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TUSB2077: How to control /PWRON signals?

Oleg Zilotin
Prodigy 10 points

Hi!
I would like to know how to control (switch Off/On) /PWRON1-7 signals on TUSB2077 USB HUB.
I use Windows XP.
Thanks.

  • 0
    TI__Guru* 76130 points

    Hello Oleg,

    the TUSB2077 will automatically de-assert the /PWRON# terminal when its corresponding /OVRCUR# terminal is asserted (when there is an over-current event).

    However, the hub will not assert back the /PWRON# signal just because the /OVRCUR# terminal is no longer asserted, in order for the hub to asser back the /PWRON# terminal the Host needs to do a series of checks that ensure the over-current condition is no longer present.

    The USB host uses the request SET_PORT_FEATURE() AND CLEAR_PORT_FEATURE to "switch on/off" a downstream port.

    Regards.