CN114036007A - Data interface circuit and electronic equipment - Google Patents
Data interface circuit and electronic equipment Download PDFInfo
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- CN114036007A CN114036007A CN202111225010.1A CN202111225010A CN114036007A CN 114036007 A CN114036007 A CN 114036007A CN 202111225010 A CN202111225010 A CN 202111225010A CN 114036007 A CN114036007 A CN 114036007A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/22—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing
- G06F11/2205—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested
- G06F11/221—Detection or location of defective computer hardware by testing during standby operation or during idle time, e.g. start-up testing using arrangements specific to the hardware being tested to test buses, lines or interfaces, e.g. stuck-at or open line faults
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
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Abstract
The application provides a data interface circuit and an electronic device. The interface circuit comprises a data interface and a signal channel switching module. The data interface is used for being electrically connected with external equipment, and the external equipment comprises multimedia equipment and debugging equipment. The signal channel switching module is electrically connected with the data interface, provides a multimedia signal channel and a debugging signal channel, and is used for switching the multimedia signal channel and the debugging signal channel so as to conduct the multimedia signal channel when the multimedia equipment is accessed into the data interface and conduct the debugging signal channel when the debugging equipment is accessed into the data interface; the multimedia signal channel is used for transmitting multimedia data signals, and the debugging signal channel is used for transmitting debugging signals. The interface circuit reuses the data interface as a debugging interface, has simple structure, can be debugged without disassembling the cover by a user, and is convenient to operate.
Description
Technical Field
The present application relates to the field of electronic technologies, and in particular, to a data interface circuit and an electronic device.
Background
In order to not affect the appearance of the existing electronic product, a data interface for transmitting data such as audio and video, for example, an HDMI interface, is mostly arranged outside, but a debugging interface is not arranged. At this time, if debugging is performed, the shell needs to be disassembled, and then the debugging device is connected to the built-in debugging interface for debugging. However, the electronic product has multiple functions, complex internal circuit and troublesome disassembly, which brings great inconvenience to product debugging.
Disclosure of Invention
This application is to the inconvenient problem of the aforesaid debugging to electronic product, provides a data interface circuit and electronic equipment, data interface circuit reuses data interface as the debugging interface, simple structure, data interface circuit includes multimedia signal passageway and debugging signal passageway, can switch on corresponding signal passageway according to the equipment type of inserting automatically for the user can insert debugging equipment data interface debugs, need not tear open the lid, and not only convenient operation can also ensure that multimedia signal transmits normally.
A first aspect of the present application provides a data interface circuit, which includes a data interface and a signal channel switching module. The data interface is used for being electrically connected with external equipment, and the external equipment comprises multimedia equipment and debugging equipment. The signal channel switching module is electrically connected with the data interface, provides a multimedia signal channel and a debugging signal channel, and is used for switching the multimedia signal channel and the debugging signal channel so as to conduct the multimedia signal channel when the multimedia equipment is accessed to the data interface and conduct the debugging signal channel when the debugging equipment is accessed to the data interface. The multimedia signal channel is used for transmitting multimedia data signals, and the debugging signal channel is used for transmitting debugging signals.
A second aspect of the present application provides an electronic device, where the electronic device includes a signal processing circuit and the data interface circuit of the first aspect, the data interface circuit is electrically connected to the signal processing circuit, and the data interface circuit is configured to turn on the multimedia signal channel when the multimedia device is connected to the data interface, and turn on the debug signal channel when the debug device is connected to the data interface; the multimedia signal channel is used as a channel for interacting the multimedia data signals between the multimedia device and the signal processing circuit, and the debugging signal channel is used as a channel for interacting the debugging signals between the debugging device and the signal processing circuit.
The data interface circuit provided by the application reuses the data interface as the debugging interface, has a simple structure, can improve the utilization rate of equipment, and is favorable for equipment miniaturization design. The data interface circuit comprises a multimedia signal channel and a debugging signal channel, and can automatically conduct the corresponding signal channel according to the type of the accessed equipment, so that a user can access the debugging equipment to debug the data interface without detaching a cover or setting an additional debugging interface, the operation is convenient, and the multimedia signal transmission can be ensured to be normal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a data interface circuit according to an embodiment of the present disclosure.
Fig. 2 is a schematic circuit configuration diagram of a data interface of the data interface circuit shown in fig. 1.
