USB VBus Monitoring Options | Cypress Semiconductor
USB VBus Monitoring Options
My device will be self-powered and thus will require VBus monitoring as discussed in the USB datasheet under ComponentParameters/AdvancedTab/EnableVBusMonitoring.
I understand the requirment.
What I am unsure of is the difference between the Internal and External VBus options. Both provide a pin to connect to (the host suppllied) VBus. The External option requires you to hook up that pin manually within the schematic.
Do they both require the resistor/cap network as shown in the diagram in the datasheet or is it just the External option? If they do then I don't understand why the two options exist.
Can someone give me a brief explanation as to the difference between the options?