CN112954537A - Bluetooth headset input port expanding circuit - Google Patents

Bluetooth headset input port expanding circuit Download PDF

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Publication number
CN112954537A
CN112954537A CN202110359764.XA CN202110359764A CN112954537A CN 112954537 A CN112954537 A CN 112954537A CN 202110359764 A CN202110359764 A CN 202110359764A CN 112954537 A CN112954537 A CN 112954537A
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resistor
function expansion
series
circuit
expansion unit
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CN202110359764.XA
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CN112954537B (en
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沈庆凯
胡平
李鑫
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Guangdong Chaoyang Electronic Technology Co ltd
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Guangdong Chaoyang Electronic Technology Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1041—Mechanical or electronic switches, or control elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
    • H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

The invention relates to an expansion circuit of an input port of a Bluetooth headset, which comprises a pull-up resistor, a temperature detection circuit and a function expansion circuit, wherein the temperature detection circuit is connected with the function expansion circuit and forms a voltage division node connected with a temperature detection pin of a Bluetooth main control chip, the voltage division node is connected with a series circuit, and the function expansion circuit comprises a first function expansion unit to a sixth function expansion unit; the series node of the first resistor and the second resistor is connected with a power supply VCC through the first function extension unit and is grounded through the second function extension unit; a series node of the second resistor and the third resistor is connected with a power supply VCC through the third function extension unit and is grounded through the fourth function extension unit; the non-series nodes of the third resistor are respectively connected with the fifth function expansion unit and the sixth function expansion unit, so that a plurality of input ports can be expanded by the temperature detection pins of the shared Bluetooth main control chip, and the Bluetooth main control chip has the functions of keys, Hall or charging state and the like, and the circuit cost is greatly reduced.

Description

Bluetooth headset input port expanding circuit
Technical Field
The invention relates to the technical field of Bluetooth headset input port expansion circuits, in particular to a Bluetooth headset input port expansion circuit.
Background
With the 3.5 audio interface of the mobile phone being cancelled, the Bluetooth headset is more and more fierce in competition, and the cost of the Bluetooth headset is reduced. Many bluetooth main control chips are reduced to the limit in order to reduce the cost, and the available input/output control interfaces are limited, and are generally within 8 interfaces. When the whole bluetooth headset is designed, in order to gain cost advantages, the cheapest main chip is usually selected, but software upgrading, three-color LEDs, ambient temperature monitoring, three/four first keys, hall magnetic attraction and other functions become standard configurations of the current bluetooth headset, and at least 10 input/output control interfaces are needed for realizing all the functions conventionally. Contrary to the cost reduction, the bluetooth control chip or the port expansion chip with more ports is selected, which means the cost is increased. There is a need for a cost effective circuit to solve the problem of port expansion.
Therefore, in the present patent application, the applicant has elaborated a bluetooth headset input port extension circuit to solve the above problems.
