Programming nrf51822 - low voltage mode

[Marek Zak]

Hi, I'm developing custom PCB with nrf51822 (low voltage mode) and I have troubles with flashing the chip. I cannot see the chip in nRFgo Studio. I can flash original devboards without problems. I attached my board scheme.

I'm using J-Link LITE CortexM-9 programmer: www.segger.com/jlink-lite-cortexm.html

Can anyone see a bug in it? Is the chip well connected to "programming header" ?

Thanks for any answer

nRF51822_gatema.pdf

[Janek Mann]

Hi Marek,

the J-Link LITE only supports programming with VCC at 3.3V. You'd have to either get hold of a different programmer (for example the regular J-Link) or implement a level shifter for the SWD interface. Or maybe run the board at 3.3V during programming (but that might be tricky with the supply requirements of the 1.8V mode).

Cheers, Janek