CN220935307U - Circuit for solving problems of large leakage current and IO port multiplexing of toggle switch used for earphone - Google Patents
Circuit for solving problems of large leakage current and IO port multiplexing of toggle switch used for earphone Download PDFInfo
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- CN220935307U CN220935307U CN202322557636.3U CN202322557636U CN220935307U CN 220935307 U CN220935307 U CN 220935307U CN 202322557636 U CN202322557636 U CN 202322557636U CN 220935307 U CN220935307 U CN 220935307U
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Abstract
The utility model discloses a circuit for solving the problems of large leakage current and multiplexing of IO ports of a toggle switch used by an earphone, which comprises a power supply circuit and a main control circuit connected with the power supply circuit, wherein the main control circuit is connected with an analog-to-digital conversion circuit which is connected with a switch circuit power supply circuit, the circuit comprises a battery VBAT, and the battery VBAT supplies power for the main control circuit; the main control circuit contains a voltage stabilizer which stabilizes the power supply current of the battery VBAT to obtain 3.3V voltage; the analog-to-digital conversion circuit is electrically connected with the main control circuit, and 3.3V voltage supplies power for the analog-to-digital conversion circuit and passes through SW1 in the analog-to-digital conversion circuit; SW2; SW3, realizing the functions of volume up, volume down, menu selection, etc.
Description
Technical Field
The utility model relates to the technology in the field of earphone circuits, in particular to a circuit for solving the problems of large leakage current and IO port multiplexing of a toggle switch used for an earphone.
Background
The number of bluetooth headsets with various chip schemes in the existing market is not good, wherein the headset with the chip scheme of Chinese blue message (BLUETRUM) is a common one, the SYS_CTRL pin voltage of the chip with the scheme must be smaller than 0.5V and can be started only by maintaining at least 10us, and if the headset is started by using a toggle switch (S1), the following problems are caused:
(1) After the earphone is automatically powered off due to no pairing or over-distance disconnection, the power-off current is larger, the standby time is short, and the experience effect of consumers is often influenced by charging and the like.
(2) In the on state, the voltage of the SYS_CTRL pin is about 0.4V, and the ADC function of the pin cannot be used due to the low voltage, and the situation that an IO port is not distributed enough is often faced in actual use.
Disclosure of utility model
In view of the above, the present utility model aims at overcoming the disadvantages of the prior art, and its main purpose is to provide a circuit for solving the problems of large leakage current and multiplexing of IO ports of a toggle switch used for an earphone.
In order to achieve the above purpose, the present utility model adopts the following technical scheme: a circuit for solving the problems of large leakage current and multiplexing of IO ports of a toggle switch used by an earphone comprises a power supply circuit and a main control circuit connected with the power supply circuit, wherein the main control circuit is connected with an analog-to-digital conversion circuit, and the analog-to-digital conversion circuit is connected with a switch circuit;
The power supply circuit comprises a battery VBAT, and the battery VBAT supplies power for the main control circuit;
The main control circuit contains a voltage stabilizer which stabilizes the power supply current of the battery VBAT to obtain 3.3V voltage;
The analog-to-digital conversion circuit is electrically connected with the main control circuit, and 3.3V voltage supplies power for the analog-to-digital conversion circuit.
Further, BLUETRUM chips, the BLUETRUM chips are specifically four pins, and the first pin VBAT; a second pin GND; a third pin VDDIO; fourth pin sys_ctrl/ADC.
Further, one end VBAT of the first pin is connected with the battery VBAT, the other end of the first pin VBAT is connected with the voltage stabilizer, the second pin GND of the second pin is grounded, one end of the third pin VDDIO is connected with a capacitor C1, the capacitor C1 is a 1UF capacitor, the other end of the third pin VDDIO is connected with the voltage stabilizer, and one end of the capacitor C1 is grounded.
