abnormal current peak when system off (0.6mA)

[LeoSanta]

Hello everybody.

I am developing a BLE application in which I am using WDT every 12 seconds and a RTC interrupt every 10 seconds to send some information.

When you press a button for a short period of time the device goes into SYSTEM OFF MODE and it only wakes up when you press the button again.

The problem is that besides I am having the average current of 0.4uA for SYSTEM OFF MODE, using the PPK2 I can see some stranges peaks of current from time to time (it seems they are not periodic).

Can anyone explain me, please, if this is a normal peak or I am missing some configuration?

[Kenneth]

Hi,

The very small spikes you can see between the high spikes are the normal refresh spikes for internal regulators. If the high spikes were caused by the nRF52 then these small spikes would be skipped/delayed, that is not the case, so this means that the high spikes is not someting caused by the nRF52 directly. It is more likely someonthing drawing current on the VDD domain, e.g. something externally or possible GPIO's.

So I don't know the exact cause of your large spikes no, you will need to debug further to narrow it down.

Best regards,
Kenneth

[LeoSanta]

Dear Kenneth, thank you for the answer.

I will check carefully all the components to check from where those speaks come.

Greetings,

Leonardo