Programming custom NRF52832 board using NRF52-DK, updated supply PIN-Assignment

RE: Programming custom NRF52832 board using NRF52-DK, updated supply PIN-Assignment

Kenneth — Wed, 24 Jun 2026 12:45:31 GMT

Not sure I fully understand the question, but I guess you can say VDD and VDD_nRF on header P20 are outputs yes, since they can power circuitry externally. The SWDIO is bidirectional. The SWDCLK, SWO (optional), RESET (optional) are outputs. SELECT is an input pin (must be connected to VDD of the external board). GND is mandatory (but not on the P20 header, so must be connected somewhere else).

Kenneth

RE: Programming custom NRF52832 board using NRF52-DK, updated supply PIN-Assignment

nRF52_DK_usr — Wed, 24 Jun 2026 12:34:14 GMT

Hello,

thanks for the quick reply. So, following your explanation, the VDD is an Output, while all SWD1 are input Connectors?

Do i get that correct?

The "Main nRF52DK power domain" is/was confusing me to be an input.

RE: Programming custom NRF52832 board using NRF52-DK, updated supply PIN-Assignment

Kenneth — Wed, 24 Jun 2026 11:20:39 GMT

Hello,

This answer should still be valid: RE: nRF52 DK V3.0.0 Debug out for programming external board can't work

You should measure the VDD voltage on the DK and compare with the VDD custom board and ensure the difference is less than 0.3V (or you can just take VDD from the DK to power your board to ensure they are equal). Also connect GND somewhere between the two boards.

Kenneth