CN210895119U - Interface circuit and automobile diagnosis equipment thereof - Google Patents
Interface circuit and automobile diagnosis equipment thereof Download PDFInfo
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- CN210895119U CN210895119U CN201921771495.2U CN201921771495U CN210895119U CN 210895119 U CN210895119 U CN 210895119U CN 201921771495 U CN201921771495 U CN 201921771495U CN 210895119 U CN210895119 U CN 210895119U
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Abstract
The embodiment of the utility model provides a relate to car and software technical field, disclose an interface circuit and automotive diagnosis equipment thereof. In the interface circuit, an output interface of a micro control unit is connected with a first conversion unit and a second conversion unit, the first conversion unit is connected with a USB HOST interface and a USB SLAVE interface, and the second conversion unit is connected with an HDMI interface; the micro control unit is used for controlling the first conversion unit to be set to be in the HOST mode when receiving a trigger signal of the USB HOST interface so as to establish communication with the USB HOST interface; when a trigger signal of the USB SLAVE interface is received, controlling the first conversion unit to be set to a SLAVE mode so as to establish communication with the USB SLAVE interface; and when the trigger signal of the HDMI is received, controlling the second conversion unit to output the TMDS signal so as to establish communication with the HDMI. In this way, the embodiment of the utility model provides a quantity that can effectively prevent to extend the interface reduces along with the reduction of little the control unit output interface quantity.
Description
Technical Field
The embodiment of the utility model provides an embodiment relates to car and software technical field, especially relates to an interface circuit and automotive diagnostic equipment thereof.
Background
In order to improve the finishing quality of maintenance operation, the automobile diagnosis equipment is provided with a plurality of expansion interfaces so as to be connected with a plurality of external equipment through the expansion interfaces for data acquisition and enrich diagnosis data.
However, the inventor finds out in the process of realizing the utility model that: at present, the expansion interface of the automobile diagnosis equipment is directly connected with the output interface of the micro control unit to establish communication with the micro control unit, but along with the improvement of the integration level of the micro control unit, the output interface of the micro control unit is gradually reduced, so that the quantity of the expansion interfaces which can be connected by the micro control unit is reduced, the automobile diagnosis equipment is further made to face the dilemma that the quantity of the expansion interfaces is not enough, and the diagnosis requirement of the automobile diagnosis equipment is difficult to meet.
Therefore, how to ensure the number of the expanded interfaces of the automobile diagnostic equipment under the condition that the output interfaces of the micro control unit are reduced is a technical problem to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model aims at providing an interface circuit and automotive diagnostic equipment thereof, this interface circuit can effectively prevent to extend the quantity of interface and reduce along with little the reduction of control unit output interface quantity.
In order to solve the above technical problem, an embodiment of the present invention adopts a technical solution that: there is provided an interface circuit comprising: the USB HOST interface, the USB SLAVE interface, the HDMI interface, the first conversion unit, the second conversion unit and the micro control unit;
the output interface of the micro control unit is respectively connected with the input end of the first conversion unit and the input end of the second conversion unit, the output end of the first conversion unit is respectively connected with the USB HOST interface and the USBSLAVE interface, and the output end of the second conversion unit is connected with the HDMI interface;
the micro control unit is used for controlling the first conversion unit to be set to be in the HOST mode when a trigger signal of the USB HOST interface is received, so that communication is established between the micro control unit and the USB HOST interface;
the micro control unit is further used for controlling the first conversion unit to be set to a SLAVE mode when receiving a trigger signal of the USB SLAVE interface so as to establish communication between the micro control unit and the USB SLAVE interface;
the micro control unit is further used for controlling the second conversion unit to output a TMDS signal when receiving the trigger signal of the HDMI interface so as to establish communication between the micro control unit and the HDMI interface.
