NRF52840-DK Power From 5V Power Supply

RE: NRF52840-DK Power From 5V Power Supply

Turbo J — Sat, 06 Dec 2025 11:33:15 GMT

VDD (and voltage on GPIOs) must never reach 5V levels - see absolute maximum ratings in the PS. Your SPI slave will very likely need a level shifter.

If you run SoC in high voltage mode, you get 1V8 VDD by default. Other voltages need UICR to be set.

RE: NRF52840-DK Power From 5V Power Supply

Gmrck — Fri, 05 Dec 2025 19:35:01 GMT

Hi, Elfving,

Is it possible to power 5V to the nrf52840DK both SOC and MCU through USB J2? My goal is to drive the SOC in a HIGH Voltage mode. I can do it via the USB J3, however, the documentation also says it is possible to do with using USB J2. Could you please let me know the exact configuration? It doesn't work with USB connected to J2 and the SW9 at USB position at all. With USB at J2 and SW9 in VDD position the SOC is in a Normal mode.

RE: NRF52840-DK Power From 5V Power Supply

EAkeila — Wed, 05 Jan 2022 10:58:53 GMT

Ok, I'll give this a try. Thanks

RE: NRF52840-DK Power From 5V Power Supply

Elfving — Mon, 03 Jan 2022 12:18:25 GMT

Hello!

[quote user="EAkeila"]What I really want is to power it from 5V voltage.[/quote]

Then you could for instance connect the 5V to the VDD line instead of through the USB.

[quote user="EAkeila"]I already connected the USB to the J3 connector and I used the setup I mentioned above, it doesnt seem to work.[/quote]

For that way to work you'd have to flip the SW9 switch to USB.

Best regards,

Elfving

RE: NRF52840-DK Power From 5V Power Supply

EAkeila — Wed, 29 Dec 2021 23:04:22 GMT

Thanks Elfving for your reply. Currently when VDD is selected, the nRF chip is powered from 3 or 3.3V. What I really want is to power it from 5V voltage. I have another SPI circuit which is powered using 5V and I need the nRF SPI GPIO output voltage to match the other SPI circuit.

I already connected the USB to the J3 connector and I used the setup I mentioned above, it doesnt seem to work. So I'm not sure if this is the way to power the chip from 5V using the DK. or if there is another way. Thanks

RE: NRF52840-DK Power From 5V Power Supply

Elfving — Wed, 29 Dec 2021 12:21:43 GMT

Hello Ehad!

I am a little bit confused as what you are trying to do and what the issue is. If you want to use the programming and debugging chip along with the main nRF52840 then you should connect the USB connector to J2 and set SW9 to VDD. You can power just the nRF using J3 however, if that is what you prefer.

I should also mention that due to the holidays you might have to expect both limited help and slower responses on DevZone.

Best regards,

Elfving