2 Replies Latest reply on Feb 22, 2019 3:41 AM by wichc_4022421

    USB PD with Dual UART Bridge

    wichc_4022421

      I am looking for an appropriate chip (or chips) for an upcoming project, and help would be much appreciated.

       

      Here are the requirements that I need to fulfill:

      • Be able to receive power as a downstream device at 5V/3.0A;
      • Be able to function as 2 USB-to-UART bridges;
      • Draw power only from the connection, i.e. automatically turn off when USB is disconnected;
      • Support USB Type-C receptacles.

       

      I am considering EX-PD CCG3 (in particular, CYPD3121-40LQXIT 40QFN) but an alternative with less moving parts would be great. I'm not sure if something like CY7C65215 + PD controller would be possible.

       

      Thank you in advance!

        • 1. Re: USB PD with Dual UART Bridge
          RajathB_01

          Hi,

           

          • Be able to receive power as a downstream device at 5V/3.0A

               > If it is only 5V, CCG2, CCG3 and CCG3PA can serve the purpose.

           

          • Be able to function as 2 USB-to-UART bridges

               > None of the Cypress PD controllers do USB-UART. You will have to use USB-UART + CYPDxxxx solution.

           

          Do you need 'Two' USB-UARTs? Then is the module you are developing gets two USB ports (and eventually two USB VBUS?).

           

          • Draw power only from the connection, i.e. automatically turn off when USB is disconnected

               > Supported by CCG2, CCG3, CCG3PA

           

          • Support USB Type-C receptacles.

               > Supported by all CCGx.

           

          I'm not sure if something like CY7C65215 + PD controller would be possible.

          > Yes it is possible.

           

          According to my understanding, you will be requiring PD controller only for handling Type-C receptacle flip. Please confirm that you will not be doing PD communication for higher power (>5V) negotiation / alternate mode.

           

          I am considering EX-PD CCG3 (in particular, CYPD3121-40LQXIT 40QFN) but an alternative with less moving parts would be great.

          > If VBUS is always 5 volts, I would recommend CCG2 + CY7C65215 = lowest footprint solution.

           

          Regards,

          Rajath

          • 2. Re: USB PD with Dual UART Bridge
            wichc_4022421

            Thanks for your help!