CN106331946A - Switching circuit for earphone interface and terminal - Google Patents
Switching circuit for earphone interface and terminal Download PDFInfo
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- CN106331946A CN106331946A CN201510372723.9A CN201510372723A CN106331946A CN 106331946 A CN106331946 A CN 106331946A CN 201510372723 A CN201510372723 A CN 201510372723A CN 106331946 A CN106331946 A CN 106331946A
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Abstract
The invention provides a switching circuit for an earphone interface and a terminal. The switching circuit is arranged between the earphone interface and a mainboard and comprises a judging module and a switching module. The judging module is used for judging a working mode of the earphone interface. The working mode of the earphone interface comprises an audio input output mode and a debugging mode. When the working mode of earphone interface is the audio input output mode, an audio control signal is sent to the switching module. When the working mode of the earphone interface is the debugging mode, a debugging control signal is sent to the switching module. The switching module is used for connecting an audio channel between the earphone interface and the mainboard based on the audio control signal sent by the judging module, or connecting a debugging channel between the earphone interface and the mainboard based on the debugging control signal sent by the judging module. The earphone interface can be switched between the audio input output mode and the debugging mode conveniently.
Description
Technical Field
The present invention relates to the field of terminal technologies, and in particular, to a switching circuit for an earphone interface and a terminal.
Background
At present, the design schemes of the debugging interface of the mobile phone mainly include two types: one is to share the USB interface with the debug interface, and the other is to share the headphone interface with the debug interface. However, in the scheme shared with the USB interface, a switching circuit needs to be added to the USB line, thereby causing deterioration in signal quality of the USB interface. The common scheme of the earphone interface and the debugging interface has the following defects: when the earphone interface is adopted for software debugging, an external jig is required to provide a handshaking signal, so that the circuit design becomes complicated. Therefore, a switching circuit and a terminal for an earphone interface are needed to solve the above technical problems in the prior art.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a switching circuit and a terminal for an earphone interface, which are convenient for switching the earphone interface between audio input and output and debugging.
The technical scheme adopted by the invention is as follows:
the utility model provides a switching circuit for earphone interface, wherein, switching circuit is used for setting up between earphone interface and mainboard, includes judgement module and switch module, wherein: the judging module is used for: judging the working mode of the earphone interface, wherein the working mode of the earphone interface comprises audio input and output and debugging; when the working mode of the earphone interface is audio input and output, sending an audio control signal to the switch module; when the working mode of the earphone interface is debugging, sending a debugging control signal to the switch module; the switch module is used for: switching on an audio channel between the earphone interface and the mainboard based on the audio control signal sent by the judging module; or, the debugging control signal sent by the judging module is used for connecting the debugging channel between the earphone interface and the mainboard.
Preferably, the 4 th pin of the headset interface is connected to the headset detecting end of the main board, the 5 th pin of the headset interface is connected to the left channel of the main board, and the determining module determines the working mode of the headset interface according to a change amount of a voltage value on the 4 th pin or the 5 th pin of the headset interface.
Preferably, the determining module determines the working mode of the earphone interface according to the change amount of the voltage value at the 4 th pin or the 5 th pin of the earphone interface by: the 4 th pin and the 5 th pin of the earphone interface are in short circuit by inserting an audio plug into the earphone interface and are grounded, the voltage value of the 4 th pin or the 5 th pin of the earphone interface is changed into 0, and the judgment module judges that the working mode of the earphone interface is audio input and output.
Preferably, the determining module determines the working mode of the earphone interface according to the change amount of the voltage value at the 4 th pin or the 5 th pin of the earphone interface by: the 4 th pin and the 5 th pin of the earphone interface are in short circuit and are not grounded by inserting a test plug into the earphone interface, the voltage value of the 4 th pin or the 5 th pin of the earphone interface is kept unchanged, and the judgment module judges that the working mode of the earphone interface is debugging.
Preferably, the test plug includes a suspended non-grounded end, a debugging receiving section, a grounded end and a debugging output section, which are sequentially arranged, wherein the suspended non-grounded end, the debugging receiving section, the grounded end and the debugging output section are insulated from each other, and the suspended non-grounded end is not grounded.
