SOLVED nRF52810 module high current, wakeup every 26ms

RE: SOLVED nRF52810 module high current, wakeup every 26ms

nemik — Sat, 13 Jan 2018 18:45:02 GMT

Just want to also add that a decoupling capacitor close to the Vdd pin is no joke, it's extremely important as everyone says and my fault for not placing one. I put in a 0603 22uF cap there and the signal is so nice and smooth now, only the Tx power spikes can be seen and the noise floor is very low as it should be.

RE: SOLVED nRF52810 module high current, wakeup every 26ms

nemik — Sat, 13 Jan 2018 15:44:58 GMT

The second screenshot is actually between advertisements. The advertisements themselves are very clear larger peaks that go up to 13 mA which makes sense for a 0 db transmission and are only present in the first screenshot.

Those smaller spikes every 26ms don't look like transmissions, their peaks are only 600 uA and they slope downwards instead of a sharp drop like a transmission, and don't even last for long enough. I updated the post with a new screenshot zooming in on one of the spikes.

If you see similar problems, try to shorten cable runs, tighten up connectors, and use a battery instead of a bench power supply. All of those helped me out, but I also have a stupid error in my PCB that I think can produce stray capacitance and make this problem worse.

RE: SOLVED nRF52810 module high current, wakeup every 26ms

J.Kwon — Sat, 13 Jan 2018 07:00:53 GMT

I encountered this issue but did not receive any answer from nordic..

This problem may be related with using radio.

I think second screenshot is captured when your device is advertising.

The more radio you use, the more spikes occur.

Maybe if you do not use radio, these spikes will not occur.

Since the size of the spike is insignificant, it will not have a significant effect on the circuit unless the amplifier is used.

But I also care about this problem... I was planning to use the bead on the power supply to test it, but I did not have time.