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USB Fan stays on after shutdown
#1
Coming from a Raspberry Pi background (somewhat..) i've been really impressed with the power of the Tinker Board so far. Been playing around with it this past week and i'm enjoying it so far. However, i noticed one that when using a USB fan - i have a 40mm fan which is perfect for cooling - it stays on running after the Tinker Board shuts down. I would have to disconnect the micro-usb to stop power from going into the USB ports. This doesn't happen with the Raspberry Pi, it just turns off when it safely shut downs which is great. Any ideas on this? Or do i need to use the GPIO fan instead?
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#2
Power goes to GPIO pins after shutdown as well
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#3
(11-03-2017, 06:01 AM)ra51 Wrote: Coming from a Raspberry Pi background (somewhat..) i've been really impressed with the power of the Tinker Board so far. Been playing around with it this past week and i'm enjoying it so far. However, i noticed one that when using a USB fan - i have a 40mm fan which is perfect for cooling - it stays on running after the Tinker Board shuts down. I would have to disconnect the micro-usb to stop power from going into the USB ports. This doesn't happen with the Raspberry Pi, it just turns off when it safely shut downs which is great. Any ideas on this? Or do i need to use the GPIO fan instead?

Yes, the 5v pins 4 and 6 do not shutdown.  So the usb fan voltages must have the same issue.
Only the 3.4v pins shutdown, pin 1 and 14 or 20.
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#4
Yes, the USB supply is tied directly to the Vin supply, and is not regulated by the rk808, as shown on the board schematic
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#5
Oh, interesting. So a 5V fan on one of the 3V pins should power off. Good to know!
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#6
Pin 1 and pin 14 I think or 17. I think 17 won't turn off. There are 3 black pins.

(11-17-2017, 12:55 AM)BeauSlim Wrote: Oh, interesting.  So a 5V fan on one of the 3V pins should power off.  Good to know!

Pin 1 and pin 14.  There are 3 black pins.
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