Hi there,
We are seeing a massive difference in UART current between the same revision 2.0.0 nrf5340 devkits. Below, with the UART enabled with HWFC and only the receiver enabled, we measure a current of 509uA. Please note that the uart is not connected to anything externally at the moment.
However, when measuring the current on a different device with the exact same configuration as specified above, we measure 771 uA:
This is a massive increase. We are measuring the current by cutting SB40, shorting the VIO_REF and VDD_nRF pins, setting the PPK2 as source at 3.3V, and connecting it to VDD_nRF and ground.
Can you please refer me to an example uart application, which I can simply upload onto the board to double check that the example firmware actually gives the same result? I have tried building the bluetooth peripheral uart sample but that draws way more current (like 2mA or something).
We have been able to see the higher and lower currents on multiple boards.
The only thing I think might have caused a higher current draw, is that we took the new nrf5340 and new nrf1960 out of the box and soldered the following pins together:
Only then, we program the nrf9160 and the nrf5340. It might be that the default firmware that are on the devkits out of the box caused a short and damage to the chip somehow? This seems unlikely though.
Thus as a summary:
1) Please refer me to an example uart application to confirm current draw of uart
2) Is it possible that default firmware on the devices could have caused shorts in the above configuration?
