How to use the Battery on the nRF52840DK

[ravinp]

It looks like the DK comes with a coin cell type battery and there seems to be a tab that can be pulled off to activate. However I don;t see any mention of this in the documentation. Can someone explain how to switch into battery mode if I want to use the DK stand alone and how to switch between battery and drawing power from the USB connection or other sources when needed.

[Jared]

Hi,

This is documented on DocLib here.

Best regards

Jared 

[ravinp]

Thanks Jared. So to confirm - if I want to use the Coin Cell battery I just need to pull off the tab and move SW9 into the Li-Po position. Then to turn off I can move SW9 into the USB or VDD position? Also while the coin cell is activated I can still move the switch to VDD and continue debugging and developing? I just want to make sure I don;t damage anything by moving something into an incorrect setting.

[Jared]

Hi,

It is stated: "The nRF52840 System on Chip (SoC) has a high voltage buck regulator that can support up to 5 V input. In the VDD position, the SoC is powered either from the on-board buck regulator, coin cell battery, or external supply (P21)".

Which means that the switch should be pulled to VDD. Also, I recommend taking out the battery before you plug the device to USB. 

Best regards

Jared