Disclosure of Invention
The invention aims at the defects of the prior art, and mainly aims to provide an input port expansion circuit of a Bluetooth headset, which realizes that a plurality of input ports can be expanded by sharing a temperature detection pin of a Bluetooth main control chip, has the functions of keys, Hall or charging state and the like, and greatly reduces the circuit cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
an expansion circuit of an input port of a Bluetooth headset comprises a pull-up resistor, a temperature detection circuit and a function expansion circuit, wherein the temperature detection circuit and the function expansion circuit are connected and form a voltage division node which is commonly connected with a temperature detection pin of a Bluetooth main control chip;
the temperature detection circuit comprises a thermistor NTC and a filter capacitor C1, the first resistor connecting end is grounded through the thermistor NTC, and the voltage division node is grounded through a filter capacitor C1;
the voltage division node is connected with a series circuit, the series circuit comprises a first resistor, a second resistor and a third resistor which are sequentially connected in series, and the function expansion circuit comprises a first function expansion unit to a sixth function expansion unit;
the series node of the first resistor and the second resistor is connected with the second resistor connecting end through the first function expansion unit, and the series node of the first resistor and the second resistor is grounded through the second function expansion unit;
the series node of the second resistor and the third resistor is connected with a second resistor connecting end through a third function expansion unit, and the series node of the second resistor and the third resistor is grounded through a fourth function expansion unit;
the first function expansion unit to the fourth function expansion unit comprise fourth resistors, the first function expansion unit to the fourth function expansion unit also comprise first keys or first switch tubes connected with the fourth resistors in series, and the first switch tubes are provided with first control ends used for being connected with the first push-pull circuits;
the non-series node of the first resistor is connected with a voltage division node, the non-series node of the third resistor is respectively connected with a fifth function expansion unit and a sixth function expansion unit, the fifth function expansion unit comprises a fifth resistor, the fifth resistor is provided with a third resistor connecting end and a fourth resistor connecting end used for connecting a high potential output end of an open leakage circuit, and the third resistor connecting end is connected with the non-series node of the third resistor;
the sixth function expansion unit comprises a sixth resistor, the sixth resistor is provided with a fifth resistor connecting end and a sixth resistor connecting end used for connecting a low potential output end of the open leakage circuit, and the fifth resistor connecting end is connected with a non-series node of the third resistor.
As a preferable scheme, the series circuit further includes a seventh resistor connected in series with the third resistor, the function expansion circuit further includes a seventh function expansion unit, and a series node of the third resistor and the seventh resistor is connected to the third resistor connection end and the fifth resistor connection end respectively;
the non-series node of the seventh resistor is connected with the second resistor connecting end through a seventh function expansion unit, the seventh function expansion unit comprises an eighth resistor, the seventh function expansion unit further comprises a second key or a second switching tube which is connected with the eighth resistor in series, and the second switching tube is provided with a second control end which is used for being connected with a second push-pull circuit.
As a preferable scheme, the series circuit further includes a seventh resistor connected in series with the third resistor, the function expansion circuit further includes an eighth function expansion unit, and a series node of the third resistor and the seventh resistor is connected to the third resistor connection end and the fifth resistor connection end respectively;
the non-series node of the seventh resistor is grounded through an eighth function expansion unit, the eighth function expansion unit comprises a ninth resistor, the eighth function expansion unit further comprises a third key or a third switch tube connected with the ninth resistor in series, and the third switch tube is provided with a third control end used for being connected with a third push-pull circuit.
Compared with the prior art, the invention has obvious advantages and beneficial effects, particularly: the Bluetooth master control chip mainly comprises a series circuit and a plurality of function expansion units, wherein when a non-temperature detection function is input, the function expansion units and corresponding resistors in the series circuit are connected and then are subjected to voltage division with a pull-up resistor R7 or a thermistor NTC, so that a plurality of input ports can be expanded by sharing temperature detection pins of the Bluetooth master control chip, and the Bluetooth master control chip has the functions of pressing keys, Hall or charging state and the like, and the circuit cost is greatly reduced;
and through increasing the series resistance in the series circuit and increasing a plurality of function extension units connected with the power supply VCC or the ground, the extension of functions is enriched, the extension of 256 functions can be realized to the maximum extent, and the development of enterprises and industries is facilitated.
To more clearly illustrate the structural features and effects of the present invention, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic control block diagram of a first embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a first embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a second embodiment of the present invention;
FIG. 4 is a circuit schematic of a third embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a fourth embodiment of the present invention.
The reference numbers illustrate:
10. output node
20. Series circuit
31. A first function extension unit 32 and a second function extension unit
33. Third function extension unit 34, fourth function extension unit
35. A fifth function extension unit 36 and a sixth function extension unit
37. Seventh function extension unit 38, eighth function extension unit
41. A first push-pull circuit 42 and a second push-pull circuit.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
As shown in fig. 1 to 5, an expansion circuit of an input port of a bluetooth headset includes a pull-up resistor, a temperature detection circuit and a function expansion circuit, where the temperature detection circuit and the function expansion circuit are connected and form a voltage division node commonly connected to a temperature detection pin of a bluetooth main control chip U1, the pull-up resistor R9 has a first resistor connection end and a second resistor connection end for connecting a power VCC, and the second resistor connection end is connected to the voltage division node 10;
the temperature detection circuit comprises a thermistor NTC and a filter capacitor C1, the first resistor connecting end is grounded through the thermistor NTC, and the voltage division node 10 is grounded through a filter capacitor C1; the filter capacitor C1 is used for filtering power supply ripples and noise floor on the temperature detection pin.
