Raytac MDBT53(nRF5340) custom board SWD not responding after erase

RE: Raytac MDBT53(nRF5340) custom board SWD not responding after erase

ffenix — Tue, 02 Jul 2024 06:34:19 GMT

Hello Runar,

Thank you for the proposed solution. While I cannot test it directly, I was able to produce another board and build a configuration with DCDC off based on this comment. On this new board and with disabled DCDC the board does not become bricked, and I think this particular issue is resolved.

I cannot recover the bricked boards at this time, but your solution should work.

Thank you.

RE: Raytac MDBT53(nRF5340) custom board SWD not responding after erase

runsiv — Mon, 24 Jun 2024 12:38:53 GMT

I will take a look at your case.

[quote user=""]

Could this be because of missing LF crystal? And if so - would this solution fix the issue?

[/quote]

The use of internal LF cystall should solve the issue with the application not starting. However you should still be able to flash the device without any issue.

I suspect it might be that the module is missing the coil for DCDC, and if that is the case you can have a look at this case on how to recover the device.

Regards

Runar

RE: Raytac MDBT53(nRF5340) custom board SWD not responding after erase

ffenix — Sun, 23 Jun 2024 15:05:21 GMT

A bit of clarification: after the "erase & write" the chip will output 1.8V, but SWD is not accessible not like that, not while connecting DKs VDD to custom board's VDD, making it output 3V.