4 Replies Latest reply on Mar 31, 2019 5:55 PM by NaMo_1534561

    Recommended Power Supply Circuit Diagram for FX3S

    NaMo_1534561

      Hello,

       

      Is there a recommended power supply circuit diagram when using fx3S with self power?

      Please tell me about the processing of the VBUS and VBATT terminals.

       

      Best Regards,

      Naoaki Morimoto

        • 1. Re: Recommended Power Supply Circuit Diagram for FX3S
          HirotakaT_91

          Hello Morimoto-san,

           

          In terms of basic hardware design, please follow AN70707 - EZ-USBR FX3/FX3S Hardware Design Guidelines and Schematic Checklist.

           

          - CYUSB3KIT-003 is helpful as example circuit design, but as you know, it is not self-powered design, but bus-powered design.

          - Although we attached FX3S DVK which supports self-powered on FX3S web page, this board created by Pactron Inc. If they do not offer it, we cannot access to their schematic.

          - CYUSB3KIT-001 can work as self-powered device. As you know, however, this product has obsoleted. Cypress does not recommend it officially.

           

          Best regards,

          Hirotaka Takayama

          • 2. Re: Recommended Power Supply Circuit Diagram for FX3S
            NaMo_1534561

            Takayama-san,

             

            Thank you for your answer.

             

            I will suggest to customer the connection of power supply domains for self-powerd application.

            Please check below.

             

            VBAT --> Leave open

            VBUS --> Connect to VBUS of USB Type-A Plug.

            VIO_1 (GPIF)    --> connect to system power supply(1.8V to 3.3V)

            VIO_2 (S0 port) --> connect to system power supply(1.8V to 3.3V)

            VIO_3 (S1 port) --> connect to system power supply(1.8V to 3.3V)

            VIO_4 (S1 port and Low Speed Peripherals (UART/SPI/I2S)) --> connect to system power supply(1.8V to 3.3V)

            VIO_5 (I2C) --> connect to system power supply(1.8V to 3.3V)

            VDD  --> connect to system power supply(1.2V)

            AVDD --> connect to system power supply(1.2V)

            CVDDQ--> connect to system power supply(1.8V or 3.3V which clock required to)

            U3RXVDDQ --> connect to system power supply(1.2V)

            U3TXVDDQ --> connect to system power supply(1.2V)

             

            OTG_ID --> Leave open if application does not support On-the-Go.

             

            Best Regards,

            Naoaki Morimoto

            • 3. Re: Recommended Power Supply Circuit Diagram for FX3S
              HirotakaT_91

              Hi Morimoto-san,

               

              Thank you for sharing detailed information.

              Your suggestion seems good except VBATT setting.

               

              In case of the VBATT usage, CYUSB3KIT-001 schematic might be helpful.

               

              On your suggested power supply, FX3 is not supplied any power when USB (VBUS) is not connected to it.

              In case of self-powered device, VBATT can use for resolving above issue.

               

              Following graphics are excerpts of CYUSB3KIT-001 schematic.

               

              Best regards,

              Hirotaka Takayama

              • 4. Re: Recommended Power Supply Circuit Diagram for FX3S
                NaMo_1534561

                Takayama-san,

                 

                Thnak you for checking my suggestion and giving a feedback.

                I'm clear on this question by your answer.

                 

                Best Regards,

                Naoaki Morimoto