7 Replies Latest reply on May 11, 2016 12:05 PM by ryanstout

    Disable USB power via PSW

    ryanstout

      Looking at the schematic for the sparkfun base block (and I believe the mini-breakout board), the PSW pin on the edison connects to a MIC2039 to control power to the OTG USB connection.  I'm working on a product that needs to disable the USB power.  (the device it connects to is not smart enough to suspend correctly)

       

      Control of PSW Signal (USB Power Enable)?

      The above link mentions using echo '1-1' > unbind in /sys/bus/usb/drivers/usb but this does not appear to have any effect.  My voltage meter in the usb path still shows 5v.  Is there a way I can control the PSW pin to disable USB when needed?

       

      Thanks,

      Ryan