CN107105175A - A kind of interface circuit, signal transmission apparatus and method - Google Patents
A kind of interface circuit, signal transmission apparatus and method Download PDFInfo
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- CN107105175A CN107105175A CN201710308760.2A CN201710308760A CN107105175A CN 107105175 A CN107105175 A CN 107105175A CN 201710308760 A CN201710308760 A CN 201710308760A CN 107105175 A CN107105175 A CN 107105175A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/268—Signal distribution or switching
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Power Sources (AREA)
- Information Transfer Systems (AREA)
Abstract
The invention discloses a kind of interface circuit, signal transmission apparatus and method.The interface circuit includes：USB Type C interface, signal shift switch, usb signal end, HDMI signal ends and Displayport signal ends, USB Type C interface, usb signal end, HDMI signal ends and Displayport signal ends are connected with signal shift switch respectively.The equipment to be connected signal type to be transmitted is detected by signal shift switch, one in usb signal end, HDMI signal ends and Displayport signal ends is connected with USB Type C interface, realize the compatible transmission of usb signal, HDMI signals or Displayport signals, save interface quantity, beneficial to minimizing and improving suitability, the voltage that it also avoid being directly compatible with causing is mismatched.
Description
Technical field
The present invention relates to interface circuit technical field, more particularly to a kind of interface circuit, signal transmission apparatus and transmission letter
Number method.
Background technology
Pursuit with people to hearing experience, HDMI (High Definition Multimedia
Interface, HDMI) and a kind of Displayport interfaces (high definition number determined by video electronic association
Word display interface standard, abbreviation DP interfaces) it is widely used as the video display interface of high speed.
At present, many application processors on the market are all integrated with HDMI interface, and HDMI interface is when in use
Circuit is simple, easy to use, but HDMI interface does not include inside USB Type-C standard agreement；And
DisplayPort interfaces can transmit the vision signal of high-resolution and high refresh rate as a kind of new high-speed video interface, and
And inside USB Type-C agreement, the audio-visual transmission standard that such as VESA (VESA) is announced
DisplayPort 1.3 and DisplayPort 1.31.4, has been supported by USD Type-C, Thunderbolt thunders and lightnings
Interface synchronization transmits video and data flow.
In order to save interface, meeting demand is simultaneously simultaneous with USB Type-C interfaces by HDMI and Displayport interfaces
Hold, however, because HDMI is different from DisplayPort interface level, being directly compatible with to cause to damage due to the mismatch of level
Bad interface or equipment.
The content of the invention
In view of prior art HDMI and Displayport interfaces can not be simultaneously compatible by USB Type-C interfaces
Problem, it is proposed that a kind of interface circuit, signal transmission apparatus and method of the invention, to overcome above mentioned problem or at least portion
Solve the above problems with dividing.
To achieve these goals, present invention employs following technical scheme：
According to one aspect of the present invention there is provided a kind of interface circuit, the interface circuit includes：USB Type-C connect
Mouth, signal shift switch, usb signal end, HDMI signal ends and Displayport signal ends, the USB Type-C interfaces,
Usb signal end, HDMI signal ends and Displayport signal ends are connected with the signal shift switch respectively；
The USB Type-C interfaces, for connecting equipment to be connected；
The signal shift switch, for after the USB Type-C interfaces connect the equipment to be connected, detecting institute
State the equipment to be connected signal type to be transmitted, according to testing result, by the usb signal end, HDMI signal ends and
One in Displayport signal ends and the USB Type-C orifices, pass through the USB Type-C interfaces and realize
The compatible transmission of usb signal, HDMI signals or Displayport signals.
Alternatively,
The signal shift switch is provided with voltage check device, and the voltage check device is connected to the USB Type-C
The SBU1 pins and SBU2 pins of interface；
The SBU1 pins and SBU2 pins of the USB Type-C interfaces are respectively used to the connection equipment HDMI to be connected
The SDA pins and SCL pins of interface, or, it is respectively used to connect the AUX_ of the Displayport interfaces of the equipment to be connected
P pins and AUX_N pins, or, it is hanging when connecting the USB interface of the equipment to be connected；
After the USB Type-C interfaces connect the equipment to be connected, the voltage check device obtains the USB
Magnitude of voltage on the SBU1 pins and SBU2 pins of Type-C interfaces, determines that the equipment to be connected will be passed by the magnitude of voltage
Defeated signal type.
