7 Replies Latest reply on Jul 8, 2015 5:02 AM by user_14586677

    USB VBus Monitoring Options

    user_120900302

       Hello folks,

         

      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?

         

      Thanks,
      Stephen