Noise PPK and nRF52840

[ToasTer86]

Hi Nordic,

I have been quiet for a long time but here is another question.

For the project I am working on I want to measure the current with the PPK. Although it seems I am only getting noise.

Setup I did: SW2 = set to DK SW3 = set to DK SW4 = set to DK Cut SB40 on the nRF52840 (as far as my knowledge goes). How do I really do this ? I am running the USB power source on the nRF52840. The application runs.

Below are 2 images of the power, but this just does not seem right. The power usage seems way to low.

Thanks for any help with this,

ToasTer

[Bjørn Kvaale]

You will need to cut both SB40 & SB41 on the nrf52840 PDK to be able to use the PPK (see this link here for more info).

Update: I just tested this on the 0.9.3 & 0.10.0 nrf52840 PDKs using the Blinky example located in: C:\NordicSemi\SDKs\nRF5_SDK_14.2.0_17b948a\nRF5_SDK_14.2.0_17b948a\examples\peripheral\blinky\hex. What I did was first power the PDK board via J2 & set the power source switch to VDD. SW6 on the PDK was set to Default. Both solder bridges SB40 & SB41 were cut & no wires were attached to either the VDD_HV or VDD pins. Then, I attached the PPK & like you said set SW2 & SW4 to DK because the device under test is the DK & the PPK is getting power from the 52840PDK. To then program the Blinky app hex file using nrfgostudio, I set the COM switch on the PPK to EXT (this programs the device under test (DUT) instead of the PPK). I then programmed the hex file (pca10056) & noticed that the four LEDs on the PDK start blinking one after another. Then, set the COM switch back to DK & run the ppk.py file. If you forget to switch the COM switch back, you will get an error when trying to run ppk.py. I get a current consumption of about 4.8 mA with both boards, which seems about correct (see link).

[ToasTer86]

Hey Bjørn Kvaale thanks for your response. I also cut SB41 and measured them with a voltmeter, they are not connected anymore.

Although I am still getting the same results as in the screenshots above.