CN216312236U - Interface plug identification circuit suitable for three-section type 3.5mm plug and audio device - Google Patents
Interface plug identification circuit suitable for three-section type 3.5mm plug and audio device Download PDFInfo
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- CN216312236U CN216312236U CN202122694735.7U CN202122694735U CN216312236U CN 216312236 U CN216312236 U CN 216312236U CN 202122694735 U CN202122694735 U CN 202122694735U CN 216312236 U CN216312236 U CN 216312236U
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Abstract
The utility model discloses an interface plug identification circuit and an audio device suitable for a three-section 3.5mm plug, which comprise a four-section 3.5mm interface, a triode, a first power supply unit, a voltage pull-up device, a collector resistor and a processor, wherein when the four-section 3.5mm interface is connected with an earphone, the triode is in a cut-off state, the first power supply unit is used for outputting a first voltage, the collector resistor is used for pulling up the output of the triode to the first voltage to form a high-level signal, and the high-level signal is output to the processor. Therefore, when the four-section type 3.5mm interface is connected with the three-section type 3.5mm plug, the four-section type 3.5mm interface transmits a low level signal to cause the triode to be in a cut-off state, then the first voltage output by the first power supply unit forms a high level signal through the pull-up of the collector resistor, the high level signal is received by the final processor, the three-section type 3.5mm plug connection can be rapidly and accurately identified, and the three-section type 3.5mm plug connector can be suitable for the three-section type 3.5mm earphone, the microphone and the plug of an external player.
Description
Technical Field
The utility model relates to the technical field of earphone control, in particular to an interface plug identification circuit suitable for a three-section type 3.5mm plug and an audio pickup device.
Background
At present, 3.5mm interfaces are mostly applied to electronic equipment so as to be connected with various earphones to realize audio signal transmission. Most of 3.5mm interfaces can be divided into syllogic 3.5mm according to the type, the syllogic 3.5mm interface, current syllogic 3.5mm interface often can only discern that the syllogic 3.5mm earphone inserts, and can't be fast, the syllogic 3.5mm earphone of accurate recognition inserts, there is the poor problem of commonality (especially at present preparation discernment circuit in-process, when lacking the syllogic 3.5mm interface, can't adopt the syllogic 3.5mm interface to prepare), influence user experience.
Therefore, the prior art is to be improved.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide an interface plug-in identification circuit and an audio device suitable for a three-section type 3.5mm plug, so as to solve the technical problem that the existing four-section type 3.5mm interface in the background technology cannot quickly and accurately identify the three-section type 3.5mm plug.
The utility model provides an interface plug identification circuit suitable for a three-section 3.5mm plug, which comprises a four-section 3.5mm interface, a triode, a first power supply unit, a voltage pull-up device, a collector resistor and a processor, wherein the voltage pull-up device is simultaneously and electrically connected with the four-section 3.5mm interface and the first power supply unit, the collector resistor is simultaneously and electrically connected with the first power supply unit, the triode and the processor, and the triode is electrically connected between the four-section 3.5mm interface and the processor;
when the four-section type 3.5mm interface and the three-section type 3.5mm plug are in a connection state, the triode is in a cut-off state, the first power supply unit is used for outputting a first voltage, the collector resistor is used for pulling up the output of the triode to the first voltage to form a high-level signal, and the high-level signal is output to the processor;
when the four-section type 3.5mm interface and the three-section type 3.5mm plug are in an unconnected state, the first power supply unit is used for outputting first voltage, the voltage pull-up device is used for providing bias current for the base electrode of the triode, the triode is used for entering a conduction state according to the bias current, and the collector electrode of the triode outputs a low level signal and transmits the generated low level signal to the processor.
On the basis of the first aspect, the circuit further comprises a power supply, the first power supply unit comprises a sub voltage stabilizing unit, the input end of the sub voltage stabilizing unit is electrically connected with the power supply, and the output end of the sub voltage stabilizing unit is simultaneously electrically connected with the collector resistor and the voltage pull-up device;
the sub-voltage stabilizing unit is used for converting the power supply voltage provided by the power supply into the first voltage.
