Power Profiler Kit 2

RE: Power Profiler Kit 2

Tiit — Thu, 17 Oct 2024 08:29:12 GMT

I resurrect an old thread, but I discovered the same situation. Struggled with strange random 10..14 mA current peaks with my custom nrf52840 board when measruring with PPK2 in source mode, and they went almost away when I put capacitor over power input (max 200uA periodic peaks after that).

Measurement without capacitor:

Measurement with capacitor:

Same firmware and same board, PPK2 settings are also the same.

On my PPK2 is something off also with voltage regulator. I have set output voltage 3180 mV, but actually the output is 3728 mV.

RE: Power Profiler Kit 2

Hidastelija — Wed, 04 May 2022 13:33:36 GMT

Hi Stian,

Here is one more picture where at first I had 100uF external capacitor connected and in the middle of the pic I pull the capacitor off. Device FW continues to stay in PSM and works normally. The power comes from a LiPo via PPK2 and the capacitor is connected parallel to nRF9160 Feather battery connector.

Br,

Ilkka

RE: Power Profiler Kit 2

Stian Røed Hafskjold — Wed, 04 May 2022 12:48:07 GMT

Hi, I will have to try and reproduce this here. It makes no sense that the current should be different with our without extra capacitors on VDD. I will get back to you.

Yes, there seems to be a typo in the documentation. Thanks for letting us know.

Best regards,
Stian

RE: Power Profiler Kit 2

Hidastelija — Tue, 03 May 2022 12:45:53 GMT

This picture is from Circuitdojo nRF9160 Feather. The measurement is done using PPK2 in ampere meter mode and power is supplied from a small LiPo battery. The battery voltage measures 4.09V.