CN218734259U

CN218734259U - Capacitor touch key control circuit with light prompt function

Info

Publication number: CN218734259U
Application number: CN202222954930.3U
Authority: CN
Inventors: 钟波
Original assignee: Amongo Display Technology Shenzhen Co ltd
Current assignee: Amongo Display Technology Shenzhen Co ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-03-24
Anticipated expiration: 2032-11-07

Abstract

The utility model provides a capacitance touch button control circuit with light prompt facility belongs to control circuit technical field. The utility model discloses a key interface JP 1's input links to each other with the output of intelligent terminal equipment main part, key interface JP 1's output and mains voltage stabilizing circuit's input, the input of intelligent terminal equipment main part links to each other, mains voltage stabilizing circuit's output and light prompt circuit's input, key signal trigger circuit's input links to each other, key signal trigger circuit's output and key interface JP 1's input, light prompt circuit's input links to each other, be equipped with induction sheet subassembly and button touch control chip U2 among the key signal trigger circuit. The utility model has the advantages that: the key touch control chip U2 can control the light prompt circuit to send out the suggestion, can adjust the sensitivity of electric capacity touch key, and stability is strong.

Description

Capacitor touch key control circuit with light prompt function

Technical Field

The utility model relates to a control circuit technical field, concretely relates to electric capacity touch button control circuit with light prompt facility.

Background

The capacitive sensing touch key can penetrate through an insulating material shell for more than 8mm, such as glass, plastic and the like, and can accurately detect the effective touch of a finger. The capacitive sensing touch key is an integrated electronic touch key developed on the basis of a traditional definition key, has the characteristics of quick response time, long service life, strong compatibility and the like compared with the traditional key, has higher requirements on appearance integrity, texture, sensitivity and stability of the key along with the fact that people have higher and higher requirements on the key, and the traditional key is more and more difficult to meet the requirements of people.

At present, the capacitive touch keys on the market have single general functions, often have only a signal triggering function, do not have a light prompting feedback function, and cannot judge whether a signal is successfully triggered during touch; most of the existing capacitive touch keys on the market are poor in stability, are too sensitive to touch and are easy to cause false touch, or are too dull to touch, so that the touch of people is difficult to respond quickly, and the sensitivity range cannot be adjusted; in addition, the power supply voltage of the existing capacitor touch key on the market is not stable enough, and the sensitivity of the capacitor touch key is influenced.

SUMMERY OF THE UTILITY MODEL

For solving the problem among the prior art, the utility model provides a capacitance touch button control circuit with light prompt facility, through setting up the mains voltage stabilizing circuit of mutually supporting, light prompt circuit and key signal trigger circuit, mains voltage stabilizing circuit can adjust mains voltage and provide stable 5V voltage for light prompt circuit and key signal trigger circuit, fluctuation range is only 0.1V, capacitance touch button's stability has been strengthened, button touch control chip U2 in the key signal trigger circuit can control light prompt circuit and send the suggestion when response piece subassembly produces trigger signal, the signal that clearly shows capacitance touch button triggers is whether to trigger successfully, improve capacitance touch button's functionality, and can adjust capacitance touch button's sensitivity through button touch control chip U2, and is convenient and practical, high stability, the problem of capacitance touch button among the prior art does not possess light prompt facility, poor stability, do not possess stable power supply is solved.

The utility model provides a pair of electric capacity touch key control circuit with light prompt facility sets up in the electric capacity touch key that links to each other with intelligent terminal equipment main part, including key interface JP1, supply voltage stabilizing circuit, light prompt circuit and key signal trigger circuit, be equipped with the power in the intelligent terminal equipment main part, key interface JP1 with the intelligent terminal equipment main part links to each other, key interface JP 1's output with supply voltage stabilizing circuit's input links to each other, supply voltage stabilizing circuit's output with the input of light prompt circuit the input of key signal trigger circuit links to each other, key signal trigger circuit's output with key interface JP 1's input light prompt circuit's input links to each other, be equipped with the response piece subassembly and the key touch control chip U2 of interconnect among the key signal trigger circuit, supply voltage can adjust supply voltage and do light prompt circuit with key signal trigger circuit steady voltage supplies power, key touch control chip U2 can control when the light response piece subassembly produces trigger signal prompt the prompt circuit sends the suggestion.

