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ADT7460 Datasheet(PDF) 3 Page - ON Semiconductor |
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ADT7460 Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 47 page ADT7460 http://onsemi.com 3 Table 2. THERMAL CHARACTERISTICS Package Type qJA qJC Unit 16-lead QSOP 150 39 °C/W 1. 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 for the ADT7460. 3 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 ADT7460 can also be powered from a 5.0 V supply. Setting Bit 7 of Configuration Register 1 (Reg. 0x40) rescales the VCC input attenuators to correctly measure a 5.0 V supply. 4 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. 5 PWM2 Digital Output (Open-Drain). Requires 10 kW typical pullup. 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. 6 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. 7 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. 8 PWM3 Digital I/O (Open-Drain). Pulse-width modulated output to control Fan 3/4 speed. Requires 10 kW typical pullup. ADDRESS ENABLE If pulled low on powerup, this places the ADT7460 into address select mode, and the state of Pin 9 determines the ADT7460’s slave address. 9 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 SELECT If in address select mode, this pin determines the SMBus device address. 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. 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 +2.5 VIN 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. 15 PWM1/XTO Digital Output (Open-Drain). Pulse-width modulated output to control Fan 1 speed. Requires 10 kW typical pullup. 16 SDA Digital I/O (Open-Drain). SMBus bidirectional serial data. Requires SMBus pullup. |
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