CN210958339U - Digital combined key circuit - Google Patents
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- CN210958339U CN210958339U CN202020203068.0U CN202020203068U CN210958339U CN 210958339 U CN210958339 U CN 210958339U CN 202020203068 U CN202020203068 U CN 202020203068U CN 210958339 U CN210958339 U CN 210958339U
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Abstract
The application provides a digit type combination key circuit, this circuit structure includes: the key module comprises a plurality of key modules, a plurality of control modules and a plurality of control modules, wherein each key module is used for generating a level signal according to an external trigger signal or corresponding key operation; the key signal processing module is respectively connected with the plurality of key modules and used for acquiring each level signal and converting the level signal into a digital key signal; and the main control chip is connected with the key signal processing module and used for acquiring the digital key signal and controlling corresponding execution equipment to execute corresponding operation according to the digital key signal. According to the key signal processing module, the key module and the execution device are connected through the key signal processing module, the pin requirement for the main control chip is reduced compared with the prior art, and meanwhile, the main control chip can acquire various different types of key signals through the key signal processing module through improvement on the key module.
Description
Technical Field
The application relates to the field of key circuits, in particular to a digital combined key circuit.
Background
The key serves as a basic electronic component and plays a very key role in the aspect of man-machine interaction of electronic products.
The main control chip in the conventional key circuit, for example, a Micro Controller Unit (MCU), directly connects the key module and the execution device, and this connection mode has a certain requirement on the pin number of the MCU, especially under the condition that there are a plurality of key modules and the execution device needs a plurality of working pins, this connection mode needs the MCU to have a larger number of working pins, and the MCU with more pins has a higher cost. This not only increases the cost of the system, but also increases the complexity of the overall system.
In view of the above problems, no effective technical solution is available at present.
SUMMERY OF THE UTILITY MODEL
An object of the embodiments of the present application is to provide a digital combination key circuit, which is used to reduce the requirement of key circuit system for the pin number of the main control chip, and at the same time, the main control chip can conveniently collect various key signals.
The embodiment of the application provides a digital combined key circuit, which comprises:
the key module comprises a plurality of key modules, a plurality of control modules and a plurality of control modules, wherein each key module is used for generating a level signal according to an external trigger signal or corresponding key operation;
the key signal processing module is respectively connected with the plurality of key modules and is used for acquiring each level signal and converting the level signal into a digital key signal;
and the main control chip is connected with the key signal processing module and used for acquiring the digital key signal and controlling corresponding execution equipment to execute corresponding operation according to the digital key signal.
Optionally, in the digital combination key circuit according to the embodiment of the present application, the main control chip has an output port, the output port is directly connected to the execution device, and the main control chip is configured to generate a corresponding driving signal according to the digital key signal, and output the driving signal to the execution device to drive the execution device to execute a corresponding operation.
Optionally, in the digital combination key circuit according to this embodiment of the present application, the main control chip has an output port, the output port is connected to the key signal processing module, and the key signal processing module is connected to the execution device;
the main control chip is used for generating a corresponding execution signal according to the digital key signal and sending the execution signal to the key signal processing module, and the key signal processing module generates a driving signal according to the execution signal and outputs the driving signal to the execution equipment so as to drive the execution equipment to execute corresponding operation.
The plurality of key modules and the execution equipment can not be connected with the main control chip, the main control chip indirectly acquires key information through the key signal processing module and can indirectly control the execution equipment, the requirement on the number of working pins of the main control chip is reduced, and the cost of the main control chip and the complexity of a system are reduced.
Optionally, in the digital combination key circuit according to the embodiment of the present application, the plurality of key modules include at least two of the following: the key comprises an entity key module, a logic switching value key module and an analog voltage switching value key module.
Optionally, in the digital combination key circuit according to this embodiment of the present application, the entity key module includes a first power interface, a first diode, an entity key, and a first output interface;
the first power interface, the first diode, the entity key and the first output interface are connected in sequence.
Optionally, in the digital combination key circuit according to the embodiment of the present application, the entity key module further includes a first capacitor for eliminating interference, and two ends of the first capacitor are respectively connected to two ends of the entity key.