The utility model discloses make further improvement, key interface JP1 one side with intelligent terminal equipment main part electricity is connected, and the opposite side is equipped with 5 pins, key interface JP 1's 1 st pin with mains voltage stabilizing circuit's input links to each other, key interface JP 1's 4 th pin ground connection, key interface JP 1's 5 th pin with key signal trigger circuit's output links to each other.

The utility model discloses do further improvement, mains voltage stabilizing circuit includes steady voltage chip U1, resistance R1, electric capacity C4, electric capacity C5 and fuse F1, wherein, steady voltage chip U1 is equipped with 6 pins, steady voltage chip U1's 3 rd pin with resistance R1's one end electric capacity C4's one end electric capacity C5's one end fuse F1's one end links to each other, fuse F1's the other end with key interface JP 1's the 1 st pin links to each other, steady voltage chip U1's the 5 th pin with resistance R1's the other end links to each other, steady voltage chip U1's the 1 st pin electric capacity C4's the other end electric capacity C5's other end ground connection.

The utility model discloses make further improvement, supply voltage stabilizing circuit still includes resistance R2, resistance R3, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C6, 5V voltage output interface and inductance L1, wherein, steady voltage chip U1's 6 th pin with electric capacity C1's one end links to each other, electric capacity C1's the other end with steady voltage chip U1's 2 nd pin inductance L1's one end links to each other, steady voltage chip U1's 4 th pin with resistance R2's one end resistance R3's one end electric capacity C6's one end links to each other, inductance L1's the other end with resistance R2's the other end electric capacity C2's one end electric capacity C3 the other end electric capacity C6 the 5V voltage output interface the input of light suggestion circuit the input of key signal trigger circuit links to each other, electric capacity C2's the other end electric capacity C3 the other end resistance R3's the other end ground connection.

The utility model discloses make further improvement, key signal trigger circuit still includes resistance R5, resistance R6, electric capacity C7, electric capacity C8 and electric capacity C9, the response piece subassembly is response piece TP1, wherein, key touch control chip U2 is equipped with 6 pins, key touch control chip U2's 1 st pin with resistance R5's one end links to each other, another termination of resistance R5 response piece TP1, key touch control chip U2's 3 rd pin with electric capacity C8's one end the 5 th pin of key interface JP1 links to each other, resistance R6's the other end with 5V voltage output interface links to each other, key touch control chip U2's 4 th pin with electric capacity C8's one end electric capacity C9's one end links to each other, key touch control chip U2's 5 th pin with electric capacity C7's one end the 5V voltage output interface links to each other, key touch control chip U2's 6 th pin with the input of suggestion circuit links to each other, key touch control chip U2's the other end the electric capacity C7 the other end the light C8 other end the other end of light C9.

The utility model discloses do further improvement, light prompting circuit includes resistance R4, emitting diode LED1 and NPN type triode Q1, wherein, NPN type triode Q1's base with button touch control chip U2's the 6 th pin links to each other, NPN type triode Q1's collecting electrode with emitting diode LED 1's negative pole links to each other, emitting diode LED 1's positive pole with resistance R4's one end links to each other, resistance R4's the other end with 5V voltage output interface links to each other, NPN type triode Q1's projecting pole ground connection.

The utility model discloses make further improvement, button touch control chip U2's model is ADA02-Y.

The utility model discloses make further improvement, steady voltage chip U1's model is TMI3252.

The utility model discloses make further improvement, supply voltage stabilizing circuit's input voltage range is 6V-18V, the voltage range of 5V voltage output kneck output is 4.9V-5.1V.