Further, the BLUETRUM chip further includes a resistor R1, where the resistor R1 is a 10K resistor, one end of the resistor R1 is connected to the third pin VDDIO, and the other end of the resistor R1 is connected to the fourth pin sys_ctrl/ADC.
Further, the switch circuit comprises a toggle switch S1, wherein the toggle switch S1 comprises three pins and a pin 1; a foot No. 2; and the pin 3 is connected with the fourth pin SYS_CTRL/ADC, and one end of the pin 3 is grounded.
The analog-to-digital conversion circuit comprises three branch circuits connected in parallel and a capacitor C2 connected with the three branch circuits, wherein one end of the capacitor C2 is connected with a pin 2, and the first branch circuit is connected with the second branch circuit; a second branching circuit vol+; a third branch circuit MENU.
Further, a first branch circuit VOL-, including a switch SW3; one end of the switch SW3 is connected to the resistor R4, the resistor R4 is a 5.1K resistor, the other end of the switch SW1 is connected to the capacitor C2, the capacitor C2 is a 10UF capacitor, one end of the capacitor C2 is connected to a common node between the fourth pin SYS_CTRL/ADC and the pin 1, and one end of the common node between the switch SW3 and the capacitor C2 is grounded.
Further, a second branching circuit vol+ including a switch SW2; and one end of the resistor R3, the switch SW2 is connected with the resistor R3, the resistor R3 is a 10K resistor, the switch SW2 is connected with a common node between the switch SW3 and the capacitor C2, and one end of the resistor R3 is connected with an electronic circuit of the input end of the first branch circuit VOL.
Further, a third branch circuit MENU including a switch SW1; and one end of the resistor R5 is connected with the resistor R5, the resistor R5 is a 20K resistor, the other end of the switch SW1 is connected with a common node between the switch SW3 and the capacitor C2, and one end of the resistor R5 is connected with an electronic circuit of the input end of the second branch circuit VOL+.
Further, the analog-to-digital conversion circuit further includes a resistor R2, where the resistor R2 is a 100k resistor, one end of the resistor R2 is connected to a common node between the pins C2 and 2 of the capacitor, and the other end of the resistor R2 is connected to an electronic circuit at the output end of the second branch circuit vol+.
Compared with the prior art, the utility model has obvious advantages and beneficial effects, in particular, the technical scheme can be known that the SW1 in the analog-digital conversion circuit is adopted; SW2; SW3, realizing the functions of volume up, volume down, menu selection, etc.
By changing the resistance value of the electrical element, the automatic shutdown current is reduced, and the duration of the earphone is prolonged.
In order to more clearly illustrate the structural features and efficacy of the present utility model, the present utility model will be described in detail below with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a circuit diagram of an embodiment of the present utility model.
Detailed Description
Referring to fig. 1, a specific structure of a preferred embodiment of the present utility model is shown, which is a circuit for solving the problems of large leakage current and multiplexing of an IO port of a toggle switch used for an earphone, and includes a power supply circuit; a main control circuit; analog-to-digital conversion circuit and switching circuit.
The main control circuit comprises a BLUETRUM chip, wherein the BLUETRUM chip comprises four pins and a first pin VBAT; a second pin GND; a third pin VDDIO; fourth pin sys_ctrl/ADC.
The battery VBAT is connected with the first pin VBAT, the first pin VBAT is connected with the 3.3V voltage stabilizer to form a power supply circuit, and the characteristic that the voltage difference between the input voltage and the output voltage is small is utilized to obtain a stable 3.3V power supply to enable the BLUETRUM chip to operate, and the whole circuit is powered.
The second pin GND of BLUETRUM chip is grounded, and provides stable reference voltage and return circuit, and the third pin VDDIO of BLUETRUM chip is connected with the voltage regulator to ensure that the IO circuit of BLUETRUM chip works under stable power supply, avoid the interference of voltage fluctuation to the IO circuit, improve the stability and the reliability of chip, simultaneously, the filtering and adjusting function of the voltage regulator can also reduce the influence of noise and interference to the IO circuit, and provide clear and stable signal transmission.
