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HD3SS3220: HD3SS3220IRNHR USB Type C MUX

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Replies: 8

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Part Number: HD3SS3220

Hi Team,

I am using in a new project the device: HD3SS3220IRNHR

Which is a USB Type C mux

When connecting a USB3 Thumb drive it detected as a Super Speed device

When I connecting the plug in 180deg polarity it recognized as an High Speed device

When I reconnecting the upstream or Reseting the Hub the Tomb drive is recognized as a Super Speed device,

 

It seems that the CC1 and CC2 are not recognized in active mode,

 

I also checked with oscilloscope the voltage level of one of the CC pins (CC2 I think),

The CC pin turn to low only when Detached and attached the upstream cable again or reseting the HUB for detecting properly

 

Please advise how can I recognized the device orientation actively,

 

Attached is the Schematics implementation,

 

Thanks,

Shlomi

Gen2 bu - USB Type C Mux 14 06 20.pdf

  • best way is to get a type-C cable and try with both orientation.

  • In reply to Brian Zhou:

    Hi Brian,

     

    I connected a Thumb drive Type C Super speed, isn’t the same?

     

    Please advise if need to configure by I2C for Dynamic operation,

     

    I also used Microchip USB3.1 hub with that TI chip but I don’t think this is the reason,

     

    Thanks,

    Shlomi

  • In reply to Shlomi Yehezkia:

    you have couple of Type-c ports, which port has issue? DFP or UFP?

    Also DIR should be 3.3v

  • In reply to Brian Zhou:

    The issue happens with the DFP ports,

    probably because when disconnecting the upstream the USB HUB is initialize the communication each time it sense the upstream VBUS attached / de-attached (on the pin VBUS_DETECT)

     

    about the DIR pin is confusing for what is the max voltage is allowed:

  • In reply to Shlomi Yehezkia:

    DIR should be 3.3v, its an error on datasheet

  • In reply to Brian Zhou:

    The DIR pin at the DFP ports are connected to 3.3V

    And in the Upstream port UFP is connected to 5V

     

    The problem is with the DFU ports which are not change state when connecting the Thumb drive in the opposite direction,

    However the UFP ports (with the DIR connected to 5V) is working in both directions (as I said it might because the HUB is initialized by the USB_DETECT pin)

     

    Thanks,

    Barak

  • In reply to barak nadav:

    For DFP, Vbus_det can not connect to Vbus directly.. A vbus switch is needed to control voltae to Vbus_det.. Vbu_det should be low, after an UFP is attached , ID goes low and turn on the Vbus switch to supply Vbus_det.

  • In reply to Brian Zhou:

    Thanks,

    Your comment was helpfull,

    Have a nice day,

    Barak

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