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STM32F072xx USB Hardware

Question asked by jamieB on Jun 14, 2016
Latest reply on Jun 15, 2016 by Clive One

Where can I find info on hardware needed to run USB to my STM32F072CB?  
I found the reference design and read hardware getting started.  Neither specify how to get USB levels down from 5V to uC VDD.  5V can't go directly into VDDIO2 since max recommended value is +3.6V.  Do I just have to add hardware convert logic signals back and forth between VDD and 5V?  This seems inefficient.

In the reference design schematic USB_VDD seemingly comes from no where.  It just appears but it's not connected to any power supply or regulator in the schematic.  

Help to point me in the right direction is greatly appreciated.