NRF52840-DK Power From 5V Power Supply

[EAkeila]

Hi,

I'm trying to power the chip on the DK from 5V power supply. I connected the USB connector J3, and switched SW9 to "USB Source". However, it seems that this is somehow powered from 1.8V ( this is by monitoring the output voltage from GPIO). I need to use both the programming USB (J2) and the 5V power source. Thanks in advance.

Regards

Ehad

[Elfving]

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

[EAkeila]

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

[Elfving]

Hello!

EAkeila said:

What I really want is to power it from 5V voltage.

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

EAkeila said:

I already connected the USB to the J3 connector and I used the setup I mentioned above, it doesnt seem to work.

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

Best regards,

Elfving

[EAkeila]

Ok, I'll give this a try. Thanks