nRF51822 not reset

RE: nRF51822 not reset

Kenneth — Mon, 24 Sep 2018 08:08:20 GMT

If this is big problem you may consider adding an off-chip reset circuitry, for instance a 1Mohm between nRESET(SWDIO) and GND may act as a low cost off-chip reset circuit. Though this will add an increase in idle current consumption in active mode with ~VDD/1Mohm = ~2uA.

Best regards,
Kenneth

RE: nRF51822 not reset

Jon (jono) — Mon, 24 Sep 2018 06:40:30 GMT

Nordic: Any news on this one? We're still experiencing this problem once in a while, especially a backup capacitor keeping the RTC active may keep this issue active for a very long while.

RE: nRF51822 not reset

Jon (jono) — Wed, 09 Nov 2016 14:52:48 GMT

Edited: 0.4v was on an IO-pin, not VCC.

We have reproduced this error, one io pin remains at approx 0.4v over night. On the morning when powering back up to 3v3 @ 4ms the chip does not boot.

Software ligths led and delays first thing -> not a sw issue.

Repeated powercycles chip does not reset! During these cycles there are some residual potential on VCC in the range 0.4..0.1V

Has happened at least 4 times and on different units. Chip rev: N51822QFACA11544GA.

RE: nRF51822 not reset

Swain1 — Fri, 22 Jul 2016 06:24:17 GMT

Hi Wan, did you find a fix for this issue? we are having similar issue where it does not reset properly each time when the VCC does not go right off. If you have any information that would be great!

RE: nRF51822 not reset

bin simon — Fri, 24 Jun 2016 09:48:28 GMT

hello,wan. Have you resolved the above problem? If so, could you tell me how you did it? I've been facing the same problem. I hope you will be able to provide the information.

RE: nRF51822 not reset

Kenneth — Mon, 18 Apr 2016 12:29:06 GMT

Hi, we need more information that would allow us to find exact cause, please create a case on My Page and add the following details:

Schematic and layout.
A description of test setup.
Frequency of occurrence and build code.
Analog capture of VDD, nRESET, DEC1 and DEC2.