Upboard fan control

Sahaj Sarup

I have the fan heatsink, i want to use the up-board for a NAS drive and since it has a fan I am worried about 24 7 operation and damaging the fan. Is there a way to controll the fan switching on and off based on cpu temps?

Aling

The fan is always on, because we can not find such a small fan with 3 pin ( power, ground, PWM).

Sahaj Sarup

what about simple on off via gpio

Aling

After checking with our engineer, here is some feedback.
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We use the GPIO pin to control the FAN VCC ON or OFF , , when boot up this pin is high level , when power down this pin is low level .

Michael Miller

on the block diagram it says the fan connector is connected to a PWM. I know you can't get RPM feedback from the fan with a 2 wire fan, but can you not control the duty cycle via that PWM?

Aling

Here we got some reply from the engineer.
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We can’t read the FAN RPM .
Current design is use a GPIO to simulate like PWM signal control the FAN VCC

Hugo

Is there a way to control pin 11 on CN34 through software or is it bound to the board's power state?

Aling

As far as our investigation, it is up to the power state. You can not control it from SW.