Low power connection detect method and system for USB charging

A USB hub has a USB hub controller, and an embedded controller, a USB port connector and associated port power control device and a controllable bypass switch providing a supply voltage to the USB port connector when the embedded controller enables it, a controllable voltage supply regulator unit pr...

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Bibliographic Details
Main Authors Chenault, Cecil G, Ghosh, Atish
Format Patent
LanguageEnglish
Published 15.05.2018
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:A USB hub has a USB hub controller, and an embedded controller, a USB port connector and associated port power control device and a controllable bypass switch providing a supply voltage to the USB port connector when the embedded controller enables it, a controllable voltage supply regulator unit providing a first output voltage which can be turned off and supplied to the port power control device, and a programmable current monitor circuit with a current sensor providing a second supply voltage to the monitor circuit, wherein during a low power mode, the USB hub controller and any port power control device are turned off and the monitor circuit is configured to provide the second supply voltage through the sensor and bypass switch to the USB connector and detects a current when a USB device is plugged into the USB port connector and wakes up the embedded controller.
Bibliography:Application Number: US201514826980