Systems and methods for charging a chargeable USB device
First Claim
Patent Images
1. A universal serial bus (USB) device, comprising:
- a USB port on the USB device for coupling to a charging system, the USB port including a bus voltage (Vbus) connection, a positive data (D+) connection, and a negative data (D−
) connection;
wherein a bus voltage (Vbus) is used to charge the USB device, andwherein the USB device is configured to output a first voltage on the D+ connection and a second voltage on the D−
connection wherein both D+ and D−
are in a logic high range, and further configured to vary the first and second voltages when the USB device detects attachment to the charging system.
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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.
33 Citations
10 Claims
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1. A universal serial bus (USB) device, comprising:
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a USB port on the USB device for coupling to a charging system, the USB port including a bus voltage (Vbus) connection, a positive data (D+) connection, and a negative data (D−
) connection;wherein a bus voltage (Vbus) is used to charge the USB device, and wherein the USB device is configured to output a first voltage on the D+ connection and a second voltage on the D−
connection wherein both D+ and D−
are in a logic high range, and further configured to vary the first and second voltages when the USB device detects attachment to the charging system. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for detecting that a 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 (8, 9)
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10. A universal serial bus (USB) device, comprising:
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means for coupling a USB port on the USB device to a charging system, using a bus voltage (Vbus) connection, a positive data (D+) connection, and a negative data (D−
) connection;means for receiving the bus voltage (Vbus), wherein the bus voltage (Vbus) is used to charge the USB device; and means for outputting both D+ and D−
in a logic high state, and varying the first and second voltages to enable use of the Vbus to charge the USB device.
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Specification