Fig. 3 is a schematic circuit diagram of a signal channel switching module of the data interface circuit shown in fig. 1.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Description of the main elements
SCL pin 15
SDA Pin 16
Signal channel switching module 20
Four-channel digital control analog switch U605
First common terminal 201
Second common terminal 202
First connection end 203
Second connection end 204
Third connection end 205
Power supply terminal 207, VCC
First voltage input terminal 221
Second voltage input terminal 222
Device access detection unit 230
Detection signal output terminal 231
First signal input terminal 232
Second signal input terminal 233
Switching element Q1
First unidirectional conductive element D1
Second unidirectional conductive element D2
Resistors R1, R2 and R3
Capacitor C1
Electrostatic protectors D3, D4
Electronic device 1000
The following detailed description will further illustrate the present application in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. The drawings are for illustration purposes only and are merely schematic representations, not intended to limit the present application. It is to be understood that the embodiments described are only a few examples of the present application and not all examples. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.
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 present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for the convenience of description of the present application, and have no specific meaning by themselves. Thus, "module", "component" or "unit" may be used mixedly.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a data interface circuit according to an embodiment of the present disclosure. As shown in fig. 1, the data interface circuit 100 includes a data interface 10 and a signal path switching module 20. In the embodiment of the present application, the data interface 10 is used to electrically connect with external devices, the external devices include the multimedia device 200 and a debugging device (not shown), and the signal path switching module 20 is electrically connected with the data interface 10. For example, if the data interface circuit 100 is applied to an electronic device provided with the signal processing circuit 300, the signal path switching module 20 is configured to be electrically connected to the signal processing circuit 300. In the embodiment of the present application, the data interface 10 includes an HDMI interface, an audio interface (such as a 3.5mm interface and a 2.5mm interface), a USB interface, a Type-C interface, a VGA interface, and the like. Illustratively, when the data interface 10 is an HDMI interface, the multimedia device 200 includes an HDMI device including a computer, VCD, DVD, BD, game console, DV, and the like. The debugging device comprises a Debug device. Among them, HDMI (High Definition Multimedia Interface) is a full digital video and audio transmission Interface, and can transmit uncompressed audio and video signals. The HDMI can be used for set-top boxes, DVD players, personal computers, televisions, game hosts, comprehensive amplifiers, digital stereos and other equipment. HDMI can transmit audio and video signals simultaneously.
In the embodiment of the present application, the signal channel switching module 20 provides a multimedia signal channel and a debug signal channel. The multimedia signal channel is used for transmitting multimedia data signals, and the debugging signal channel is used for transmitting debugging signals. The signal channel switching module 20 is configured to switch the multimedia signal channel and the debug signal channel, so as to turn on the multimedia signal channel and turn off the debug signal channel when the multimedia device is connected to the data interface. In this way, the multimedia device 200 may interact with the signal processing circuit 300 through a multimedia signal channel to implement functions of transmitting audio and video signals, for example, an HDMI data signal. The signal channel switching module 20 is further configured to turn on the debug signal channel and turn off the multimedia signal channel when the debug apparatus accesses the data interface 10. In this way, when the debugging device accesses the data interface 10, the debugging device may interact with the signal processing circuit 300 through the debugging signal channel to debug signals, and the user can perform software debugging on the electronic device provided with the data interface circuit 100.
In the embodiment of the present application, the circuit structure of the data interface 10 may adopt the circuit structure shown in fig. 2, and the circuit structure of the signal path switching module 20 may adopt the circuit structure shown in fig. 3. The circuit structure and the operation principle of the data interface 10 and the signal channel switching module 20 will be described in detail with reference to fig. 2 to 3, taking the data interface circuit 100 as an example of an electronic device provided with the signal processing circuit 300, and taking the data interface 10 as an HDMI interface.
As shown in fig. 2, the data interface 10 includes a first signal pin, a second signal pin, and a power pin 18. In the embodiment of the present application, the first signal pin and the second signal pin correspond to an SDA (serial data line) pin 16 and an SCL (serial clock line) pin 15 of the HDMI interface, respectively. When the multimedia device 200 is connected to the data interface 10, the SCL pin 15 and the SDA pin 16 are used to electrically connect to the SCL connection end and the SDA connection end of the multimedia device 200 in a one-to-one correspondence, and the power pin 18 is used to receive the +5V _ HDMI1 provided by the multimedia device 200. The SCL pin 15 is used to transmit a synchronous clock signal, the SDA pin 16 is used to transmit serial data, and the SCL and the SDA together form an Inter-Integrated Circuit (IIC) bus. In the present embodiment, the data interface 10 includes a conventional HDMI interface, such as an HDMI1.0 interface.