Alternatively, the interface circuit also includes interface chip, and the interface chip connects the USB Type-C interfaces
CC1 pins and CC2 pins；
The signal shift switch is provided with voltage check device, and the voltage check device is connected to the USB Type-C
The SBU1 pins and SBU2 pins of interface；
The SBU1 pins and SBU2 pins of the USB Type-C interfaces are respectively used to the connection equipment HDMI to be connected
The SDA pins and SCL pins of interface, or, it is respectively used to connect the AUX_ of the Displayport interfaces of the equipment to be connected
P pins and AUX_N pins；
After the USB Type-C interfaces connect the equipment to be connected, the interface chip passes through the CC1 pins
The configuration information of the equipment to be connected is obtained with CC2 pins, detects whether the equipment to be connected will transmit usb signal；If
No, then the voltage check device obtains the magnitude of voltage on the SBU1 pins and SBU2 pins of the USB Type-C interfaces, leads to
Cross the magnitude of voltage and determine that the equipment to be connected signal to be transmitted is HDMI signals or Displayport signals.
Alternatively, the voltage check device is analog-digital converter, and the analog-digital converter is respectively connected to the USB
The SBU1 pins and SBU2 pins of Type-C interfaces.
Alternatively, when the signal shift switch detects the equipment to be connected and to transmit usb signal, by the USB
Tetra- passages of TX2+/TX2-, RX2+/RX2-, RX1+/RX1- and TX1+/TX1- of signal end respectively with the USB Type-C
Tetra- passage correspondences of RX2+/RX2-, TX2+/TX2-, TX1+/TX1- of interface and RX1+/RX1- are connected；
The signal shift switch detects the equipment to be connected when transmitting HDMI signals, by the HDMI signal ends
Tetra- passages of TX1+/TX1-, TX0+/TX0-, CLK+/CLK- and TX2+/TX2- respectively with the USB Type-C interfaces
Tetra- passage correspondences of RX2+/RX2-, TX2+/TX2-, TX1+/TX1- and RX1+/RX1- are connected；
The signal shift switch detects the equipment to be connected when transmitting Displayport signals, will be described
Tetra- passages of ML0+/ML0-, ML1+/ML1-, ML2+/ML2- and ML3+/ML3- of Displayport signal ends respectively with it is described
Tetra- passage correspondences of RX2+/RX2-, TX2+/TX2-, TX1+/TX1- of USB Type-C interfaces and RX1+/RX1- are connected.
According to another aspect of the present invention there is provided a kind of signal transmission apparatus, it is provided with the signal transmission apparatus
As above the interface circuit described in any one, the signal transmission apparatus is connected by the interface circuit with equipment to be connected, is realized
The compatible transmission of usb signal, HDMI signals or Displayport signals.
According to it is still another aspect of the present invention to provide a kind of method of signal transmission, this method includes：
USB Type-C interfaces, usb signal end, HDMI signal ends and Displayport signal ends are set；
Equipment to be connected is connected by the USB Type-C interfaces；
After connection, the equipment to be connected signal type to be transmitted is detected, according to testing result, by the usb signal
One in end, HDMI signal ends and Displayport signal ends and the USB Type-C orifices, pass through the USB
Type-C interfaces and the equipment transmission usb signal to be connected, HDMI signals or Displayport signals.
Alternatively, the detection equipment to be connected signal type to be transmitted, is specifically included：
The SBU1 pins and SBU2 pins of the USB Type-C interfaces are connected into the HDMI of the equipment to be connected respectively
The SDA pins and SCL pins of interface, or, the AUX_P that the Displayport interfaces of the equipment to be connected are connected respectively draws
Pin and AUX_N pins, or, it is hanging when connecting the USB interface of the equipment to be connected；
The magnitude of voltage on the SBU1 pins and SBU2 pins of the USB Type-C interfaces is obtained, it is true by the magnitude of voltage
The fixed equipment to be connected signal type to be transmitted.