Preferably, the judging module includes a comparator (U1003A), a diode (D1001), a resistor (R1001, R1002, R1003), a + input terminal of the comparator (U1003A) is connected to one terminal of the resistor (R1003), the other terminal of the resistor (R1003) is connected to the reference voltage, a-input terminal of the comparator (U1003A) is connected to a cathode of the diode (D1001), an anode of the diode (D1001) is connected to the left channel of the motherboard, one terminal of the resistor (R) is connected between the diode (D1001) and the comparator (U1003A), the other terminal of the resistor (R1001) is grounded, one terminal of the resistor (R1002) is connected between the resistor (R1003) and the comparator (U1003A), the other terminal of the resistor (R1002) is grounded, and an output terminal of the comparator (U1003A) is connected to the input terminal of the switch module.
Preferably, the switch module comprises a first analog switch (U1001) and a second analog switch (U1002), wherein: the COM port of the first analog switch (U1001) is connected to the No. 1 pin of the earphone interface, the NO port of the first analog switch (U1001) is connected to the microphone end of the mainboard, and the NC port of the first analog switch (U1001) is connected to the test output end of the mainboard; a COM port of the second analog switch (U1002) is connected to a 3 rd pin of the earphone interface, an NO port of the second analog switch (U1002) is connected to a right channel of the mainboard, and an NC port of the second analog switch (U1002) is connected to a test receiving end of the mainboard; the output terminal of the comparator (U1003A) is connected to the IN port of the first analog switch and the IN port of the second analog switch respectively.
Furthermore, the present invention also provides a terminal, wherein the terminal comprises the switching circuit as described above.
By adopting the technical scheme, the invention at least has the following effects:
the switching circuit for the earphone interface provided by the invention does not need any handshaking signal provided by an external jig, and a simple switching circuit is arranged between the earphone interface and the mainboard, so that the switching of the earphone interface between audio input and output and debugging is simply realized.
Drawings
Fig. 1 is a schematic diagram of a switching circuit mounting position for a headphone jack according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of the switching circuit of FIG. 1;
FIG. 3 is a diagram illustrating a prior art earphone interface as an audio input/output;
FIG. 4 is a schematic diagram of a prior art audio plug;
FIG. 5 is a test plug used in the switching circuit of FIG. 1;
fig. 6 is a schematic circuit diagram of a switching circuit according to a second embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the present invention will be described in detail with reference to the accompanying drawings and preferred embodiments.
The switching circuit for the earphone interface can facilitate software debugging of an operator through the earphone interface without providing auxiliary operation by an external jig. The switching circuit for a headphone interface of the present invention and its respective steps will be described in detail below.
First embodiment
As shown in fig. 1 and fig. 2, the switching circuit 20 for the earphone interface provided in this embodiment may be disposed between the earphone interface 10 and the main board 30, so that the switching circuit may be disposed in the mobile phone terminal, and does not need an external fixture to provide auxiliary operation, and the switching operation is simple and convenient.
As shown, the switching circuit 20 includes a determining module 200 and a switching module 201. Wherein: the determining module 200 is configured to: the operation mode of the headphone interface 10 is determined, and the operation mode of the headphone interface includes audio input and output and debugging. The audio input and output is the audio frequency which is usually used by people to listen to the terminal playing by inserting earphones into the earphone interface 10, and the debugging is to debug the software installed in the terminal through the earphone interface 10. When the headphone interface 10 is used as an audio input output, an audio control signal is sent to the switch module 201. When the headphone interface 10 is used as a debug, a debug control signal is sent to the switch module 201. It can be seen that the determining module 200 is used for determining whether the operator performs audio input/output or debugging next according to the operation of the operator, so as to send a corresponding control signal to the switch module 201.
The switch module 201 is configured to: the audio control signal sent by the judgment module 200 switches on the audio channel between the earphone interface 10 and the main board 30. Alternatively, the debug control signal sent by the determining module 200 is used to turn on the debug channel between the earphone interface 10 and the main board 30. Referring to fig. 3, pin 1 of the earphone interface 10 is connected to the MIC end of the main board 30, pin 5 of the earphone interface 10 is connected to the left channel AUD _ HS _ L of the main board 30, pin 4 of the earphone interface 10 is connected to the earphone detection end HS _ DETECT of the main board 30, and pin 3 of the earphone interface 10 is connected to the right channel AUD _ HS _ R of the main board 30, so that the audio channel between the earphone interface 10 and the main board 30 is connected. And the 1 st pin of the earphone interface is connected to the test output terminal UART _ TX of the main board, and the 3 rd pin of the earphone interface is connected to the test input terminal UART _ RX of the main board 30, so that a debugging channel between the earphone interface 10 and the main board 30 can be realized.
