RE: NRF52840 DK Debug Out SWD @ 3.3V

Mar840 — Mon, 13 May 2024 09:54:42 GMT

Hi, it's much clearer for me now, thank you!

RE: NRF52840 DK Debug Out SWD @ 3.3V

Priyanka — Mon, 13 May 2024 08:21:55 GMT

Hi Marijn,

[quote user=""]1) Is SH_VTG needed? In other answers they say: connect it with VDD nRF.[/quote]

In the newer revisions, this is the SWD_SEL (as shown in the picture of the DK that you have attached) and if you are powering your external board from the DK, then you need to connect the VDD_nRF' to the SWD_SEL.

[quote user=""]2) What is the difference between VDDnRF and VDDnRF'?[/quote]

As mentioned above, the VDD_nRF' is the power domain of the entire DK and thus connect this to SWD_SEL in case you need to power the external board from the DK, whereas the VDD_nRF is the power domain of just the nRF52840 chip.

[quote user=""]3) To program a external nrf chip with the DK with 3.3V ; [/quote]

Please take a look at the NOTE mentioned in Product Specification:

[quote user=""]4) Why is pin 8 : SH_GND_DETECT Ground detect (P20) not printed on the pcb (version 3.0.2) ? Is it necessary to connect it? To where? [/quote]

In previous versions the GND_DETECT was used to select the voltage, whereas in the newer versions it's used to detect an external board. So you can directly connect the GND of the external board to the GND on the DK.

Regards,

Priyanka