公开(公告)号：US09772653B2

公开(公告)日：2017-09-26

申请号：US14692155

申请日：2015-04-21

Applicant: VIA TECHNOLOGIES, INC.

Inventor： Chin-Sung Hsu ,  Terrance Shiyang Shih ,  Li-Feng Pan

IPC: G06F13/40 ,  G06F1/16 ,  G06F1/26 ,  G06F1/00

CPC classification number: G06F1/1632 ,  G06F1/266 ,  G06F13/4081

Abstract: A Universal Serial Bus (USB) dock is provided. The USB dock includes: a plurality of downstream ports; and a upstream port, connecting the USB dock to a portable device, wherein the upstream port includes an On-the-go (OTG) ID pin and a differential pair; and a microcontroller, configured to detect operating states of the portable device, wherein when it is detected that the portable device is in a USB OTG host mode and has entered a suspend state, the microcontroller controls the portable device to switch from the USB OTG host mode to a USB device mode by toggling a state of the USB OTG ID pin, thereby charging the portable device via the upstream port.