When the debug device accesses the data interface 10, the SCL pin 15 and the SDA pin 16 are used to be electrically connected to a TX (Transmit) connection end and an RX (receive) connection end of the debug device in a one-to-one correspondence.
As shown in fig. 3, the signal path switching module 20 includes an analog switch 210, a voltage providing unit 220, and a device access detecting unit 230.
In the embodiment of the present application, the analog switch 210 includes a first common terminal 201, a second common terminal 202, a first connection terminal 203, a second connection terminal 204, a third connection terminal 205, a fourth connection terminal 206, a power terminal 207, and a control terminal 208. The signal processing circuit 300 (not shown) includes a first signal pin, a second signal terminal, a third signal terminal, and a fourth signal terminal. In the embodiment of the present application, the first signal pin, the second signal terminal, the third signal terminal, and the fourth signal terminal are respectively in one-to-one correspondence with the SDA connection terminal, the SCL connection terminal, the TX connection terminal, and the RX connection terminal. Wherein, SDA link and SCL link are used for transmitting the multimedia data signal, and TX link and RX link are used for transmitting the debugging signal. The multimedia data signal includes IIC signals (HDMI _ SDA, HDMI _ SCL), and the Debug signal includes Debug signals (UART _ TX, UART _ RX). It can be understood that the IIC signal is used for communication between multimedia devices, and has a frequency of about 100kHz and belongs to a low frequency signal, while the baud rate of the Debug signal is about 115400Bd and also belongs to a low frequency signal, so it is appropriate to multiplex the SCL pin 15 and the SDA pin 16 of the data interface 10 as a Debug pin to transmit the Debug signal. The data interface circuit 100 provided by the present application does not change the grounding of the data interface 10, and can ensure that the transmission quality of the multimedia signal is not affected, so that the stability of the multimedia signal is ensured. The UART (Universal Asynchronous Receiver/Transmitter) is a Universal serial data bus for Asynchronous communication. The UART interface is generally used as a debug interface, and includes a TX connection terminal and an RX connection terminal.
Specifically, the first common terminal 201 is electrically connected to the SDA pin 16 of the data interface 10. The second common terminal 202 is electrically connected to the SCL pin 15 of the data interface 10. The first connection terminal 203 is used to electrically connect with the SDA connection terminal of the signal processing circuit 300. The second connection terminal 204 is used for electrically connecting with the SCL connection terminal of the signal processing circuit 300. The third connection terminal 205 is used for electrical connection with the TX connection terminal of the signal processing circuit 300. The fourth connection 206 is used for electrical connection to an RX connection of the signal processing circuit 300. The connection channel between the first common port 201 and the first connection port 203 and the connection channel between the second common port 202 and the second connection port 204 together form a multimedia signal channel. The connection channel between the first common terminal 201 and the third connection terminal 205 and the connection channel between the second common terminal 202 and the fourth connection terminal 206 together constitute a debug signal channel.
The control end 208 is electrically connected to the device access detection unit 230, and the control end 208 is configured to receive a detection signal output by the device access detection unit 230. The analog switch 210 turns on the corresponding signal channel based on the received detection signal. The detection signal output by the device access detection unit 230 includes a first detection signal and a second detection signal.
In other embodiments, the first common terminal 201 and the second common terminal 202 may be integrated as a terminal X, the first connection terminal 203 and the second connection terminal 204 may be integrated as a terminal Y, and the third connection terminal 205 and the fourth connection terminal 206 may be integrated as a terminal Z, depending on the type of interface. Thus, the connection channel between the terminal X and the terminal Y forms a multimedia signal channel, and the connection channel between the terminal X and the terminal Z forms a debugging signal channel. The application does not limit the different connection ends and the common end to be independent ports.
