 / 73 page  ADT7473 www.onsemi.com 3 Table 2. THERMAL CHARACTERISTICS Package Type qJA qJC Unit 16-lead QSOP 150 39 °C/W NOTE: qJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 3. PIN ASSIGNMENT Pin No. Mnemonic Description 1 SCL Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pullup. 2 GND Ground Pin. 3 VCC Power Supply. Powered by 3.3 V. 4 TACH3 ADDR SELECT Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3. If in address select mode, the logic state of this pin defines the SMBus device address. 5 PWM2 SMBALERT THERM_LATCH Digital Output (Open Drain). ADT7473 default pin function is PWM2. Requires 10 k W typical pullup. Pulse-width modulated output to control Fan 2 speed. Can be configured as a high or low frequency drive. On the ADT7473, this pin can be reconfigured as an SMBALERT interrupt output to signal out-of-limit conditions. ADT7473−1 default pin function. THERM_LATCH is a thermal event alert signal when an overtemperature condition occurs. 6 TACH1 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1. 7 TACH2 Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2. 8 PWM3 ADDREN Digital I/O (Open Drain). Pulse-width modulated output to control the speed of Fan 3 and Fan 4. Requires 10 k W typical pullup. Can be configured as a high or low frequency drive. If pulled low on powerup, the ADT7473−1 enters address select mode, and the state of Pin 4 (ADDR SELECT) determines the ADT7473−1 slave address. 9 TACH4 GPIO THERM SMBALERT Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4. General Purpose Open Drain Digital I/O. 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 IntelR PentiumR 4 processor or to the output of a trip point temperature sensor. Can be used as an output to signal overtemperature conditions. 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 VCCP Analog Input. Monitors processor core voltage (0 V to 3.0 V). 15 PWM1 XTO Digital Output (Open Drain). Pulse-width modulated output to control Fan 1 speed. Requires 10 k W typical pullup. 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 k W typical pullup. |
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