Hi folks
We are facing an issue with occasionally ~240 uA added current consumption on our nRF52832 based custom board when it comes out of reset. We only see the problem on maybe 1-2% of the devices and even devices having this erratic behavior does not aways exhibit this issue. To narrow down the root cause of the problem we have tried various things, but so far only below "solutions" seems to solve the problem:
1. Replace the softreset with a watchdog reset seems to solve the problem.
2. Removing the secure bootloader from the solution and just let the device startup in our application from reset seems to solve the problem. We can softreset the device without having the extra current consumption after reset.
We have verified that just before softresetting the device the current consumption is normal (not the added ~230 uA), but just after reset the current is added an so far only if the secure bootloader is part of the solution.
Judging from the amount of added current consumption, I suspect it is a resource in the chip that has requested for the HF oscillator and forget to turn it off again. Is there any known issues regarding this with the secure bootloader? Any other clue that could cause this issue?
We are using Softdevice S132 v5.0.0 / SDK 14.0.0 and its accompanying secure_bootloader_ble