The determination module 200 may send different control signals to the switch module 201 according to any purpose capable of determining the operation of the operator. Preferably, the pin 4 of the headphone interface 10 is connected to the headphone detection end of the main board 30, the pin 5 of the headphone interface 10 is connected to the left channel of the main board 30, and the determining module 200 determines whether the operating mode of the headphone interface 10 is audio input/output or debugging according to the change amount of the voltage value at the pin 4 or the pin 5 of the headphone interface 10. The 4 th pin of the earphone interface 10 is connected to the earphone detecting end of the main board 30, and the 5 th pin of the earphone interface 10 is connected to the left channel of the main board 30, so that 1.8V provided by the main board is provided on the 4 th pin. Accordingly, the voltage on the 5 th pin is also 1.8V, and the voltage on the 4 th pin or the 5 th pin remains unchanged. The voltage value on pin 4 or pin 5 of the headphone interface 10 can thereby be controlled to enable the determination module 200 to enable the transmission of different control signals. Then reference may be made to the following preferred embodiment as to how to control the voltage value on pin 4 or pin 5 of the headphone interface 10.
Specifically, the determining module determines the working mode of the earphone interface according to the change amount of the voltage value at the 4 th pin or the 5 th pin of the earphone interface by: by inserting an audio plug (see fig. 4) into the earphone interface 10, the earphone detection section 4, the grounding section 3, the right channel section 2 and the left channel end 1 extend outwards from the mounting handle 9 in sequence. It should be noted that the left channel end 1 is connected to the ground segment 3, so that the voltages on the left channel segment 1 and the ground segment 3 are always 0. When the audio plug is inserted into the headphone interface 10, the left channel end 1 makes the pin 4 and the pin 5 of the headphone interface 10 short-circuited and grounded, so that the voltage value on the pin 4 or the pin 5 of the headphone interface 10 becomes 0. Therefore, the determination module 200 determines that the voltage value on the 4 th pin or the 5 th pin of the headphone interface 10 changes from 1.8V to 0. The determining module determines that the working mode of the earphone interface 10 is audio input and output according to the change of the voltage value.
Optionally, the determining module determines the working mode of the earphone interface according to the change amount of the voltage value at the 4 th pin or the 5 th pin of the earphone interface by: the 4 th pin and the 5 th pin of the headset interface 10 are short-circuited, not grounded, by inserting a test plug (see fig. 5) into the headset interface 10. The test plug in fig. 5 has a test output terminal 8, a grounding section 3, a test receiving section 6 and a floating non-grounding terminal 5 extending from the mounting handle 7 in sequence. When the test plug is inserted into the earphone interface 10, the floating non-ground terminal 5 can short the voltage value on the 4 th pin or the 5 th pin of the earphone interface 10, but not ground. Since the voltage values on the 4 th pin and the 5 th pin of the headphone interface 10 are 1.8V, the voltage value after the short circuit remains unchanged. Therefore, the determining module 200 determines that the operation mode of the earphone interface 10 is the debug mode by detecting that the voltage value is kept unchanged.
Comparing fig. 4 and 5, fig. 4 is a conventional earphone plug for implementing audio input and output. The test plug may be any plug that can keep the voltage value on pin 4 or pin 5 of the headset interface 10 unchanged after being plugged into the headset interface. Preferably, as shown in fig. 5, the test plug includes a floating non-ground terminal, a debug receiving section, a ground terminal, and a debug output section, which are sequentially disposed, wherein the floating non-ground terminal, the debug receiving section, the ground terminal, and the debug output section are insulated from each other, and the floating non-ground terminal is not grounded.
