Key multi-output circuit and electronic equipment

Abstract

The utility model provides a key multi-output circuit and an electronic device, and relates to the technical field of circuits, the key multi-output circuit comprises a function key, a key signal output module and a key signal control module, the key signal output module and the key signal control module are combined to realize the output of two paths of function signals when one function key is pressed down, so that one function key can realize two functions. In this way, the defect that a single function key correspondingly achieves a single function can be avoided, the memory cost of a user for the key function can be reduced, the number of holes in a shell of the electronic equipment where the key multi-output circuit is located can be reduced, the influence of the hole number on the appearance and quality of the electronic equipment is reduced, and the user experience is improved. In addition, the limitation on the number of functions configured by the electronic equipment due to the size of the electronic equipment can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a key multi-output circuit and electronic equipment. Background Art

[0002] With the advancement of science and technology, people are not only exposed to more and more smart electronic devices, but also gradually begin to have higher demands on the functions, appearance and quality of smart electronic devices.

[0003] In many existing smart electronic devices, multiple buttons are often added to the product in order to achieve more functions. Different buttons can achieve different functions, making the electronic device more intelligent.

[0004] However, electronic devices use different buttons to achieve different functions, and users need to remember the functions achieved by each button, which increases the user's memory cost. In fact, some functions of some electronic devices are not always needed, such as the power-on function. Moreover, each button requires a hole to be opened in the shell of the electronic device. More holes will also have a greater impact on the appearance and quality of the electronic device, reducing the user experience. In addition, due to the size of the electronic device, the number of buttons configured is limited, which will limit the number of functions configured for the electronic device. Utility Model Content

[0005] The utility model provides a key multi-output circuit and electronic equipment, which are used to solve the defects in the prior art.

[0006] The utility model provides a key multi-output circuit, comprising: a function key, a key signal output module and a key signal control module;

[0007] The key signal output module includes a first branch and a second branch;

[0008] The key signal control module includes a switch unit;

[0009] The first end of the function key is respectively connected to the key power supply and the switch unit through the first branch, and is respectively connected to the power pin and the general input and output pin of the main control chip through the second branch, and the second end of the function key is grounded;

[0010] The switch unit receives a low level signal and turns on when the function key is pressed;

[0011] The switch unit is connected to the non-shielding interrupt pin of the main control chip. The main control chip is configured with a power management unit. The power management unit is used to be awakened when the non-shielding interrupt pin receives a low-level signal and provide a power signal through the power pin.

[0012] According to a key multi-output circuit provided by the utility model, the first branch includes a first diode and a first resistor, and the second branch includes a second diode and a second resistor;

[0013] The anode of the first diode is connected to the switch unit and connected to the key power supply through the first resistor, and the cathode of the first diode is connected to the first end of the function key;

[0014] The anode of the second diode is connected to the general input / output pin and is connected to the power pin via the second resistor. The cathode of the second diode is connected to the first end of the function key.

[0015] According to a key multi-output circuit provided by the utility model, the key signal control module further includes a trigger unit;

[0016] The trigger unit is connected to the power pin and the key power supply respectively, and is used to trigger the switch unit to turn off when receiving the power signal.

[0017] According to a key multi-output circuit provided by the utility model, the trigger unit includes a first triode;

[0018] The base of the first transistor is connected to the power pin;

[0019] The collector of the first transistor is connected to the key power supply and the switch unit respectively;

[0020] The emitter of the first transistor is grounded.

[0021] According to a key multi-output circuit provided by the utility model, the trigger unit further includes a third resistor, a fourth resistor and a fifth resistor;

[0022] The collector of the first transistor is connected to the key power supply through the third resistor;

[0023] The base of the first transistor is connected to the power pin through the fourth resistor and is grounded through the fifth resistor.

[0024] According to a key multi-output circuit provided by the utility model, the trigger unit further includes a sixth resistor;

[0025] The base of the first transistor is connected to the switch unit through the sixth resistor.

[0026] According to a key multi-output circuit provided by the utility model, the trigger unit further includes a first capacitor;

[0027] The collector of the first transistor is grounded through the first capacitor.

[0028] According to a key multi-output circuit provided by the utility model, the first diode and the second diode are both Schottky diodes.

