Debug a 1V8 custom PCB with nRF5340 DK

[Joao Colombari]

Hi guys, 

I have made a custom PCB based on the nRF5340 and for debugging it I have only added a SWD interface. 

The problem is that this PCB works with 1V8, and in the tech support of the nRF534o DK you say that the voltage on the external board must match that of the DK, which is 3V0 when using the USB. 

How can we match the target voltage in this case? Is it possible?? 

Best!

João.

[JONATHAN LL]

If nothing on the target board(custom PCB) will take damage from operating at 3V then I would just power the board directly from the nRF5340DK. 
That is the simplest solution that guarantee successful programming.  

You can try to program the custom board without matching the voltage and it might still work. The main issue here is that the logic high/low state might not be triggered properly if there is a voltage difference.  


Regards,
Jonathan