Accessory power management
First Claim
1. A method of operating a computing device, the method comprising:
- establishing a connection between the computing device and a power source via a cable;
receiving, by the computing device, an indication that the power source can supply current at a first level;
receiving, by the computing device, an indication that the cable can supply current at a lower, second level; and
drawing, by the computing device, a current having a limit equal to the lower second level.
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Accused Products
Abstract
Methods, apparatus, and circuits for managing power among portable computing devices and one or more accessories. One example provides commands to improve power management between a portable computing device and one or more accessories. Other examples provide commands that may allow a portable computing device to charge at a maximum available current level while providing an accessory with sufficient current for its proper operation. Another may help prevent a portable computing device from drawing a high level of current that could be detrimental to an accessory, while others provide commands that may allow a battery pack to instruct a portable computing device to not charge its internal battery. Another example may allow a portable computing device to determine which power supply among multiple power supplies should be used to power an accessory, while others may allow an accessory to retrieve charging current parameters from a portable computing device.
73 Citations
20 Claims
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1. A method of operating a computing device, the method comprising:
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establishing a connection between the computing device and a power source via a cable; receiving, by the computing device, an indication that the power source can supply current at a first level; receiving, by the computing device, an indication that the cable can supply current at a lower, second level; and drawing, by the computing device, a current having a limit equal to the lower second level. - View Dependent Claims (2, 3, 4, 5)
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6. A computing device, comprising:
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an interface configured to electrically couple to a cable; and a power managing element coupled to the interface and operable to; establish a connection with a power source via the cable; receive an indication that the power source can supply current at a first level; receive an indication that the cable can supply current at a lower, second level; and draw a current having a limit equal to the lower second level. - View Dependent Claims (7, 8, 9, 10)
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11. A method of operating a cable arranged between a power source and a computing device, the method comprising:
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communicating, from the power source to the computing device, an indication that the power source can supply current at a first level; determining a current limit of the cable at a lower, second level; and communicating an indication of the current limit of the cable to the computing device. - View Dependent Claims (12, 13, 14, 15)
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16. A cable, comprising:
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a first end configured to be coupled to a power source; and a second end configured to be coupled to a computing device, wherein the cable is operable to; communicate, from the power source to the computing device, an indication that the power source can supply current at a first level; determine a current limit of the cable at a lower, second level; and communicate an indication of the current limit of the cable to the computing device. - View Dependent Claims (17, 18, 19, 20)
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Specification