• State Verified Answer
  • Replies 6 replies
  • Subscribers 73 subscribers
  • Views 1281 views
  • Users 0 members are here
Attachments (0)
Nordic Case Info
  • Case ID: 251390
Options
This post is older than 2 years and might not be relevant anymore
More Info: Consider searching for newer posts

PPK showing 80 mA on DK

Konrad213

Hi! 

I've been having some issues with the ppk recently. I've been trying to measure the current on our custom board but it was showing way too much so I tried on the DK. This is what I'm getting:

The higher baseline is just as soon as the ppk measurement starts and then goes away and consistently stays as it is on the right side of the image. I've tried switching out the DK and the PPK and nothing helped. Wondering if you know what the issue could be? I'm not 100% sure if it started after, but I recently upgraded the nrf connect firmware (don't remember exactly from which version but probably 3.3.X). 

  • 0

    Hi Konrad

    Were you supposed to upload an image to this ticket? If so, please try again as I don't think it was uploaded. Either way, here are a few suggestions: Make sure that the switches on the PPK are in the correct positions. When measuring on a DK, the correct setup should be the following

    • Power select: DK
    • DUT select: DK
    • COM: DK

    Please also verify that you have cut the solder bridge on your DK. SB9 for nRF52832 DKs. SB40 for nRF52840, nRF52833, and nRF5340 DKs. If you think the nRFConnect update might be the issue, you can try downgrading to an older version of the Power Profiler app like this:

    • Download and install nRFConnect.
    • Uninstall the current nRFConnect programmer version by clicking the dropdown tab and uninstall.
    • Close nRFConnect
    • Download and place the .tgz file in C:\Users\<username>\.nrfconnect-apps\local\.
    • Open nRFConnect and run the app. You should now be using the version you placed in the \local\ folder.

    Best regards,

    Simon

  • 0 in reply to Simonr

    Thanks Simon,

    Yes switches are in the right position and the solder bridge is cut. I just downloaded an older version of nrf connect and it's still not working. Sorry about the picture, here it is again:

  • +1

    Hi Konrad

    Thank you for the image upload and the confirmation of your setup. Do you have multiple PPKs behaving like this, or just the one? From the image, it does not look good, as a current draw of 80+ mA generally points towards something being defect on the PPK. Was it like this when you got it, or did it happen after some time of operation? Are you able to see any physical components missing on the PPK, or have you powered it with more than 3.6V at any point that might have damaged it? Can you please try to explain in detail what happened when/prior to the PPK when it started showing these values?

    Best regards,

    Simon

  • 0 in reply to Simonr

    Thanks Simon, yeah it's probably due to powering it with a 3.7V battery. It worked fine for a long time before this behavior started though but it might just be that the battery was partially discharged with a lower voltage than 3.7 and it stopped working after charging (not sure about this). Do you think there could be any other reason? I've seen this behavior on two different ppks.

  • 0

    Hi

    I'm sorry, but the pulses you are describing as well as the fact that you've been powering it/them with more than the specified maximum input voltage points towards that the PPK(s) have been damaged by the input voltage. There could, of course, be another reason, but the 80mA peaks from your previous image mean that the devices are no longer working I'm afraid.

    Sorry to break it to you,

    Simon

Related
Terms of service