Alternatively, the detection equipment to be connected signal type to be transmitted, is specifically included：
The SBU1 pins and SBU2 pins of the USB Type-C interfaces are connected into the HDMI of the equipment to be connected respectively
The SDA pins and SCL pins of interface, or, the AUX_P that the Displayport interfaces of the equipment to be connected are connected respectively draws
Pin and AUX_N pins；
The configuration information of the equipment to be connected, inspection are obtained from the CC1 pins and CC2 pins of the USB Type-C interfaces
Survey whether the equipment to be connected will transmit usb signal；If it is not, the SBU1 for then further obtaining the USB Type-C interfaces draws
Magnitude of voltage on pin and SBU2 pins, determines that the equipment to be connected signal to be transmitted is HDMI signals by the magnitude of voltage
Or Displayport signals.
Alternatively, it is described according to testing result, by usb signal end, HDMI signal ends and Displayport signal ends
One and the USB Type-C orifices, are specifically included：
When detecting the equipment to be connected and transmitting usb signal, by TX2+/TX2-, the RX2+ at the usb signal end/
Tetra- passages of RX2-, RX1+/RX1- and TX1+/TX1- respectively with RX2+/RX2-, TX2+ of the USB Type-C interfaces/
Tetra- passage correspondences of TX2-, TX1+/TX1- and RX1+/RX1- are connected；
When detecting the equipment to be connected and transmitting HDMI signals, by TX1+/TX1-, TX0 of the HDMI signal ends
Tetra- passages of +/TX0-, CLK+/CLK- and TX2+/TX2- respectively with RX2+/RX2-, TX2+ of the USB Type-C interfaces/
Tetra- passage correspondences of TX2-, TX1+/TX1- and RX1+/RX1- are connected；
When detecting the equipment to be connected and transmitting Displayport signals, by the Displayport signal ends
The RX2 of tetra- passages of ML0+/ML0-, ML1+/ML1-, ML2+/ML2- and ML3+/ML3- respectively with the USB Type-C interfaces
Tetra- passage correspondences of +/RX2-, TX2+/TX2-, TX1+/TX1- and RX1+/RX1- are connected.
In summary, the present invention detects the equipment to be connected signal type to be transmitted by signal shift switch, and USB is believed
One in number end, HDMI signal ends and Displayport signal ends with USB Type-C orifices, pass through the USB
Type-C interfaces realize the compatible transmission of usb signal, HDMI signals or Displayport signals, save interface quantity, have
Beneficial to the miniaturization of equipment, suitability is improved, meanwhile, by selecting corresponding signal path to be connected, it also avoid directly
The voltage mismatch problem that compatibility is caused, can avoid voltage from mismatching the interface caused or device damage.
Brief description of the drawings
Fig. 1 is the structural representation of interface circuit one embodiment of the present invention；
Fig. 2 is the connection line schematic diagram that interface circuit one embodiment of the present invention connects equipment to be connected；
Fig. 3 is the structural representation of another embodiment of interface circuit of the present invention；
Fig. 4 is each signal end of interface circuit of the present invention and the annexation schematic diagram of USB Type-C interfaces；
Fig. 5 is the schematic flow sheet of method for transmitting signals one embodiment of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
Embodiment 1
Fig. 1 is the structural representation of interface circuit one embodiment of the present invention, with reference to Fig. 1, a kind of interface circuit, the interface
Circuit includes：USB Type-C interfaces 110, signal shift switch 120, usb signal end 130, the and of HDMI signal ends 140
Displayport signal ends 150, USB Type-C interfaces 110, usb signal end 130, the and of HDMI signal ends 140
Displayport signal ends 150 are connected with signal shift switch 120 respectively.
USB Type-C interfaces 110, for connecting equipment to be connected.
Wherein, the USB Type-C interfaces of adaptation are provided with equipment to be connected, for example, this interface circuit uses USB
Type-C females, then equipment to be connected is using USB Type-C males, and the equipment to be connected signal to be transmitted can be USB letters
Number, any of HDMI signals and Displayport signals.