The utility model discloses make further improvement, button touch control chip U2's 3 rd pin output extremely the signal of key interface JP 1's 5 th pin is 60HzPWM square wave signal.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides a capacitance touch button control circuit with light prompt facility, through setting up the mains voltage stabilizing circuit who mutually supports, light prompt circuit and key signal trigger circuit, mains voltage stabilizing circuit can adjust mains voltage and provide stable 5V voltage for light prompt circuit and key signal trigger circuit, fluctuation range is only 0.1V, the stability of capacitance touch button has been strengthened, button touch control chip U2 in the key signal trigger circuit can control light prompt circuit and send the suggestion when response piece subassembly produces trigger signal, clearly show whether the signal of capacitance touch button triggers successfully, improve the functionality of capacitance touch button, and can adjust the sensitivity of capacitance touch button through button touch control chip U2, and is convenient and practical, and stability is strong, the problem of capacitance touch button in the prior art does not possess light prompt facility, stability is relatively poor, do not possess stable power supply is solved.

Drawings

In order to more clearly illustrate the present application or prior art solutions, a brief description of the drawings needed for the embodiments or prior art descriptions is provided below, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.

Fig. 1 is a voltage stabilizing circuit diagram of the power supply voltage of the capacitive touch key control circuit with the light prompt function of the present invention;

fig. 2 is a key signal trigger circuit diagram of the capacitive touch key control circuit with a light prompt function of the present invention;

fig. 3 is the utility model discloses electric capacity touch key control circuit's light prompt circuit diagram with light prompt facility.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof in the description and claims of this application and the description of the figures above, are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

As shown in FIGS. 1-3, the utility model provides a capacitance touch key control circuit with light prompt function, which is arranged in a capacitance touch key connected with an intelligent terminal device main body, comprising a key interface JP1, a power supply voltage stabilizing circuit, a light prompt circuit and a key signal trigger circuit, wherein a power supply is arranged in the intelligent terminal device main body, the key interface JP1 is connected with the intelligent terminal device main body, the output end of the key interface JP1 is connected with the input end of the power supply voltage stabilizing circuit, the output end of the power supply voltage stabilizing circuit is connected with the input end of the light prompt circuit and the input end of the key signal trigger circuit, the output end of the key signal trigger circuit is connected with the input end of the key interface JP1 and the input end of the light prompt circuit, be equipped with interconnect's response piece subassembly and button touch control chip U2 among the key signal trigger circuit, supply voltage stabilizing circuit can adjust mains voltage and provide stable 5V voltage for light suggestion circuit and key signal trigger circuit, fluctuation range is only 0.1V, the stability of electric capacity touch button has been strengthened, button touch control chip U2 in the key signal trigger circuit can control light suggestion circuit and send the suggestion when response piece subassembly produces trigger signal, whether the signal of clear display electric capacity touch button triggers successfully, improve the functional of electric capacity touch button, and can adjust the sensitivity of electric capacity touch button through button touch control chip U2, and is convenient and practical, and high stability.

As shown in figure 1, one side of the key interface JP1 is electrically connected with the intelligent terminal device main body, 5 pins are arranged on the other side of the key interface JP1, the 1 st pin of the key interface JP1 is connected with the input end of the power supply voltage stabilizing circuit, the 4 th pin of the key interface JP1 is grounded, and the 5 th pin of the key interface JP1 is connected with the output end of the key signal trigger circuit. In this embodiment, the key interface is used for connecting the capacitive touch key to the intelligent terminal device main body, and can transmit signal interaction between the capacitive touch key and the intelligent terminal device main body and supply power to the capacitive touch key.