Optionally, the output interface of the micro control unit includes a USB3.1 interface, and the USB3.1 interface includes a USB2.0DRD pin and a USB3.1DATA pin;
the micro control unit is connected with the input end of the first conversion unit through the USB2.0DRD pin, when the micro control unit receives a trigger signal of the USB HOST interface, the micro control unit controls the USB2.0DRD pin to work in a HOST mode, and when the micro control unit receives the trigger signal of the USB SLAVE interface, the micro control unit controls the USB2.0DRD pin to work in a SLAVE mode;
the micro control unit is connected with the input end of the second conversion unit through the USB3.1DATA pin, and when the micro control unit receives a trigger signal of the HDMI, the micro control unit controls the USB3.1DATA pin to output a DP signal to the second conversion unit.
Optionally, the first conversion unit comprises: USB SWITCH;
the input end of the USB SWITCH is connected with the USB2.0DRD pin, and the output end of the USB SWITCH is respectively connected with the USB HOST interface and the USB SLAVE interface.
Optionally, the number of USB HOST interfaces is at least 2; then the process of the first step is carried out,
the first conversion unit further includes:
USB HUB, USB HUB's input with USB SWITCH's output is connected, USB HUB's output respectively with 2 at least USB HOST interface connections.
Optionally, the second conversion unit includes: a protocol converter;
the input end of the protocol converter is connected with the USB3.1DATA pin, and the output end of the protocol converter is connected with the HDMI interface.
Optionally, the USB SWITCH includes: the SWITCH starting circuit comprises a SWITCH chip, a power supply circuit, a SWITCH starting circuit and a control circuit;
the power end of the SWITCH chip is connected with the power circuit;
the SWITCH enabling end of the SWITCH chip is connected with the SWITCH enabling circuit through a logical negation;
the control end of the SWITCH chip is connected with one end of the control circuit, and the other end of the control circuit is connected with the USB2.0DRD pin;
the data input anode and the data input cathode of the SWITCH chip are connected with the USB2.0DRD pin;
a first data output positive electrode and a first data output negative electrode of the SWITCH chip are connected with the USB HOST interface;
a second data output positive electrode and a second data output negative electrode of the SWITCH chip are connected with the USB SLAVE interface;
and the grounding end of the SWITCH chip is grounded.
Optionally, the power supply circuit comprises: the circuit comprises a first resistor, a first capacitor and a second capacitor;
a first end of the first resistor is connected with a voltage, and a second end of the first resistor is connected with a first node;
a first end of the first capacitor is connected with the first node, and a second end of the first capacitor is grounded;
a first end of the second capacitor is connected with the first node, and a second end of the second capacitor is grounded;
the first node is connected to a power supply end of the SWITCH chip.
Optionally, the switch enable circuit comprises: a second resistor;
and the first end of the second resistor is not connected with the logic of the SWITCH starting end of the SWITCH chip, and the second end of the second resistor is grounded.
Optionally, the control circuit comprises: the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the third capacitor;
the first end of the third resistor is connected with the OTG _ VBUS, and the second end of the third resistor is connected with the second node;
a first end of the fourth resistor is connected with the second node, and a second end of the fourth resistor is connected with a third node;
a first end of the fifth resistor is connected with the third node, and a second end of the fifth resistor is grounded;
a first end of the sixth resistor is connected with the third node, and a second end of the sixth resistor is connected with the USB2.0DRD pin;
the first end of the third capacitor is connected with the third node, and the second end of the third capacitor is grounded;
and the second node is accessed to the control end of the SWITCH chip.
In order to solve the above technical problem, the embodiment of the present invention adopts another technical solution: an automotive diagnostic device is provided that includes the interface circuit described above.