Signal shift switch 120, for after USB Type-C interfaces 110 connect equipment to be connected, detecting to be connected set
The standby signal type to be transmitted, according to testing result, by usb signal end 130, HDMI signal ends 140 and Displayport signals
End 150 in one connected with USB Type-C interfaces 110, by USB Type-C interfaces 110 realize and equipment to be connected it
Between usb signal, HDMI signals or Displayport signals compatible transmission.
The equipment to be connected signal type to be transmitted is detected by signal shift switch 120, passed according to equipment to be connected
Defeated signal type, by corresponding signal end in usb signal end 130, HDMI signal ends 140 and Displayport signal ends 150
Connected with USB Type-C interfaces 110, formed transmission channel, by a USB Type-C interface 110 realize usb signal,
The compatible transmission of HDMI signals or Displayport signals, saves interface quantity, so that using the USB Type-C of the present invention
Interface, is conducive to the miniaturization of equipment, improves suitability, meanwhile, pass through the control signal path of signal shift switch 120
Connection, the voltage that it also avoid being directly compatible with causing mismatches, it is to avoid the problem of interface or equipment are burnt out.
Preferably, the structural representation with reference to shown in Fig. 1, signal shift switch 120 is provided with voltage check device 121, electricity
Pressure detection means 121 is connected to the SBU1 pins and SBU2 pins of USB Type-C interfaces 110.
The SBU1 pins and SBU2 pins of USB Type-C interfaces 110 are respectively used to connect equipment HDMI to be connected
SDA pins and SCL pins, or, be respectively used to connect equipment to be connected Displayport interfaces AUX_P pins and
AUX_N pins, or, it is hanging when connecting the USB interface of equipment to be connected.Specific connection line, is referred to shown in Fig. 2
Interface circuit of the present invention and the connection line schematic diagram of equipment to be connected, wherein, the HDMI of equipment to be connected,
Displayport interfaces and USB interface are the interface of USB Type-C forms, but in the interface of the USB Type-C forms
Transmission is respectively HDMI signals, Displayport signals and usb signal.
After USB Type-C interfaces 110 connect equipment to be connected, voltage check device 121 obtains USB Type-C interfaces
Magnitude of voltage on 110 SBU1 pins and SBU2 pins, the equipment to be connected signal type to be transmitted is determined by magnitude of voltage.
After USB Type-C interfaces 110 are connected with equipment to be connected, the magnitude of voltage meeting on its SBU1 pin and SBU2 pins
Conversion is produced, it is specific as follows：
Due to being provided in HDMI agreements, system power supply is 5V, so SDA pins and SCL pins need to be pulled upward to 5V, because
This, if the magnitude of voltage for detecting SBU1 pins and SBU2 pins is 5V, can determine that the equipment to be connected signal to be transmitted is
HDMI signals；
Due to being provided in Displayport agreements, DP_PWR is 3.3V, so AUX_P pins and AUX_N pins are
3.3V, therefore, if the magnitude of voltage for detecting SBU1 pins and SBU2 pins is 3.3V, can determine that equipment to be connected will be transmitted
Signal be signal Displayport signals；
During due to transmission usb signal, SBU1 pins and SBU2 pins are hanging, therefore, if detecting SBU1 pins and SBU2
The magnitude of voltage of pin is 0V, then it is signal usb signal that can determine the equipment to be connected signal to be transmitted.
Accordingly, detected by primary voltage, so that it may judge this connection signal type to be transmitted, then, signal is cut
Change switch 120 just to turn on the transmission channel between corresponding signal end and USB Type-C interfaces 110, realize corresponding signal
Transmission, due to being not in the situation of different types of signalling channel concatenation, would not also cause voltage to mismatch, cause interface
Or equipment burnout.
Embodiment 2
Fig. 3 is the structural representation of another embodiment of interface circuit of the present invention, and the interface circuit of the embodiment 2 includes
USB Type-C interfaces 310, signal shift switch 320, usb signal end 330, HDMI signal ends 340 and Displayport signals
End 350, USB Type-C interfaces 310, usb signal end 330, HDMI signal ends 340 and Displayport signal ends 350 are distinguished
It is connected with signal shift switch 320.
