Set VDD in firmware on nRF5340 DK

Question

Hi, 
 
 The manual for nRF5340 DK states: "VDD can be set by the nRF5340 firmware". I need to set the VDD to 1.8V. How is this done? I can't find any code documentation on this. 
 
 Regards, 
 Marius

user116816 · Accepted Answer

I solved it.

- Set VREGHVOUT to 0 (nrfjprog -f nrf53 --memwr 0x00FF8010 --val 0 )
- Power the nRF from J3
- Set SW9 to USB
- Power rest of DK from J2, which will mirror the VDD_nRF.

Then VDD is 1.8V and external boards with 1.8V can be programmed using J19 or J20.

Set VDD in firmware on nRF5340 DK

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