Segger Debug Out on DK can't see my target

[Bret Foreman]

I just got a new target board back from fab/assembly and I'm trying to use the debug out connector on the PCA10028 to program the new target.

My target is the NRF51822-CFAC-R

I've wired J19 on the DK as follows:

Pin 1 - tied to the same 3V supply that powers the DK and my target
Pin 2 - SWDIO (pin H2) on my target
Pin 3 - GND on my target
Pin 4 - SWDCLK (pin C8) on my target

In nRFgo Studio, I'm able to see the Segger on the DK but the Segger is not able to see my target device. Is there any additional setup I need to do on the DK in order to download to my device?

[MartinBL]

Hm... That's unfortunate. In the first link Asbjørn is actually referring to the same user guide as I did and it clearly states 3.0V. In the second link Asbjørn says "or close to", but I agree that "close to" is pretty ambiguous. Anyway I did a test with two nRF51 DKs, one acted as the debugger and the other one as the external board powered by the first one (as OP describes). The voltage on both boards were 2.88V and it worked just fine.