NRF52840 WLCSP CKAA Problems on program from Segger.

RE: NRF52840 WLCSP CKAA Problems on program from Segger.

decastro_25 — Fri, 15 Nov 2019 11:31:42 GMT

I found the error!! I've tried to download a hello world example from Nordic, and it works!

I was checking my code and its on the clock frequency section, during the test I reconfigured some parameter and for that reason it doesn't work.

I attach a video!!

devzone.nordicsemi.com/.../video_5F00_2019_2D00_11_2D00_15_5F00_12_2D00_30_2D00_52.mp4

RE: NRF52840 WLCSP CKAA Problems on program from Segger.

Nguyen Hoan Hoang — Fri, 15 Nov 2019 11:12:28 GMT

If I am not mistaken, you said the code works on other board but not this one. What see on the video is that multiple led turns on and off at the same time which suggest a short. With CSP package, the probability of that is high.

CSP or QFN make no difference for software. So based on what you reported, it is unlikely be software issue but hardware problem it is

RE: NRF52840 WLCSP CKAA Problems on program from Segger.

decastro_25 — Fri, 15 Nov 2019 11:07:30 GMT

I'm not agree, because I was checking the pins one by one if they're shorted with the closest one, and it's open.

I think that the problem is on the compiler, I should change something on Segger Studio for that processor but I don't know what.

RE: NRF52840 WLCSP CKAA Problems on program from Segger.

Nguyen Hoan Hoang — Fri, 15 Nov 2019 10:37:30 GMT

you're lucky to be able to program it. Looks like you have quite a few pins shorted together