1 Reply Latest reply on May 25, 2020 8:22 PM by YiZ_31

    EZ-PD BCR - different behaviour Type-C vs. PD

    AlKo_4405501

      Hello,

       

      I'm using the CYPD3177 BCR Kit. I experience different behaviour of the DC_OUT port (controlled by P-MOSFET / VBUS_FET_EN) when I'm either using a PD capable source (PDO 5V 1A) or a 'simple' Type-C source (10k pull-ups on CC lines to 5V -> 5V 3A). I can read the PD_STATUS and the TYPE-C_STATUS registers via I2C. As far as I can tell the port controller detects the type-c source correctly (port is connected, source is attached, Rp of partner device suggests current level 3A, etc.).

       

      With the Type-C source the P-MOSFET is activated rather late. We are talking about approx. 3.5 seconds between making a connection and enabling the output.

      With the PD capable source the output is at 5V rather quick (< 1s).

       

      What are the conditions for the CYPD3177 port controller to activate the MOSFET / the power output?

       

      Is there a difference in decision making or with the timings based on the power source?

       

      Best regards
      Alexander

        • 1. Re: EZ-PD BCR - different behaviour Type-C vs. PD
          YiZ_31

          Hi Alexander,

           

          For a full-featured Type-C source with PD communication, the PD contract could be estbalished very quickly.

          For a dummy Type-C source with cc pulled up, it is not capable of PD communication. Then BCR have to wait for PD message until time out, then it will recognize it as a  dummy source.

           

          Regards,
          Eddie

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