RE: nRF52840 DK: Powering SoC with 1V8 while keeping board connected through USB

afarre — Tue, 15 Feb 2022 17:51:16 GMT

Thank you for the answer and sorry about I wasn't abe to find a similar post.

But I have to say it answers only partially may question by repeating what is said at User Gude:
"Please try the following setup: SW10 set to ON. USB connected to J2. SW9 set to VDD. P21 powered from an external 1.8V supply. SW6 set to default."

But I am also asking if doing that, NRF52840 is to be powered with 1.8V while it is to communicate with Intereface MCU at 3.0V. nRF52840 datasheet says at "Absolute maximum ratings" that max Vi/O is VDD+0.3. That means 2.1V when powered at 1.8V.

In brief, it seem that proposal does not meet nRF52840 spec.

RE: nRF52840 DK: Powering SoC with 1V8 while keeping board connected through USB

Kenneth — Tue, 15 Feb 2022 13:29:46 GMT

See here: https://devzone.nordicsemi.com/f/nordic-q-a/59679/using-the-nrf52840-dk-with-1-8v-io

Kenneth