My current consumption vs online power profiler estimation

[kb2423]

Hello, I am using nRF52832 dev kit. I am trying to get lower current consumption. I used ble_app_blinky example and disabled the NRF_LOG. My settings are below:

Role: Advertising (connectable)

Advertising interval: 250 ms

TX payload: 10 byte

Radio TX Power: 0dBm

DCDC regulator: ON

When I try this settings on online power profiler it estimates 44 uA and when I measure with PPK2 I see 73-75 uA current consumption. I disabled NRF_LOG, leds and buttons but I am missing something. What should I do to get estimated value?

[kb2423]

Thank you so much for your effort. Actually I tried to use external supply to get better solution so I tried to short SB12 which was so small. When I tried to do it I accidentally remove D1 diode and I couldn't put it back, now I cant program that dev kit. I have only one remaining kit so I didn't want to take risk that's why I am using USB as power supply. "Unless powered by USB, short solder bridge SB11 (if using coin cell battery) or SB12 (if using external power supply) to bypass the protection diode which would otherwise give a voltage drop."  This was from infocenter, I think there is no need to modify dev kit except cutting SB9. 

(This picture is from old versions, newer versions have diodes near SB12-SB11)

My connections are like that.

Power profiler software settings are same with this picture.

[Einar Thorsrud]

I see. That looks OK to me. I will replicate your setup and test on my end on Monday.

[kb2423]

I was using SDK 15.0.0 and downloaded same SDK again to be sure I didnt change anything. I did exact same changes with you.

Mesurement result was 75 uA.

Then I wanted to try latest SDK so I downloaded SDK 17.1.0 and made same changes. New measurement result was 68 uA.

I tried using SDK 15.0.0 and SDK 17.1.0 3 times and I got same results. So I will be waiting to hear from you. By the way my dev kit version is 2.1.0 . Thank you.

[Einar Thorsrud]

Hello,

I reproduced this myself using PPK2. It turns out that if you power the DUT using USB that causes noise that results in measurement errors. I recommend you remove the USB cable from the DK and power using a lab power supply instead. That will give you more accurate (and lower in this case) measurement results.