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TUSB422: USB-C Charge-through

Michal Maciola
Prodigy 10 points
Part Number: TUSB422
Other Parts Discussed in Thread: TPS26750, , TUSB3410

Tool/software:

I am working on a device that connects to an Android smartphone via USB-C.
My goal is to achieve two things at the same time:

  1. Charge the Android device (5 V / 2 A).

  2. Exchange data over USB as a COM/UART device (so the phone remains the USB host).

From what I understand, this requires a charge-through / OTG + charging design.
A simple CC resistor setup is not enough - I need proper CC/PD role management so that the phone stays DFP (data host) while being Sink (powered/charging).

I’ve found references to controllers like TI TPS26750, TI TUSB422, but I haven’t yet located a complete reference schematic that shows power switches with discharge circuit and any demo code for microcontroller to advertise the right roles (data host + sink).

Could you point me to a reference design / evaluation board schematic that implements this?

I already requested TUSB422 software/TUSB422-DESIGN but it has been denied.

  • 0
    TI__Mastermind 38635 points

    Hi Michal,

    We do have an EVM for the TUSB422, I can provide the design files for that EVM if you'd like. One note on it is that the EVM does require an external microcontroller, like the MSP430 in order to properly function, as I2C communication is that primary way the device is controlled or communicated for the PD process.

    Michal Maciola said:
    Exchange data over USB as a COM/UART device (so the phone remains the USB host).

    Are you looking to send UART data through the type-C port? Do you plan on converting the data with a separate bridge? We have devices like the TUSB3410 which can act as a USB-UART bridge.

    I will send you a friend request over E2E, please accept that and I can send the EVM files over PM.

    Thanks,

    Ryan