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CGaud.1
CGaud.1
Visitor II
May 16, 2021
Solved

stm32f3 USB D+ pull up resistor

  • May 16, 2021
  • 1 reply
  • 712 views

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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Best answer by TDK

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

1 reply

TDK
TDKBest answer
May 16, 2021

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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