Confused in VBATT&VBUS | Cypress Semiconductor
Confused in VBATT&VBUS
In AN70707.pdf（FX3 Hardware design guidelines...）, "VBATT is a power input to the USB PHY. It is
internally regulated to 3.3 V. When VBUS is greater than 3.7 V, VBUS becomes the primary supply to the USB
circuitry unless there is a software override. VBATT pin can be left open if not used."
I'm confused, please explain and provide an example.