On the basis of the first aspect, the circuit further comprises a second power supply unit, wherein an input end of the second power supply unit is electrically connected with the power supply, and an output end of the second power supply unit is electrically connected with the four-section type 3.5mm interface;
the second power supply unit is used for converting the power supply voltage provided by the power supply into a second voltage and transmitting the second voltage to the four-section type 3.5mm interface.
On the basis of the first aspect, the voltage pull-up device includes a pull-up resistor;
one end of the pull-up resistor is simultaneously electrically connected with the first power supply unit and the collector resistor, and the other end of the pull-up resistor is simultaneously electrically connected with the triode and the four-section type 3.5mm interface.
On the basis of the first aspect, the collector resistance includes a second resistance;
one end of the second resistor is electrically connected with the first power supply unit and one end of the pull-up resistor, and the other end of the second resistor is electrically connected with the processor and the triode.
On the basis of the first aspect, the transistor comprises an NPN-type transistor;
and the base electrode of the NPN type triode is simultaneously and electrically connected with the other end of the pull-up resistor and the four-section type 3.5mm interface, the collector electrode of the NPN type triode is simultaneously and electrically connected with the other end of the second resistor and the processor, and the emitting electrode of the NPN type triode is grounded.
On the basis of the first aspect, the four-section 3.5mm interface is provided with a first pin, a second pin, a third pin and a fourth pin;
and a first pin of the four-section type 3.5mm interface is simultaneously electrically connected with the other end of the pull-up resistor and the base electrode of the NPN type triode, a second pin of the four-section type 3.5mm interface is grounded, and a third pin and a fourth pin of the four-section type 3.5mm interface are electrically connected with a second power supply unit.
On the basis of the first aspect, the circuit further comprises a first filtering module;
the first filtering module is electrically connected among the second power supply unit, the fourth pin of the four-section type 3.5mm interface, the third pin of the four-section type 3.5mm interface and the audio signal input end of the earphone.
On the basis of the first aspect, the circuit further includes a bias resistor;
one end of the bias resistor is electrically connected with the first filtering module, and the other end of the bias resistor is simultaneously electrically connected with the fourth pin of the four-section type 3.5mm interface, the third pin of the four-section type 3.5mm interface and the audio signal input end of the earphone.
In a second aspect of the utility model, there is provided an audio device comprising a circuit as in the first aspect.
The interface plug identification circuit and the audio device suitable for the three-section type 3.5mm plug have the advantages that: the voltage pull-up device is simultaneously electrically connected with the four-section type 3.5mm interface and the first power supply unit, the collector resistor is simultaneously electrically connected with the first power supply unit, the triode and the processor, and the triode is electrically connected between the four-section type 3.5mm interface and the processor. When the 3.5mm plug of syllogic 3.5mm interface connection syllogic, the transmission low level signal of syllogic 3.5mm interface leads to the triode to be in the off-state, then collector resistance is pull-up the first voltage to the triode output, form high level signal, and with high level signal output to treater, high level signal is received to final treater, improve the commonality when reaching the purpose of discernment syllogic 3.5mm plug connection, and can be suitable for the 3.5mm earphone of syllogic, the microphone, outside player plug.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of the terminals of a conventional three-section 3.5mm plug;
fig. 2 is a schematic diagram of a module connection of an interface plug identification circuit suitable for a three-section 3.5mm plug according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a module connection of an interface plug identification circuit suitable for a three-section 3.5mm plug according to a second embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of an interface plug identification circuit suitable for a three-section 3.5mm plug according to a third embodiment of the present invention;
FIG. 5 is a schematic diagram of the electrical connections of the processor of the present invention;
FIG. 6 is a schematic circuit diagram of a first power supply unit according to the present invention;
FIG. 7 is a schematic circuit diagram of a second power supply unit according to the present invention;
FIG. 8 is a schematic diagram of the circuit connection of the power reset circuit of the present invention;
fig. 9 is a schematic diagram of a conventional three-section 3.5mm plug inserted into a four-section 3.5mm jack of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
It is noted that relative terms such as "first," "second," and the like may be used to describe various components, but these terms are not intended to limit the components. These terms are only used to distinguish one component from another component. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present invention.
