Systems and methods for charging a chargeable USB device
First Claim
1. A system for charging a universal serial bus (USB) device, comprising:
- a USB connector for coupling the system to a USB port on the USB device, the USB connector including a bus voltage (Vbus) connector, a positive data (D+) connector, and a negative data (D−
) connector;
charger circuitry configured to receive a source voltage and convert the source voltage into the bus voltage (Vbus), wherein the bus voltage (Vbus) is used to charge the USB device; and
presence detect circuitry configured to compare a first voltage present on the D+ connector with a second voltage present on the D−
connector while both D+ and D−
are in a logic high range, and further configured to use a detected difference between the first and second voltages in enabling use of the Vbus to charge the USB device.
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Abstract
Systems and methods are provided for charging a USB device. A USB connector may be used to couple the system to a USB port on the USB device, the USB connector including a bus voltage (Vbus) connector, a positive data (D+) connector, and a negative data (D−) connector. Charger circuitry may be used to receive a source voltage and convert the source voltage into the bus voltage (Vbus), wherein the bus voltage (Vbus) is used to charge the USB device. Presence detect circuitry may be used to compare a first voltage present on the D+ connector with a second voltage present on the D− connector in order to detect when the USB connector is coupled to the USB port of the USB device.
57 Citations
17 Claims
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1. A system for charging a universal serial bus (USB) device, comprising:
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a USB connector for coupling the system to a USB port on the USB device, the USB connector including a bus voltage (Vbus) connector, a positive data (D+) connector, and a negative data (D−
) connector;charger circuitry configured to receive a source voltage and convert the source voltage into the bus voltage (Vbus), wherein the bus voltage (Vbus) is used to charge the USB device; and presence detect circuitry configured to compare a first voltage present on the D+ connector with a second voltage present on the D−
connector while both D+ and D−
are in a logic high range, and further configured to use a detected difference between the first and second voltages in enabling use of the Vbus to charge the USB device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. In a system for charging a universal serial bus (USB) device, a method for detecting that the USB device is attached to a USB charger, comprising:
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generating a first USB data signal having a first voltage; generating a second USB data signal having a second voltage; wherein the first voltage and second voltage are both within a voltage range for a high logic state; comparing the first data signal with the second data signal to detect if the first voltage varies with respect to the second voltage; wherein the USB device causes the first voltage to vary with respect to the second voltage when the USB device detects it is attached to the USB charger. - View Dependent Claims (15, 16)
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17. A system for charging a universal serial bus (USB) device, comprising:
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means for coupling the system to a USB port on the USB device using a bus voltage (Vbus) connector, a positive data (D+) connector, and a negative data (D−
) connector;means for receiving a source voltage and converting the source voltage into the bus voltage (Vbus), wherein the bus voltage (Vbus) is used to charge the USB device; and means for comparing a first voltage present on the D+ connector with a second voltage present on the D−
connector while both D+ and D−
are in a logic high state, and further configured to use a detected difference between the first and second voltages in enabling use of the Vbus to charge the USB device.
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Specification