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HD3SS3220: Some questions about typical applications

Vayne Li
Expert 1050 points
Part Number: HD3SS3220


Tool/software:

Hi Teams,

The customer plans to make a USB computing power stick with a mux chip added in the middle:
1. They should be using DRP mode, right?
2. Does the USB2 interface need to include the chip code shown in the diagram? The customer's single board area is limited, and they try not to add it as much as possible. If it is necessary to add, please provide the recommended model of that chip
Thank you

  • 0
    TI__Mastermind 39705 points

    Hello,

    Vayne Li said:
    1. They should be using DRP mode, right?

    What is the intended application? Is it meant to be placed between a PC and an end device? Is it meant to connect to something like a notebook and provide functionality similar to a flash drive?

    DRP would mean that the port can act as both a source and a device. If the device is meant for a certain role, it would be better to set it to that role.

    Vayne Li said:
    2. Does the USB2 interface need to include the chip code shown in the diagram? The customer's single board area is limited, and they try not to add it as much as possible. If it is necessary to add, please provide the recommended model of that chip

    This specific device has two functions. One is for USB2 BC1.2 support, the other is to act as a VBUS switch. The main concern with the HD3SS3220 is that if configured as a DFP, the HD3SS3220 needs to be able to indicate when VBUS should be sent to the type-C port. It does this by connecting the ID pin of the HD3SS3220 to the EN pin of a VBUS switch, that way when the ID pin is pulled low, indicating VBUS should be sent, the VBUS switch will enable and send VBUS to the type-C connector.

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    TI__Mastermind 39705 points

    Hello,

    Closing thread due to inactivity. If you have any follow-up questions or concerns, feel free to reply.

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    Expert 1050 points

    Hi Ryan,

    Do I need to cross connect the RX/TX between this mux chip and the main chip on the board?

    Does the TX/RX between R1A (SOC) and HD3SS3220IRNHR need to cross at this position where both chips are laid out on the PCB?...

  • 0 in reply to Vayne Li
    TI__Mastermind 39705 points

    Hi Vayne,

    TX pins of the SOC should connect to the TX pins of the HD3SS3220, and the TX1/2 pins of the HD3SS3220 should connect to the TX1/2 pins of the Type-C connector.

    RX1/2 pins of the type-C connector should connect to the RX1/2 pins of the HD3SS3220, and the RX pins of the HD3SS3220 should connect to the RX pins of the SOC.

    Thanks,

    Ryan