UART Rx and RX voltages

[bdoan]

I am using the PCA10040 nRF52DK board

I want to connect the UART RX and TX pins of the nRF52832 to my target CPU

I have cut the connections at SB16 and SB14

I can see data on the "unboard" side of SB16 when the device receives a BLE UART data.

Both SB16 and SB14 read 3.0V with no data being transmitted.

Is this correct?

Have I properly disconnected the nRF52832 from the ATSAM3U2 CPU?

I do not want to damage the nRF52832 when I connect to the UART port of my external CPU.

Please advise

[Jared]

Hi there,

I want to connect the UART RX and TX pins of the nRF52832 to my target CPU

You can always reassign the UART signals to other pins in your application, instead of change it physically. 

I have cut the connections at SB16 and SB14

Cutting SB16 and SB14 will only cut the UART signals to the header, it will not disconnect them from the interface chip. If you want the latter, then you have to cut SB22-SB25:

regards

Jared