Wherein, difference from Example 1 is, the interface circuit also includes interface chip 360, and interface chip 360 is used
Whether it is usb signal in the detection signal to be transmitted, is detected in interface chip 360 after the signal to be transmitted is not usb signal,
Detect that the signal to be transmitted is HDMI signals or Displayport signals by signal shift switch 330 again.
Specifically, with reference to Fig. 3, the CC1 pins and CC2 pins of the connection USB Type-C of interface chip 360 interfaces 310 should
Interface chip 360 can be CC logic detections well known to those skilled in the art and control chip, can realize the inspection of USB connections
Survey and manage, will not be repeated here.
Signal shift switch 320 is provided with voltage check device 321, and voltage check device 321 is connected to USB Type-C and connect
The SBU1 pins and SBU2 pins of mouth 310.
The SBU1 pins and SBU2 pins of USB Type-C interfaces 310 are respectively used to connect equipment HDMI to be connected
SDA pins and SCL pins, or, be respectively used to connect equipment to be connected Displayport interfaces AUX_P pins and
AUX_N pins.
After USB Type-C interfaces 310 connect equipment to be connected, interface chip 360 is obtained by CC1 pins and CC2 pins
The configuration information of equipment to be connected is taken, detects whether equipment to be connected will transmit usb signal；If it is not, then voltage check device 321
The magnitude of voltage on the SBU1 pins and SBU2 pins of USB Type-C interfaces 310 is obtained, equipment to be connected is determined by magnitude of voltage
The signal to be transmitted is HDMI signals or Displayport signals.
Accordingly, the judgement twice of interface chip 360 and signal shift switch 320 is passed through, you can determine the letter to be transmitted
Number type.
In above-described embodiment 1 and embodiment 2, voltage check device 121 and voltage check device 321 are analog-to-digital conversion
Device, for example, correspond to a USB Type-C interface and set two analog-digital converters, the SBU1 pins and SBU2 pins being respectively connected to.
In above-described embodiment 1 and embodiment 2, signal shift switch 120 and the switching of the control signal of signal shift switch 320
When, the signal transmission passage of foundation is identical, the annexation schematic diagram with reference to shown in Fig. 4, herein by taking embodiment 1 as an example, is specially：
Signal shift switch 120 detects equipment to be connected when transmitting usb signal, by the TX2+ at usb signal end 130/
Tetra- passages of TX2-, RX2+/RX2-, RX1+/RX1- and TX1+/TX1- respectively with the RX2+ of USB Type-C interfaces 110/
Tetra- passage correspondences of RX2-, TX2+/TX2-, TX1+/TX1- and RX1+/RX1- are connected；
Signal shift switch 120 detects equipment to be connected when transmitting HDMI signals, by the TX1 of HDMI signal ends 140
Tetra- passages of +/TX1-, TX0+/TX0-, CLK+/CLK- and TX2+/TX2- respectively with the RX2+ of USB Type-C interfaces 110/
Tetra- passage correspondences of RX2-, TX2+/TX2-, TX1+/TX1- and RX1+/RX1- are connected；
Signal shift switch 120 detects equipment to be connected when transmitting Displayport signals, by Displayport
Tetra- passages of ML0+/ML0-, ML1+/ML1-, ML2+/ML2- and ML3+/ML3- of signal end 150 connect with USB Type-C respectively
RX2+/RX2-, TX2+/TX2-, TX1+/TX1- and tetra- passages correspondences of RX1+/RX1- of mouth 110 are connected.
Embodiment 3
The invention also discloses a kind of signal transmission apparatus, as above any embodiment institute is provided with the signal transmission apparatus
The interface circuit shown, the signal transmission apparatus is connected by interface circuit with equipment to be connected, realizes usb signal, HDMI signals
Or the compatible transmission of Displayport signals.The signal transmission apparatus can be the output equipment coordinated with helmet, and this is defeated
Go out equipment and pass through interface circuit disclosed above, it is possible to be respectively used to helmet and the transmission of connection transmission HDMI signals
The helmet of Displayport signals, improves the suitability of the output equipment, also saves interface quantity.