As shown in FIG. 1, the power voltage stabilizing circuit comprises a voltage stabilizing chip U1, a resistor R1, a capacitor C4, a capacitor C5 and a fuse F1, wherein the voltage stabilizing chip U1 is provided with 6 pins, a pin 3 of the voltage stabilizing chip U1 is connected with one end of the resistor R1, one end of the capacitor C4, one end of the capacitor C5 and one end of the fuse F1, the other end of the fuse F1 is connected with a pin 1 of a key interface JP1, a pin 5 of the voltage stabilizing chip U1 is connected with the other end of the resistor R1, the pin 1 of the voltage stabilizing chip U1, the other end of the capacitor C4 and the other end of the capacitor C5 are grounded, the power voltage stabilizing circuit further comprises a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C6, a 5V voltage output interface and an inductor L1, wherein, the 6 th pin of regulator chip U1 links to each other with electric capacity C1's one end, electric capacity C1's the other end and regulator chip U1's 2 nd pin, inductance L1's one end links to each other, regulator chip U1's the 4 th pin and resistance R2's one end, resistance R3's one end, electric capacity C6's one end links to each other, inductance L1's the other end and resistance R2's the other end, electric capacity C2's one end, electric capacity C3's one end, electric capacity C6's the other end, 5V voltage output interface, the input of light suggestion circuit, key signal trigger circuit's input links to each other, electric capacity C2's the other end, electric capacity C3's the other end, resistance R3's the other end ground connection. In the embodiment, the voltage range of the input end of the power supply voltage stabilizing circuit is 6-18V, the voltage range output at the voltage output interface of 5V is 4.9-5.1V, the stability of the capacitive touch key is enhanced, and the model of the voltage stabilizing chip U1 is TMI3252.

In this embodiment, a power supply of the intelligent terminal device main body provides a direct current 6V-18V power supply, the voltage stabilizing chip U1 supports wide voltage input, and after passing through the key interface JP1, the fuse F1, the capacitor C4 and the capacitor C5 are subjected to filtering processing and are conveyed to an input end of the voltage stabilizing chip U1, the voltage is adjusted to be direct current 5V used by the key touch control chip U2 through the processing of the voltage stabilizing chip U1, the fluctuation range is only 0.1V, the capacitor C2 is reused to perform filtering processing on the output voltage, and finally the output voltage is transmitted to the key touch control chip U2, wherein the resistor R1 is a starting resistor of the voltage stabilizing chip U1, the capacitor C1 is a compensation capacitor of the voltage stabilizing chip U1, the inductor L1 is an energy storage inductor, the capacitor C3 is an energy storage capacitor, the resistor R2 and the resistor R3 form a voltage dividing circuit to provide a proper feedback voltage for the voltage stabilizing chip U1, and the capacitor C6 is a compensation capacitor of the feedback voltage.

As shown in fig. 2, the key signal trigger circuit further includes a resistor R5, a resistor R6, a capacitor C7, a capacitor C8 and a capacitor C9, the sensor chip assembly is a sensor chip TP1, wherein the key touch control chip U2 is provided with 6 pins, the 1 st pin of the key touch control chip U2 is connected to one end of the resistor R5, the other end of the resistor R5 is connected to the sensor chip TP1, the 3 rd pin of the key touch control chip U2 is connected to one end of the resistor R6 and the 5 th pin of the key interface JP1, the other end of the resistor R6 is connected to the 5V voltage output interface, the 4 th pin of the key touch control chip U2 is connected to one end of the capacitor C8 and one end of the capacitor C9, the 5 th pin of the key touch control chip U2 is connected to one end of the capacitor C7 and the 5V voltage output interface, the 6 th pin of the key touch control chip U2 is connected to the input end of the light prompting circuit, and the 2 nd pin of the touch control chip U2, the other end of the capacitor C7, the other end of the capacitor C8 and the other end of the capacitor C9 are grounded. In this embodiment, the signal output from pin 3 of the key touch control chip U2 to pin 5 of the key interface JP1 is a 60hz pwm square wave signal; the type of the key touch control chip U2 is ADA02-Y. The PWM is a very effective technology for controlling an analog circuit by utilizing digital output of a microprocessor, and is widely applied to a plurality of fields from measurement and communication to power control and conversion, the pulse width modulation is an analog control mode, the bias of a transistor base electrode or an MOS tube grid electrode is modulated according to the change of corresponding load to change the conduction time of a transistor or the MOS tube, so that the change of the output of a switching voltage-stabilized power supply is realized, the mode can keep the output voltage of a power supply constant when the working condition changes, the PWM is a very effective technology for controlling the analog circuit by utilizing digital signals of the microprocessor, and the PWM is a control mode which is most widely applied to power electronic technology and is a hotspot of research by people due to the advantages of simple control, flexibility and good dynamic response of the PWM; in this embodiment, the signal fed back to the intelligent terminal device main body by the capacitive touch key is a 60hz pwm square wave signal, and the response is rapid and accurate.

