Overheating nrf52840

RE: Overheating nrf52840

Sergy — Thu, 23 Sep 2021 08:01:02 GMT

This was a production issue where 5v was shorted on one of the pins of ntf52.

RE: Overheating nrf52840

Sergy — Tue, 14 Sep 2021 11:12:35 GMT

Just created a new ticket. Ill be happy to show results here later on.

RE: Overheating nrf52840

JONATHAN LL — Tue, 14 Sep 2021 11:03:52 GMT

I can make this ticket private, or you can create a new ticket that is private.

RE: Overheating nrf52840

Sergy — Tue, 14 Sep 2021 11:02:21 GMT

Hi Jonathan,

Unfortunately I didnt.

How can I send schematics to you privately?

Thanks!

RE: Overheating nrf52840

JONATHAN LL — Tue, 14 Sep 2021 11:00:44 GMT

Hi Sergey,

Did you find a solution or what caused the issue ?

If you want i can have a look at the schematics, and see if i find anything of concern.

Regards,
Jonathan

RE: Overheating nrf52840

Nguyen Hoan Hoang — Mon, 13 Sep 2021 11:56:01 GMT

That is correct.

RE: Overheating nrf52840

Sergy — Mon, 13 Sep 2021 11:53:35 GMT

if i use chiperase, id assume it wouldnt set pins as output?

RE: Overheating nrf52840

Nguyen Hoan Hoang — Mon, 13 Sep 2021 11:42:42 GMT

Looks like you have a gpio configured as output but got shorted to gnd. You can try to find it using a firmware that doesn't enable any gpio at all to see if it has the same problem. Then one by one enable each gpio until you find it.

RE: Overheating nrf52840

Sergy — Mon, 13 Sep 2021 11:39:41 GMT

Indeed tried a few boards and can't find the short. Can you confirm that disconnected VDDH won't have this kind of effect?

Thing is I can connect to the chip and program it, but at some point it heats up and gets damaged.

RE: Overheating nrf52840

Nguyen Hoan Hoang — Mon, 13 Sep 2021 11:36:00 GMT

You must have a short somewhere or a bad chip. Try another board to see if you get the same result.