Embodiment 4
The invention also discloses a kind of method for transmitting signals, Fig. 5 shows for the flow of the method for transmitting signals one embodiment
It is intended to, this method includes：
Step S510：USB Type-C interfaces, usb signal end, HDMI signal ends and Displayport signal ends are set.
Step S520：Equipment to be connected is connected by USB Type-C interfaces.
Step S530：After connection, the equipment signal type to be transmitted to be connected is detected, according to testing result, by usb signal
One in end, HDMI signal ends and Displayport signal ends and USB Type-C orifices, are connect by USB Type-C
Mouth and equipment to be connected transmission usb signal, HDMI signals or Displayport signals.
Preferably, the equipment signal type to be transmitted to be connected is detected, is specifically included：
The SBU1 pins and SBU2 pins of USB Type-C interfaces are connected to the SDA of the HDMI of equipment to be connected respectively
Pin and SCL pins, or, the AUX_P pins and AUX_N pins of the Displayport interfaces of equipment to be connected are connected respectively,
Or, it is hanging when connecting the USB interface of equipment to be connected；On the SBU1 pins and SBU2 pins for obtaining USB Type-C interfaces
Magnitude of voltage, the equipment to be connected signal type to be transmitted is determined by magnitude of voltage.
Preferably, the equipment signal type to be transmitted to be connected is detected, is specifically included：
The SBU1 pins and SBU2 pins of USB Type-C interfaces are connected to the SDA of the HDMI of equipment to be connected respectively
Pin and SCL pins, or, the AUX_P pins and AUX_N pins of the Displayport interfaces of equipment to be connected are connected respectively；
The configuration information of equipment to be connected is obtained from the CC1 pins and CC2 pins of USB Type-C interfaces, whether equipment to be connected is detected
Transmit usb signal；If it is not, the magnitude of voltage on the SBU1 pins and SBU2 pins of USB Type-C interfaces is then further obtained,
Determine that the equipment to be connected signal to be transmitted is HDMI signals or Displayport signals by magnitude of voltage.
Preferably, according to testing result, by one in usb signal end, HDMI signal ends and Displayport signal ends
With USB Type-C orifices, specifically include：
When detecting equipment to be connected and transmitting usb signal, by TX2+/TX2-, RX2+/RX2-, the RX1 at usb signal end
RX2+/RX2-, TX2+/TX2-, the TX1+/TX1- of tetra- passages of +/RX1- and TX1+/TX1- respectively with USB Type-C interfaces
It is connected with tetra- passage correspondences of RX1+/RX1-；When detecting equipment to be connected and transmitting HDMI signals, by HDMI signal ends
Tetra- passages of TX1+/TX1-, TX0+/TX0-, CLK+/CLK- and TX2+/TX2- respectively with the RX2+ of USB Type-C interfaces/
Tetra- passage correspondences of RX2-, TX2+/TX2-, TX1+/TX1- and RX1+/RX1- are connected；Detecting equipment to be connected will transmit
During Displayport signals, by ML0+/ML0-, ML1+/ML1-, ML2+/ML2- and ML3+ of Displayport signal ends/
RX2+/RX2-, TX2+/TX2-, TX1+/TX1- and the RX1+/RX1- tetra- of tetra- passages of ML3- respectively with USB Type-C interfaces
Bar passage correspondence is connected.
The above method is corresponding identical with the scheme of said interface circuit, therefore can equally reach saving interface quantity, be beneficial to
The miniaturization of equipment, improve suitability and avoid the technique effect that is directly compatible with causing voltage mismatch problem.
The foregoing is only a specific embodiment of the invention, under the above-mentioned teaching of the present invention, those skilled in the art
Other improvement or deformation can be carried out on the basis of above-described embodiment.It will be understood by those skilled in the art that above-mentioned tool
The purpose of the present invention is simply preferably explained in body description, and protection scope of the present invention should be defined by scope of the claims.
