Dear sir or madam,
I am facing a peculiar issue. In my application, I am using nrf52840 dongle and I am setting several GPIO pins as output pins with output value high that means approximately 3V .. 2.96V
The majority of set pins have the output voltage value of 2.96V, but only one pin (GPIO 0.13 the first pin on the right side from USB view) has the value of 2.46V, I would be fine with that, but it is recognized as output low and logical low in my application instead of logical high. It seems like pin 0.13 is still functional as I can toggle it to 0V and back to high state, but it still yields 2.46V
If I burn the firmware to another nrf52840 dongle, the same pin (0.13) has voltage 2.96V as expected. So I suspect the problem is on a hardware side.
But could anyone explain me this issue? Could there be some kind of voltage leakage or downlead which causes this issue?Is there any way how to fix it?
We planned to heat the board so that any cold solder join could dissappear, but we would rather wait for advice. Apart from soldering a header to pins we did not do any change to the hardware. It is standard Nordic manufactured NRF52840 dongle.
Thank you
Ivo