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CGaud.1
CGaud.1
Visitor II
May 16, 2021 1:38 PM UTC
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stm32f3 USB D+ pull up resistor

I've designed a board with a stm32F302C8T6 but the MCU dosent show up on windows. I didn't have a pull up resistor on D+. Could it cause that problem or the pull up isint mandaatory?

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TDK
TDKBest answer
May 16, 2021 3:34 PM UTC

An external pullup is required on the STM32F3 series. It is mandatory per the USB specification. See:

https://www.st.com/resource/en/application_note/dm00296349-usb-hardware-and-pcb-guidelines-using-stm32-mcus-stmicroelectronics.pdf

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TDK
TDKBest answer
May 16, 2021 3:34 PM UTC

An external pullup is required on the STM32F3 series. It is mandatory per the USB specification. See:

https://www.st.com/resource/en/application_note/dm00296349-usb-hardware-and-pcb-guidelines-using-stm32-mcus-stmicroelectronics.pdf

"If you feel a post has answered your question, please click ""Accept as Solution""."
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