The voltage division node 10 is connected with a series circuit 20, the series circuit 20 comprises a first resistor, a second resistor and a third resistor which are sequentially connected in series, and the function expansion circuit comprises a first function expansion unit to a sixth function expansion unit;
the series node of the first resistor and the second resistor is connected with the second resistor connecting end through the first function expansion unit, and the series node of the first resistor and the second resistor is grounded through the second function expansion unit;
the series node of the second resistor and the third resistor is connected with a second resistor connecting end through a third function expansion unit, and the series node of the second resistor and the third resistor is grounded through a fourth function expansion unit;
the first function expansion unit to the fourth function expansion unit comprise fourth resistors, the first function expansion unit to the fourth function expansion unit also comprise first keys or first switch tubes connected with the fourth resistors in series, and the first switch tubes are provided with first control ends used for being connected with the first push-pull circuits;
the non-series node of the first resistor is connected with a voltage division node 10, the non-series node of the third resistor is respectively connected with a fifth function expansion unit and a sixth function expansion unit, the fifth function expansion unit comprises a fifth resistor, the fifth resistor is provided with a third resistor connecting end and a fourth resistor connecting end used for connecting a high-potential output end of an open leakage circuit, and the third resistor connecting end is connected with the non-series node of the third resistor;
the sixth function expansion unit comprises a sixth resistor, the sixth resistor is provided with a fifth resistor connecting end and a sixth resistor connecting end used for connecting a low potential output end of the open leakage circuit, and the fifth resistor connecting end is connected with a non-series node of the third resistor.
In the first embodiment, as shown in the figure, the series circuit includes a first resistor R1, a second resistor R2 and a third resistor R3 which are sequentially connected in series, the first function expansion unit includes a first key S1 in which a fourth resistor R5 and a fourth resistor R5 are connected in series, the second function expansion unit includes a first key S2 in which a fourth resistor R6 and a fourth resistor R6 are connected in series, the third function expansion unit includes a first switch tube Q1 in which a fourth resistor R7 and a fourth resistor R7 are connected in series, and the fourth function expansion unit includes a first switch tube Q2 in which a fourth resistor R8 and a fourth resistor R8 are connected in series.
The series circuit further comprises a seventh resistor connected with the third resistor in series, the function expansion circuit further comprises a seventh function expansion unit, and the series nodes of the third resistor and the seventh resistor are respectively connected with a third resistor connecting end and a fifth resistor connecting end;
the non-series node of the seventh resistor is connected with the second resistor connecting end through a seventh function expansion unit, the seventh function expansion unit comprises an eighth resistor, the seventh function expansion unit further comprises a second key or a second switching tube which is connected with the eighth resistor in series, and the second switching tube is provided with a second control end which is used for being connected with a second push-pull circuit.
In the second embodiment, as shown in the figure, the series circuit further includes a seventh resistor R4 connected in series with the third resistor R3, and the seventh function expansion unit includes an eighth resistor R12 and a second key S3 connected in series with the eighth resistor R12.
The function expansion circuit further comprises an eighth function expansion unit, the non-series node of the seventh resistor is grounded through the eighth function expansion unit, the eighth function expansion unit comprises an eighth resistor, the eighth function expansion unit further comprises a third key or a third switch tube which is connected with the eighth resistor in series, and the third switch tube is provided with a third control end used for being connected with a third push-pull circuit.
In the third embodiment, as shown in the figure, the eighth function expanding unit includes a ninth resistor R13 and a third key S4 connected in series with the ninth resistor R13.
