RE: Programming with nRF52833DK with SWD at 1.8V

rgangwan — Wed, 01 Feb 2023 21:52:07 GMT

Hi Simon,

Thanks for the response!

I do have access to a pad, so I can temporarily bypass VDDH logic and have VDD at 3V. I was able to program this way. I'm thinking of then modifying the REGOUT0 value (with nrfjprog) to set it at 3V so I no longer have to touch the pad and can still use the development board to program the PCB.

Long term I'll redesign to make everything 3V again. Appreciate the support!

RE: Programming with nRF52833DK with SWD at 1.8V

Simonr — Mon, 23 Jan 2023 11:40:52 GMT

Our Development kits are only designed for programming external targets at 3.0V VDD, and we would recommend one of the J-Link devices that officially support programming at the voltage you need. However, a note in the DK user guide (page 32) says "The voltage supported by external debugging/programming is VDD voltage. Normally, this is 3 V when running from USB, but if the onboard nRF52833 SoC is supplied from either USB or Li-Ion, the nRF power source switch (SW9) is in either Li-Po or USB position," VDD can be set to other voltages. "For both P19 and P20, the interface MCU will detect the supply voltage on the mounted shield and program/debug the target." However, it is not designed for or tested for programming at other voltages, but it might work.

Best regards,

Simon