The interface plug identification circuit suitable for the three-section type 3.5mm plug can be applied to audio devices, such as mobile phones, computers, video desktop microphone arrays and other equipment with an audio playing function. The interface plug identification circuit suitable for the three-section type 3.5mm plug is an improved design circuit based on a four-section type 3.5mm interface, and can be suitable for the three-section type 3.5mm plug (as shown in fig. 1 and 9, the three-section type 3.5mm plug can be an earphone plug, a microphone plug and an external player plug, and the definition of 3 sections of terminals of the plug from the top end to the root part is Mic, Mic and GND, after the four-section type 3.5mm interface is inserted, 1 pin and 2 pins of the four-section type 3.5mm interface are actually connected to the GND terminal of the three-section type 3.5mm plug 666).
Fig. 2 shows an interface plug identification circuit suitable for a three-section 3.5mm plug according to a first embodiment of the present invention, which includes a four-section 3.5mm interface 10, a transistor 50, a first power supply unit 30, a voltage pull-up device 20, a collector resistor 40 and a processor 60, wherein the voltage pull-up device 20 is electrically connected to the four-section 3.5mm interface 10 and the first power supply unit 30 at the same time, the collector resistor 40 is electrically connected to the first power supply unit 30, the transistor 50 and the processor 60 at the same time, and the transistor 50 is electrically connected between the 3.5mm interface 10 and the processor 60; a four-segment 3.5mm interface represents a standard interface with a diameter of 3.5 mm.
Wherein, when four-section 3.5mm interface 10 and syllogic 3.5mm plug are in connected state (four-section 3.5mm interface 10 touches the GND terminal in the terminal of syllogic 3.5mm plug, then four-section 3.5mm interface 10 outputs low level signal), the triode is in the off state this moment, first power supply unit 30 is used for exporting first voltage, collecting electrode resistance is used for pulling up the triode output to first voltage, form high level signal, and export high level signal to the treater, the IO pin of treater can be according to high level signal discernment and has been inserted the earphone from this.
When four-section 3.5mm interface 10 is in the unconnected state with three-section 3.5mm plug (four-section 3.5mm interface 10 does not contact the GND terminal of three-section 3.5mm plug), first power supply unit is used for exporting first voltage, and the voltage is pulled up the device and is used for providing bias current for the triode base, and the triode is used for getting into conducting state according to bias current, the collecting electrode output low level signal of triode to transmit the produced low level signal of triode collecting electrode to the treater.
Therefore, when the four-section type 3.5mm interface is applied to the four-section type 3.5mm interface, the method can be suitable for connection identification of the three-section type 3.5mm plug, quickly and accurately identify corresponding operation of inserting or pulling out the three-section type 3.5mm plug, and has high universality (the identification of the four-section type 3.5mm interface applied to the three-section type 3.5mm plug is novel).
Fig. 3 shows an interface plug identification circuit suitable for a three-section 3.5mm plug according to a second embodiment of the present invention, which further includes a power supply 80, and the power supply transmitted by the power supply 80 is converted into a first voltage by the first power supply unit 30. Specifically, the first power supply unit 30 includes a sub-regulator unit providing a voltage regulation function, an input terminal of the sub-regulator unit is electrically connected to the power supply 80, and an output terminal of the sub-regulator unit is electrically connected to the collector resistor and the voltage pull-up device. When the power supply 80 outputs the power supply (5V), the sub-regulator unit is configured to convert the power supply voltage provided by the power supply 80 into the first voltage (3.3V). Wherein the power supply may be a 5V battery.
