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

  • US 20050189909A1
  • Filed: 12/30/2004
  • Published: 09/01/2005
  • Est. Priority Date: 02/17/2004
  • Status: Active Grant
First Claim
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1. A mobile device, comprising:

  • a universal serial bus (USB) interface for connecting the mobile device to a USB host;

    a processing device operable to execute programs and to control operation of the mobile device, the processing device being further operable to receive an enumeration acknowledgement signal from the USB host via the USB interface;

    a rechargeable battery for powering the processing device;

    a voltage regulator coupled to the USB interface and operable to receive a USB bus voltage from the USB interface and use the USB bus voltage to power the processing device;

    a timing circuitry operable to disable the voltage regulator from powering the processing device after a pre-determined amount of time has expired, the timing circuitry being operable to measure the passage of the pre-determined amount of time upon detecting the USB bus voltage; and

    a battery charger operable to receive the USB bus voltage from the USB interface and use the USB bus voltage to power the processing device and to charge the rechargeable battery;

    wherein the processing device enables the battery charger to power the processing device and to charge the rechargeable battery when the enumeration acknowledgement signal is received from the USB host.

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