In the present embodiment, the analog switch 210 includes a multi-channel digitally controlled analog switch, for example, a four-channel digitally controlled analog switch U605. As shown in fig. 3, the first common terminal 201, the second common terminal 202, the first connection terminal 203, the second connection terminal 204, the third connection terminal 205, the fourth connection terminal 206, the power supply terminal 207, the control terminal 208 correspond to the 1Y channel common output/input terminal 1-COM, the 2Y channel common output/input terminal 2-COM, the 1Y channel input/output terminal 1Y0, the 2Y channel input/output terminal 2Y0, the 1Y channel input/output terminal 1Y2, the 2Y channel input/output terminal 2Y2, the power supply terminal VCC, and the control terminal B of the four-channel digitally-controlled analog switch U605 one to one. The control terminal a of the four-channel digitally controlled analog switch U605 is also electrically connected to the ground terminal.
In the embodiment of the present application, the voltage providing unit 220 includes a first voltage input terminal 221, a second voltage input terminal 222, and a voltage output terminal 223. The electronic device 1000 further comprises a voltage source (not shown) for providing an operating voltage +3.3V _ Standby to the analog switch 210.
Specifically, the first voltage input 221 is electrically connected to the power pin 18 of the data interface 10, and the first voltage input 221 is configured to receive the voltage +5V _ HDMI1 provided by the multimedia device 200 through the power pin 18. The second voltage input terminal 222 is configured to be electrically connected to a voltage source of the electronic device, and the second voltage input terminal 222 is configured to receive a voltage +3.3V _ Standby provided by the voltage source. The voltage output terminal 223 is electrically connected to the power terminal 207 of the analog switch 210, and the voltage output terminal 223 is used for providing the operating voltage Debug _ VCC to the analog switch 210.
Further, the voltage providing unit 220 further includes a first one-way conduction element D1 and a second one-way conduction element D2. The first unidirectional conducting element D1 is electrically connected between the first voltage input terminal 221 and the voltage output terminal 223, and the first unidirectional conducting element D1 is used for unidirectional conducting the first voltage input terminal 221 to the voltage output terminal 223. The second unidirectional conducting device D2 is electrically connected between the second voltage input terminal 222 and the voltage output terminal 223, and the second unidirectional conducting device D2 is used for unidirectional conducting the second voltage input terminal 222 to the voltage output terminal 223. Illustratively, the first unidirectional conducting element D1 and the second unidirectional conducting element D2 both employ diodes, the anode of the diode D1 is electrically connected to the first voltage input terminal 221, the cathode of the diode D1 is electrically connected to the voltage output terminal 223, the anode of the diode D2 is electrically connected to the second voltage input terminal 222, and the cathode of the diode D2 is electrically connected to the voltage output terminal 223. The voltage supply unit 220 further includes a capacitor C1 for filtering, and the capacitor C1 is electrically connected between the voltage output terminal 223 and the ground terminal.
In the embodiment of the present application, the device access detection unit 230 is electrically connected to the analog switch 210, the data interface 10 and the voltage providing unit 220, respectively, and the device access detection unit 230 is configured to detect whether the multimedia device 200 is accessed to the data interface 10. The device access detection unit 230 is further configured to output a first detection signal to the analog switch 210 when detecting that the multimedia device 200 is accessed, and the analog switch 210 is configured to receive and respond to the first detection signal to turn on a connection channel between the first common port 201 and the first connection port 203 and turn on a connection channel between the second common port 202 and the second connection port 204, thereby turning on a multimedia signal channel. The device access detection unit 230 is further configured to output a second detection signal to the analog switch 210 when it is not detected that the multimedia device 200 is accessed to the data interface, and the analog switch 210 is configured to receive and respond to the second detection signal to turn on a connection channel between the first common terminal 201 and the third connection terminal 205 and turn on a connection channel between the second common terminal 202 and the fourth connection terminal 206, thereby turning on a debug signal channel.
Specifically, the device-access detecting unit 230 includes a detection signal output terminal 231, a first signal input terminal 232, a second signal input terminal 233, a voltage dividing circuit 234, and a switching element Q1. The detection signal output terminal 231 is electrically connected to the control terminal of the analog switch 210. The first signal input 232 is electrically connected to the power pin 18 of the data interface 10. The switching element Q1 is electrically connected between the detection signal output terminal 231 and the ground terminal, and the control terminal of the switching element Q1 is also electrically connected to the first signal input terminal 232. The second signal input terminal 233 is electrically connected to the voltage output terminal 223 of the voltage providing unit 220, and in another embodiment, the second signal input terminal 233 is used for electrically connecting to a voltage source of the electronic device, wherein the voltage source may be the same as or different from the voltage source connected to the second voltage input terminal 222. The second signal input terminal 233 is also electrically connected to the detection signal output terminal 231 through a resistor R3.