One end of a third pin VDDIO of BLUETRUM chips is connected to a 1UF capacitor C1, one end of the capacitor C1 is grounded, the connection mode is used for providing power supply filtering and stability, and because the 1uF capacitor C1 is used as a power supply filtering capacitor, stable and clean power supply can be provided for BLUETRUM chips by absorbing and reducing high-frequency noise and peak on a power supply line, one terminal of the capacitor C1 is connected to the ground for guiding noise and stray signals to the ground through a ground wire, the high-frequency noise and peak on the power supply line are filtered, the power supply pin VDDIO is ensured to obtain stable power supply, and clean and stable voltage is provided for each functional module of the BLUETRUM chips.
The third pin VDDIO of BLUETRUM chip is connected with 10K resistor R1, the resistor R1 is connected with a fourth pin SYS_CTRL/ADC, and the voltage of VDDIO is reduced to a working range suitable for the ADC module by the partial voltage of the 10K resistor R1, and the main control circuit is formed.
The fourth pin SYS_CTRL/ADC of BLUETRUM chip is connected with the No. 1 pin of the toggle switch S1, the No. 2 pin of the toggle switch S1 is connected with a 10UF capacitor C2, one end of the capacitor C2 is grounded, one end of the No. 3 pin of the toggle switch S1 is grounded to form a switch circuit, and the ON and OFF of the toggle switch S1 are used for controlling the starting and the closing of the earphone.
The common node between the fourth pin SYS_CTRL/ADC and the No. 1 pin is connected with a 20K resistor R5, the resistor R5 is connected with a switch SW1, the switch SW1 is connected with a capacitor C2, the 20K resistor R5 is used as a voltage dividing resistor, the voltage of the common node is divided into lower voltages, the lower voltages are provided for the fourth pin SYS_CTRL/ADC as an input signal, accurate sampling of an external signal is realized, the connection and disconnection of a control circuit of the switch SW1 can be selected through the switching operation of the SW1, and whether the external signal is connected to the common node can be selected, so that the input signal of the fourth pin SYS_CTRL/ADC is influenced.
The public node between the fourth pin SYS_CTRL/ADC and the No. 1 pin is connected with a 10K resistor R3, the resistor R3 is connected with a switch SW2, the switch SW2 is connected with a capacitor C2, the 10K resistor R3 is used as a voltage dividing resistor, the voltage of the public node is divided into lower voltage, the lower voltage is provided for the fourth pin SYS_CTRL/ADC as an input signal, the measurement and the control of an external volume signal are realized, the switch SW2 is used for controlling the adjustment of the volume, the SW2 is a volume increasing switch for VOL+, the increase of the volume can be adjusted by opening or closing the SW2, when the SW2 is closed, the volume signal is not input to the public node, the capacitor C2 is used for filtering and removing high-frequency noise of the signal, the high-frequency noise is removed, the volume signal input to the public node is more stable and accurate, and the measurement and the adjustment of the volume signal can be realized through the voltage dividing function of the resistor R3 and the filtering function of the capacitor C2, and the instability caused by the high-frequency noise is reduced.
The public node between the fourth pin SYS_CTRL/ADC and the No. 1 pin is connected with a 5.1K resistor R4, the resistor R4 is connected with a switch SW3, the switch SW3 is connected with a capacitor C2, the 5.1K resistor R4 is used as a voltage dividing resistor and divides the voltage of the public node into lower voltage, the fourth pin SYS_CTRL/ADC is used as an input signal, thus the measurement and control of an external volume signal can be realized, the switch SW3 is used for controlling the volume adjustment, the SW3 is a volume reducing switch, the volume can be adjusted by opening or closing the SW3, when the SW3 is closed, the volume signal is not input to the public node, the capacitor C2 is used for filtering the signal and removing high-frequency noise, the high-frequency noise is removed, the volume signal input to the public node is more stable and accurate measurement and adjustment of the signal can be realized through the voltage dividing function of the resistor R4 and the filtering function of the capacitor C2, and the instability caused by high-frequency volume can be reduced.