In the fourth embodiment, as shown in the figure, the expansion is performed on the basis of the first embodiment, specifically: the series circuit comprises a first resistor R1, a second resistor R2, a third resistor R3 and a seventh resistor R4 which are sequentially connected in series, and the function expansion circuit comprises a first function expansion unit to an eighth function expansion unit;
the first function expanding unit 31 includes a first button S1 having a fourth resistor R5 connected in series with a fourth resistor R5, wherein the first button S1 is a volume + button for increasing the volume.
The second function expanding unit 32 includes a first button S2 having a fourth resistor R6 connected in series with a fourth resistor R6, wherein the first button S2 is a volume button for reducing volume.
The third function expansion unit 33 includes a first switching tube Q1 in which a fourth resistor R7 is connected in series with a fourth resistor R7, and the fourth function expansion unit 34 includes a first switching tube Q2 in which a fourth resistor R8 is connected in series with a fourth resistor R8. Preferably, the second switch tube and the first switch tube Q1 of the third function extension unit 33 may be PMOS tubes, and of course, may also be PNP transistors (the collector of the PNP transistor is equivalent to the drain, the base is equivalent to the gate, and the emitter is equivalent to the source), which is not limited herein;
the source of the PMOS transistor of the third function extension unit 33 is connected to the power VCC, the gate of the PMOS transistor of the third function extension unit 33 is connected to the first control end of the first push-pull circuit 41, and the drain of the PMOS transistor of the third function extension unit 33 is connected to the series node of the second resistor R2 and the third resistor R3 through the fourth resistor R7.
The third switching tube and the first switching tube Q2 of the fourth function extension unit 34 may be NMOS tubes, or of course, may also be NPN triodes (the collector of the NPN triode corresponds to the drain, the base corresponds to the gate, and the emitter corresponds to the source), which is not limited herein;
the source of the NMOS transistor of the fourth function extension unit 34 is grounded, the gate of the NMOS transistor of the fourth function extension unit 34 is connected to the first control end of the first push-pull circuit 42, and the drain of the NMOS transistor of the fourth function extension unit 34 is connected to the series node of the second resistor R2 and the third resistor R3 through the fourth resistor R8.
The fifth function expanding unit 35 includes a fifth resistor R10, the fifth resistor R10 has a third resistor connection terminal and a fourth resistor connection terminal for connecting a high potential output terminal of the open-drain circuit, and the third resistor connection terminal is connected to the non-series node of the third resistor R3; preferably, the high-potential output end of the open leakage circuit is a high-potential output end PPR of an open leakage circuit inside an overvoltage protection chip in the bluetooth headset.
The sixth function expanding unit 36 includes a sixth resistor R11, the sixth resistor R11 has a fifth resistor connection terminal and a sixth resistor connection terminal for connecting a low potential output terminal of the open circuit, and the fifth resistor connection terminal is connected to the non-series node of the third resistor R3; preferably, the low potential output terminal of the open leakage circuit is a low potential output terminal CHGb of an internal open leakage circuit of an overvoltage protection chip in the bluetooth headset.
The seventh function extension unit 37 comprises an eighth resistor R12 and a second key S3 connected in series with the eighth resistor R12; the second button S3 is a play/pause button, which functions to play music or pause music.
The eighth function expanding unit 38 comprises a ninth resistor R13 and a third key S4 connected in series with the ninth resistor R13; the third button S4 is a favorite button, which is used to favorite the current music.
The first to fourth embodiments are all improvements to the existing battery temperature detection circuit, and the corresponding resistance is mainly added to the AD sampling pin of the original bluetooth main control chip U1 in a serial and parallel manner. Although the resistor and the first switch tube are added, the cost is lower than that of a bluetooth chip or a port expansion chip with more ports. In the first to fourth embodiments, the temperature, the key, the hall, the charging state, and the like, which originally need a plurality of input/output control interfaces, can be realized by only sharing one input/output control interface (temperature detection pin), and if the calculation is performed according to 8-bit a/D, the present embodiment can expand 256 functional inputs at most.