As shown in fig. 3, the light prompting circuit includes a resistor R4, a light emitting diode LED1 and an NPN type triode Q1, wherein a base of the NPN type triode Q1 is connected to a pin 6 of the key touch control chip U2, a collector of the NPN type triode Q1 is connected to a negative electrode of the light emitting diode LED1, a positive electrode of the light emitting diode LED1 is connected to one end of the resistor R4, the other end of the resistor R4 is connected to the 5V voltage output interface, and an emitter of the NPN type triode Q1 is grounded.

In this embodiment, through the sensing area of the touch sensing chip TP1, through the adjustment of the adaptive resistor R5, the resistor R5 is used for preventing false triggering and improving stability, the false triggering is input to the key touch control chip U2, through the processing of the key touch control chip U2, through the pull-up resistor R6, a 60hz pwm square wave signal is output, the 5 th pin of the key interface JP1 is transmitted to the intelligent terminal device main body, and at the same time, a light signal is output to the NPN type triode Q1 at the 6 th pin of the key touch control chip U2, through the light emitting diode LED1 and the current limiting resistor R4, whether the signal of the clear display capacitor touch key is successfully triggered can be indicated through light, and the light brightness can be controlled and adjusted through the key touch control chip U2. The capacitor C7 is a filter capacitor and provides stable working voltage for the key touch control chip U2, the capacitor C8 and the capacitor C9 can adjust the sensitivity of the capacitor touch key, and the key sensitivity is adjusted by adjusting the capacitance value of the capacitor.

By last, the utility model provides an electric capacity touch button control circuit with light prompt facility, through setting up the mains voltage stabilizing circuit of mutually supporting, light prompt circuit and key signal trigger circuit, mains voltage stabilizing circuit can adjust mains voltage and provide stable 5V voltage for light prompt circuit and key signal trigger circuit, fluctuation range is only 0.1V, electric capacity touch button's stability has been strengthened, button touch control chip U2 in the key signal trigger circuit can control light prompt circuit and send the suggestion when response piece subassembly produces trigger signal, whether the signal that clearly shows electric capacity touch button triggers successfully, improve electric capacity touch button's functionality, and can adjust electric capacity touch button's sensitivity through button touch control chip U2, and is convenient and practical, high stability, the problem of electric capacity touch button among the prior art does not possess light prompt facility, stability is relatively poor, stable power supply does not possess.

The above-mentioned embodiments are the preferred embodiments of the present invention, and the scope of the present invention is not limited to the above-mentioned embodiments, and the scope of the present invention includes and is not limited to the above-mentioned embodiments, and all equivalent changes made according to the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a capacitance touch button control circuit with light prompt facility sets up in the capacitance touch button who links to each other with intelligent terminal equipment main part, its characterized in that: the intelligent terminal equipment comprises a key interface JP1, a power supply voltage stabilizing circuit, a light prompting circuit and a key signal trigger circuit, wherein a power supply is arranged in the intelligent terminal equipment main body, the key interface JP1 is connected with the intelligent terminal equipment main body, the output end of the key interface JP1 is connected with the input end of the power supply voltage stabilizing circuit, the output end of the power supply voltage stabilizing circuit is connected with the input end of the light prompting circuit and the input end of the key signal trigger circuit, the output end of the key signal trigger circuit is connected with the input end of the key interface JP1 and the input end of the light prompting circuit, an induction sheet assembly and a key touch control chip U2 which are mutually connected are arranged in the key signal trigger circuit, the power supply voltage stabilizing circuit can adjust the power supply voltage and supply power for the light prompting circuit and the key signal trigger circuit in a voltage stabilizing manner, and the key touch control chip U2 can control the light prompting circuit to send out prompts when the induction sheet assembly generates trigger signals.

2. The capacitive touch key control circuit with a light prompt function of claim 1, wherein: one side of the key interface JP1 is electrically connected with the intelligent terminal device main body, 5 pins are arranged on the other side of the key interface JP1, the 1 st pin of the key interface JP1 is connected with the input end of the power supply voltage stabilizing circuit, the 4 th pin of the key interface JP1 is grounded, and the 5 th pin of the key interface JP1 is connected with the output end of the key signal trigger circuit.

