STM32G0 USB_DP/DM 3.3Volt

[New.Fish]

we are planning to use STM32G0 for our next generation design with its USB port, two application is considered:

1. Use it as VCP, the signal from PC is +5 Volt, but the MCU is +3.3 Volt, can the USB port DP/DM pin directly connect to MCU pins? or require 5 V to 3.3 Volt converter?
2. Use as a Mas storage class, connect to USB drive to read/write files. USB works with 5 Volt power, can USB work with 3.3 Volt power supply? if YES, then USB and MCU can share same power supply. Otherwise we will have another 5 Volt power on board which will introduce extra cost.

[waclawek.jan]

DM/DP signals are 3V, no level conversion needed.

VBUS is 5V, you have to supply it to USB device if you want to use the STM32 as Host.

JW

[New.Fish]

Thanks.

Is there any examples code about how to use VCP?