We are using nRF52840 chip for a power-sensitive application.
We use the UART which is connected to a LoRaWAN module.
Now when I enter the system ON mode after completing sending data via LoRaWAN module, I see that the system on current is about 600mA.
At this point I only have the UART and the RTC peripheral running. There is a fallback timer that has been initialized but is not running.
Does this number look correct? I feel that 600mA in system ON mode is too high even when the UART is active.
I tried disabling the UART and then the current consumption drops to 20uA. But one peripheral consuming so much current doesn't seem correct.
Please advise how we can reduce this current.