[0029] According to a key multi-output circuit provided by the utility model, the switch unit includes a field effect tube;

[0030] The drain of the field effect tube is connected to the non-shielding interrupt pin;

[0031] The gate of the field effect tube is connected to the key power supply;

[0032] The source of the field effect tube is connected to the first end of the function key and the key power supply through the first branch.

[0033] According to a key multi-output circuit provided by the utility model, the switch unit includes a second triode;

[0034] The collector of the second transistor is connected to the non-shielding interrupt pin;

[0035] The base of the second transistor is connected to the key power supply;

[0036] The emitter of the second transistor is connected to the first end of the function key and the key power supply through the first branch.

[0037] The utility model also provides an electronic device, comprising the key multi-output circuit.

[0038] The utility model provides a key multi-output circuit and an electronic device, wherein the key multi-output circuit includes: a function key, a key signal output module and a key signal control module. The key signal output module and the key signal control module can realize the output of two function signals when a function key is pressed, so that one function key can realize two functions. In this way, the defect of a single function key corresponding to a single function can be avoided, which can reduce the user's memory cost of the key function, and can also reduce the number of openings in the shell of the electronic device where the key multi-output circuit is located, reduce the impact of the number of openings on the appearance and quality of the electronic device, and improve the user experience. In addition, the limitation on the number of functions configured in the electronic device due to the size of the electronic device can also be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, for ordinary technicians in this field, other drawings can be obtained based on the drawings in the following description without creative work.

[0040] Figure 1 This is one of the structural schematic diagrams of the key multi-output circuit provided by the utility model;

[0041] Figure 2 This is the second structural diagram of the key multi-output circuit provided by the utility model;

[0042] Figure 3 This is the third structural diagram of the key multi-output circuit provided by the utility model;

[0043] Figure 4 This is one of the structural schematic diagrams of the key signal control module in the key multi-output circuit provided by the utility model;

[0044] Figure 5 This is the second structural schematic diagram of the key signal control module in the key multi-output circuit provided by the utility model;

[0045] Figure 6 This is the third structural diagram of the key signal control module in the key multi-output circuit provided by the utility model;

[0046] Figure 7 It is a structural schematic diagram of the electronic equipment provided by the utility model. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0048] The term "first" or "second" in the specification and claims of the utility model may explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0049] In order to solve the defect of each key realizing one function in the prior art, a key multi-output circuit is provided in the embodiment of the utility model. When a key is pressed continuously or continuously, different functions can be realized by outputting different signals.

[0050] Figure 1 Schematic diagram of a key multi-output circuit provided in an embodiment of the utility model. Figure 1 As shown, the key multi-output circuit includes: a function key S1, a key signal output module 1 and a key signal control module 2.

[0051] The key signal output module 1 includes a first branch 11 and a second branch 12 .

[0052] The key signal control module 2 includes a switch unit 21 .

[0053] The first end of the function key S1 is connected to the key power supply VCC-RTC and the switch unit 21 through the first branch 11, and is connected to the power pin V1 and the general-purpose input / output (GPIO) pin of the main control chip U1 through the second branch 12. The second end of the function key S1 is grounded.

[0054] The switch unit 21 is connected to a non-maskable interrupt (NMI) pin of the main control chip U1 .

[0055] When the function key S1 is pressed, the switch unit 21 receives a low level signal and is turned on.

[0056] The main control chip U1 is also configured with a power management integrated circuit (PMIC). The PMIC is used to be awakened when the NMI pin receives a low-level signal and provide a power signal VCC through the power pin V1.

[0057] Specifically, the key multi-output circuit provided in the embodiment of the utility model may include: a function key S1, a key signal output module 1 and a key signal control module 2. The function key S1 may be a mechanical key or a dome key, which is not specifically limited here. Figure 1 The function key S1 shown in FIG. 1 is a mechanical key.

[0058] The key power supply VCC-RTC can be a normal power supply and can be powered by a battery. There is no specific limitation here. The key power supply VCC-RTC can take a value between 1.8V and 3.3V.

