4 Replies Latest reply on Jul 17, 2020 12:14 AM by MallikaK_41

    Control signal from CYPD3171 to SC8802

    YoIs_1298666

      Hello,

       

      When changing the voltage of type-C, what signal is used to control from CYPD3171 to SC8802?

      Best regards,

      Yocchi

        • 1. Re: Control signal from CYPD3171 to SC8802
          MallikaK_41

          Hello,

           

          SC8802 is the bidrectional buck-boost regulator connected to the USB Type-C port.

          For CYPD3171 (Power Bank application) this part receives power from VBUS input and it controls the power supplied to the battery.

          The control signals are as follows:

          >>PWM_I- Current setting for SC8802

          >>EN - Enable SC8802

          >>FB- Voltage regulation feedback pin, directly connected.

           

          You can refer to the CCG3PA Evaluation Kit Guide for the schematics and description http://https://www.cypress.com/documentation/development-kitsboards/cy4532-ez-pd-ccg3pa-evaluation-kit

           

          Best Regards,

          Mallika

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          • 2. Re: Control signal from CYPD3171 to SC8802
            MallikaK_41

            Hello,

             

            There is one more control signal:

            >>DIR- It controls the charging and discharging direction control for SC8802.

             

             

            Best Regards,

            Mallika

            • 3. Re: Control signal from CYPD3171 to SC8802
              YoIs_1298666

              Hello Mallika-san,

               

              Thank you very much for your reply.

              From SC8802 datasheet, I can understand what you say.

               

              I checked the schematics in case of PA(Power Adapter) and observed the signals.

              [In case of PA (Power Adapter)]  from SC8802QDER

              DIR:   8802_DIR <- J9-1 <- J9-2 <- AXRES_P2.0 <- J10-15 || J11-15 <- CCG3PA_AXRES_P2.0 <- AXRES/P2.0

                        "High level with pull-up resistor:4.6V"

              EN:     8802_EN <- J10-8                                                   || J11-8 <- P1.1

                        "Low level with pull-up resistor:0V"

              PWM: SC8802_PWM_V <- J11-20                                       || No connection

                        "High level because of pull-up resistor:4.2V"

              IPWM:8802_PWM_I <- J10-12                                           || J11-12 <- P1.0

                        "approximately 4.5V with pull-up resistor"

               

              FB1:   FB1_88 <- 8802_FB <- J10-7                                   || J11-7 <- FB

                        A pulse occurs when we change the voltage.

                        for example

                        1. from "5000mV, 3000mA" to "12000mV, 1000mA"

                       

                        2. from "12000mV, 1000mA" to "5000mV, 3000mA"

                       

              Can the SC8802 set the voltage only with this?

               

              Best regards,

              Yocchi

               

               

               

               

              • 4. Re: Control signal from CYPD3171 to SC8802
                MallikaK_41

                Hello,

                 

                Yes, this much (EN,DIR,PWM,IPWM,FB) should be enough for SC8802.

                You can refer to the schematics for better understanding.

                 

                Best Regards,

                Mallika