4 Replies Latest reply on Feb 17, 2017 3:45 PM by adam.amitchell_2228371

    CCG3 - CYPD3121 Questions.

    adam.amitchell_2228371

      Hello


      I previously made a support case to inquire about the CYPD2122, however I believe the CYPD3121 will better suit my needs. 

      My application is a USB-C PD powered LED lamp in a consumer/sink role only. I require 15V and approximately 1A from a USB-C PD source wall adapter to power my application. The CYPD3121 will be powered by VBUS and will enable the rest of the application circuit when VBUS = 15V.

      I would like to know: 

      - Is the CYPD3121 the most appropriate of the CCG3 series for my application? 

      - I see the CYPD3121's default firmware is the USB bootloader, does this mean I can program directly over a USB Type-A to Type-C cable my custom application firmware and PD settings via EZ-PD configuration utility? I am not sure and a bit confused if I initially need the SWD interface for programming. 

      - In the datasheet application examples I only see the CSA block connected to the Producer path. I wish to implement over current with the CYPD3121 saving BOM count, can I Interrupt Consumer Nfets using the CSA block connected to the consumer path? 

      - In the consumer role will the VBUS discharge circuit work on disconnect? I assume it would discharge until VBUS drops below the internal LDO's low voltage threshold and the chip shuts down. 

      - Do you have any consumer/sink reference designs I can source from? 



      Thank you, 

      Adam

        • 1. Re: CCG3 - CYPD3121 Questions.
          pati

          Hi 

             

          - Is the CYPD3121 the most appropriate of the CCG3 series for my application? 

             

          ANS) No I think CYPD3125 would be the best.

             

          - I see the CYPD3121's default firmware is the USB bootloader, does this mean I can program directly over a USB Type-A to Type-C cable my custom application firmware and PD settings via EZ-PD configuration utility? I am not sure and a bit confused if I initially need the SWD interface for programming. 

             

          ANS) Yes for default USB Boot loader you can update the firmware through USB. SDW interface may not be necessary.

             

          - In the datasheet application examples I only see the CSA block connected to the Producer path. I wish to implement over current with the CYPD3121 saving BOM count, can I Interrupt Consumer Nfets using the CSA block connected to the consumer path? 

             

          ANS) Yes you can do that, You need to update the firmware accordingly.

             

          - In the consumer role will the VBUS discharge circuit work on disconnect? I assume it would discharge until VBUS drops below the internal LDO's low voltage threshold and the chip shuts down. 

             

          ANS) Yes I think VBUS_Discharge circuit would be required.

             

          - Do you have any consumer/sink reference designs I can source from? 

             

          ANS) As far as I know, we don't have any circuit. Nevertheless you can take a DRP application and modify it to be consumer/Sink only. You can also reconfigure it by using EZ-PD configuration utility.

          • 2. Re: CCG3 - CYPD3121 Questions.
            adam.amitchell_2228371

            Ok,

               

            Why do you say the 3125 is the better choice? The only difference I see in the data sheet is that it has the I2C bootloader vs the 3121 with the USB bootloader, am I missing something?

               

             

               

            thanks.

            • 3. Re: CCG3 - CYPD3121 Questions.
              pati

              CYPD3121 is for power bank application and this project is not part of the SDK . I suggest CYPD3125 because this is a notebook project and it is available in the SDK, so you can do the project modification on your own easily.

              • 4. Re: CCG3 - CYPD3121 Questions.
                adam.amitchell_2228371

                OK, I have requested samples of the CYPD3125 for testing. 

                   

                 

                   

                Thank you.