The embodiment of the utility model provides a beneficial effect is: be different from under the condition of prior art, the embodiment of the utility model provides an interface circuit and automotive diagnostic equipment thereof, in this interface circuit, including USB HOST interface, USB SLAVE interface, the HDMI interface, first conversion unit, second conversion unit and little the control unit, wherein, because first conversion unit includes HOST mode and SLAVE mode, the second conversion unit can output TMDS signal, therefore, little the control unit's output interface can with USB HOST interface and USB SLAVE interface connection through first conversion unit, can with HDMI interface connection through second conversion unit, namely, little the control unit's an output interface and conversion unit connection back, just can with a plurality of expansion interface connections through the conversion unit, on this basis, even little the control unit's output interface quantity reduces, little the control unit still can with a plurality of expansion interface connections, the quantity of having prevented effectively to expand the interface reduces along with little the reduction of control unit output interface quantity.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of an automotive diagnostic apparatus provided in an embodiment of the present invention;
fig. 2 is a connection diagram of an automotive diagnostic apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an interface circuit according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of an interface circuit according to another embodiment of the present invention;
fig. 5 is a circuit diagram of an interface circuit according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of an interface circuit according to still another embodiment of the present invention;
fig. 7 is a schematic structural diagram of an interface circuit according to still another embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The utility model provides an interface circuit, this interface circuit can be applied to among the higher electronic equipment of integration requirement to little the control unit such as automobile diagnosis equipment, car ADAS check out test set, car four-wheel location check out test set, industry video endoscope to make the electronic equipment who uses this interface circuit can still possess abundant expansion interface under the condition that little the control unit's output interface quantity reduces, satisfy the product user demand.
The present invention will be specifically described below by taking an example in which the interface circuit is applied to an automobile diagnostic apparatus.
Please refer to fig. 1 and fig. 2, which are a vehicle diagnostic apparatus according to an embodiment of the present invention, the vehicle diagnostic apparatus includes: the device includes a device body 100 and an interface circuit 200, wherein the interface circuit 200 is disposed in the device body 100, and an interface of the interface circuit 200 is embedded in a sidewall of the device body 100. When the interface of the interface circuit 200 is embedded in the sidewall of the device main body 100, the interface is communicated with the outside, and the vehicle diagnostic device can be connected to the external device through the interface, and at this time, the interface of the interface circuit 200 is also an expansion interface.
Specifically, the apparatus main body 100 is provided with an interaction unit 110, and the interaction unit 110 is used for interacting with a user, including displaying content to the user, receiving a trigger operation of the user, and the like.
The interaction unit 110 may be a touch display screen, or a combination of a display screen and a key. When the interaction unit 110 is a touch display screen, the content can be displayed to the user through the touch display screen, and the triggering operation of the user can also be received through the touch display screen; when the interaction unit 110 is a combination of a display screen and keys, content can be displayed to a user through the display screen, and a trigger operation of the user is received through the keys.
The interaction unit 110 is communicatively connected to the interface circuit 200, and is capable of displaying an interface conversion prompt sent by the interface circuit 200 to a user, and when the interaction unit 110 displays the interface conversion prompt to the user, the interaction unit 110 is capable of receiving a trigger operation of the interface conversion prompt from the user, where the trigger operation includes an interface conversion authorization instruction or an interface conversion prohibition instruction.
After receiving a trigger operation of the user for the interface conversion prompt, the interaction unit 110 can send an interface conversion authorization instruction or an interface conversion prohibition instruction carried by the trigger operation to the interface circuit 200.
It is to be understood that the interactive unit 110 is also capable of displaying the car diagnosis function, the car diagnosis data, and the like to the user.
The interface circuit 200 includes: USB HOST interface 210, USB SLAVE interface 220, HDMI interface 230, first conversion unit 240, second conversion unit 250, and micro control unit 260.
The interface circuit 200 is communicatively connected to the interaction unit 110 through the micro control unit 260, and the micro control unit 260 is configured to send an interface conversion prompt to the interaction unit 110 and receive an interface conversion authorization instruction or an interface conversion prohibition instruction returned according to a trigger operation of a user. Wherein, the micro control unit 110 is communicatively connected with the interaction unit 110 through other interfaces.
In the interface circuit 200, the micro control unit 260 is connected to the input terminal of the first conversion unit 240 and the input terminal of the second conversion unit 250 through an output interface, the output terminal of the first conversion unit 240 is connected to the USB sleep interface 210 and the USB sleep interface 220, the output terminal of the second conversion unit 250 is connected to the HDMI interface 230, and through the first conversion unit 240 and the second conversion unit 250, one output interface of the micro control unit 260 can also be connected to a plurality of expansion interfaces (including the USB HOST interface 210, the USB sleep interface 220, and the HAMI interface 230).