[0059] On the one hand, when the function key S1 is not pressed, the first end of the function key S1 is suspended and not grounded. The first signal POWER-ON transmitted by the first branch 11 received by the switch unit 21 is pulled up to a high level by the key power supply VCC-RTC. The second signal SCAN-KEY transmitted by the second branch 12 received by the main control chip U1 does not exist because the first end of the function key S1 is suspended and the power pin V1 is without power.

[0060] Moreover, at this time, the switch unit 21 will not be turned on because the received first signal POWER-ON is at a high level, and thus cannot establish signal transmission with the main control chip U1.

[0061] On the other hand, when the function key S1 is pressed, the switch unit 21 receives the low-level signal and turns on, transmitting the low-level signal to the NMI pin of the main control chip U1. The NMI pin of the main control chip U1 is connected to the power button of the electronic device where the main control chip U1 is located, thereby realizing the power-on function of the electronic device where the main control chip U1 is located.

[0062] When the electronic device where the main control chip U1 is located is turned on, the PMIC works and can provide a power signal VCC through the power pin V1. The voltage value of the power signal VCC can be 3.3V.

[0063] At this time, if the function key S1 is pressed again, the second branch 12 is turned on, and the GPIO interface of the main control chip U1 can receive the second signal SCAN-KEY and identify it normally.

[0064] Combined with the working principles of the key signal output module 1 and the key signal control module 2, the working process of the entire key multi-output circuit is: when the function key S1 is not pressed, the switch unit 21 is not turned on, the main control chip U1 is not working, and the entire key multi-output circuit is in a stable state. When the function key S1 is pressed: the state of the first signal POWER-ON output by the key signal output module 1 through the first branch follows the state of the function key S1. When the function key S1 is pressed, the first signal POWER-ON is at a low level, and when the function key S1 is released, the first signal POWER-ON is at a high level.

[0065] For the key signal output module 1 , the power pin V1 needs to have electrical properties only after the electronic device where the main control chip U1 is located is powered on, thereby providing the power signal VCC.

[0066] For the key signal control module 2 , the switch unit 21 is turned on only when the first signal POWER-ON is at a low level. Since the function key S1 is not pressed in the initial state, the initial state of the switch unit 21 is non-conductive.

[0067] The key signal output module 1 is combined with the key signal control module 2, and when the function key S1 is pressed, the switch unit 21 is turned on, and the low-level signal is transmitted to the NMI pin of the main control chip U1, and the electronic device where the main control chip U1 is located is turned on. Therefore, the key multi-output circuit can output a low-level signal for controlling the electronic device where the main control chip U1 is located to turn on through the switch unit 21.

[0068] Furthermore, after the electronic device where the main control chip U1 is located is turned on, the PMIC works, and the power signal VCC is provided through the power pin V1 of the main control chip U1, and the second branch 12 is turned on. When the function button S1 is pressed again, the second signal SCAN-KEY can be sent to the GPIO pin of the main control chip U1 through the second branch 12 to implement the corresponding function. For example, the second signal SCAN-KEY can be used to implement any one of the functions such as scanning function, search function, and answering function. Therefore, the key multi-output circuit can output the second signal SCAN-KEY for controlling the electronic device where the main control chip U1 is located to implement the corresponding function through the second branch 12.

[0069] The key multi-output circuit provided in the embodiment of the utility model includes: a function key, a key signal output module and a key signal control module. The key signal output module and the key signal control module can realize the output of two function signals when a function key is pressed, so that one function key can realize two functions. In this way, the defect of a single function key corresponding to a single function can be avoided, which can not only reduce the user's memory cost of the key function, but also reduce the number of openings in the shell of the electronic device where the key multi-output circuit is located, reduce the impact of the number of openings on the appearance and quality of the electronic device, and improve the user experience. In addition, it can also reduce the restrictions on the number of functions configured on the electronic device due to the size of the electronic device.

[0070] Based on the above embodiments, Figure 2 As shown, the first branch 11 includes a first diode D1 and a first resistor R1, and the second branch 12 includes a second diode D2 and a second resistor R2.

[0071] The anode of the first diode D1 is connected to the switch unit 21 and is connected to the key power source VCC-RTC through the first resistor R1 . The cathode of the first diode D1 is connected to the first end of the function key S1 .

