Method and apparatus for handling a charging state in a mobile electronic device
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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Abstract
The present invention is directed at a method of handling a device charging state for a Universal Serial Bus (USB) connected mobile electronic device comprising the steps of sensing a presence of a bus voltage; sensing an enumeration acknowledgement signal between the device and a USB host; and transmitting a signal to instruct the device to enter the device charging state.
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Citations
11 Claims
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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:
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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. - View Dependent Claims (2, 3, 4)
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5. A mobile electronic device, comprising:
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a rechargeable power source; a processing device configured to control the operation of the mobile electronic device; a Universal Serial Bus (USB) interface for coupling the rechargeable power source and the processing device to a USB host; the processing device being coupled to the rechargeable power source and the USB interface, wherein the processing device receive power from the rechargeable power source and from the USB host via the USB interface; the USB interface being configured to detect that the mobile electronic device is in a device suspend state upon coupling of the USB interface to the USB host, and in response to detecting that the mobile electronic device is in the device suspend state when coupled to the USB host, power the processing device from the USB host for a predetermined time period while an enumeration request is transmitted to the USB host; and the USB interface being further configured to disable power to the processing device from the USB host if an enumeration acknowledgement is not received from the USB host within the predetermined time period. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification