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STM32F103 USB circuit

Question asked by Mohammad A on May 31, 2017
Latest reply on Jun 9, 2017 by Khouloud G

I am trying to make usb operate in STM32F103 but it seems doing so is a lot different than usb fs in STM32F4 series.

In F4 series it was just enough to connect usb connector to Data pins and MCU would take care of other parts. But in F103 series it is required to pull-up D+ with a resistor and also it is required to handle this pullup in different situations. From what I can find in the schematics of STLink, there is pin (USB_RENUMn) controlling this pullup resistor

ST link


Does anybody know how to handle this pull up resistor? I could not find out what to do with this USB_RENUMn thing.

You guys have any idea?