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TPD6S300A: Application for Docking Station

Che yi Su
Expert 1695 points
Part Number: TPD6S300A
Hi TI experts,
 We used TPD6S300A and followed Typical Application design (C_CCx short to RPD_Gx) for docking station. We have test cell phone by samsung S8, Xiaomi 8 and the VBUS will provide voltage due to "8.3.4 CC Dead Battery Resistors Integrated for Handling the Dead Battery Use Case in Mobile Devices" function. But Huawei P30 and Mate 20 VBUS no output voltage. As we know, their typeC protocol maybe is RT1711. Do you have experience or lesson learn for it? 
Below is RT1711 datasheet link.
www.richtek.com/.../DS1711P-00.pdf
  • 0
    TI__Expert 4455 points

    Hi,

    I wanted to let you know that our TPD6S300A expert is out of the office, he will be back in next week.

    Regards,

    Scott

  • 0 in reply to Scott T
    TI__Mastermind 30000 points

    Hello,

    Want to make sure that I understand the problem correctly. You are implementing the TPD6S300A into a docking station. You are connecting cell phones to the dock, where the phone is in a dead battery condition and the dock is providing VBUS. When you connect a Huawei P30 cell phone, the dock is unable to provide power on VBUS.

    Is this an accurate description?

    If so, would you be able to capture a PD log between the two devices during the failure and also share a schematic of your system?

  • 0 in reply to Adam Mc Gaffin
    Expert 1695 points

    Hi Adam,
    We need cell phone provide VBUS to docking station via RD=5.1k pull down. Docking station is like below.

  • 0 in reply to Che yi Su
    TI__Mastermind 30000 points

    Hello,

    If the docking station is presenting Rd of 5.1k ohm, then when a device is connected that can present an Rp, an implicit contract will be negotiated between the two devices and 5V will be presented on VBUS. If you know that the dock is presenting Rd, but when the phone is connected VBUS does not go to 5V, then you can infer that the phone is not presenting an Rp so the problem would be on the phone being connected and the dock.