NRF52840DK + PPK2

[JulianKaroliny]

Dear Dev-Zone Team,

I just got my PPK2 and wanted to test it on the nrf52840

It seams to work fine, I can see the advertisement peaks, however the average power consumption was too high. I tried different configurations but ther was always a noisy average power consumption of 0.6mA to 1.4mA (depending on the configuration I tried)

After some bugfixing i found this post and tried the configuration there https://devzone.nordicsemi.com/f/nordic-q-a/82804/nrf52840-ppk2---source-meter-vs-ampere-meter/344105#344105

That is:
Source meter mode:

1. Power the nRF52 directly from P21 by using the SW10 (VEXT -> nRF)
2. If SB40 is previously cut, put a jumper on P22.
3. The USB should be left connected in order to power the rest of the DK (otherwise you will get leakage through the SWD interface)
4. The nRF ONLY switch (SW6) should be set to nRF ONLY to avoid leakage currents

As software example I used the Peripheral_hr example of the nrf connect sdk 1.7.1

in the prj.conf I set  CONFIG_BT_DEBUG_LOG=n, though I think that did not change anything

Here is a picture of the PPK2 result 

I also tried the amperemeter solution but i got a similar result

I hope I provided all needed informations

br

Julian

[Simonr]

Hi

I tested this on my end and was surprised that I saw the same current consumption as you reported. That is, until I realized that I had missed a rather vital configuration. By setting CONFIG_SERIAL=n you should see this noise floor go down. The Dongle does not have this enabled by default which is why you saw the lower current consumption on it. Sorry it took so long for me to realize.

Best regards,

Simon