NRF52840 DK - Programming external custom board at 3.3V

[bpolito8]

Hi,

I’m looking to program an external device that runs on 3.3V with my NRF52840 DK (v3.0.1), and I’m looking to verify that this is possible. I know that the DK runs at 3.0V.

If I would like to achieve this through the P19/Debug OUT Connector, should I bridge SB19 and leave SB47 open? I am planning to power the device separately from the DK. Please let me know if I am on the right track with this approach, thank you!

[SwRa]

Hello,

The voltage on the external board needs to match the DK while programming. ( It is okay to power the board differently under normal operation.) So I suggest that you keep the volage same as that of the DK only while programing/debugging.. If that is not suitable, then you can use alternative options to program your custom board, like a dedicated JLink programmer which supports 1.8V or the nRF54L15-DK. The nRF54L15 DK supports programming and debugging external nRF51, nRF52, nRF53, and nRF54 Series SoCs within a 1.8V–3.6V range. Hope that helps.

Best Regards,

Swathy

[ign0]

hi SwRa, thanks, all was working perfect under 1v8 volts!

thanks!