3. The capacitive touch key control circuit with a light prompt function of claim 2, wherein: the power supply voltage stabilizing circuit comprises a voltage stabilizing chip U1, a resistor R1, a capacitor C4, a capacitor C5 and a fuse F1, wherein the voltage stabilizing chip U1 is provided with 6 pins, the 3 rd pin of the voltage stabilizing chip U1 is connected with one end of the resistor R1, one end of the capacitor C4, one end of the capacitor C5 and one end of the fuse F1, the other end of the fuse F1 is connected with the 1 st pin of the key interface JP1, the 5 th pin of the voltage stabilizing chip U1 is connected with the other end of the resistor R1, and the 1 st pin of the voltage stabilizing chip U1, the other end of the capacitor C4 and the other end of the capacitor C5 are grounded.

4. The capacitive touch key control circuit with a light prompt function of claim 3, wherein: the power voltage stabilizing circuit further comprises a resistor R2, a resistor R3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C6, a 5V voltage output interface and an inductor L1, wherein a 6 th pin of the voltage stabilizing chip U1 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with a 2 nd pin of the voltage stabilizing chip U1 and one end of the inductor L1, a 4 th pin of the voltage stabilizing chip U1 is connected with one end of the resistor R2, one end of the resistor R3 and one end of the capacitor C6, the other end of the inductor L1 is connected with the other end of the resistor R2, one end of the capacitor C3, the other end of the capacitor C6, the 5V voltage output interface, an input end of the light prompting circuit and an input end of the key signal trigger circuit, and the other end of the capacitor C2, the other end of the capacitor C3 and the other end of the resistor R3 are grounded.

5. The capacitive touch key control circuit with a light prompt function of claim 4, wherein: the key signal trigger circuit further comprises a resistor R5, a resistor R6, a capacitor C7, a capacitor C8 and a capacitor C9, the sensor chip assembly is a sensor chip TP1, wherein the key touch control chip U2 is provided with 6 pins, the 1 st pin of the key touch control chip U2 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with the sensor chip TP1, the 3 rd pin of the key touch control chip U2 is connected with one end of the resistor R6 and the 5 th pin of the key interface JP1, the other end of the resistor R6 is connected with the 5V voltage output interface, the 4 th pin of the key touch control chip U2 is connected with one end of the capacitor C8 and one end of the capacitor C9, the 5 th pin of the key touch control chip U2 is connected with one end of the capacitor C7 and the 5V voltage output interface, the 6 th pin of the key touch control chip U2 is connected with the input end of the light prompting circuit, and the 2 nd pin of the key touch control chip U2, the other end of the capacitor C7, the other end of the capacitor C8 and the other end of the capacitor C9 are grounded.

6. The capacitive touch key control circuit with a light prompt function of claim 5, wherein: the light prompting circuit comprises a resistor R4, a light emitting diode LED1 and an NPN type triode Q1, wherein the base electrode of the NPN type triode Q1 is connected with the 6 th pin of the key touch control chip U2, the collector electrode of the NPN type triode Q1 is connected with the negative electrode of the light emitting diode LED1, the positive electrode of the light emitting diode LED1 is connected with one end of the resistor R4, the other end of the resistor R4 is connected with the 5V voltage output interface, and the emitting electrode of the NPN type triode Q1 is grounded.

7. The capacitive touch key control circuit with a light prompt function of claim 6, wherein: the type of the key touch control chip U2 is ADA02-Y.

8. The capacitive touch key control circuit with a light prompt function of claim 7, wherein: the model of the voltage stabilizing chip U1 is TMI3252.

9. The capacitive touch key control circuit with the light prompt function according to claim 8, wherein: the voltage range of the input end of the power voltage stabilizing circuit is 6V-18V, and the voltage range output at the 5V voltage output interface is 4.9V-5.1V.

10. The capacitive touch key control circuit with a light prompt function of claim 9, wherein: the signal output from the 3 rd pin of the key touch control chip U2 to the 5 th pin of the key interface JP1 is a 60hz pwm square wave signal.