Run uart example at 1.8v source

[RJD]

I want to run the board at 1.8V and run the uart and spi examples on my laptop. What should be my configurations and which micro-usb port shall I use to connect with laptop and PUTTY to test the data transfer?

Please let me know using the image attached as a reference- 

[Stian Røed Hafskjold]

If I understand you correctly you want to use high voltage mode, so that the VDDH on the nRF52 is powered with 5V and the VDD is regulated down to 1.8V. And you want to communicate with UART over USB at the same time.

First you can connect a USB cable to the nRF USB port. You will have to select the USB peripheral on the nRF52 to be used for the UART transmission.

Set the nRF source switch to USB in order to power the VDDH on the nRF52 with 5V from the USB. Now the VDD on the board will be 1.8V (default)

You will have to leave the USB IF MCU cable connected in order to power the rest of the board.