5 Replies Latest reply on Nov 5, 2020 2:45 AM by TeMa_2997106

    USB BC support

    TeMa_2997106

      I want to supply power the system via USB-BC.

      The configuration is as shown in the figure below.

       

      USB_BC.jpg

       

      If you have AC / DC, this is always the power source.

      The tablet becomes UFP and receives power.

       

      If there is no AC / DC, the tablet becomes DFP and supply power.

       

      If AC / DC is connected when AC / DC is not connected, the tablet wants to do Power Role Swap immediately with AC / DC as the source.

       

      In both cases, the tablet is always the Host.

       

      Is this configuration possible with CCGx?

       

      *USB-BC is used because the tablet does not support PD.

       

      Thanks,

      Tetsuo

        • 1. Re: USB BC support
          SananyaM_56

          Hi Tetsuo-san,

           

          Please confirm the following points-

          -The AC/DC supply will provide charging as per BC 1.2 DCP mode of 1.5A. In that case how will 5V/3A be provided to the tablet? Did you mean Type-C charging and not BC 1.2?

          -For changing the table role to UFP or DFP based on the connected supply, role swaps would be required which is possible only with USB PD.

          -The CCGx device could be configured as a DRP (with Try.Src set) to have the appropriate configuration based on power supply but then it would be fixed to be either a DFP, source or a UFP, sink.

           

          Best Regards,
          Sananya

          1 of 1 people found this helpful
          • 2. Re: USB BC support
            TeMa_2997106

            Sananya-san,

             

            Thank you for your comments.

            I will check power rale again.

             

            Thanks,

            Tetsuo

            • 3. Re: USB BC support
              TeMa_2997106

              Sananya-san,

               

              I reconfirmed.

               

              AC / DC supports USB-PD. Power is supplied from the AC / DC power supply to the adapter using the maximum type-C (USB-PD) standard.

              The supply and demand of tablets is the USB-BC standard.

               

              In this configuration, I want to switch between UFP / DFP with or without AC / DC power. It seems difficult to configure with USB-BC, but I think USB-PD is feasible. Is it correct?

               

              If yes, I think that it change the tablet to PD standard.

               

              Thanks,

              Tetsuo

              • 4. Re: USB BC support
                SananyaM_56

                Hi Tetsuo-san,

                 

                Yes, that is correct. The ports of the PD controller in the system can be set to DRP and based on the connected AC/DC power supply it could switch roles to source or sink. But the tablet would require to be the DFP always since it is a host as well as become a sink when the supply is connected, so port role swap would be needed which is possible only with USB-PD.

                 

                Best Regards,

                Sananya

                1 of 1 people found this helpful
                • 5. Re: USB BC support
                  TeMa_2997106

                  Sananya-san,

                   

                  Thank you very much.

                  I can understand very well.

                   

                  Thanks,

                  Tetsuo