How to use nRF52840-DK with an external power supply?

[eye]

Hello,

Now,in my application I use to power the nRF52840 with a 3.3V external supply at the VDD pin.

I want to know how to set it, I want to power the nRF52840 with a 3.3V external supply at P21.

It does not energize in this setting.
Is there a missing or unnecessary settings?

・SB36 -> shorted
・SB39 -> shorted
・SW6 -> DEFUULT
・SW8 -> ON
・SW10 -> OFF

Best Regard.

eye

[Jared]

Hi,

How is SW9 configured?

Best regards

Jared 

[eye]

Hi,Jared

Thank you for reply

  SW9 =>VDD

Best regards

eye

[eye]

PCA10056 version
v 1.0.0
2018.51
683100802

[Jared]

Could you try changing the SB39 and SB36 to its default position of open. And then connect the external supply to P21. What voltage do you measure on the VDD pinout on the DK? Make sure that you only connect the external supply and no other power source. 

[eye]

We got new board. and confirmed.

There seems to be no problem in conclusion.

Factory default board, Available with an external power supply.

But When it’s execute Github’s demo program, the same things happened.

Is this program not available with external power supply?

https://github.com/NordicPlayground/nrf52-ble-image-transfer-demo/tree/master/pca10056

Remarks) I made that correction ,for SDK version is v15.3.0.

[Jared]

Hi,

The ble image transfer demo shouldn't be dependent on the power supply.

• Could you be more specific of what happens you execute the Github demo program?
• Do you measure any voltage on the VDD pin?
• What IDE are you using to program the chip?

Best regards

Jared