Among other things, USB HOST interface 210 is used to connect USB slave devices including, but not limited to: USB flash disk, keyboard, mouse, portable hard drive etc.. When a USB slave device is plugged into the USB HOST interface 210, the USB HOST interface 210 generates a trigger signal and sends the trigger signal to the MCU 260.
The HDMI interface 230 is a high definition multimedia interface capable of transmitting digitized video and sound, and the HDMI interface 230 is used to connect devices capable of playing video and/or sound, such as: high-definition displays, and the like. When a device capable of playing video and/or sound is plugged into the HAMI interface 230, the HDMI interface 230 generates a trigger signal and sends the trigger signal to the mcu 260.
The first conversion unit 240 includes a HOST mode and a SLAVE mode, and when the first conversion unit 240 is set to the HOST mode, the first conversion unit 240 transmits data to the USB HOST interface 210; when the first conversion unit 240 is set to the SLAVE mode, the first conversion unit 240 transmits data to the USB SLAVE interface 220. Wherein the HOST mode and SLAVE mode of the first conversion unit 240 are set by the micro control unit 260.
The second conversion unit 250 can output TMDS signals, and when the second conversion unit 250 outputs the TMDS signals, the HDMI interface 230 can implement data transmission through the TMDS signals. Wherein, the TMDS signal output of the second conversion unit 250 is controlled by the micro control unit 260.
Based on this, after the micro control unit 260 receives the trigger signal of the USB HOST interface 210, the first conversion unit 240 is controlled to be set to the HOST mode, so that communication can be established between the micro control unit 260 and the USB HOST interface 210; after receiving the trigger signal of the USB SLAVE interface 220, the mcu 260 controls the first switch unit 240 to set to SLAVE mode, so that communication can be established between the mcu 260 and the USB SLAVE interface 220; after receiving the trigger signal of the HDMI interface 230, the micro control unit 260 controls the second conversion unit 250 to output the TMDS signal, so that communication can be established between the micro control unit 260 and the HDMI interface 230. Accordingly, the micro control unit 260 is configured to control the first conversion unit 240 to be set to the HOST mode to establish communication between the micro control unit 260 and the USB HOST interface 210 when receiving the trigger signal of the USB HOST interface 210; upon receiving the trigger signal of the USB SLAVE interface 220, controlling the first conversion unit 240 to be set to SLAVE mode to establish communication between the micro control unit 260 and the USB SLAVE interface 220; when the trigger signal of the HDMI interface 230 is received, the second conversion unit 250 is controlled to output the TMDS signal, so as to establish communication between the micro control unit 260 and the HDMI interface 230, and at this time, whichever of the plurality of expansion interfaces connected by the micro control unit 260 is plugged, the micro control unit can normally operate.
In some embodiments, the output interface of the mcu 260 is a USB3.1 interface. Because the USB3.1 interface can be downward compatible with the USB2.0, and the USB3.1 interface can realize the transmission of high-definition multimedia signals at a speed of 10Gbps, the pin of the USB3.1 interface is divided into a USB2.0DRD pin capable of realizing USB master-slave control and a USB3.1DATA pin capable of realizing the transmission of the high-definition multimedia signals.
Based on this, please refer to fig. 3, since the first conversion unit 240 is connected to the USB HOST interface 210 and the USB HOST interface 220, respectively, and the USB2.0DRD pin can implement USB master-slave control, the micro control unit 260 is connected to the input terminal of the first conversion unit 240 through the USB2.0DRD pin to implement the USB HOST interface function and the USB SALVE interface function according to the USB master-slave control of the USB2.0DRD pin; since the second conversion unit 250 is connected to the HDMI interface 230 and the USB3.1DATA pin enables high definition multimedia signal transmission, the mcu 260 is connected to the input terminal of the second conversion unit 250 through the USB3.1DATA pin to implement the HAMI interface function according to the high definition multimedia signal transmission of the USB3.1DATA pin.
When the mcu 260 receives the trigger signal from the USB HOST interface 210, the mcu 260 controls the USB2.0DRD pin to operate in HOST mode, that is, the pin USB2.0DRD is enabled to implement the function of the HOST device; when the micro control unit 260 receives the trigger signal of the USB SLAVE interface 220, the micro control unit 260 controls the USB2.0DRD pin to operate in the SLAVE mode, that is, the USB2.0DRD pin implements the SLAVE function; when the mcu 260 receives the trigger signal from the HDMI interface 230, the mcu 260 controls the USB3.1DATA pin to output the DP signal to the second converter unit 250.