The voltage divider circuit 234 is electrically connected between the first signal input terminal 232 and the ground terminal, a voltage dividing node of the voltage divider circuit 234 is electrically connected to a control terminal of the switching element Q1, and the voltage divider circuit 234 is configured to divide the voltage of the first signal input terminal 232 and output a corresponding divided voltage signal. The switching element Q1 is used to turn on or off according to the voltage division signal. Specifically, the voltage divider circuit 234 includes a resistor R1 and a resistor R2 electrically connected in series between the first signal input terminal 232 and the ground terminal, and a connection point between the resistor R1 and the resistor R2 constitutes a voltage dividing node.
In the embodiment of the present application, the switching element Q1 includes an NMOS transistor, a source of the NMOS transistor is connected to the ground, a drain of the NMOS transistor is electrically connected to the detection signal output terminal 231, and a gate of the NMOS transistor corresponds to the control terminal of the switching element Q1.
In operation, when the multimedia device 200 is connected to the data interface 10, the power pin 18 of the data interface 10 receives the voltage +5V _ HDMI1 provided by the multimedia device 200, and the first voltage input terminal 221 of the voltage providing unit 220 transmits the received voltage +5V _ HDMI1 to the analog switch 210 as its operating voltage Debug _ VCC. The first signal input terminal 232 of the device attach detection unit 230 receives the voltage +5V _ HDMI1 provided by the multimedia device 200, turns on the switching element Q1, thereby making the detection signal output terminal 231 at a low level by connecting the turned-on switching element Q1 to the ground, and making the detection signal output terminal 231 output the first detection signal. The first detection signal is a low level signal. The analog switch 210 switches the first connection terminal 203 and the second connection terminal 204 to a conduction mode based on the first detection signal, so as to conduct a connection channel between the first common terminal 201 and the first connection terminal 203, and conduct a connection channel between the second common terminal 202 and the second connection terminal 204, thereby conducting a multimedia signal channel. It can be understood that, in this case, the second unidirectional conducting element D2 can prohibit the voltage output terminal 223 from outputting the voltage to the second voltage input terminal 222 reversely, so as to ensure that the multimedia signal is not pulled down, thereby ensuring that the multimedia signal can be correctly recognized by the multimedia device 200.
When no multimedia device 200 is connected to the data interface 10, the power pin 18 of the data interface 10 does not receive a voltage, and the second voltage input terminal 222 of the voltage providing unit 220 transmits the received voltage +3.3V _ Standby to the analog switch 210 as its operating voltage Debug _ VCC. The first signal input terminal 232 does not receive the voltage, so that the switching element Q1 is turned off, the detection signal output terminal 231 is connected to the second signal input terminal 233 through the resistor R3 to be at a high level, and the detection signal output terminal 231 outputs the second detection signal. Wherein, the second detection signal is a high level signal. The analog switch 210 switches the third connection terminal 205 and the fourth connection terminal 206 to a conduction mode based on the second detection signal, so as to conduct a connection channel between the first common terminal 201 and the third connection terminal 205, and conduct a connection channel between the second common terminal 202 and the fourth connection terminal 206, and further conduct a debugging signal channel. It is understood that accessing the data interface 10 without the multimedia device 200 includes at least two states of accessing the data interface 10 with the commissioning device and accessing the data interface 10 without any external device.
Optionally, the data interface circuit 100 further includes an electrostatic protector D3 and an electrostatic protector D4, and the electrostatic protectors D3 and D4 are used for discharging static electricity to the ground, so as to prevent the static electricity from damaging other components. The electrostatic protector D3 is electrically connected between the first common terminal 201 and the ground terminal, and the electrostatic protector D4 is electrically connected between the second common terminal 202 and the ground terminal.
