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ADT7460ARQ-REEL Datasheet(PDF) 8 Page - ON Semiconductor |
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ADT7460ARQ-REEL Datasheet(HTML) 8 Page - ON Semiconductor |
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8 / 47 page  ADT7460 http://onsemi.com 8 Product Description The ADT7460 is a thermal monitor and multiple fan controller for any system requiring monitoring and cooling. The device communicates with the system via a serial System Management Bus (SMBus). The serial bus controller has an optional address line for device selection (Pin 9), a serial data line for reading and writing addresses and data (Pin 16), and an input line for the serial clock (Pin 1). All control and programming functions of the ADT7460 are performed over the serial bus. In addition, two of the pins can be reconfigured as an SMBALERT output to indicate out-of-limit conditions. Measurement Inputs The device has three measurement inputs, one for voltage and two for temperature. It can also measure its own supply voltage and can measure ambient temperature with its on-chip temperature sensor. Pin 14 is an analog input with an on-chip attenuator and is configured to monitor 2.5 V. Power is supplied to the chip via Pin 3, and the system also monitors VCC through this pin. In PCs, this pin is normally connected to a 3.3 V standby supply. This pin can, however, be connected to a 5.0 V supply and monitor it without over-ranging. Remote temperature sensing is provided by the D1 ± and D2 ± inputs, to which diode-connected, external temperature-sensing transistors, such as a 2N3904 or CPU thermal diode, may be connected. The ADC also accepts input from an on-chip band gap temperature sensor, which monitors system ambient temperature. Sequential Measurement When the ADT7460 monitoring sequence is started, it cycles sequentially through the measurement of 2.5 V input and the temperature sensors. Measured values from these inputs are stored in value registers. These can be read out over the serial bus or can be compared with programmed limits stored in the limit registers. The results of out-of-limit comparisons are stored in the status registers, which can be read over the serial bus to flag out-of-limit conditions. Recommended Implementation Configuring the ADT7460 as in Figure 12 allows the systems designer the following features: • Two PWM Outputs for Fan Control of Up to Three Fans (the Front and Rear Chassis Fans are Connected in Parallel) • Three TACH Fan Speed Measurement Inputs • VCC Measured Internally Through Pin 3 • CPU Temperature Measured Using Remote 1 Temperature Channel • Ambient Temperature Measured Through Remote 2 Temperature Channel • Bidirectional THERM Pin. Allows Intel® Pentium® 4 PROCHOT Monitoring and Can Function as an Overtemperature THERM Output • SMBALERT System Interrupt Output Figure 12. Recommended Implementation AMBIENT TEMPERATURE FRONT CHASSIS FAN REAR CHASSIS FAN GND ADT7460 PWM1 TACH1 D2+ D2− THERM SDA SCL SMBALERT TACH2 PWM3 TACH3 D1+ D1− CPU FAN CPU ICH PROCHOT |
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