Further, referring to fig. 4 and 5, in some embodiments, the first converting unit 240 includes: the input end of the USB SWITCH is connected with the USB2.0DRD pin, and the output end of the USB SWITCH is respectively connected with the USBHOST interface 210 and the USB SLAVE interface 220.
Wherein, the USB SWITCH specifically includes: the SWITCH chip 241, the power circuit 242, the SWITCH enable circuit 243 and the control circuit 244, the power circuit 242 is connected to a power terminal VCC of the SWITCH chip 241, the SWITCH enable circuit 243 is connected to a SWITCH enable terminal OE of the SWITCH chip 241 through a logical not, the control circuit 244 is connected to a control terminal S of the SWITCH chip 241, and a ground terminal GND of the SWITCH chip is grounded.
The USB SWITCH is connected with a USB2.0DRD pin through a data input anode D +, a data input cathode D-and a control circuit 244 of the SWITCH chip 241, connected with the USB HOST interface 210 through a first data output anode 1D + and a first data output cathode 1D-of the SWITCH chip 241, and connected with the USB SLAVE interface 220 through a second data output anode 2D + and a second data output cathode 2D-of the SWITCH chip 241.
The power circuit 242 is configured to supply power to the SWITCH chip 241, and the power circuit 242 includes: a first resistor R1, a first capacitor C1 and a second capacitor C2.
A first end of the first resistor R1 is connected with voltage, and a second end of the first resistor R1 is connected with a first node A; a first end of the first capacitor C1 is connected with the first node A, and a second end of the first capacitor C1 is grounded; a first end of the second capacitor C2 is connected with the first node A, and a second end of the second capacitor C2 is grounded; the first node a is connected to a power terminal VCC of the SWITCH chip 241.
In the power supply circuit 242, when a voltage is input, the power supply circuit 242 filters the voltage and outputs the filtered voltage to the power supply terminal VCC.
A SWITCH enable circuit 243 is used to enable the SWITCH chip 241, and the SWITCH enable circuit 243 includes: a second resistor.
A first terminal of the second resistor R2 is connected to the SWITCH enable terminal OE of the SWITCH chip 241 through a logic not, and a second terminal of the second resistor R2 is grounded.
The control circuit 244 is used for controlling the data transmission path of the SWITCH chip 241, and the control circuit 244 includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a third capacitor C3.
A first end of the third resistor R3 is connected to the OTG _ VBUS, and a second end of the third resistor R3 is connected to the second node B; a first terminal of the fourth resistor R4 is connected to the second node B, and a second terminal of the fourth resistor R4 is connected to the third node C; a first end of the fifth resistor R5 is connected with the third node C, and a second end of the fifth resistor R5 is grounded; a first end of the sixth resistor R6 is connected with the third node C, and a second end of the sixth resistor R6 is connected with the USB2.0DRD pin; a first end of the third capacitor C3 is connected to the third node C, and a second end of the third capacitor C3 is grounded; the second node B is connected to the control terminal S of the SWITCH chip 241.
When the input voltage of the control circuit 244 to the control terminal S is low, the SWITCH chip 241 performs data transmission through the first data output positive electrode 1D + and the first data output negative electrode 1D —, and at this time, the USB SWITCH is in the HOST mode; when the input voltage of the control terminal S is high, the SWITCH chip 241 performs data transmission through the second data output positive electrode 2D + and the second data output negative electrode 2D-, and at this time, the USB SWITCH is in SLAVE mode.
