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

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

Jared — Fri, 10 May 2019 11:38:51 GMT

Ok. This is probably due to the power requirements of the application. What external power source are you using on P21? A coin cell will not deliver enough for the application to run.

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

eye — Fri, 10 May 2019 01:14:55 GMT

Hi,

> It worked with the Li-Po battery connected to P27

=> Yes.It worked.

> did not work with external supply connected to P20?

with external supply connected to P21

=> It did not work.

with VIN3-5V connected to P20

=> It worked.

Best Regards.

eye

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

Jared — Thu, 09 May 2019 11:19:07 GMT

Ok, i'm not sure I understand. It worked with the Li-Po battery connected to P27, but did not work with external supply connected to P20?

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

eye — Tue, 07 May 2019 01:58:19 GMT

He, Sorry for the late reply.

> What power source are you using when it's not working?

I usually use VIN3-5V .

But , When measuring current,　　It is not recommended.



>Does this mean that it worked with the Li-Po battery connected to P27?
Yes.　
Instead of the　Li-Po　battery, P27 was powered by supplying 3.3 V from the regulated power supply.


Best regards.

eye

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

Jared — Fri, 26 Apr 2019 08:24:47 GMT

Hi,

What power source are you using when it's not working?

[quote user="eye"]

P27.Li-in connector(3.3V)

=> OK

[/quote]

Does this mean that it worked with the Li-Po battery connected to P27?

Best regards

Jared

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

eye — Thu, 25 Apr 2019 08:15:52 GMT

I checked additionally

P27.Li-in connector(3.3V)

=> OK

I think so, It is effective only when using 5 V power sources.

eye

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

eye — Thu, 25 Apr 2019 03:37:03 GMT

Hi,

I have two boards, so I will organize them once.

[Settings with differences]

Board_A
・circuit :SB40 ->cut , P22 -> shorted
(I was trying to use for comparison of voltage.I used it when I asked a question)
Board_B
・circuit :default. it's not modified at all
(New! I prepared to compare the action)

[Common settings]

IDE: SEGGER Embedded Studio for ARM 4.16
SDK:nRF5 SDK ver15.3
program: nrf52-ble-image-transfer-demo
=> The code has been modified by the SDK version upgrade.
(nrfx_power_clock.c -> nrfx_power.c)
Camera: Arducam Mini 2MP camera module (OV2640)
Camera's Wiring: I reference GitHub's readme.

-------

Q1) Could you be more specific of what happens you execute the Github demo program?
A1) Board_A and Board_B do the same action

[OK] VIN3-5V(3.3V) / J2.USB connector(5V)

Energize at 220mA.
LED_1 Keep on flashing.
Android_App can scan Board with BLE5.
Android_App can connect Board with BLE5.
Android_App can take camera's pictures and stream.

[NG] P21.eternal supply(3.3V) / Coin cell battery(3.0V)
=> Do not energize

Q2) Do you measure any voltage on the VDD pin?
=> No. Board_B's circuit has not been modified at all.

However, when measuring the voltage on the Board_A, it is the same as the A1.

--
Q3) What IDE are you using to program the chip?
A3) SEGGER Embedded Studio for ARM 4.16

Best Regards.

eye

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

Jared — Wed, 24 Apr 2019 11:54:09 GMT

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

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

eye — Wed, 24 Apr 2019 10:19:03 GMT

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.

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

Jared — Tue, 23 Apr 2019 09:04:22 GMT

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.

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

eye — Wed, 17 Apr 2019 10:42:29 GMT

PCA10056 version
v 1.0.0
2018.51
683100802

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

eye — Wed, 17 Apr 2019 10:09:19 GMT

Hi,Jared

Thank you for reply

SW9 =>VDD

Best regards

eye

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

Jared — Wed, 17 Apr 2019 09:22:01 GMT

Hi,

How is SW9 configured?

Best regards

Jared