[0072] The anode of the second diode D2 is connected to the GPIO pin of the main control chip U1 and is connected to the power pin V1 through the second resistor R2. The cathode of the second diode D2 is connected to the first end of the function key S1.

[0073] Specifically, the first diode D1 and the second diode D2 may both be Schottky diodes, which can ensure good performance of the first branch and the second branch.

[0074] When the function key S1 is not pressed, the cathode of the first diode D1 is suspended, the anode of the first diode D1 can be stabilized at a high level by the first resistor R1, and the switch unit 21 is not turned on. The anode and cathode of the second diode D2 are both suspended, and the second signal SCAN-KEY cannot be generated.

[0075] When the function key S1 is pressed, the cathode of the first diode D1 is at a low level, the first diode D1 is turned on, and the anode of the first diode D1 is stabilized at a low level through the first resistor R1, the switch unit 21 is turned on, and the low level signal is transmitted to the NMI pin of the main control chip U1, and the electronic device where the main control chip U1 is located is turned on. The PMIC works, and the power signal VCC is provided through the power pin V1 of the main control chip U1, and the first branch 11 is turned on.

[0076] When the function key S1 is pressed again, the second signal SCAN-KEY is sent to the GPIO pin of the main control chip U1 through the second branch 11 to implement the corresponding function. At this time, the anode of the second diode D2 can also be stabilized at a low level through the second resistor R2, making the second signal SCAN-KEY a low level signal.

[0077] In the embodiment of the utility model, the first diode, the second diode, the first resistor and the second resistor are combined to utilize the unidirectional conductivity of the diode when the function keys are pressed successively, so that the keys can output multiple currents and output two low-level signals for powering on and other functions.

[0078] Based on the above embodiments, Figure 2 As shown, the key signal output module 1 also includes a first filter capacitor C1 and a second filter capacitor C2. The first branch 11 is grounded through the first filter capacitor C1, that is, the cathode of the first diode in the first branch 11 is grounded through the first filter capacitor C1, and the second branch 12 is grounded through the second filter capacitor C2, that is, the cathode of the second diode in the second branch 12 is grounded through the second filter capacitor C2.

[0079] The introduction of the first filter capacitor and the second filter capacitor can filter the electrical signal in the key multi-output circuit to eliminate the existing jitter.

[0080] Based on the above embodiments, Figure 3 As shown, the key signal control module 2 also includes a trigger unit 22;

[0081] The trigger unit 22 is connected to the power pin V1 and the key power VCC-RTC respectively, and is used to trigger the switch unit 21 to turn off when receiving the power signal VCC.

[0082] Specifically, when the function key S1 is pressed, a low level signal is sent to the switch unit 21 through the first branch 11, the switch unit 21 is turned on, and a low level signal is sent to the NMI pin of the main control chip U1, and the electronic device where the main control chip U1 is located is turned on.

[0083] In order to prevent the function button S1 from continuing to send a low-level signal to the switch unit 21 through the first branch 11 when being pressed again, causing an abnormality in the electronic device, the trigger unit 22 can be used to trigger the switch unit 21 to shut down when receiving the power signal VCC. This can make the switch unit 21 of the electronic device where the main control chip U1 is located in a continuously turned-off state when the main control chip U1 is turned on, so that the first signal POWER-ON signal cannot be transmitted to the main control chip U1 through the switch unit 21, thereby avoiding the continuous output of a low-level signal to the main control chip U1.

[0084] Based on the above embodiments, Figure 4 As shown, the trigger unit 22 includes a first transistor Q2 ; the base of the first transistor Q2 is connected to the power pin V1 .

[0085] The collector of the first transistor Q2 is connected to the key power supply VCC-RTC and the switch unit 21 respectively.

[0086] The emitter of the first transistor Q2 is grounded.

[0087] Specifically, when the function key S1 is pressed, the electronic device where the main control chip U1 is located is turned on. The PMIC works, and the power signal VCC is provided through the power pin V1 of the main control chip U1. The first transistor Q2 is turned on, and the switch unit 21 is triggered to turn off, so that the first signal POWER-ON signal cannot be transmitted to the main control chip U1 through the switch unit 21, which can avoid continuously outputting a low-level signal to the main control chip U1.