Based on this, when the micro control unit 260 receives the trigger signal of the USB HOST interface 210, the micro control unit 260 controls the control circuit 244 to output a low level to the control terminal S of the SWITCH chip 241, and controls the SWITCH chip 241 to perform data transmission through the first data output positive electrode 1D + and the first data output negative electrode 1D —, so that the USB SWITCH is set to the HOST mode; when the micro control unit 260 receives the trigger signal of the USB SLAVE interface 220, the micro control unit 260 controls the control circuit 244 to output a high level to the control terminal S of the SWITCH chip 241, and controls the SWITCH chip 241 to perform data transmission through the second data output positive electrode 2D + and the second data output negative electrode 2D-, so that the USB SLAVE is set to the SLAVE mode.
Further, referring to fig. 6, in some embodiments, the second conversion unit 250 includes: a protocol converter, the input of which is connected to the USB3.1DATA pin, and the output of which is connected to the HDMI interface 230.
Wherein the protocol converter is capable of converting the DP signal into a TMDS signal output.
Further, when the demand for USB slave devices is large, USB HOST interfaces 210 with a number of at least 2 need to be set, and based on this, referring to fig. 7, when the number of USB HOST interfaces 210 is at least 2, the first conversion unit 240 further includes a USB HUB, an input terminal of the USB HUB is connected to an output terminal of the USB SWITCH, and output terminals of the USB HUB are respectively connected to at least 2 USB HOST interfaces, so that data can be transmitted to a plurality of different USB HOST interfaces 210 through the USB HUB.
The embodiment of the utility model provides an among the interface circuit, an output interface of little the control unit is through with first converting unit and second converting unit connection back, rethread first converting unit and second converting unit and expansion interface connection, make a plurality of expansion interfaces also can be connected to an output interface of little the control unit, on this basis, even the quantity of little the control unit output interface reduces, little the control unit still can extend interface connection with a plurality of, the quantity that can effectively prevent to extend the interface reduces along with the reduction of little the control unit output interface quantity.
It should be noted that the preferred embodiments of the present invention are described in the specification and the drawings, but the present invention can be realized in many different forms, and is not limited to the embodiments described in the specification, and these embodiments are not provided as additional limitations to the present invention, and are provided for the purpose of making the understanding of the disclosure of the present invention more thorough and complete. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention; further, modifications and variations will occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the true spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An interface circuit, comprising: the USB HOST interface, the USB SLAVE interface, the HDMI interface, the first conversion unit, the second conversion unit and the micro control unit;
the output interface of the micro control unit is respectively connected with the input end of the first conversion unit and the input end of the second conversion unit, the output end of the first conversion unit is respectively connected with the USB HOST interface and the USBSLAVE interface, and the output end of the second conversion unit is connected with the HDMI interface;
the micro control unit is used for controlling the first conversion unit to be set to be in the HOST mode when a trigger signal of the USB HOST interface is received, so that communication is established between the micro control unit and the USB HOST interface;
the micro control unit is further used for controlling the first conversion unit to be set to a SLAVE mode when receiving a trigger signal of the USB SLAVE interface so as to establish communication between the micro control unit and the USB SLAVE interface;
the micro control unit is further used for controlling the second conversion unit to output a TMDS signal when receiving the trigger signal of the HDMI interface so as to establish communication between the micro control unit and the HDMI interface.
2. The interface circuit of claim 1, wherein the output interface of the micro-control unit comprises a USB3.1 interface, the USB3.1 interface comprising a USB2.0DRD pin and a USB3.1DATA pin;
the micro control unit is connected with the input end of the first conversion unit through the USB2.0DRD pin, when the micro control unit receives a trigger signal of the USB HOST interface, the micro control unit controls the USB2.0DRD pin to work in a HOST mode, and when the micro control unit receives the trigger signal of the USB SLAVE interface, the micro control unit controls the USB2.0DRD pin to work in a SLAVE mode;
the micro control unit is connected with the input end of the second conversion unit through the USB3.1DATA pin, and when the micro control unit receives a trigger signal of the HDMI, the micro control unit controls the USB3.1DATA pin to output a DP signal to the second conversion unit.
3. The interface circuit of claim 2, wherein the first conversion unit comprises: USB SWITCH;
the input end of the USB SWITCH is connected with the USB2.0DRD pin, and the output end of the USB SWITCH is respectively connected with the USB HOST interface and the USB SLAVE interface.
