feeding on external power supply and USB simultaneously

RE: feeding on external power supply and USB simultaneously

Amanda Hsieh — Fri, 20 Sep 2019 08:05:58 GMT

Hi,

Note that while SB12 is shorted, the dev kit must not be powered from USB if there is a battery or external supply connected because the protection diode has been bypassed. Also, note that the allowed voltage level on external supply pins is 1.7 V - 3.6 V.

[quote user=""] with this set up I am feeding on external power supply and USB both.[/quote]

Note: Connect only one power source at the time. Shorting the solder bridges removes the reverse voltage protection.

[quote user=""]Is there any solution that I can connect to my platform without feeding on USB?[/quote]

You can short SB10 to use a coin cell battery on the nRF52 DK.

-Amanda H.

RE: feeding on external power supply and USB simultaneously

awneil — Wed, 18 Sep 2019 17:53:31 GMT

I read it, but it's confusing.

RE: feeding on external power supply and USB simultaneously

fatemeh ghasemi — Wed, 18 Sep 2019 17:40:44 GMT

I think you don't read my answer I have the problem yet, my purpues for "it works " means sdk is working (regarding the links that you sent ) and ofcours I followed the user guides and schematics.

RE: feeding on external power supply and USB simultaneously

awneil — Wed, 18 Sep 2019 17:35:31 GMT

Again, you'd need to look at the schematics to see exactly what's going on.

Anyhow:

[quote userid="82326" url="~/f/nordic-q-a/52311/feeding-on-external-power-supply-and-usb-simultaneously/210515"]it works[/quote]

So mark the thread as solved by verifying the answer:

RE: feeding on external power supply and USB simultaneously

fatemeh ghasemi — Wed, 18 Sep 2019 17:26:40 GMT

Thank you for sending the links, but now I can use and run nRF5-SDK and it works. I am wondering when I followed the user guides exactly why it doesn't work. maybe there is something that I don't know.

RE: feeding on external power supply and USB simultaneously

awneil — Wed, 18 Sep 2019 17:11:48 GMT

pca10036 was the nRF52832 preview DK:

https://devzone.nordicsemi.com/f/nordic-q-a/26442/where-to-get-the-sdk-supporting-nrf52832-dk-pca10036/104044#104044

Note the comment there that it is, "not recommended for development. Please get a nRF52-DK (PCA10040)"

Also:

https://devzone.nordicsemi.com/f/nordic-q-a/17431/modify-pca10036-to-pca10040/66971#66971

"strongly recommended to switch to PCA10040"

Anyhow, I would still recommend looking at the schematic - so that you can see exactly what's going on, and work out how to achieve what you require.

RE: feeding on external power supply and USB simultaneously

fatemeh ghasemi — Wed, 18 Sep 2019 16:47:34 GMT

my platform is pca10036 and I changed according to nRF52_PDK_User_Guide_v1.2.

RE: feeding on external power supply and USB simultaneously

awneil — Wed, 18 Sep 2019 16:41:05 GMT

[quote userid="82326" url="~/f/nordic-q-a/52311/feeding-on-external-power-supply-and-usb-simultaneously"]nRF 52832 platform[/quote]

You mean the Nordic nRF52832-DK ?

Have you looked at the schematics ?