Specifically, the circuit further includes a second power supply unit 70, an input end of the second power supply unit 70 is electrically connected to the power supply 80, and an output end of the second power supply unit 70 is electrically connected to the four-segment 3.5mm interface 10. When the power supply 80 outputs the power supply (5V), the second power supply unit 70 is configured to perform analog conversion on the power supply voltage (5V) provided by the power supply into a second voltage, and transmit the second voltage to the four-segment 3.5mm interface 10. Therefore, the single power supply 80 is used for transmitting the power supply voltage to the first power supply unit 30 and the second power supply unit 70 respectively, and the design of the whole power supply circuit is simplified.
Fig. 4 shows an interface plug identification circuit adapted to a three-section 3.5mm plug according to a third embodiment of the present invention, where the voltage pull-up device includes a pull-up resistor R1, one end of the pull-up resistor R1 is electrically connected to the first power supply unit 30 and the collector resistor 40, and the other end of the pull-up resistor R1 is electrically connected to the transistor 50 and the 3.5mm interface 10. Specifically, the resistor R1 is connected between the first power supply voltage (3.3V) and the base (the conducting voltage is about 0.7V) of the triode, the base current is about (3.3V-0.7V)/R1, and the base current makes the triode conduct.
In the present embodiment, the collector resistor 40 includes a second resistor R2, one end of the second resistor R2 is electrically connected to the first power supply unit 30 and one end of the pull-up resistor R1, and the other end of the second resistor R2 is electrically connected to the processor 60 and the transistor 50. Specifically, when the 3.5mm interface 10 is connected to an earphone, the second resistor R2 is used to pull up the transistor output to a first voltage, form a high level signal, and output the high level signal to the processor 60.
In this embodiment, the transistor includes an NPN transistor Q1, a base of the NPN transistor Q1 is electrically connected to the other end of the pull-up resistor R1 and the four-segment 3.5mm interface 10, a collector of the NPN transistor Q1 is electrically connected to the other end of the second resistor R2 and the processor 60, and an emitter of the NPN transistor Q1 is grounded. Specifically, when the four-segment 3.5mm interface 10 is connected to an earphone, the NPN transistor Q1 is in the off state because the base of the NPN transistor Q1 is at the low level. When the four-section 3.5mm interface 10 is not connected to the earphone, the first voltage transmitted by the first power supply unit is pulled up to a high level signal by the pull-up resistor R1, i.e., the base is at a high level, and the NPN transistor Q1 is in a conducting state.
The second pin of the four-section type 3.5mm interface is grounded, and the third pin and the fourth pin of the four-section type 3.5mm interface are electrically connected with the audio signal input terminal MIC _ IN of the earphone and the second power supply unit 70. Therefore, the second voltage provided by the second power supply unit 70 can be transmitted to the third pin and the fourth pin of the four-segment 3.5mm interface to drive the 3.5mm interface to receive the audio signal from the earphone, and when the four-segment 3.5mm interface is connected to the earphone, the first pin of the four-segment 3.5mm interface is connected to the GND terminal of the earphone.
IN this embodiment, the circuit further includes a first filtering module 110, and the first filtering module 110 is electrically connected between the second power supply unit 70, the fourth pin of the four-segment 3.5mm interface J1, the third pin of the four-segment 3.5mm interface J1, and the audio signal input terminal MIC _ IN of the earphone. Specifically, the first filtering module 110 is configured to provide a filtering function, and may perform a filtering process on the second voltage provided by the second power supply unit 70.
The first filtering module 110 includes a filtering resistor R3 and a filtering capacitor C1, one end of the filtering resistor R3 is electrically connected to the second power supply unit 70, the other end of the filtering resistor R3 is electrically connected to one end of the filtering capacitor C1, an audio signal input terminal MIC _ IN of the earphone, a fourth pin of the four-segment 3.5mm interface J1, and a third pin of the four-segment 3.5mm interface J1, and the other end of the filtering capacitor C1 is grounded. The filter resistor R3 and the filter capacitor C1 are matched to provide a filtering function, so that a better filtering effect is provided.
