power consumption of around 0.77mA even after system off command

[Juliusc]

I noticed that my custom pcb draws power even when just commanding a simple system off call..

Im certain that this is not hardware related as I did the same with one of the nrf examples from SDK 15.3 and the power consumption goes down to below 100uA which I would expect. 

Which preprocessor definitions or project configurations could lead to such behavior?

My main loop is just 

NRF_POWER->SYSTEMOFF = 1; 

nothing else so it must be in the configuration but I cant point out where. How would I find a source for this problem?

Im using an nrf52840 uC on a custom board but as I said hardware shouldn't be a problem as I tested this. 

[Susheel Nuguru]

I am assuming that you see the issue with latest nRF5SDK v17.1.0 as compared to your working test in v15.3. Can you give me the exact version of the nRF52840 chip you are using? (Full Laser marking on the chip). Are you sure that you have chose the correct variant of the chip when testing in the latest SDK? 

So you have not configured any GPIO or other peripheral but just entering system_off as soon as you enter main? Then it seems strange to me with the difference from 100uA to 0.77mA. When you give me the laser markings of the chip, I can try to test this myself on desk to see if I see the same difference.

[Juliusc]

QIAAD0

2245NG

Actually I am using 15.3 all the time so this shouldnt be a problem

[Susheel Nuguru]

I did not manage to test this today Jullius. I will try to test this tomorrow. Sorry for delays

[Susheel Nuguru]

Tested this on our DK and it seems to give proper sleep currents of average 4uA

[Juliusc]

I understand but this doesnt chnage the fact that I also got low sleeping current when using an SDK example but 1mA when using my project - the same line of code but this significant difference which in my eyes means that there MUST be something else which I cannot make out.