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Method and apparatus for handling a charging state in a mobile electronic device

  • US 7,518,343 B2
  • Filed: 05/25/2004
  • Issued: 04/14/2009
  • Est. Priority Date: 05/27/2003
  • Status: Active Grant
First Claim
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1. A method for charging a mobile electronic device from a Universal Serial Bus (USB) host upon coupling the mobile electronic device to the USB host, comprising:

  • detecting that the mobile electronic device is in a device suspend state upon coupling of a USB interface of the device to the USB host;

    sensing an input voltage from the USB host;

    entering a device charging state in response to sensing the input voltage;

    powering a processing device in the mobile electronic device from the input voltage while the mobile electronic device is in the device charging state;

    enabling the processing device to receive and process control signals from the USB host;

    requesting enumeration from the USB host; and

    if an enumeration acknowledgement is not received from the USB host within a predetermined time period, then entering the device suspend state.

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