Is it possible to use ADT7470 without the TMP05/06 temperature sensor? If so, how is this implemented?
The ADT7470 powers up in manual fan control mode, with all PWM duty cycles set to 100%.The configuration registers determines whether the fans operate in manual control mode (non-temperature sensor dependent for fan control) or in automatic fan control mode (temperature sensor dependent)
In manual mode, pin 13 is an unused input pin and should be connected to a 10k pull-up resistor to Vdd. Pin 12 is also an unused input and can either be connected to a 10k pull-up resistor to Vdd or connected directly to GND.
In the absence of a temperature sensor to control the duty cycle of the PWM outputs and hence the fan speed, PWM duty cycle registers 0x32, 0x33, 0x34 and 0x35 need to be programmed manually. The PWM duty cycle for each PWM output can be set anywhere from 0 to 100% in steps of 0.39%.
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