IN this embodiment, the circuit further includes a bias resistor R4, one end of the bias resistor R4 is electrically connected to the first filter module 110, and the other end of the bias resistor R4 is electrically connected to the fourth pin of the four-segment 3.5mm interface J1, the third pin of the four-segment 3.5mm interface, and the audio signal input MIC _ IN of the earphone, so as to provide a dc bias for the four-segment 3.5mm interface J1.
Fig. 5 shows a specific circuit connection diagram of the processor according to the present invention, the processor may be a processing chip U30, and the specific model thereof is STC8F2K16S2_ TSSOP20, and a seventeenth pin P3.6/INT2/RXD _ 2/CMP-of the processing chip U30 serves as an IO pin to receive high-level and low-level signals transmitted from an NPN type triode Q1, so as to accurately determine the connection state of the headset.
Fig. 6 shows a specific circuit connection diagram of the first power supply unit 30 IN the present invention, the sub-regulator unit IN the first power supply unit 30 may be a regulator chip U20, whose model is SY8120, the third pin IN and the fourth pin EN of the regulator chip U20 are electrically connected to the power supply 80 at the same time, the first pin BS of the regulator chip U20 is electrically connected to the third pin FB of the regulator chip U20, the sixth pin LX of the regulator chip U20, one end of the pull-up resistor R1, and one end of the second resistor R2 at the same time, so that the regulator chip U20 can regulate the voltage of the power supply (5V) to be the first voltage of the digital part of 3.3V.
Fig. 7 shows a specific circuit connection diagram of the second power supply unit 70 in the present invention, the second power supply unit 70 includes an analog conversion chip U10, the model of the analog conversion chip U10 is WL2863E33, the first pin VIN of the analog conversion chip U10 is electrically connected to the power supply 80 and the third pin EN of the analog conversion chip U10 at the same time, and the third pin OUT of the analog conversion chip U10 is electrically connected to one end of the filter resistor R3. Specifically, the analog conversion chip U10 may convert the power supply into the second voltage to drive the four-section 3.5mm interface J1.
As shown in fig. 8, the fourth pin MCLKO/RST/P5.4 of the processing chip U30 is electrically connected to a power reset circuit, the power reset circuit includes a reset capacitor C31 and a reset resistor R31, one end of the reset capacitor C31 is electrically connected to the first power supply unit 30, the other end of the reset capacitor C31 is electrically connected to one end of the reset resistor R31 and the fourth pin MCLKO/RST/P5.4 of the processing chip U30, and the other end of the reset capacitor C31 is grounded. The power reset circuit is used as an outer edge circuit of the processing chip U30 to provide a reset function for the processing chip U30.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An interface plug identification circuit suitable for a three-section 3.5mm plug is characterized by comprising a four-section 3.5mm interface, a triode, a first power supply unit, a voltage pull-up device, a collector resistor and a processor, wherein the voltage pull-up device is simultaneously and electrically connected with the four-section 3.5mm interface and the first power supply unit, the collector resistor is simultaneously and electrically connected with the first power supply unit, the triode and the processor, and the triode is electrically connected between the four-section 3.5mm interface and the processor;
when the four-section type 3.5mm interface and the three-section type 3.5mm plug are in a connection state, the triode is in a cut-off state, the first power supply unit is used for outputting a first voltage, the collector resistor is used for pulling up the output of the triode to the first voltage to form a high-level signal, and the high-level signal is output to the processor;
when the four-section type 3.5mm interface and the three-section type 3.5mm plug are in an unconnected state, the first power supply unit is used for outputting first voltage, the voltage pull-up device is used for providing bias current for the base electrode of the triode, the triode is used for entering a conduction state according to the bias current, and the collector electrode of the triode outputs a low level signal and transmits the generated low level signal to the processor.
