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STM32F401 on custom board. USB doesn't work

Question asked by Gabriele Adamo on Mar 24, 2017
Latest reply on Mar 29, 2017 by Gabriele Adamo

Hi everybody,

This is my first question, I really hope you can help.

I soldered a STM32F401RC on my custom board and I connected it to a mini-usb plug. In particular, I connected PA9 to Vbus, PA11 (configured as USB_OTG_FS_DM) to D- , PA12 (configured as USB_OTG_FS_DP) to D+, VSS to GND.

The USB doesn't work. Windows says "Unrecognized device" and the Vbus voltage is 1V instead of 5V.

What is wrong?

Thank you in advance.