The common node between the pins C2 and 2 is connected with a resistor R2, and one end of the resistor R2 is connected with a switch SW2 to form an analog-digital conversion circuit.
The application thus far;
And (3) normally starting: in the toggle switch circuit, toggle switches S1 to ON are conducted ON pins 1 and 2 of the toggle switch S1, a capacitor C2 is charged instantly by the voltage of a fourth pin SYS_CTRL/ADC of BLUETRUM chips, at the moment, the voltage of the fourth pin SYS_CTRL/ADC is pulled down to 0V to 100us, and a BLUETRUM chip wakes up to execute a starting-up action.
IO port multiplexing: after the capacitor C2 is fully charged, the voltage of the fourth pin SYS_CTRL/ADC is divided by the resistor R1 and the resistor R2 to be maintained at 3V, and when the switch SW1, the switch SW2 and the switch SW3 are respectively pressed down, the voltage division is realized, and the ICSYS _CTRL/ADC detects different voltages to realize the functions of volume up, volume down, menu selection and the like.
And (5) normal shutdown: after the capacitor C2 is fully charged, the voltage of the fourth pin sys_ctrl/ADC is maintained at 3V by the voltage division of the resistor R1 and the resistor R2, when the toggle switch S1 is turned OFF in the toggle switch circuit, the 2 pin and the 3 pin of the toggle switch S1 are turned on, the fourth pin sys_ctrl/ADC is suspended, the voltage is 3.3V, and the bluetooth enum chip performs the shutdown action.
Automatic shutdown current: when the earphone is in a starting-up state, the pin 1 and the pin 2 of the toggle switch S1 are conducted, and after the Bluetooth earphone is automatically shut down due to no pairing, over distance, low electricity and other reasons, the shutdown current is as follows: VDDIO/(r1+r2) =3.3/110=30ua.
The foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the technical scope of the present utility model, so any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical principles of the present utility model are still within the scope of the technical solutions of the present utility model.
Claims (10)
1. The utility model provides a solve earphone and use circuit that toggle switch electric leakage current is big and IO mouth is multiplexing which characterized in that: the power supply circuit is connected with the main control circuit, and the main control circuit is connected with the analog-to-digital conversion circuit which is connected with the switch circuit;
The power supply circuit comprises a battery VBAT, and the battery VBAT supplies power for the main control circuit;
The main control circuit contains a voltage stabilizer which stabilizes the power supply current of the battery VBAT to obtain 3.3V voltage;
The analog-to-digital conversion circuit is electrically connected with the main control circuit, and 3.3V voltage supplies power for the analog-to-digital conversion circuit.
2. The circuit for solving the problem of large leakage current and multiplexing of IO ports of a toggle switch for an earphone according to claim 1, wherein the circuit is characterized in that: the main control circuit comprises a BLUETRUM chip, wherein the BLUETRUM chip comprises four pins and a first pin VBAT; a second pin GND; a third pin VDDIO; fourth pin sys_ctrl/ADC.
3. The circuit for solving the problem of large leakage current and multiplexing of IO ports of a toggle switch for an earphone according to claim 2, wherein the circuit is characterized in that: the first pin VBAT is connected with the battery VBAT, the other end of the first pin VBAT is connected with the voltage stabilizer, the second pin GND is grounded, one end of the third pin VDDIO is connected with a capacitor C1, the capacitor C1 is a 1UF capacitor, the other end of the third pin VDDIO is connected with the voltage stabilizer, and one end of the capacitor C1 is grounded.