When the function is input, the corresponding resistor and the pull-up resistor R7 or the thermistor NTC divide the voltage, and the temperature detection pin of the Bluetooth main control chip obtains the corresponding voltage, thereby realizing the function input.
Specifically, the following general principles are explained by taking the fourth embodiment as an example:
for such common switches (e.g., the first button S1, the first button S2, the second button S3, and the third button S4) that are only turned on or off, the functions of volume +, volume-, play/pause, and music collection can be realized by directly pulling the corresponding resistors connected in series and in parallel to the ground or the power VCC through the corresponding switches.
For example, when the first button S1 is pressed, the fourth resistor R5 is connected in series with the first resistor R1 and then divides the voltage with the thermistor NTC;
when the first key S2 is pressed, the fourth resistor R6 is connected in series with the first resistor R1 and then is subjected to voltage division with the pull-up resistor R9;
when the second key S3 is pressed, the eighth resistor R12 is connected with the first resistor R1 through the seventh resistor R4, the third resistor R3 and the second resistor R2 in sequence and then is subjected to voltage division with the thermistor NTC;
when the third key S4 is pressed, the eighth resistor R13 is connected with the first resistor R1 through the seventh resistor R4, the third resistor R3 and the second resistor R2 in sequence and then is subjected to voltage division with the pull-up resistor R9;
for the two circuits that the output of the internal circuit of the corresponding function chip in the bluetooth headset is the high potential output of the high resistance or open leakage circuit (such as the high potential output end PPR of the internal circuit of the overvoltage protection chip) and the low potential output of the high resistance or open leakage circuit (such as the low potential output end CHG of the internal circuit of the overvoltage protection chip), the series and parallel resistors can also be directly connected to the outputs.
When high potential output of an open leakage circuit exists, the fifth resistor R10 is connected with the first resistor R1 through the third resistor R3 and the second resistor R2 in sequence and then is subjected to voltage division with the thermistor NTC;
when a low-potential output of the open-drain circuit is available, the sixth resistor R11 is connected with the first resistor R1 through the third resistor R3 and the second resistor R2 in sequence and then is divided by the pull-up resistor R9.
For a push-pull circuit (such as a hall output circuit of an earphone), the circuit needs to be implemented by adding a corresponding switch tube to the ground or a power source VCC (such as the first switch tube Q1 and the first switch tube Q2);
when the first control terminal of the first switch Q1 of the third function expansion unit receives the signal output by the first push-pull circuit, the fourth resistor R7 is connected to the first resistor R1 through the second resistor R2 and then divides the voltage with the thermistor NTC;
when the first control terminal of the first switch Q2 of the fourth function expansion unit receives the signal output by the first push-pull circuit, the fourth resistor R8 is connected to the first resistor R1 through the second resistor R2 and then divides the voltage with the pull-up resistor R9.
Since the resistance variation of the thermistor NTC is linear and the normal use of the bluetooth headset is in the range of-5 ℃ to 55 ℃, there is only a small section in the range of-40 ℃ to 125 ℃ allowed by the thermistor NTC, and there is still an operable space for adding the function expansion circuit 30.
When no function is input, the voltage acquired by the Bluetooth main control chip through the temperature detection pin is the current temperature value.
When a function is input and the Bluetooth master control chip is pulled to the ground, an instant voltage drop occurs, the Bluetooth master control chip recognizes the drop condition and determines that the function is input, the voltage value read by the temperature detection pin is subtracted by the current temperature value and then is compared with the preset voltage value, and the closest voltage value after comparison is the function to be executed.
When the function input is performed and the Bluetooth master control chip is pulled to the right time, an instant voltage rise occurs, the Bluetooth master control chip recognizes the rising condition and determines that the function input is performed, the voltage value read by the temperature detection pin is subtracted by the current temperature value and then is compared with the preset voltage value, and the closest voltage value after comparison is the function to be executed.
