This package for this micro is a 36 pin WLCSP. The datasheet suggests on pg12 that it supports USB but not VDD_USB, unlike others in this range. Does this mean that the USB line voltage comes from normal VDD?
Indeed, for the devices were VDD_USB pin is not available, the USB transceiver and the two associated pads (PA11 and PA12) are powered by VDD;You may refer to the datasheet relevant to your device (table 79) to have more information about the USB electrical characterstics thar you should respect.
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