Second embodiment
As shown in fig. 6, the determining module 200 includes a comparator U1003A, a diode D1001, a resistor R1002, and a comparator R1003, wherein a + input terminal of the comparator U1003A is connected to one terminal of the resistor R1003, the other terminal of the resistor R1003 is connected to a reference voltage, a-input terminal of the comparator U1003A is connected to a cathode of the diode D1001, an anode of the diode D1001 is connected to the left channel of the motherboard, one terminal of the resistor R1001 is connected between the diode D1001 and the comparator U1003A, the other terminal of the resistor R1001 is grounded, one terminal of the resistor R1002 is connected between the resistor R1003 and the comparator U1003A, the other terminal of the resistor R1002 is grounded, and an output terminal of the comparator U1003A is connected to. As can be seen from the figure, the reference voltage is 0.9V obtained by dividing the power supply voltage 1.8V of the comparator by the resistors R1002 and R1003, and the resistances of the resistors R1002 and R1003 may be set to be equal or different. Since the-terminal of the comparator U1003A is connected to the left channel of the main board 30 through a diode, as long as the comparison voltage connected to the-terminal of the comparator U1003A is greater than or less than the reference voltage 0.9V, the comparator U1003A can output different binary signals, so as to send the different binary signals to the switch module 201.
As shown in fig. 6, the switch module 201 includes a first analog switch U1001 and a second analog switch U1002, wherein: the COM port of the first analog switch U1001 is connected to the No. 1 pin of the earphone interface, the NO port of the first analog switch U1001 is connected to the microphone end of the mainboard, and the NC port of the first analog switch U1001 is connected to the test output end of the mainboard; a COM port of the second analog switch U1002 is connected to a 3 rd pin of the earphone interface, an NO port of the second analog switch U1002 is connected to a right channel of the mainboard, and an NC port of the second analog switch U1002 is connected to a test receiving end of the mainboard; the output terminals of the comparator U1003A are connected to the IN port of the first analog switch and the IN port of the second analog switch, respectively.
The first analog switch and the second analog switch can be selected from SGM3157YC6/TR, and the function table of the analog switch is as follows:
| IN port | NO Port | NC port |
| 0 | OFF | ON |
| 1 | ON | OFF |
Therefore, the first analog switch realizes the conduction of the NO port or the NC port according to the difference of the binary signals received by the IN port, so as to realize that the 1 st pin of the earphone interface 10 is connected with the microphone port MIC of the motherboard 30 or the test output terminal UART _ TX. Similarly, the second analog switch turns on the NO port or the NC port according to the binary signal received by the IN port, so that the 3 rd pin of the headphone interface 10 is connected to the right channel AUD _ HS _ R of the main board 30 or the test input terminal UART _ RX. So that the operation mode of the headphone interface 10 can be switched to audio input and output or to software debugging.
In addition, in the embodiment of the present application, a normally open headphone jack is taken as an example, and if a normally closed headphone jack is used, only the determination logic of the comparator U1003A needs to be adjusted, that is, when the comparator U1003A outputs a high level, the headphone interface is used for debugging, and when the comparator U1003A outputs a low level, the headphone interface is used for audio input and output.
Furthermore, the present invention also provides a terminal, wherein the terminal comprises the switching circuit as described above.
As can be seen from the above analysis, the terminal described in the present invention may be a portable terminal such as a mobile phone and a palmtop computer, and may also be a terminal such as a desktop computer that needs to perform software debugging through an earphone interface, which is not particularly limited herein.
While the invention has been described in connection with specific embodiments thereof, it is to be understood that it is intended by the appended drawings and description that the invention may be embodied in other specific forms without departing from the spirit or scope of the invention.
Claims (8)
1. The utility model provides a switching circuit for earphone interface which characterized in that, switching circuit sets up between earphone interface and mainboard, including judging module and switch module, wherein:
the judging module is used for:
judging the working mode of the earphone interface, wherein the working mode of the earphone interface comprises audio input and output and debugging;
when the working mode of the earphone interface is audio input and output, sending an audio control signal to the switch module;
when the working mode of the earphone interface is debugging, sending a debugging control signal to the switch module;
the switch module is used for:
switching on an audio channel between the earphone interface and the mainboard based on the audio control signal sent by the judging module; or,
and connecting a debugging channel between the earphone interface and the mainboard based on the debugging control signal sent by the judging module.