Claims (10)
1. a kind of interface circuit, it is characterised in that the interface circuit includes：USB Type-C interfaces, signal shift switch, USB
Signal end, HDMI signal ends and Displayport signal ends, the USB Type-C interfaces, usb signal end, HDMI signal ends
It is connected respectively with the signal shift switch with Displayport signal ends；
The USB Type-C interfaces, for connecting equipment to be connected；
The signal shift switch, for after the USB Type-C interfaces connect the equipment to be connected, being treated described in detection
The equipment signal type to be transmitted is connected, according to testing result, by the usb signal end, HDMI signal ends and Displayport
One in signal end and the USB Type-C orifices, usb signal, HDMI are realized by the USB Type-C interfaces
The compatible transmission of signal or Displayport signals.
2. interface circuit as claimed in claim 1, it is characterised in that
The signal shift switch is provided with voltage check device, and the voltage check device is connected to the USB Type-C interfaces
SBU1 pins and SBU2 pins；
The SBU1 pins and SBU2 pins of the USB Type-C interfaces are respectively used to the connection equipment HDMI to be connected
SDA pins and SCL pins, or, the AUX_P for being respectively used to connect the Displayport interfaces of the equipment to be connected draws
Pin and AUX_N pins, or, it is hanging when connecting the USB interface of the equipment to be connected；
After the USB Type-C interfaces connect the equipment to be connected, the voltage check device obtains the USB
Magnitude of voltage on the SBU1 pins and SBU2 pins of Type-C interfaces, determines that the equipment to be connected will be passed by the magnitude of voltage
Defeated signal type.
3. interface circuit as claimed in claim 1, it is characterised in that
The interface circuit also includes interface chip, and the interface chip connects the CC1 pins and CC2 of the USB Type-C interfaces
Pin；
The signal shift switch is provided with voltage check device, and the voltage check device is connected to the USB Type-C interfaces
SBU1 pins and SBU2 pins；
The SBU1 pins and SBU2 pins of the USB Type-C interfaces are respectively used to the connection equipment HDMI to be connected
SDA pins and SCL pins, or, the AUX_P for being respectively used to connect the Displayport interfaces of the equipment to be connected draws
Pin and AUX_N pins；
After the USB Type-C interfaces connect the equipment to be connected, the interface chip passes through the CC1 pins and CC2
Pin obtains the configuration information of the equipment to be connected, detects whether the equipment to be connected will transmit usb signal；If it is not, then
The voltage check device obtains the magnitude of voltage on the SBU1 pins and SBU2 pins of the USB Type-C interfaces, by described
Magnitude of voltage determines that the equipment to be connected signal to be transmitted is HDMI signals or Displayport signals.
4. interface circuit as claimed in claim 2 or claim 3, it is characterised in that the voltage check device is analog-digital converter, institute
State SBU1 pins and SBU2 pins that analog-digital converter is respectively connected to the USB Type-C interfaces.
5. interface circuit as claimed in claim 1, it is characterised in that
The signal shift switch detects the equipment to be connected when transmitting usb signal, by the TX2 at the usb signal end
Tetra- passages of +/TX2-, RX2+/RX2-, RX1+/RX1- and TX1+/TX1- respectively with the RX2+ of the USB Type-C interfaces/
Tetra- passage correspondences of RX2-, TX2+/TX2-, TX1+/TX1- and RX1+/RX1- are connected；
The signal shift switch detects the equipment to be connected when transmitting HDMI signals, by the HDMI signal ends
The RX2 of tetra- passages of TX1+/TX1-, TX0+/TX0-, CLK+/CLK- and TX2+/TX2- respectively with the USB Type-C interfaces
Tetra- passage correspondences of +/RX2-, TX2+/TX2-, TX1+/TX1- and RX1+/RX1- are connected；
The signal shift switch detects the equipment to be connected when transmitting Displayport signals, will be described
Tetra- passages of ML0+/ML0-, ML1+/ML1-, ML2+/ML2- and ML3+/ML3- of Displayport signal ends respectively with it is described
Tetra- passage correspondences of RX2+/RX2-, TX2+/TX2-, TX1+/TX1- of USB Type-C interfaces and RX1+/RX1- are connected.