The design key points of the invention lie in that the invention is mainly characterized in that through the matching of the series circuit and a plurality of function expansion units, when a non-temperature detection function is input, the function expansion units and corresponding resistors in the series circuit are connected and then are subjected to voltage division with a pull-up resistor R7 or a thermistor NTC, so that the temperature detection pins sharing the Bluetooth main control chip can be expanded to form a plurality of input ports, and the invention has the functions of key pressing, Hall or charging state and the like, thereby greatly reducing the circuit cost;
and through increasing the series resistance in the series circuit and increasing a plurality of function extension units connected with the power supply VCC or the ground, the extension of functions is enriched, the extension of 256 functions can be realized to the maximum extent, and the development of enterprises and industries is facilitated.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.

Claims (3)

1. The utility model provides a bluetooth headset input port expander circuit which characterized in that: the Bluetooth temperature detection circuit comprises a pull-up resistor, a temperature detection circuit and a function expansion circuit, wherein the temperature detection circuit and the function expansion circuit are connected and form a voltage division node which is commonly connected with a temperature detection pin of a Bluetooth main control chip, the pull-up resistor is provided with a first resistor connecting end and a second resistor connecting end used for being connected with a power supply VCC, and the second resistor connecting end is connected with the voltage division node;
the temperature detection circuit comprises a thermistor NTC and a filter capacitor C1, the first resistor connecting end is grounded through the thermistor NTC, and the voltage division node is grounded through a filter capacitor C1;
the voltage division node is connected with a series circuit, the series circuit comprises a first resistor, a second resistor and a third resistor which are sequentially connected in series, and the function expansion circuit comprises a first function expansion unit to a sixth function expansion unit;
the series node of the first resistor and the second resistor is connected with the second resistor connecting end through the first function expansion unit, and the series node of the first resistor and the second resistor is grounded through the second function expansion unit;
the series node of the second resistor and the third resistor is connected with a second resistor connecting end through a third function expansion unit, and the series node of the second resistor and the third resistor is grounded through a fourth function expansion unit;
the first function expansion unit to the fourth function expansion unit comprise fourth resistors, the first function expansion unit to the fourth function expansion unit also comprise first keys or first switch tubes connected with the fourth resistors in series, and the first switch tubes are provided with first control ends used for being connected with the first push-pull circuits;
the non-series node of the first resistor is connected with a voltage division node, the non-series node of the third resistor is respectively connected with a fifth function expansion unit and a sixth function expansion unit, the fifth function expansion unit comprises a fifth resistor, the fifth resistor is provided with a third resistor connecting end and a fourth resistor connecting end used for connecting a high potential output end of an open leakage circuit, and the third resistor connecting end is connected with the non-series node of the third resistor;
the sixth function expansion unit comprises a sixth resistor, the sixth resistor is provided with a fifth resistor connecting end and a sixth resistor connecting end used for connecting a low potential output end of the open leakage circuit, and the fifth resistor connecting end is connected with a non-series node of the third resistor.
2. The bluetooth headset input port expansion circuit of claim 1, wherein: the series circuit further comprises a seventh resistor connected with the third resistor in series, the function expansion circuit further comprises a seventh function expansion unit, and the series nodes of the third resistor and the seventh resistor are respectively connected with a third resistor connecting end and a fifth resistor connecting end;
the non-series node of the seventh resistor is connected with the second resistor connecting end through a seventh function expansion unit, the seventh function expansion unit comprises an eighth resistor, the seventh function expansion unit further comprises a second key or a second switching tube which is connected with the eighth resistor in series, and the second switching tube is provided with a second control end which is used for being connected with a second push-pull circuit.
3. The bluetooth headset input port expansion circuit of claim 1, wherein: the series circuit further comprises a seventh resistor connected with the third resistor in series, the function expansion circuit further comprises an eighth function expansion unit, and the series nodes of the third resistor and the seventh resistor are respectively connected with a third resistor connecting end and a fifth resistor connecting end;
the non-series node of the seventh resistor is grounded through an eighth function expansion unit, the eighth function expansion unit comprises a ninth resistor, the eighth function expansion unit further comprises a third key or a third switch tube connected with the ninth resistor in series, and the third switch tube is provided with a third control end used for being connected with a third push-pull circuit.
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