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Method and apparatus for operating a mobile communication device coupled with an external power supply for charging a battery of the mobile communication device

  • US 7,742,753 B2
  • Filed: 12/28/2005
  • Issued: 06/22/2010
  • Est. Priority Date: 12/28/2005
  • Status: Active Grant
First Claim
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1. A mobile communication device, comprising:

  • a battery having a battery voltage for powering the mobile communication device;

    a charge control circuit for charging the battery from an external power source;

    a digital subsystem powered by the battery voltage of the battery and enabled for operation only while the battery voltage is above a first level; and

    a radio frequency subsystem powered by the battery voltage of the battery and enabled for operation only while the battery voltage is above a second level;

    wherein the second level is higher than the first level.

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