NRF52832 pins toggling during FW Flash

[Christopher]

I am working on a product which uses the nRF52832-CIAA. Whenever I update the firmware via JLINK/SWD, there is a pin (P0.19) which toggles during the FWUP process.

This signal only drives an NFET and has a pulldown on it, so it is not floating. I see it being actively driven from the MCU, and it is causing device failures during FW UP.

Here is an image of P0.19 during FW flashing via SWD.

Any advice? Is this expected?

Thanks!

[Simonr]

Hi

This seems very strange. What kind of firmware is on this device, and how does it fail during firmware updates? Can you provide an error code? Have you encountered this issue on multiple boards? If you are getting this error on one specific board, it might be a shorting somewhere on the board itself.

Best regards,

Simon

[Christopher]

We are seeing the pin toggle on all boards while we are flashing FW via JTAG/SWD. The flashing succeeds, no problem there, but the toggling of the pin causing a function failure on the board (this pin should not be toggling during fw flashing)

We have encountered this on all of our boards.