2. The interface plug identification circuit suitable for the three-section 3.5mm plug according to claim 1, wherein the circuit further comprises a power supply, the first power supply unit comprises a sub-voltage regulation unit, an input end of the sub-voltage regulation unit is electrically connected with the power supply, and an output end of the sub-voltage regulation unit is simultaneously electrically connected with the collector resistance and the voltage pull-up device;
the sub-voltage stabilizing unit is used for converting the power supply voltage provided by the power supply into the first voltage.
3. The interface plug identification circuit suitable for the three-section 3.5mm plug according to claim 2, further comprising a second power supply unit, wherein an input end of the second power supply unit is electrically connected to the power supply, and an output end of the second power supply unit is electrically connected to the four-section 3.5mm interface;
the second power supply unit is used for converting the power supply voltage provided by the power supply into a second voltage and transmitting the second voltage to the four-section type 3.5mm interface.
4. The interface plug identification circuit for a three-section 3.5mm plug according to claim 2, wherein the voltage pull-up device comprises a pull-up resistor;
one end of the pull-up resistor is simultaneously electrically connected with the first power supply unit and the collector resistor, and the other end of the pull-up resistor is simultaneously electrically connected with the base electrode of the triode and the four-section type 3.5mm interface.
5. The interface plug identification circuit for a three-section 3.5mm plug according to claim 4, wherein the collector resistance comprises a second resistance;
one end of the second resistor is electrically connected with the first power supply unit and one end of the pull-up resistor, and the other end of the second resistor is electrically connected with the processor and the triode.
6. The interface plug identification circuit suitable for a three-section 3.5mm plug according to claim 5, wherein the triode comprises an NPN type triode;
and the base electrode of the NPN type triode is simultaneously and electrically connected with the other end of the pull-up resistor and the four-section type 3.5mm interface, the collector electrode of the NPN type triode is simultaneously and electrically connected with the other end of the second resistor and the processor, and the emitting electrode of the NPN type triode is grounded.
7. The interface plug identification circuit for a three-section 3.5mm plug according to claim 6, wherein the four-section 3.5mm interface has a first pin, a second pin, a third pin, and a fourth pin;
the first pin of the four-section type 3.5mm interface is simultaneously electrically connected with the other end of the pull-up resistor and the base electrode of the NPN type triode, the second pin of the four-section type 3.5mm interface is grounded, and the third pin of the four-section type 3.5mm interface is respectively electrically connected with the fourth pin of the four-section type 3.5mm interface, the audio signal input end of the earphone and the second power supply unit.
8. The interface plug identification circuit for a three-section 3.5mm plug according to claim 7, wherein the circuit further comprises a first filtering module;
the first filtering module is electrically connected among the second power supply unit, the fourth pin of the four-section type 3.5mm interface, the third pin of the four-section type 3.5mm interface and the audio signal input end of the earphone.
9. The interface plug identification circuit for a three-section 3.5mm plug according to claim 8, wherein the circuit further comprises a bias resistor;
one end of the bias resistor is electrically connected with the first filtering module, and the other end of the bias resistor is simultaneously electrically connected with a fourth pin of the four-section type 3.5mm interface and a third pin of the four-section type 3.5mm interface.
10. Audio device comprising a circuit according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122694735.7U CN216312236U (en) | 2021-11-04 | 2021-11-04 | Interface plug identification circuit suitable for three-section type 3.5mm plug and audio device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122694735.7U CN216312236U (en) | 2021-11-04 | 2021-11-04 | Interface plug identification circuit suitable for three-section type 3.5mm plug and audio device |
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| CN216312236U true CN216312236U (en) | 2022-04-15 |
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| CN202122694735.7U Active CN216312236U (en) | 2021-11-04 | 2021-11-04 | Interface plug identification circuit suitable for three-section type 3.5mm plug and audio device |
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