nRF52840 reset failure

RE: nRF52840 reset failure

d_b — Thu, 18 Jul 2024 23:07:03 GMT

Hi, did you come to a final conclusion on this issue? We are seeing the same symptoms. If you have specific steps you found recreate the issue, that would be incredibly helpful. Thanks!

RE: nRF52840 reset failure

Yang22 — Wed, 22 May 2024 09:42:57 GMT

Hi Simon,

Thank you very much for your feedback and the solution you provided.

The issue occurs when our battery’s voltage becomes unstable, fluctuating between 3 V and 0 V in a short time frame, and the reset pin is pulled up by a 3.3V regulator from the battery. We are wondering if the unstable VCC affects the reset pins during these rapid level changes.

Reproducing the issue is challenging and can only be reproduced one or two times during a 1-hour test. In our tests, we use a power supply to simulate the battery and incrementally switch the power between 0 V and 3 V. The nRF then powers off and will reboot once the voltage recovers to more than 1.8 V.

Thank you for reviewing the hardware of our board. I will create a private DevZone case and upload the relevant files.

Thanks a lot and Best regards,

Yang

RE: nRF52840 reset failure

Simonr — Tue, 21 May 2024 13:12:37 GMT

Are you able to reproduce this issue with an nRF52840 DK or do you only see it in your custom board? One thing you can try is to disable the pin reset and using a regular GPIO to do a soft reset as that can potentially fix this issue.

Can you also share some info on what exactly the application is doing when this occurs? We could also do a HW review of your board to make sure everything looks good in a HW sense if this is only reproducible on the custom board on your end. In that case you can create a private DevZone case where you upload the schematics and gerber files of PCB layout.

Best regards,

Simon