Unable to program nRF51422_xxAC due to low voltage error

[bl0rch]

Hello,

I have been trying for days to program my nrf51422 project without much success. I am using a Jlink programmer. I have connected VTREF, GND, SWCLK and SWDIO from the JLINK Edu to the project. However, when I go to program the board using nrfjprog or NRFGO, I get the error "ERROR: Low voltage detected at the target. Please make sure the device is properly supplied."

I have measured the voltage I am suppling from the project to the programmer and it reads 3.3 volts. Is this high enough? Is there anything additional I need to do?

I am following the pinout from the JLink datasheet.

Any tips are very much appreciated. I'm running out of ideas here!

Cheers, Nick

[Mohsen_K]

I had the same exact problem. I found why that happens and I think it is a design flaw of the programmer! The only thing you need to do is to exchange the sides of the cable connecting board to the programmer! Although connectors on both sides are identical it matters which side of the cable goes where! 

[cweifeng]

Yes I actually resolve it due to the problem highlighted by you. the connectors pin assignment is actually completely being mirrorred at the other end of the cable.