RE: nRF52810 pin drives external board

Hieu — Tue, 18 Oct 2022 14:57:50 GMT

Hi ticture,

Regarding voltage level, unfortunately, a voltage drop will always be there due to the internal electrical characteristics of the pin. Therefore, you will not be able to have full 3V3 no matter if you use the pin as ground or source.

Considering the amount of drop you observe, your external board is probably not consuming so much current that it reached the pin limit. Therefore, the malfunction might be due to just the voltage drop, which will always be there.

[quote user=""]What should I do to solve it, [/quote]

Here are a couple of links you could refer to:

Discussion on using GPIO as power supply in eevblog.com, listing a number of things to consider:
https://www.eevblog.com/forum/microcontrollers/powering-devices-via-gpio-pins/

If you wish to adjust your external circuit so that the GPIO pin can support it, please keep in mind the Electrical Specifications of the GPIO peripheral for nRF52810:
https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf52810%2Fgpio.html&cp=4_5_0_5_7_2&anchor=unique_828906778

[quote user=""]do you have any other recommendations for a power supply that can control the switch?[/quote]

Unfortunately, we cannot give official IC recommendations. However, I found this Electronics StackExchange case where the external circuit requires more than the GPIO can support:
https://electronics.stackexchange.com/questions/30802/using-a-gpio-pin-as-a-power-source

By the way, this is not the current problem. However, please note that, for QFN48 and QFN32 nRF52810 variants, Pin 0.25 which you are using is recommended to be use as "low drive, low frequency I/O only" because it is close to radio pins. See the Pin Assignment page for nRF52810:
https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf52810%2Fpin.html&cp=4_5_0_6_0

Best regards,

Hieu

RE: nRF52810 pin drives external board

Hieu — Mon, 17 Oct 2022 23:58:37 GMT

Hi ticture, just want to let you know that I have received your case and will be back and supporting you shortly.

BR,

Hieu