1.8V logic level shifter to program nRF52840 via SWD

[Chu]

Hi 

I'm running nRF52840 MCU at 1.8V, and trying to use the dev kit (PCA10056) to program the external nRF52840 MCU.

According to the datasheet, the dev kit runs on 3V, so I need a 1.8V-3V logic level shifter. SWDIO or SWDCLK has either a pull up/down (13K) resistor buit-in, so I'm wondering if you can recommend a suitable level shifter in this case (TXS/TXB series from TI required higher pull-up/down resistance)? 

Thanks

Chu

[Kenneth]

Hello,

This is not something we have tried, I recommend to check out a j-link debugger/programmer from SEGGER that supports 1.8V:
https://www.segger.com/products/debug-probes/j-link/models/model-overview/ 

Best regards,
Kenneth