6. a kind of signal transmission apparatus, it is characterised in that set on the signal transmission apparatus just like any one of claim 1-5
Described interface circuit, the signal transmission apparatus is connected by the interface circuit with equipment to be connected, realize usb signal,
The compatible transmission of HDMI signals or Displayport signals.
7. a kind of method of signal transmission, it is characterised in that this method includes：
USB Type-C interfaces, usb signal end, HDMI signal ends and Displayport signal ends are set；
Equipment to be connected is connected by the USB Type-C interfaces；
After connection, detect the equipment to be connected signal type to be transmitted, according to testing result, by the usb signal end,
One in HDMI signal ends and Displayport signal ends and the USB Type-C orifices, pass through the USB
Type-C interfaces and the equipment transmission usb signal to be connected, HDMI signals or Displayport signals.
8. method as claimed in claim 7, it is characterised in that the detection equipment to be connected class signal to be transmitted
Type, is specifically included：
The SBU1 pins and SBU2 pins of the USB Type-C interfaces are connected into the HDMI of the equipment to be connected respectively
SDA pins and SCL pins, or, connect respectively the equipment to be connected Displayport interfaces AUX_P pins and
AUX_N pins, or, it is hanging when connecting the USB interface of the equipment to be connected；
The magnitude of voltage on the SBU1 pins and SBU2 pins of the USB Type-C interfaces is obtained, institute is determined by the magnitude of voltage
State the equipment to be connected signal type to be transmitted.
9. method as claimed in claim 7, it is characterised in that the detection equipment to be connected class signal to be transmitted
Type, is specifically included：
The SBU1 pins and SBU2 pins of the USB Type-C interfaces are connected into the HDMI of the equipment to be connected respectively
SDA pins and SCL pins, or, connect respectively the equipment to be connected Displayport interfaces AUX_P pins and
AUX_N pins；
The configuration information of the equipment to be connected is obtained from the CC1 pins and CC2 pins of the USB Type-C interfaces, institute is detected
State whether equipment to be connected will transmit usb signal；If it is not, then further obtain the USB Type-C interfaces SBU1 pins and
Magnitude of voltage on SBU2 pins, by the magnitude of voltage determine the equipment to be connected signal to be transmitted be HDMI signals or
Displayport signals.
10. method as claimed in claim 7, it is characterised in that described according to testing result, by usb signal end, HDMI signals
One in end and Displayport signal ends and the USB Type-C orifices, are specifically included：
When detecting the equipment to be connected and transmitting usb signal, by the TX2+/TX2- at the usb signal end, RX2+/RX2-,
RX2+/RX2-, TX2+/TX2-, the TX1 of tetra- passages of RX1+/RX1- and TX1+/TX1- respectively with the USB Type-C interfaces
Tetra- passage correspondences of +/TX1- and RX1+/RX1- are connected；
When detecting the equipment to be connected and transmitting HDMI signals, by TX1+/TX1-, TX0+ of the HDMI signal ends/
Tetra- passages of TX0-, CLK+/CLK- and TX2+/TX2- respectively with RX2+/RX2-, TX2+ of the USB Type-C interfaces/
Tetra- passage correspondences of TX2-, TX1+/TX1- and RX1+/RX1- are connected；
When detecting the equipment to be connected and transmitting Displayport signals, by the ML0 of the Displayport signal ends
Tetra- passages of +/ML0-, ML1+/ML1-, ML2+/ML2- and ML3+/ML3- respectively with the RX2+ of the USB Type-C interfaces/
Tetra- passage correspondences of RX2-, TX2+/TX2-, TX1+/TX1- and RX1+/RX1- are connected.
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| CN107678985A (en) * | 2017-09-06 | 2018-02-09 | 苏州佳世达光电有限公司 | Display device and signal carry out source switch method |
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| CN112838635A (en) * | 2021-01-06 | 2021-05-25 | 闻泰通讯股份有限公司 | Interface circuit and intelligent device |
| CN113590519A (en) * | 2021-08-09 | 2021-11-02 | 深圳驰越科技有限公司 | Switching device and method of data transmission channel based on Type-C interface |
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