4. A circuit for solving the problems of large leakage current and IO port multiplexing of a toggle switch for an earphone according to claim 3, wherein: the BLUETRUM chip also comprises a resistor R1, the resistor R1 is a 10K resistor, one end of the resistor R1 is connected with the third pin VDDIO, and the other end of the resistor R1 is connected with the fourth pin SYS_CTRL/ADC.
5. The circuit for solving the problem of large leakage current and multiplexing of IO ports of a toggle switch for an earphone according to claim 4, wherein the circuit comprises: the switch circuit comprises a toggle switch S1, wherein the toggle switch S1 comprises three pins and a pin 1; a foot No. 2; and the pin 3 is connected with the fourth pin SYS_CTRL/ADC, and one end of the pin 3 is grounded.
6. The circuit for solving the problem of large leakage current and multiplexing of IO ports of a toggle switch for an earphone according to claim 5, wherein the circuit comprises: the analog-to-digital conversion circuit comprises three branch circuits connected in parallel and a capacitor C2 connected with the three branch circuits, wherein one end of the capacitor C2 is connected with a pin 2, and the first branch circuit is connected with the second branch circuit; a second branching circuit vol+; a third branch circuit MENU.
7. The circuit for solving the problem of large leakage current and multiplexing of IO ports of a toggle switch for an earphone according to claim 6, wherein the circuit comprises: the first branch circuit VOL-, including a switch SW3; and one end of the switch SW3 is connected to the resistor R4, the resistor R4 is a 5.1K resistor, the other end of the switch SW3 is connected to the capacitor C2, the capacitor C2 is a 10UF capacitor, one end of the capacitor C2 is connected to a common node between the fourth pin SYS_CTRL/ADC and the No. 1 pin, and one end of the common node between the switch SW3 and the capacitor C2 is grounded.
8. The circuit for solving the problem of large leakage current and multiplexing of IO ports of a toggle switch for an earphone according to claim 7, wherein the circuit comprises: the second branch circuit vol+ includes a switch SW2; and one end of the resistor R3 is connected with the resistor R3, the resistor R3 is a 10K resistor, the switch SW2 is connected with a common node between the switch SW3 and the capacitor C2, and one end of the resistor R3 is connected with an electronic circuit of the VOL-input end of the first branch circuit.
9. The circuit for solving the problem of large leakage current and multiplexing of IO ports of a toggle switch for an earphone according to claim 8, wherein the circuit is characterized in that: the third branch circuit MENU comprises a switch SW1; and one end of the switch SW1 is connected to the resistor R5, the resistor R5 is a 20K resistor, the other end of the switch SW1 is connected to a common node between the switch SW3 and the capacitor C2, and one end of the resistor R5 is connected to an electronic circuit of the input end of the second branch circuit VOL+.
10. The circuit for solving the problem of high leakage current and multiplexing of IO ports of a toggle switch for an earphone according to claim 9, wherein the circuit comprises: the analog-digital conversion circuit further comprises a resistor R2, the resistor R2 is a 100k resistor, one end of the resistor R2 is connected to a common node between the capacitor C2 and the pin 2, and the other end of the resistor R2 is connected to an electronic circuit of the VOL+ output end of the second branch circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322557636.3U CN220935307U (en) | 2023-09-19 | 2023-09-19 | Circuit for solving problems of large leakage current and IO port multiplexing of toggle switch used for earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322557636.3U CN220935307U (en) | 2023-09-19 | 2023-09-19 | Circuit for solving problems of large leakage current and IO port multiplexing of toggle switch used for earphone |
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| Publication Number | Publication Date |
|---|---|
| CN220935307U true CN220935307U (en) | 2024-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322557636.3U Active CN220935307U (en) | 2023-09-19 | 2023-09-19 | Circuit for solving problems of large leakage current and IO port multiplexing of toggle switch used for earphone |
Country Status (1)
| Country | Link |
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| CN (1) | CN220935307U (en) |
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2023
- 2023-09-19 CN CN202322557636.3U patent/CN220935307U/en active Active
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