Debug out port P20 on nrf52840-DK debugging custom board?

[gnrboy]

Is it enough just to connect from custom board to P20 header(nrf52840-dk) SWDIO, SWCLK, RESET, from custom board GND to P20( GND_DETECT) and power supply to custom board from external supply ( battery)?

 

[Øyvind]

Hello, 

Have a look at my colleague's answer in this thread.

Kind regards,
Øyvind

[gnrboy]

on P20 are two nRF VDD pins (2.8V DC),  on p1 header is VDD pin which have 2.8V DC. One of nRF VDD pins on P20 connect to VTG and other nRF VDD i can use for VCC of custom board? reset? I ask just to confirm because on post you have send me is nrf52 dk  board and i use nrf52840 DK

[Øyvind]

Yes, this connection is correct. 

[gnrboy]

Thank you. Can you maybe help me on https://devzone.nordicsemi.com/f/nordic-q-a/51139/analyzing-power-consumption-on-nrf52840-dk-with-keysight-n6705c

[gnrboy]

I have one more question about this topic. How to connect nrf52840-dk jlink programmer when custom board have their battery power ?

EDIT:

Any answer?

[gnrboy]

Can you maybe help how to connect custom board on p20 debug connector on nrf52840 DK when custom board have their own power supply.