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USB EZ-PD Type-C

Contributor II

Hello,

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

pastedImage_0.png

Best regards,

Yocchi

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1 Solution
Moderator
Moderator

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-k...

Best Regards,

Mallika

Mallika

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4 Replies
Moderator
Moderator

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-k...

Best Regards,

Mallika

Mallika

View solution in original post

Moderator
Moderator

Hello,

There is one more control signal:

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

Best Regards,

Mallika

Mallika
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Contributor II

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"

          pastedImage_1.png

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

          pastedImage_2.png

Can the SC8802 set the voltage only with this?

Best regards,

Yocchi

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Moderator
Moderator

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

Mallika
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