2. The switching circuit according to claim 1, wherein a 4 th pin of the headphone interface is connected to the headphone detection terminal of the main board, a 5 th pin of the headphone interface is connected to the left channel of the main board, and the determining module determines the operating mode of the headphone interface according to a change amount of a voltage value at the 4 th pin or the 5 th pin of the headphone interface.
3. The switching circuit according to claim 2, wherein the determining module determines the operating mode of the headphone interface according to the change amount of the voltage value at the 4 th pin or the 5 th pin of the headphone interface, specifically:
the 4 th pin and the 5 th pin of the earphone interface are in short circuit by inserting an audio plug into the earphone interface and are grounded, the voltage value of the 4 th pin or the 5 th pin of the earphone interface is changed into 0, and the judgment module judges that the working mode of the earphone interface is audio input and output.
4. The switching circuit according to claim 2, wherein the determining module determines the operating mode of the headphone interface according to the change amount of the voltage value at the 4 th pin or the 5 th pin of the headphone interface, specifically:
the 4 th pin and the 5 th pin of the earphone interface are in short circuit and are not grounded by inserting a test plug into the earphone interface, the voltage value of the 4 th pin or the 5 th pin of the earphone interface is kept unchanged, and the judgment module judges that the working mode of the earphone interface is debugging.
5. The switching circuit according to claim 4, wherein the test plug comprises a floating ungrounded terminal, a debug receiving segment, a grounded segment and a debug output segment, which are sequentially arranged, wherein the floating ungrounded terminal, the debug receiving segment, the grounded terminal and the debug output segment are insulated from each other, and the floating ungrounded terminal is not grounded.
6. The switching circuit according to any one of claims 2 to 5, wherein the determining module comprises a comparator (U1003A), a diode (D1001), a resistor (R1001, R1002, R1003), wherein a + input terminal of the comparator (U1003A) is connected to one terminal of the resistor (R1003), the other terminal of the resistor (R1003) is connected to a reference voltage, a-input terminal of the comparator (U A) is connected to a cathode of the diode (D1001), an anode of the diode (D1001) is connected to the left channel of the motherboard, one terminal of the resistor (R1001) is connected between the diode (D1001) and the comparator (U1003A), the other terminal of the resistor (R1001) is grounded, one terminal of the resistor (R1002) is connected between the resistor (R1003) and the comparator (U1003A), the other terminal of the resistor (R1002) is grounded, and an output terminal of the comparator (U361003) is connected to the input terminal of the switching module.
7. The image processing method according to claim 6, wherein the switch module comprises a first analog switch (U1001) and a second analog switch (U1002), wherein:
the COM port of the first analog switch (U1001) is connected to the No. 1 pin of the earphone interface, the NO port of the first analog switch (U1001) is connected to the microphone end of the mainboard, and the NC port of the first analog switch (U1001) is connected to the test output end of the mainboard;
a COM port of the second analog switch (U1002) is connected to a 3 rd pin of the earphone interface, an NO port of the second analog switch (U1002) is connected to a right channel of the mainboard, and an NC port of the second analog switch (U1002) is connected to a test receiving end of the mainboard;
the output terminal of the comparator (U1003A) is connected to the IN port of the first analog switch and the IN port of the second analog switch respectively.
8. A terminal, characterized in that it comprises a switching circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510372723.9A CN106331946A (en) | 2015-06-30 | 2015-06-30 | Switching circuit for earphone interface and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510372723.9A CN106331946A (en) | 2015-06-30 | 2015-06-30 | Switching circuit for earphone interface and terminal |
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| CN106331946A true CN106331946A (en) | 2017-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510372723.9A Pending CN106331946A (en) | 2015-06-30 | 2015-06-30 | Switching circuit for earphone interface and terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109218891A (en) * | 2018-10-16 | 2019-01-15 | 上海畅联智融通讯科技有限公司 | The earphone interface module and mobile terminal of multiplexing serial port function |
| CN118433603A (en) * | 2024-07-04 | 2024-08-02 | 歌尔股份有限公司 | Test circuit and headphone |
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| CN104244160A (en) * | 2013-06-21 | 2014-12-24 | 鸿富锦精密工业（深圳）有限公司 | Electronic device capable of being debugged through earphone port |
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Application publication date: 20170111 |