nRF51 DK - Program external target voltage range?

[gwayne]

I've just discovered that the Jlink LITE programmer can not program my custom PCB because it runs at 2.7V.

Does the nRF51-DK board support programming an external target at this voltage?

Thanks.

[Asbjørn]

The J-link on the nRF51-DK is a j-link lite and can only program at 3.3 V. It's a limitation on the kit and programmer. The alternative is to use level shifters or use a J-link pro that handles larger voltage range. Would it be possible to power your board temporarily with something closer to 3.3 V for programming?

[Richard Osterloh]

Could you perhaps give details as to how exactly to wire up an external device to this interface? What is the difference between using P19 and P20? Could you use nrfjprog to do programming and if so how would you select the external interface over the onboard one?

[Asbjørn]

Please have a look in chapter 5.10 of the nRF51-DK user guide.