How to input 3.3V in VDD_GPIO on nRF9160 DK?

RE: How to input 3.3V in VDD_GPIO on nRF9160 DK?

Martin Lesund — Mon, 18 Mar 2019 10:22:26 GMT

Hi yusuke217,

Since the GPIOs is set to 3V, and I/O pin voltage is VDD_GPIO +/- 0.3V is absolute maximum ratings you should be good.

Also it's worth noticing that the GPIO Threshold is 0.7 x VDD for '1' and 0.3 x VDD for '0'.

RE: How to input 3.3V in VDD_GPIO on nRF9160 DK?

Yusuke — Fri, 15 Mar 2019 17:24:19 GMT

Hi, Martin. Thank you for your reply.

Doesn't connecting 3V to 3.3V affect UART function? I never used 3V UART.

RE: How to input 3.3V in VDD_GPIO on nRF9160 DK?

Martin Lesund — Fri, 15 Mar 2019 15:06:02 GMT

Hi yusuke217,

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.