I want to let nRF9160 communicate through UART with 3.3V logic level, but the logic level is originally 1.8V.
I have been reading nRF91_DK_User_Guide_v07.pdf, but I'm not really clear.
From the documentation:
You can set the VDD voltage to 1.8 V (default) or 3 V with SW11. Running 3 V GPIO with heavy load may degrade the LTE RF performance. For more information, see GPIO - General purpose input/output in the nRF9160 Objective Product Specification.
VDD powers most of the other circuits the board and will set the GPIO signal amplitude between nRF9160 and other circuits on the board including connectors and PIN headers.
Hi, Martin. Thank you for your reply.
Doesn't connecting 3V to 3.3V affect UART function? I never used 3V UART.