4. The interface circuit of claim 3, wherein the number of USB HOST interfaces is at least 2; then the process of the first step is carried out,
the first conversion unit further includes:
USB HUB, USB HUB's input with USB SWITCH's output is connected, USB HUB's output respectively with 2 at least USB HOST interface connections.
5. Interface circuit according to claim 3 or 4, characterized in that the second conversion unit comprises: a protocol converter;
the input end of the protocol converter is connected with the USB3.1DATA pin, and the output end of the protocol converter is connected with the HDMI interface.
6. The interface circuit of claim 5, wherein the USB SWITCH comprises: the SWITCH starting circuit comprises a SWITCH chip, a power supply circuit, a SWITCH starting circuit and a control circuit;
the power end of the SWITCH chip is connected with the power circuit;
the SWITCH enabling end of the SWITCH chip is connected with the SWITCH enabling circuit through a logical negation;
the control end of the SWITCH chip is connected with one end of the control circuit, and the other end of the control circuit is connected with the USB2.0DRD pin;
the data input anode and the data input cathode of the SWITCH chip are connected with the USB2.0DRD pin;
a first data output positive electrode and a first data output negative electrode of the SWITCH chip are connected with the USB HOST interface;
a second data output positive electrode and a second data output negative electrode of the SWITCH chip are connected with the USB SLAVE interface;
and the grounding end of the SWITCH chip is grounded.
7. The interface circuit of claim 6, wherein the power circuit comprises: the circuit comprises a first resistor, a first capacitor and a second capacitor;
a first end of the first resistor is connected with a voltage, and a second end of the first resistor is connected with a first node;
a first end of the first capacitor is connected with the first node, and a second end of the first capacitor is grounded;
a first end of the second capacitor is connected with the first node, and a second end of the second capacitor is grounded;
the first node is connected to a power supply end of the SWITCH chip.
8. The interface circuit of claim 6, wherein the switch enable circuit comprises: a second resistor;
and the first end of the second resistor is not connected with the logic of the SWITCH starting end of the SWITCH chip, and the second end of the second resistor is grounded.
9. The interface circuit of claim 6, wherein the control circuit comprises: the third resistor, the fourth resistor, the fifth resistor, the sixth resistor and the third capacitor;
the first end of the third resistor is connected with the OTG _ VBUS, and the second end of the third resistor is connected with the second node;
a first end of the fourth resistor is connected with the second node, and a second end of the fourth resistor is connected with a third node;
a first end of the fifth resistor is connected with the third node, and a second end of the fifth resistor is grounded;
a first end of the sixth resistor is connected with the third node, and a second end of the sixth resistor is connected with the USB2.0DRD pin;
the first end of the third capacitor is connected with the third node, and the second end of the third capacitor is grounded;
and the second node is accessed to the control end of the SWITCH chip.
10. An automotive diagnostic device, characterized by comprising an interface circuit according to any one of claims 1 to 9.
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| CN201921771495.2U CN210895119U (en) | 2019-10-18 | 2019-10-18 | Interface circuit and automobile diagnosis equipment thereof |
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| CN201921771495.2U CN210895119U (en) | 2019-10-18 | 2019-10-18 | Interface circuit and automobile diagnosis equipment thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110618672A (en) * | 2019-10-18 | 2019-12-27 | 深圳市道通科技股份有限公司 | Interface circuit and interface communication method and device thereof |
| CN112579500A (en) * | 2020-12-08 | 2021-03-30 | 深圳市道通科技股份有限公司 | Method and device for prompting anti-misplug USB interface and electronic equipment |
-
2019
- 2019-10-18 CN CN201921771495.2U patent/CN210895119U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110618672A (en) * | 2019-10-18 | 2019-12-27 | 深圳市道通科技股份有限公司 | Interface circuit and interface communication method and device thereof |
| US11989150B2 (en) | 2019-10-18 | 2024-05-21 | Autel Intelligent Technology Corp., Ltd. | Interface circuit, and method and apparatus for interface communication thereof |
| CN112579500A (en) * | 2020-12-08 | 2021-03-30 | 深圳市道通科技股份有限公司 | Method and device for prompting anti-misplug USB interface and electronic equipment |
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