Method and apparatus for operating a mobile communication device coupled with an external power supply for charging a battery of the mobile communication device
First Claim
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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Abstract
A mobile communication device 100 has a digital subsystem (110) and a radio frequency subsystem (108), and is powered by a battery (102) which is charged via a charge control circuit (106) using an external power supply (104) connected to the mobile communication device in a single path configuration. The mobile communication device permits limited operation of the mobile communication device by a user while the battery voltage is sufficient to power the digital subsystem but not yet sufficient to power the radio frequency subsystem. The delay in operation is minimized, however, because once charging commences, the battery voltage rises sufficiently fast that, typically, by the time the digital subsystem is initialized, enabled, and powered up, the battery voltage will be sufficient to enable the radio frequency subsystem.
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Citations
15 Claims
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1. A mobile communication device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a mobile communication device while charging a battery of the mobile communication device, the battery having a battery voltage, comprising:
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connecting an external power source to the mobile communication device; charging the battery from the external power; while the battery voltage is below a first level, maintaining a digital subsystem and a radio frequency subsystem of the mobile communication device in an unenabled state; while the battery voltage is above the first level and below a second level, enabling the digital subsystem and maintaining the radio frequency subsystem in the unenabled state while charging the battery of the mobile communication device; and while the battery voltage is above the second level enabling both the digital and radio frequency subsystems while charging the battery of the mobile communication device; wherein the digital and radio frequency subsystems are both powered by the battery voltage. - View Dependent Claims (9, 10, 11)
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12. A method of operating a mobile communication device having a battery, the battery having a battery voltage, an external power supply initially coupled to the mobile communication device for charging the battery, the method comprising:
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disconnecting the external power source from the mobile communication device; if the battery voltage is above an upper level, maintaining both a digital subsystem in a powered up state and a radio frequency subsystem in a powered up state; if the battery voltage falls below the upper level, maintaining the digital subsystem in the powered up state and disabling the radio frequency subsystem; if the battery voltage falls below a lower level, disabling both the digital subsystem and radio frequency subsystem; while the battery voltage is above upper level, applying an upper regulated voltage to an oscillator providing a clock signal to the digital and radio frequency subsystems; and while the battery voltage is below the upper level, applying a lower regulated voltage to the oscillator. - View Dependent Claims (13, 14, 15)
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Specification