The data interface circuit 100 provided by the application uses the data interface 10 as a debugging interface, has a simple structure, can improve the utilization rate of equipment, and is beneficial to the miniaturization design of the equipment. The data interface circuit 100 includes a multimedia signal channel and a debug signal channel, and is capable of automatically turning on the corresponding signal channel according to the type of the accessed device. On the one hand, the user can access the data interface with the debugging equipment and debug, does not need to dismantle the lid, also need not to set up extra debugging interface, and not only convenient operation can also ensure that multimedia signal transmission is normal. On the other hand, when the multimedia device 200 is accessed, the data interface circuit 100 can automatically switch on the multimedia signal channel to switch to the multimedia signal communication mode, and manual switching is not required, so that signal identification errors caused by misoperation can be avoided.
Referring to fig. 4, an electronic device 1000 is further provided in the present embodiment, the electronic device 1000 includes a signal processing circuit 300, a voltage source (not shown), and the data interface circuit 100. Illustratively, the electronic device 1000 may be a projector, a set-top box, a DVD player, a personal computer, a television, a game console, an integrated amplifier, a digital stereo, and the like.
The data interface circuit 100 is electrically connected to the signal processing circuit 300, and the data interface circuit 100 is configured to turn on the multimedia signal channel and turn off the debug signal channel when the multimedia device 200 is connected to the data interface 10, and turn on the debug signal channel and turn off the multimedia signal channel when the debug device is connected to the data interface 10. Wherein, the multimedia signal channel is used as a channel for exchanging multimedia data signals between the multimedia device 200 and the signal processing circuit 300, and the debugging signal channel is used as a channel for exchanging debugging signals between the debugging device and the signal processing circuit 300.
A voltage source is electrically connected to data interface circuit 100 for providing an operating voltage, preferably 3.3V, to data interface circuit 100. It is understood that the electronic device 1000 may provide a voltage of 3.3V in a standby condition. In this way, the electronic device 1000 may provide the operating voltage for the data interface circuit 100 in the standby state without adding a standby power supply, so that the debugging device can perform the debugging signal interaction with the signal processing circuit 300 through the debugging signal channel.
The foregoing is an implementation of the embodiments of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the embodiments of the present application, and these modifications and decorations are also regarded as the protection scope of the present application.
Claims (10)
1. A data interface circuit, comprising:
the data interface is used for being electrically connected with external equipment, and the external equipment comprises multimedia equipment and debugging equipment;
the signal channel switching module is electrically connected with the data interface, provides a multimedia signal channel and a debugging signal channel, and is used for switching the multimedia signal channel and the debugging signal channel so as to conduct the multimedia signal channel when the multimedia equipment is accessed into the data interface and conduct the debugging signal channel when the debugging equipment is accessed into the data interface; the multimedia signal channel is used for transmitting multimedia data signals, and the debugging signal channel is used for transmitting debugging signals.
2. The data interface circuit of claim 1, wherein the data interface circuit is used in an electronic device having a signal processing circuit, the signal processing circuit comprising a first signal terminal, a second signal terminal, a third signal terminal, and a fourth signal terminal; the first signal terminal and the second signal terminal are used for transmitting the multimedia data signal, and the third signal terminal and the fourth signal terminal are used for transmitting the debugging signal;
the signal channel switching module includes an analog switch, and the analog switch includes:
the first common end is electrically connected with a first signal pin of the data interface;
the second common end is electrically connected with a second signal pin of the data interface;
the first connection end is used for being electrically connected with the first signal end;
the second connecting end is used for being electrically connected with the second signal end;
the third connecting end is used for being electrically connected with the third signal end; and
the fourth connecting end is used for being electrically connected with the fourth signal end;
the multimedia signal channel is formed by a connection channel between the first public end and the first connection end and a connection channel between the second public end and the second connection end; and a connecting channel between the first common end and the third connecting end and a connecting channel between the second common end and the fourth connecting end jointly form the debugging signal channel.
3. The data interface circuit of claim 2, wherein the data interface includes a power pin for receiving a voltage input by the multimedia device; the electronic equipment further comprises a voltage source, wherein the voltage source is used for providing working voltage for the analog switch;
the signal channel switching module further includes a voltage providing unit, the voltage providing unit including:
the first voltage input end is electrically connected with a power pin of the data interface;
a second voltage input for electrical connection with a voltage source of the electronic device; and
and the voltage output end is electrically connected with a power supply end of the analog switch and is used for providing working voltage for the analog switch.
