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Computer peripheral device and operating method thereof

  • US 8,688,888 B1
  • Filed: 12/31/2012
  • Issued: 04/01/2014
  • Est. Priority Date: 12/31/2012
  • Status: Active Grant
First Claim
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1. A computer peripheral device adapted to a computer system having a system-end connecting interface, comprising:

  • a device-end connecting interface detachably electrically connected to the system-end connecting interface, the device-end connecting interface comprising a power pin and a ground drain pin, wherein the power pin is electrically connected to a power source of the computer system;

    an impedance unit electrically connected to the power pin and the ground drain pin respectively, and the power pin generating a voltage level on the ground pin via the impedance unit when the power pin is electrically connected to the power source of the computer system; and

    a control unit, electrically connected to the conjunction node of the impedance unit and ground drain pin for determining a USB standard of the system-end connecting interface according to the voltage level of the ground drain pin;

    wherein the computer peripheral device is arranged such that when the ground drain pin floating, the voltage level of the ground drain pin is reduced to a ground voltage level.

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