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Port power controller for USB hubs with legacy battery charge support

  • US 8,055,919 B2
  • Filed: 02/06/2009
  • Issued: 11/08/2011
  • Est. Priority Date: 02/06/2009
  • Status: Active Grant
First Claim
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1. An interface unit comprising:

  • interface circuitry including one or more data lines and at least one power line; and

    power management circuitry configured to control a supply of power to the at least one power line; and

    wherein in response to detecting a device has been connected to the interface circuitry, the interface unit is configured to;

    convey a first signature to the device via the one or more data lines; and

    in response to determining a predetermined response to the first signature is not received from the device;

    remove power from the power line;

    restore power to the power line at a first predetermined time subsequent to removing said power; and

    convey a second signature different from the first signature to the device at a second predetermined time subsequent to restoring said power.

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