DEVICE AND METHOD FOR BATTERY CHARGING
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Abstract
The invention relates to a method for detecting a charger on a serial data bus in a first device (8). The method comprises connecting (100) said first device to a second device via a serial data bus interface, measuring (104) logic voltage levels of first (D+) and second (D−) data lines of said serial data bus, and determining whether a battery (14) of said first device (8) may be charged from a power supply line (VBUS) of said serial data bus based on said measured logic voltage levels.
92 Citations
46 Claims
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1-33. -33. (canceled)
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34. A method comprising
connecting a first device to a second device via a serial data bus interface; -
connecting a first resistor between a reference voltage source and a first data line of said serial data bus, and connecting a second resistor between said reference voltage source and a second data line of said serial data bus; measuring voltage levels of said first and said second data lines of said serial data bus; and determining whether a battery of said first device may be charged from a power supply line of said serial data bus based on said measured voltage levels. - View Dependent Claims (35, 36, 37, 38, 39, 40)
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41. A method comprising
allowing at least one data line of a serial data bus to be driven to a high voltage level; -
supplying a predefined current on a power supply line of said serial data bus to a first device; determining the amount of current drawn by said first device; and driving all data lines of said serial data bus to a low voltage level if said amount of current drawn by said first device is within a certain range. - View Dependent Claims (42, 43)
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44. A device having a serial data bus interface and a rechargeable battery, comprising:
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at least a first and a second data line, a ground line and a power supply line; first and second resistors connected between said first and second data lines; a reference voltage source; measuring means adapted for measuring voltage states of said first and second data lines and a charging control block, adapted for deciding if a certain amount of current may be drawn from said power supply line, based on said voltage states obtained from said measuring means. - View Dependent Claims (45, 46)
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Specification