RE: USB-C VBUS measurement

Sigurd Hellesvik — Mon, 29 Apr 2024 11:04:21 GMT

Hi,

[quote user=""]I want to measure VBUS without any external circuitry[/quote]

From zephyr,usb-c-vbus-adc: "Resistance of the lower leg of the voltage divider"

This means that you need a voltage divider, which is external circuitry.

I do not think you will be able to measure the voltage without any external circuitry with a nRF52840.

[quote user=""]do I need to sacrifice one or multiple pins for this purpose?[/quote]

From what I can see, you need 1 pin to measure the voltage. I suggest that you test the sample with a DK to be sure.

[quote user=""]CONFIG_DT_HAS_ZEPHYR_USB_C_VBUS_ADC_ENABLED[/quote]

This is automatically generated if you have enabled the DTS node.

[quote user=""]However, any of the above nodes make the build fail.[/quote]

I need a build log to be able to say what went wrong.

Regards,
Sigurd Hellesvik