PPK 2 average current measurement ~75 mA on ble_app_pwr_profiling

[DimitraN]

I am trying to measure the current consumption on nRF52832 PCA 10040 2.0.0 with PPK 2 (PCA 63100 1.0.1).

I have cut the SB9 and connect the PPK as the picture:

as shown in the PPK 2 User Guide. 

I use Ampere Mode and enable Power Output, in Power Profiler App in nRF Connect.

But the average current consumption is very high ~75 mA

Also, I tried to measure the ble_app_pwr_profiling (wrote the hex to the DK from nRF Connect Programmer) and still the consumption is ~75 mA.

What am I doing wrong? 

I know there is nothing wrong on the DK, since if I use it with debugger and it works fine. 


After reading this  Current measurement guide: Measuring current with PCA10040 v0.9.0  carefully I understand that I am not supposed to have USB cable connected to the DK.
I removed it, and connected the coin cell battery to the DK. The current is ~18 mA but it looks like the DK doesn't turn on at all. 

I am thinking about powering the DK with another battery and connect it to the P21. 

Is it true that I shouldn't connect the USB and this was responsible for the high current? 
Why DK doesn't power on with the coin cell battery?

Any help will be much appreciated.

[SwRa]

HI Dimitra,

Connecting the device as shown in the user guide should work just fine. 

as shown in the PPK 2 User Guide.

75mA in indeed way too high.. Could you maybe show a picture of your setup.?

Regards,

Swathy

[DimitraN]

Yes sure! 

First, SB9 is cut and SB12 is soldered. 
I connect a jumper in P22 to connect USB, and program the DK. Using the hex file of the ble_app_pwr_profiling and nRF Connect Programmer, I write the code in the device. (The coin cell battery is not inserted). 

I disconnect the jumper, and connect the PPK2. 

Vout and Vin of PPK to P22 and GND to External Supply - . 

I turn both devices on, and here is a screenshot from nRF Connect Power Profiler App:

and after I press button 1 for advertising:

If I don't use the USB and connect the coin cell battery, the setup is:

and the result in power profiler:

 the LED on the DK doesn't turn on, so the device is not powered on. 

Please help me if you have any suggestion, because I have no ideas left for what I might be doing wrong, or what has gone wrong in total.. 

Regards, 

Dimitra

[DimitraN]

I did the same connections with another DK and the consumption is closer to the expected. Turns out that probably there is something wrong with the specific DK.

[Usha]

Title: PPK2 Suddenly Not Detected as USB Port

Hello,
My PPK2 was working fine, but now it’s not showing up as a USB port on my system. I’ve tried multiple USB cables, different ports, and another computer, but it still doesn’t work. generally Red LED On the device power Up but now, no led indication happening and also the device port not coming.