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Systems and methods for charging a chargeable USB device

  • US 20060181241A1
  • Filed: 02/15/2005
  • Published: 08/17/2006
  • Est. Priority Date: 02/15/2005
  • Status: Active Grant
First Claim
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1. A system for charging a universal serial bus (USB) device, comprising:

  • a USB connector for coupling the system to a USB port on the USB device, the USB connector including a bus voltage (Vbus) connector, a positive data (D+) connector, and a negative data (D−

    ) connector;

    charger circuitry configured to receive a source voltage and convert the source voltage into the bus voltage (Vbus), wherein the bus voltage (Vbus) is used to charge the USB device; and

    presence detect circuitry operable to compare a first voltage present on the D+ connector with a second voltage present on the D−

    connector in order to detect when the USB connector is coupled to the USB port of the USB device.

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