US 9,804,984 B2Granted

Device and method for detecting types of universal serial bus cable

AssigneeRealtek Semiconductor Corp.

InventorKai-Yuan Yin

Life of this patent

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Abstract

A detection device for detecting types of a universal serial bus cable includes a detection circuit and a control unit. The detection circuit includes a signal source, a receiving end, a first resistor, a second resistor, a variable resistor, a first capacitor, a second capacitor, first through fourth switches, a VBUS end, an ID end, and a ground end. The signal source provides a detection signal. The control unit is electrically connected to the detection circuit, and is configured to control the first through the fourth switches according to a plurality of on-off states, to receive the detection signal and a VBUS signal from the receiving end in the plurality of on-off states, to generate a plurality of detection results, and to determine the type of the USB cable according to the plurality of detection results.

Claims12

Dependent claims

A device for detecting types of universal serial bus (USB) cable, applicable to determine types of a USB cable, the USB cable at least comprising a VBUS line and a ground line, an electronic device connected to another end of the USB cable opposing to the device for detecting types of USB cable, and providing a VBUS signal to the VBUS line, the device for detecting types of USB cable comprising:

a detection circuit, comprising:
a signal source, providing a detection signal;
a first resistor, having a first end and a second end, the first end connected to the signal source;
a variable resistor, having a first end and a second end, the first end of the variable resistor connected to the second end of the first resistors;
a second resistor, having a first end and a second end, the first end of the second resistor connected to the second end of the variable resistor, the second end of the second resistor connected to a ground end corresponding to the ground line;
a first capacitor, having a first end and a second end, the first end of the first capacitor connected to a first node between the variable resistor and the second resistor, the second end of the first capacitor connected to an ID end;
a second capacitor, having a first end and a second end, the first end of the second capacitor connected to a second node between the first resistor and the second resistor, the second end of the second capacitor connected to a VBUS end corresponding to the VBUS line;
a receiving end;
a first switch, connected between the second node and the receiving end;
a second switch, one end of which connected between the receiving end and the second end of the first switch, another end connected to the first node;
a third switch, connected in series between the first node and the first capacitor;
and
a fourth switch, connected in series between the first node and the first end of the second resistor;
and
a control unit, electrically connected to the detection circuit, configured to control the first switch, the second switch, the third switch and the fourth switch according to a plurality of on-off states, to control the variable resistor and the signal source to transmit the detection signal respectively corresponding to the plurality of on-off states, to receive the detection signal and the VBUS signal respectively from the receiving end during the plurality of on-off states, to generate a plurality of detection results and to determine types of the USB cable based on the plurality of detection results.

12 more elements

A method for detecting types of USB cable, the USB cable at least comprising a VBUS line and a ground line, an electronic device connected to one end of the USB cable, and providing a VBUS signal to the VBUS line, the method comprising the following steps:

connecting a detection circuit to another end of the USB cable opposing to the electronic device, wherein the detection circuit comprises:
a signal source, providing a detection signal;
a first resistor, having a first end and a second end, the first end connected to the signal source;
a variable resistor, having a first end and a second end, the first end of the variable resistor connected to the second end of the first resistors;
a second resistor, having a first end and a second end, the first end of the second resistor connected to the second end of the variable resistor, the second end of the second resistor connected to a ground end corresponding to the ground line;
a first capacitor, having a first end and a second end, the first end of the first capacitor connected to a first node between the variable resistor and the second resistor, the second end of the first capacitor connected to an ID end;
a second capacitor, having a first end and a second end, the first end of the second capacitor connected to a second node between the first resistor and the second resistor, the second end of the second capacitor connected to a VBUS end corresponding to the VBUS line;
a receiving end;
a first switch, connected between the second node and the receiving end;
a second switch, one end of which connected between the receiving end and the second end of the first switch, another end connected to the first node;
a third switch, connected in series between the first node and the first capacitor;
and
a fourth switch, connected in series between the first node and the first end of the second resistor;
electrically connecting a control unit to the detection circuit;
configuring the control unit to control the first switch, the second switch, the third switch and the fourth switch according to a plurality of on-off states;
configuring the control unit to control the variable resistor and the signal source to transmit the detection signal respectively corresponding to the plurality of on-off states;
configuring the control unit to receive the VBUS signal and the detection signal respectively from the receiving end in the plurality of on-off states, and to generate a plurality of detection results;
and
configuring the control unit to determine types of the USB cable based on the plurality of detection results.

16 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/073,036Filed 17 Mar 2016
Priority: CN 2015 1 011896918 Mar 2015
Published: US 2016/0274163 A122 Sep 2016
Granted: 31 Oct 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G06F 13/385
Using universal interface adapter: for adaptation of a particular data processing system to different peripheral devices
G06F 1/22
Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00: means for limiting or controlling the pin/gate ratio
G06F 1/26
Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00: power supply means, e.g. regulation thereof
G06F 1/266
Power supply means, e.g. regulation thereof: arrangements to supply power to external peripherals either directly from the computer or under…