This post is older than 2 years and might not be relevant anymore
More Info: Consider searching for newer posts

Programming a nRF51822 in low voltage mode with the SWD interface of the nRF51 DK

As explained by electronut in his Blog and Lijun here, it is possible to program an External nRF51822 board using the SWD interface of the nRF51-DK.

But what about a custom board using a nRF51822 in low voltage mode?

Are the four useful pins (SH_VTG, SH_SWDIO, SH_SWDCLK and SH_GND_DETECT) on a different voltage domain defined by voltage put on SH_VTG or are they using the same VIO than the all board?

Pinout of shield debug-out (P20) on nRF51-DK board

If the SDW interface can be used to program a nRF51822 board in low voltage mode I guess it is important to make sure that the custom board is powered on before it is connected to the SWD interface as SH_VTG is low and SH_GND_DETECT is high by default.

Anyway I just don't want to ruin the custom board I will soon received by experimenting somethings like that!

So here is my question: Is it safe to use directly this SWD inteface to program a Custom board in low voltage mode or should I use a level translator between the nRF51-DK and my board? Any other suggestion allowing me to use my Development kit to program my board?

Thanks

Parents Reply Children
No Data
Related