[0088] Based on the above embodiments, Figure 4 As shown, the trigger unit 22 further includes a third resistor R3, a fourth resistor R4 and a fifth resistor R5;

[0089] The collector of the first transistor Q2 is connected to the key power supply VCC-RTC through the third resistor R3;

[0090] The base of the first transistor Q2 is connected to the power pin V1 through the fourth resistor R4 and is grounded through the fifth resistor R5.

[0091] Specifically, the existence of the third resistor R3 can pull up the collector of the first transistor Q2 to a high level when the power signal VCC is empty, and stabilize the collector of the first transistor Q2 at a low level when the power signal VCC exists.

[0092] The existence of the fourth resistor R4 can make the first transistor Q2 conductive when the power signal VCC exists. The existence of the fifth resistor R5 can make the base and collector of the first transistor Q2 grounded when the power signal VCC does not exist, and the first transistor Q2 is in a stable non-conductive state.

[0093] Based on the above embodiments, Figure 4 As shown, the trigger unit 22 also includes a sixth resistor R6;

[0094] The collector of the first transistor Q2 is connected to the switch unit 21 via the sixth resistor R6.

[0095] The existence of the sixth resistor R6 can cause static electricity to be generated between the first transistor Q2 and the switch unit 21, thereby affecting the key output effect.

[0096] Based on the above embodiments, Figure 4 As shown, the trigger unit 22 further includes a first capacitor C3; the base of the first transistor Q2 is grounded through the first capacitor C3.

[0097] The introduction of the first capacitor can isolate the base and emitter of the first transistor Q2.

[0098] Based on the above embodiments, Figure 5 As shown, the switch unit 21 includes a field effect transistor Q1 , and a drain D of the field effect transistor Q1 is connected to the NMI pin of the main control chip U1 .

[0099] The gate G of the field effect transistor Q1 is connected to the key power supply VCC-RTC through the sixth resistor R6 and the third resistor R3.

[0100] The source S of the field effect transistor Q1 is connected to the first end of the function key S1 and the key power supply VCC-RTC through the first branch 11 .

[0101] When the function key S1 is not pressed, the first signal POWER-ON is a high level signal, the source S and the gate G of the field effect transistor Q1 are both high level, the field effect transistor Q1 is turned off, and the switch unit 21 is turned off.

[0102] When the function key S1 is pressed, the first signal POWER-ON is a low level signal, the gate G of the field effect tube Q1 is high level, the field effect tube Q1 is turned on, the switch unit 21 is turned on, and the low level signal is transmitted to the NMI pin of the main control chip U1, and the electronic device where the main control chip U1 is located is turned on. The PMIC works and provides a power signal VCC through the power pin V1 of the main control chip U1.

[0103] At this time, the base of the first transistor Q2 in the trigger unit 22 is connected to the power signal VCC, the first transistor Q2 is turned on, the collector of the first transistor Q2 is at a low level, and then the gate G of the field effect transistor Q1 is at a low level, and the field effect transistor Q1 is turned off.

[0104] Based on the above embodiments, Figure 6 As shown, the switch unit 21 includes a second diode Q3, and the collector of the second diode Q3 is connected to the NMI pin of the main control chip U1.

[0105] The base of the second diode Q3 is connected to the key power supply VCC-RTC through the sixth resistor R6 and the third resistor R3.

[0106] The emitter of the second diode Q3 is connected to the first end of the function key S1 and the key power supply VCC-RTC through the first branch 11 .

[0107] When the function key S1 is not pressed, the first signal POWER-ON is a high level signal, the emitter and base of the second diode Q3 are both high level, the second diode Q3 is turned off, and the switch unit 21 is turned off.

[0108] When the function key S1 is pressed, the first signal POWER-ON is a low level signal, the base of the second diode Q3 is a high level, the second diode Q3 is turned on, the switch unit 21 is turned on, and the low level signal is transmitted to the NMI pin of the main control chip U1, and the electronic device where the main control chip U1 is located is turned on. The PMIC works and provides a power signal VCC through the power pin V1 of the main control chip U1.

[0109] At this time, the base of the first transistor Q2 in the trigger unit 22 is connected to the power signal VCC, the first transistor Q2 is turned on, the collector of the first transistor Q2 is at a low level, and then the base G of the second diode Q3 is at a low level, and the second diode Q3 is turned off.

[0110] like Figure 7 As shown, based on the above embodiments, an electronic device is further provided in the embodiments of the utility model, including the key multi-output circuit 71 provided in the above embodiments.

[0111] At this time, the key power supply VCC-RTC can be obtained by converting the power supply connected by the battery of the electronic device or the adapter, and the electronic device is equipped with a main control chip.

[0112] The electronic device may include intelligent learning devices such as a scanning pen and a dictionary pen, and may also include other miniaturized electronic devices with function keys.

[0113] The electronic device can realize two functions by using one function key when it is pressed due to the introduction of the key multi-output circuit 71. This can not only reduce the memory cost of the key functions when the user uses the electronic device, but also reduce the number of openings in the housing of the electronic device, reduce the impact of the number of openings on the appearance and quality of the electronic device, and improve the user experience. In addition, it can also reduce the limitation on the number of functions configured in the electronic device due to the size of the electronic device.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A key multi-output circuit, characterized in that: include: Function keys, key signal output module and key signal control module; The key signal output module includes a first branch and a second branch; The key signal control module includes a switch unit; The first end of the function key is respectively connected to the key power supply and the switch unit through the first branch, and is respectively connected to the power pin and the general input and output pin of the main control chip through the second branch, and the second end of the function key is grounded; The switch unit receives a low level signal and turns on when the function key is pressed; The switch unit is connected to the non-shielding interrupt pin of the main control chip. The main control chip is configured with a power management unit. The power management unit is used to be awakened when the non-shielding interrupt pin receives a low-level signal and provide a power signal through the power pin.

2. The key multi-output circuit according to claim 1, characterized in that: The first branch includes a first diode and a first resistor, and the second branch includes a second diode and a second resistor; The anode of the first diode is connected to the switch unit and connected to the key power supply through the first resistor, and the cathode of the first diode is connected to the first end of the function key; The anode of the second diode is connected to the general input / output pin and is connected to the power pin via the second resistor. The cathode of the second diode is connected to the first end of the function key.

3. The key multi-output circuit according to claim 1, characterized in that: The key signal control module also includes a trigger unit; The trigger unit is connected to the power pin and the key power supply respectively, and is used to trigger the switch unit to turn off when receiving the power signal.

4. The key multi-output circuit according to claim 3, characterized in that: The trigger unit includes a first triode; The base of the first transistor is connected to the power pin; The collector of the first transistor is connected to the key power supply and the switch unit respectively; The emitter of the first transistor is grounded.

5. The key multi-output circuit according to claim 4, characterized in that: The trigger unit further includes a third resistor, a fourth resistor and a fifth resistor; The collector of the first transistor is connected to the key power supply through the third resistor; The base of the first transistor is connected to the power pin through the fourth resistor and is grounded through the fifth resistor.

6. The key multi-output circuit according to claim 4, characterized in that: The trigger unit further includes a sixth resistor; The base of the first transistor is connected to the switch unit through the sixth resistor.

7. The key multi-output circuit according to claim 4, characterized in that: The trigger unit further includes a first capacitor; The collector of the first transistor is grounded through the first capacitor.

8. The key multi-output circuit according to claim 2, characterized in that: The first diode and the second diode are both Schottky diodes.

9. The key multi-output circuit according to any one of claims 1 to 8, characterized in that: The switch unit includes a field effect tube; The drain of the field effect tube is connected to the non-shielding interrupt pin; The gate of the field effect tube is connected to the key power supply; The source of the field effect tube is connected to the first end of the function key and the key power supply through the first branch.

10. The key multi-output circuit according to any one of claims 1 to 8, characterized in that: The switch unit includes a second triode; The collector of the second transistor is connected to the non-shielding interrupt pin; The base of the second transistor is connected to the key power supply; The emitter of the second transistor is connected to the first end of the function key and the key power supply through the first branch.

11. An electronic device, characterized in that: It comprises a key multi-output circuit as claimed in any one of claims 1-10.

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