4. The data interface circuit of claim 3, wherein the voltage providing unit further comprises:
the first unidirectional conducting element is electrically connected between the first voltage input end and the voltage output end and is used for enabling the first voltage input end to be conducted to the voltage output end in a unidirectional mode; and
and the second unidirectional conduction element is electrically connected between the second voltage input end and the voltage output end and is used for unidirectionally conducting the second voltage input end to the voltage output end.
5. The data interface circuit of claim 2, wherein the signal channel switching module further comprises a device access detection unit electrically connected to the analog switch and the data interface, respectively, the device access detection unit being configured to detect whether the multimedia device is accessed to the data interface;
the device access detection unit is further configured to output a first detection signal to the analog switch when detecting that the multimedia device is accessed, where the analog switch is configured to receive and respond to the first detection signal, and to turn on a connection channel between the first common terminal and the first connection terminal, and turn on a connection channel between the second common terminal and the second connection terminal, so as to turn on the multimedia signal channel;
the device access detection unit is further configured to output a second detection signal to the analog switch when the access of the multimedia device is not detected, and the analog switch is configured to receive and respond to the second detection signal, and turn on a connection channel between the first common port and the third connection port, and turn on a connection channel between the second common port and the fourth connection port, thereby turning on the debug signal channel.
6. The data interface circuit of claim 5, wherein the electronic device further comprises a voltage source for providing a voltage to the device attach detection unit; the analog switch further comprises a control end, and the control end is used for receiving the first detection signal or the second detection signal;
the device access detection unit includes:
the detection signal output end is electrically connected with the control end of the analog switch;
the first signal input end is electrically connected with a power pin of the data interface, and the power pin of the data interface is used for receiving voltage provided by the multimedia equipment;
the second signal input end is used for being electrically connected with a voltage source of the electronic equipment and is also electrically connected with the detection signal output end through a resistor; and
the switch element is electrically connected between the detection signal output end and a ground end, and the control end of the switch element is also electrically connected with the first signal input end;
when the multimedia device is connected to the data interface, the first signal input end receives a voltage provided by the multimedia device through a power pin of the data interface, so that the switch element is turned on, the detection signal output end is electrically connected to the ground end through the turned-on switch element and is at a low level, and the detection signal output end outputs the first detection signal;
when the multimedia device is not connected to the data interface, the first signal input end does not receive voltage, the switch element is switched off, the detection signal output end is electrically connected with the second signal input end through the resistor and is in a high level, and the detection signal output end outputs the second detection signal.
7. The data interface circuit of claim 6, wherein the device access detection unit further comprises a voltage divider circuit electrically connected between the first signal input terminal and the ground terminal, a voltage divider node of the voltage divider circuit being electrically connected to the control terminal of the switching element, the voltage divider circuit being configured to divide the voltage at the first signal input terminal and output a corresponding divided voltage signal; the switch element is used for switching on or switching off according to the voltage division signal.
8. A data interface circuit as claimed in any one of claims 2 to 7, wherein said analogue switch comprises a four-channel digitally controlled analogue switch.
9. The data interface circuit as claimed in any one of claims 6 to 7, wherein the switch element comprises an NMOS transistor, a source of the NMOS transistor is electrically connected to the ground terminal, a drain of the NMOS transistor is electrically connected to the detection signal output terminal, and a gate of the NMOS transistor corresponds to the control terminal of the switch element.
10. An electronic device, comprising:
a signal processing circuit; and
the data interface circuit of any one of claims 1-9, the data interface circuit electrically connected to the signal processing circuit, the data interface circuit configured to turn on the multimedia signal channel when the multimedia device is connected to the data interface, and turn on the debug signal channel when the debug device is connected to the data interface; the multimedia signal channel is used as a channel for interacting the multimedia data signals between the multimedia device and the signal processing circuit, and the debugging signal channel is used as a channel for interacting the debugging signals between the debugging device and the signal processing circuit.
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| CN202111225010.1A CN114036007A (en) | 2021-10-20 | 2021-10-20 | Data interface circuit and electronic equipment |
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| CN202111225010.1A CN114036007A (en) | 2021-10-20 | 2021-10-20 | Data interface circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114546919A (en) * | 2022-02-17 | 2022-05-27 | 联想开天科技有限公司 | Electronic equipment and multimedia data transmission method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114546919A (en) * | 2022-02-17 | 2022-05-27 | 联想开天科技有限公司 | Electronic equipment and multimedia data transmission method |
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