Systems and methods for detecting power sources
First Claim
1. A electronic circuit comprising:
- an interface controller having a power supply terminal, a ground terminal, first and second data terminals, and an output terminal coupled to a regulator; and
a detection circuit coupled to at least one data terminal;
wherein the first data terminal and the second data terminal are coupled to an external power source and the detection circuit senses the voltages on the first and second data terminals to determine the type of external power source.
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Abstract
Embodiments of the present invention include techniques for detecting power sources. In one embodiment, the present invention includes a method of detecting a power source comprising coupling a power source to a portable electronic device, the power source comprising a first supply voltage and a second supply voltage, and at least a first data terminal and a second data terminal, coupling a resistor to the first data terminal a predetermined time period after the power source is coupled to the electronic device, detecting the voltage on the first data terminal and second data terminal, and generating a first signal corresponding to a first power source if the first and second data terminals have the same voltage after said predetermined time period, and generating a second signal corresponding to a second power source if the first and second data terminals have differential voltages after said predetermined time period.
92 Citations
18 Claims
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1. A electronic circuit comprising:
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an interface controller having a power supply terminal, a ground terminal, first and second data terminals, and an output terminal coupled to a regulator; and a detection circuit coupled to at least one data terminal; wherein the first data terminal and the second data terminal are coupled to an external power source and the detection circuit senses the voltages on the first and second data terminals to determine the type of external power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of detecting a power source comprising:
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coupling a power source with an electronic device, the power source comprising a first supply voltage terminal, a second supply voltage terminal less than the first supply voltage terminal, a first data terminal, and a second data terminal; coupling a resistor to the first data terminal a predetermined time period after the power source is coupled to the electronic device; detecting the voltage on the first data terminal; and generating a first signal corresponding to a first power source if the first and second data terminals have the same voltage after said predetermined time period, and generating a second signal corresponding to a second power source if the first and second data terminals have differential voltages after said predetermined time period. - View Dependent Claims (10, 11, 12)
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13. A method of detecting a power source comprising:
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coupling a power source with a electronic device, the power source comprising a first supply voltage terminal, a ground terminal, a D+ data terminal, and a D−
data terminal;detecting that the power source is coupled to the electronic device; closing a switch a predetermined time period after detecting the power source, and in accordance therewith, coupling the first supply voltage to one of said data terminals; sensing the voltage on the data terminals; determining the type of the power source based on the sensed voltage; and configuring a battery charger in the electronic device to charge the battery according to the type of the power source. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification