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TUSB4020BI: Configuration question for TUSB4020

Dean McDaniel
Prodigy 60 points
Part Number: TUSB4020BI


We plan to use the TUSB4020 in a embedded application.  One port will be externally available and the other port with have a fixed device attached.  How would you configure the part in this usage case?

  • 0
    TI__Guru 60870 points

    Dean,

    Functionally you can configure the hub using the pin settings (Fullpwrmgmtz, Ganged, PWRCTL POL and Battery Charging will all depend on the application.  If you are looking to get a USB-IF compliance logo on the application, you would need to use EEPROM or SMBUS to set the non-removable (internal) port via the register settings.

    Regards,

    JMMN

  • 0 in reply to JMMN
    TI__Guru 60870 points

    Also, please note that USB_VBUS should only be high when a powered host is connected to the hub.  We do not recommend attaching USB_VBUS to a power rail that is always on.

    Regards,

    JMMN