Optionally, in the digital combination key circuit according to this embodiment of the present application, the logic switching value key module includes a first input interface, a first resistor, a second power interface, a first transistor, a second diode, and a second output interface;
the first input interface, the first resistor and the control end of the first transistor are sequentially connected, the second power interface is connected with the power end of the first transistor, the output end of the first transistor, the second diode and the second output interface are sequentially connected, and the first resistor, the control end of the first transistor and the second resistor are connected to a common node.
Optionally, in the digital combination key circuit according to this embodiment of the present application, the analog voltage switching value key module includes a second input interface, a third input interface, a voltage comparator, a third resistor, a third power interface, a second transistor, a third diode, and a third output interface;
the third input interface is connected with the reverse input end of the voltage comparator, the second input interface is connected with the forward input end of the voltage comparator, the output end of the voltage comparator, the third resistor and the control end of the second transistor are sequentially connected, the third power supply interface is connected with the power supply end of the second transistor, the output end of the second transistor is connected with the third diode, and the third diode is connected with the third output interface.
Optionally, in the digital combination key circuit according to the embodiment of the present application, the analog voltage switching value key module further includes a fourth resistor, a fifth resistor, and a second capacitor;
the second input interface, the positive input end of the voltage comparator and the fourth resistor are connected to a common node, the output end of the voltage comparator, the third resistor and the fifth resistor are connected to a common node, and the third resistor, the control end of the second transistor and the second capacitor are connected to a common node.
Optionally, in the digital combination key circuit according to this embodiment of the present application, the analog voltage switching value key module further includes a fourth power interface, a sixth resistor, a seventh resistor, a ground terminal, and a third input interface;
the fourth power interface, the sixth resistor, the seventh resistor and the ground terminal are connected in sequence, and the sixth resistor, the seventh resistor and the third input interface are connected to a common node.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a system block diagram of a digital combination key circuit according to an embodiment of the present disclosure;
fig. 2 is a circuit diagram of an entity key module of a plurality of key modules of the digital combination key circuit according to an embodiment of the present application;
fig. 3 is a circuit diagram of a logic on-off value key module of multiple key modules of the digital combination key circuit according to the embodiment of the present application;
fig. 4 is a circuit diagram of an analog voltage switching value key module of multiple key modules of the digital combination key circuit according to the embodiment of the present application.
Icon: 10-a plurality of key modules; 20-key signal processing module; 30-a main control chip; 11-a physical key module; 111-a first power interface; 112-physical key; 113-a first output interface; 12-logic switching value key module; 121-a first input interface; 122-a second power interface; 123-a second output interface; 13-analog voltage switching value key module; 131-a second input interface; 132-a third input interface; 133-voltage comparator; 134-a third power interface; 135-a third output interface; 136-a fourth power interface; 137-ground terminal.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Fig. 1 is a schematic block diagram of a digital combination key circuit provided in an embodiment of the present application, where the digital combination key circuit includes a plurality of key modules 10, a key signal processing module 20, and a main control chip 30. The plurality of key modules 10 are respectively connected to the key signal processing module 20, and the key signal processing module 20 is connected to the main control chip 30.
Each key module is used for generating a level signal according to an external trigger signal or corresponding key operation; the key signal processing module 20 acquires each level signal, converts the level signal into a digital key signal and stores the digital key signal in a memory thereof; the main control chip 30 obtains the digital key signal through a communication pin between the main control chip and the key signal processing module 20, and controls a corresponding execution device to execute a corresponding operation according to the digital key signal. For example, in this application example, after the main control chip 30 obtains the key signal, the main control chip 30 may indirectly control the nixie tube module through the key signal processing module 20, so that the nixie tube module displays corresponding content according to a set program.
Each of the plurality of key modules 10 is configured to generate a level signal according to an external trigger signal or a corresponding key operation. The external trigger signal may be a voltage signal output by other chips or a voltage signal output by other circuit modules.
The plurality of key modules 10 may be: an entity key module 11, a logic switching value key module 12 and an analog voltage switching value key module 13. The entity key module 11 is used for generating and outputting a level signal according to key operation; the logic switching value key module 12 is used for generating and outputting a level signal according to an externally input logic voltage signal; the analog voltage switching value key module 13 is configured to generate and output a level signal according to an externally input analog voltage signal, and is suitable for a customized reference voltage.
In some embodiments, there are different types of key modules in the plurality of key modules 10, for example, the plurality of key modules 10 may be one physical key module 11 and two logic switching value key modules 12, two physical key modules 11 and one analog voltage switching value key module 13, two logic switching value key modules 12 and two analog voltage switching value key modules 13, and so on. In other embodiments, the plurality of key modules 10 may be a plurality of key modules of the same type, such as a plurality of physical key modules 11, a plurality of logical switching value key modules 12, or a plurality of analog voltage switching value key modules 13.
It should be understood that the plurality of key modules 10 shown in fig. 1 are composed of a physical key module 11, a logical switching value key module 12, and an analog voltage switching value key module 13, which are merely examples and should not be construed as limitations of the present application.
In the above scheme provided in the embodiment of the present application, the plurality of key modules 10 and the execution device may be connected to the key signal processing module 20, and the main control chip 30 indirectly controls the execution device through the key signal processing module 20. The main control chip 30 only needs to be connected with the key signal processing module 20 for communication, so that the requirement for the number of working pins of the main control chip 30 is greatly reduced, and the problems of more working pins, high system complexity and high cost of the main control chip 30 in the traditional scheme are solved. In addition, if there are key modules of different types in the plurality of key modules 10, the key signal processing module 20 can still obtain the key signals thereof, and convert the acquired level key signals into digital key signals, so as to implement single and combined digital acquisition of multiple types of keys, thereby solving the problems that in the conventional mode, the key signal acquisition difficulty of the main control chip 30 is high under the condition that the key signals are of various types, and the cost of the main control chip 30 is high due to the fact that a plurality of pins are required to connect the plurality of key modules 10.
Further, referring to fig. 2, the physical key module 11 includes a first power interface 111, a first diode D1, a physical key 112, and a first output interface 113; the first power interface 111, the first diode D1, the physical key 112, and the first output interface 113 are connected in sequence.
In some embodiments, the physical key module 11 further includes a first capacitor C1, two ends of the first capacitor C1 are respectively connected to two ends of the physical key 112; the first capacitor C1 is used for reducing interference and improving the working stability of the entity key module.
When the physical key 112 is pressed, the physical key module 11 is turned on and outputs a high level signal to the outside; the first diode D1 makes the physical key module 11 conduct in one direction, and will not short circuit when the key module performs key combination.
Further, referring to fig. 3, the logic switching value key module 12 includes a first input interface 121, a first resistor R1, a second resistor R2, a second power interface 122, a first transistor T1, a second diode D2, and a second output interface 123; the first input interface 121, the first resistor R1 and the control terminal of the first transistor T1 are sequentially connected, the second power interface 122 and the power terminal of the first transistor T1 are sequentially connected, the output terminal of the first transistor T1, the second diode D2 and the second output interface 123 are sequentially connected, and the second resistor R2, the control terminal of the first transistor T1 and the first resistor R1 are connected to a common node.
When the external trigger signal of the first input interface 121 is at a high level, the first transistor T1 is turned on, which is equivalent to pressing the physical key 112, and the logic on-off key module 12 is turned on and outputs a high level signal; otherwise, the logic switching value key module 12 is turned off and outputs a low level signal.
The first resistor R1 is used for limiting the current of the key module, and the second resistor R2 is used for improving the stability of the transistor operation.
The logic switching value key module 12 achieves the purpose of using the logic level as the key signal by replacing the physical key 112 with the first transistor T1.
Further, referring to fig. 4, the analog voltage switching value key module 13 includes a second input interface 131, a third input interface 132, a voltage comparator 133, a third resistor R3, a third power interface 134, a second transistor T2, a third diode D3, and a third output interface 135; the analog voltage switching value key module 13 converts the analog voltage into a logic voltage by using the voltage comparator 133, and is suitable for the customized voltage switching value.
Specifically, the third input interface 132 is connected to the inverting input terminal of the voltage comparator 133, the second input interface 131 is connected to the non-inverting input terminal of the voltage comparator 133, the output terminal of the voltage comparator 133, the third resistor R3 and the control terminal of the second transistor T2 are sequentially connected, the third power source interface 134 and the power source terminals of the second transistor T2 are sequentially connected, and the output terminal of the second transistor T2, the third diode D3 and the third output interface 135 are sequentially connected. The third input interface 132 inputs a self-defined reference voltage signal into the inverting input terminal of the voltage comparator 133, the external trigger signal is input into the non-inverting input terminal of the voltage comparator 133 through the second input interface 131, and through comparison of the voltage comparator 133, if the external trigger signal is higher than the self-defined reference voltage, the output terminal of the voltage comparator 133 outputs a high level signal to the control terminal of the second transistor T2, otherwise, a low level signal is output; when the control terminal of the second transistor T2 receives the high level signal, the second transistor T2 is turned on, which is equivalent to pressing the physical key 112, and the analog voltage switching value key module 13 is turned on and outputs the high level signal through the third output interface 135; otherwise, a low level signal is output outwards.
In some embodiments, the analog voltage switching value key module 13 further includes a fourth resistor R4, a fifth resistor R5, and a second capacitor C2; the second input interface 131, the non-inverting input terminal of the voltage comparator 133, and the fourth resistor R4 are connected to a common node, the output terminal of the voltage comparator 133, the third resistor R3, and the fifth resistor R5 are connected to a common node, and the third resistor R3, the control terminal of the second transistor T2, and the second capacitor C2 are connected to a common node.
In the embodiment of the present invention, the fourth resistor R4 is used to keep the second input interface 131 at a low level when there is no input signal, so as to improve stability, the fifth resistor R5 is used to improve the output capability of the voltage comparator, and the second capacitor C2 is used to improve the stability of turning on and off the second transistor.
In some embodiments, the analog voltage switching value key module 13 further includes a fourth power interface 136, a sixth resistor R6, a seventh resistor R7, and a ground terminal 137; the fourth power interface 136, the sixth resistor R6, the seventh resistor R7, and the ground terminal 137 are connected in sequence, and the sixth resistor R6, the seventh resistor R7, and the third input interface 132 are connected to a common node.
In the embodiment of the present application, the fourth power interface 136, the sixth resistor R6, the seventh resistor R7, and the ground terminal 137 are sequentially connected to form a path, and the voltage value of the common node connected to the third input interface 132 can be adjusted by adjusting the ratio of the sixth resistor R6 to the seventh resistor R7, so as to achieve the purpose of the customized reference voltage.
The key signal processing module 20 is connected to the plurality of key modules 10, respectively, for obtaining each of the level signals and converting the level signals into digital key signals.
In some embodiments, the key signal processing module 20 employs a chip, and the chip is used for collecting key signals and driving a nixie tube. The chip converts the acquired key level signal into a digital key signal and stores the digital key signal in a key signal storage of the chip, and when the chip receives a key digital signal reading instruction from the main control chip 30, the chip transmits the stored key digital signal to the main control chip; when the chip receives the execution signal from the main control chip 30, the chip outputs a corresponding driving signal to the execution device according to the received execution signal, so as to drive the execution device to execute a corresponding operation.
The main control chip 30 is connected to the key signal processing module 20, and is configured to obtain a digital key signal and control a corresponding execution device to execute a corresponding operation according to the digital key signal.
The main control chip 30 has an output port for outputting a corresponding execution signal generated by the main control chip 30 according to the digital key signal.
In some embodiments, the output port of the main control chip 30 is directly connected to the execution device, and the main control chip 30 is configured to generate a corresponding driving signal according to the numeric key signal and output the driving signal to the execution device to drive the execution device to execute a corresponding operation.
In some embodiments, the output port of the main control chip 30 is connected to the key signal processing module 20, and the key signal processing module 20 is connected to an execution device; the main control chip 30 is configured to generate a corresponding execution signal according to the digital key signal, and send the execution signal to the key signal processing module 20, and the key signal processing module 20 outputs a driving signal to an execution device according to the execution signal to drive the execution device to execute a corresponding operation.
In some embodiments, the main control chip employs an MCU.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A numeric combination keypad circuit, comprising:
the key module comprises a plurality of key modules, a plurality of control modules and a plurality of control modules, wherein each key module is used for generating a level signal according to an external trigger signal or corresponding key operation;
the key signal processing module is respectively connected with the plurality of key modules and is used for acquiring each level signal and converting the level signal into a digital key signal;
and the main control chip is connected with the key signal processing module and used for acquiring the digital key signal and controlling corresponding execution equipment to execute corresponding operation according to the digital key signal.
2. The digital combination key circuit of claim 1, wherein the main control chip has an output port, the output port is directly connected to an execution device, and the main control chip is configured to generate a corresponding driving signal according to the digital key signal and output the driving signal to the execution device to drive the execution device to execute a corresponding operation.
3. The digital combined key circuit according to claim 1, wherein the main control chip has an output port, the output port is connected to the key signal processing module, and the key signal processing module is connected to the execution device;
the main control chip is used for generating a corresponding execution signal according to the digital key signal and sending the execution signal to the key signal processing module, and the key signal processing module generates a driving signal according to the execution signal and outputs the driving signal to the execution equipment so as to drive the execution equipment to execute corresponding operation.
4. The digital combination key circuit of claim 1, wherein the plurality of key modules comprises at least two of: the key comprises an entity key module, a logic switching value key module and an analog voltage switching value key module.
5. The digital combination key circuit of claim 4, wherein the physical key module comprises a first power interface, a first diode, a physical key, a first output interface;
the first power interface, the first diode, the entity key and the first output interface are connected in sequence.
6. The digital combination key circuit of claim 5, wherein the physical key module further comprises a first capacitor for eliminating interference, and two ends of the first capacitor are respectively connected to two ends of the physical key.
7. The digital combined key circuit according to claim 4, wherein the logic switching value key module comprises a first input interface, a first resistor, a second power interface, a first transistor, a second diode, and a second output interface;
the first input interface, the first resistor and the control end of the first transistor are sequentially connected, the second power interface is connected with the power end of the first transistor, the output end of the first transistor, the second diode and the second output interface are sequentially connected, and the first resistor, the control end of the first transistor and the second resistor are connected to a common node.
8. The digital combined key circuit according to claim 4, wherein the analog voltage switching value key module comprises a second input interface, a third input interface, a voltage comparator, a third resistor, a third power interface, a second transistor, a third diode, and a third output interface;
the third input interface is connected with the reverse input end of the voltage comparator, the second input interface is connected with the forward input end of the voltage comparator, the output end of the voltage comparator, the third resistor and the control end of the second transistor are sequentially connected, the third power supply interface is connected with the power supply end of the second transistor, the output end of the second transistor is connected with the third diode, and the third diode is connected with the third output interface.
9. The digital combined key circuit according to claim 8, wherein the analog voltage switching value key module further comprises a fourth resistor, a fifth resistor, a second capacitor;
the second input interface, the positive input end of the voltage comparator and the fourth resistor are connected to a common node, the output end of the voltage comparator, the third resistor and the fifth resistor are connected to a common node, and the third resistor, the control end of the second transistor and the second capacitor are connected to a common node.
10. The digital combined key circuit according to claim 8, wherein the analog voltage switching value key module further comprises a fourth power interface, a sixth resistor, a seventh resistor, a ground terminal, and a third input interface;
the fourth power interface, the sixth resistor, the seventh resistor and the ground terminal are connected in sequence, and the sixth resistor, the seventh resistor and the third input interface are connected to a common node.
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| CN202020203068.0U CN210958339U (en) | 2020-02-24 | 2020-02-24 | Digital combined key circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111193517A (en) * | 2020-02-24 | 2020-05-22 | 苏州贝昂科技有限公司 | Digital combined key circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111193517A (en) * | 2020-02-24 | 2020-05-22 | 苏州贝昂科技有限公司 | Digital combined key circuit |
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Address after: Building 1, 175 Songbei Road, Suzhou Industrial Park, Jiangsu Province, 215000 Patentee after: Suzhou Beiang Intelligent Technology Co.,Ltd. Address before: No. 188, Xincheng Road, Suzhou Industrial Park, Suzhou City, Jiangsu Province, 215000 Patentee before: SUZHOU BEIANG TECHNOLOGY Ltd. |