VBUS sensing Dedicate ping, "USB FS upstream port in self-powered applications"

FMaro.1 · ‎2020-05-16

Hi have the use a USB aplication with STM32L151CBT6ATR, but this uC have not a dedicated pin for VBUS sensing, how is the way to resolve that situation ?

I readed AN4879 and usb_20.pdf specification and not are cleare for me.

Much apreciate any solution

TDK · ‎2020-05-16

You can use any GPIO pin and ensure the voltage is sufficient before enabling USB, and trigger an interrupt when the voltage drops below a given amount to disable USB.

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FMaro.1 · ‎2020-05-16

An this solution have a direct support for USB FS library code generated for STM32CubeMX ?

TDK · ‎2020-05-16

Not sure, probably not.

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FMaro.1 · ‎2020-05-16

Thanks you for your answer