Supply only my nrf52840 with minimum power consumption

RE: Supply only my nrf52840 with minimum power consumption

ElectroMax — Wed, 07 Mar 2018 18:23:39 GMT

Thank you for your answer. I think you're right. So my problem is solved.

RE: Supply only my nrf52840 with minimum power consumption

ElectroMax — Wed, 07 Mar 2018 18:20:51 GMT

Thanks for the help! Now it's all good for me.

RE: Supply only my nrf52840 with minimum power consumption

Bjørn Kvaale — Wed, 07 Mar 2018 11:59:20 GMT

Hi,

Sorry for the delayed response. I believe this devzone case could be useful for you. If you set SW10 located on the bottom left of the board to nRF instead of VEXT, you bypass everything on the board apart from the nrf52 chip. Also, remember to plug in the USB cable even if you power over P21. This is to ensure that everything else on the DK works like it should. Then, you should get similar values over P22 compared with P21.

Hope that helps!

RE: Supply only my nrf52840 with minimum power consumption

Alpha — Tue, 06 Mar 2018 09:58:15 GMT

I am currently working the same problem, what I found helpful is the following:

http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52/dita/nrf52/development/nrf52840_pdk/direct_supply.html

It says: "Since it is only the nRF52840 SoC that is supplied from this source, it is recommended to supply the VDD domain from a different source (coin cell battery or USB) to prevent the pins of the SoC to be connected to unpowered devices. To prevent leakage due to voltage differences, the board should be set in the nRF only mode."

For me this is the solution and resulted in a current drain of a few uA.

If you do not want to deal with all of this you need to create your own PCB with only a nRF and your power supply.

RE: Supply only my nrf52840 with minimum power consumption

ElectroMax — Tue, 06 Mar 2018 07:39:15 GMT

Can't anyone help me?

RE: Supply only my nrf52840 with minimum power consumption

ElectroMax — Thu, 01 Mar 2018 10:06:57 GMT

Yeah, I've seen it before.

I don't have any problems measuring the current, that unfortunately doesn't answer my question.

RE: Supply only my nrf52840 with minimum power consumption

TY — Thu, 01 Mar 2018 09:19:10 GMT

have you seen this description: