I have a Rev C xM board. I wish to monitor the “on DC” signal that the
schematic shows coming into GPIO 6 on the TPS65950.
I know my software is correct as I can read GPIO 0 which is the SD
card detect signal and I can see it toggling as I insert and remove
the card. When I move it to GPIO 6 it shows high all the time even
though I am powering from DC.
I probed with a scope Q2A collector and it shows the pin high (1.8v)
which should not be the case with DC applied (DC_IN is 5v). It looks
like the transistor is not turning on.
I also probed while just statically sitting in the boot loader, so the
GPIO pin mux should be configured as default (i.e. input). I checked
the registers and they are inputs so the pin is not being driven from
the TPS65950 side.
Has this circuit been tested? Could it be R144 is too high?