Systems and Methods for Charging a Chargeable USB Device
First Claim
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.
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Citations
1 Claim
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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, 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.
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Specification