Why the current consumptions of the idle state in connected mode are changed over time?

[xvhongpeng]

Dear friends,

       Software &Hardware: Power Profiling Application (a SDK example), S132 softdevice, nRF52832(PCA10040), Power Monitor. The measured average current consumptions (I) of the idle state in connected mode are changed over time. For example, the value of I was 0.20mA at 8:00, but it might be 1.11mA at 12:00. (1) Why does it change over time? (with the same code, the same hardware, and the same Power Monitor) (2) Why does it become so large?  Thank u.

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[Susheel Nuguru]

really hard to say without knowing which application your are measuring the power consumption for. Are you using and serial transfers? if so can you please check if you have been hit with any of the hardware ERRATA where there might be power consumption increase and check if the workaround is available for it and is applied in your code.

[xvhongpeng]

i am using the Power Profiling Application (an nordic example in the SDK12)

[Susheel Nuguru]

i have ran this over two hours now on my PCA10040 board with the same example and the idle currents are much lower than your minimum. Please see the attached image.

[xvhongpeng]

Surprise! thank u very much. i never get such low avg current. How can u make it? can u share me with your configurations? and what is your current measure tool? nRF connect? can i get it? or where can i buy it? regards. 

[Susheel Nuguru]

its nRFConnect and is free. You can download it from our website here. please watch the tutorial here

[xvhongpeng]

thank u. I got a PPK（PCA63511), and i configured it as the tutorrial. However, as u can see in the pic below, i cannot connect it.

[Susheel Nuguru]

did you make sure that the dip switches on your PPK is same as  mentioned in the tutorial ? 

Seems like they are not set to correct settings.