CN209117826U - Key-press status detection circuit - Google Patents
Key-press status detection circuit Download PDFInfo
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- CN209117826U CN209117826U CN201821575728.7U CN201821575728U CN209117826U CN 209117826 U CN209117826 U CN 209117826U CN 201821575728 U CN201821575728 U CN 201821575728U CN 209117826 U CN209117826 U CN 209117826U
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Abstract
The utility model relates to a kind of key-press status detection circuits, including processor, current limliting module, division module and key module；Processor includes the port AD for collection voltages signal magnitude；One end of current limliting module connects the port AD, and the other end connects division module；First pin of key module connects division module, second pin ground connection.Pass through the size of the AD port processing voltage signal of processor, the voltage swing of AD port processing can be read in processor, according to the corresponding voltage swing read of the different conditions of key AD port voltage sizes that are different, and then reading by processor, the judgement to key-press status is realized.The embodiment of the present application can normal key range press and releasing orientation, be also capable of the state of key range failure；Whether when key breaks down, it is faulty to be quickly detected key, improves key-press status detection reliability.
Description
Technical field
The utility model technical field of key, more particularly to a kind of key-press status detection circuit.
Background technique
Key is a kind of electronic switch, mainly switches on and off electricity by the metal clips inside touch key to realize
Road is widely used in video and audio product, digital product, remote controler, communication product, household electrical appliance, security product, toy, computer and produces
The products such as product, fitness equipment, medical equipment and automobile.Currently, being pressed in existing key-press status detection circuit by that can only detect
Key press or releasing orientation, when key break down when, can not detect and identify.
During realization, inventor has found that at least there are the following problems in traditional technology: traditional key-press status detection
In circuit, it is difficult to detect key failure, it is low that key-press status detects reliability.
Utility model content
Based on this, it is necessary in traditional key-press status detection circuit, key-press status detects the low problem of reliability,
A kind of key-press status detection circuit is provided.
To achieve the goals above, the utility model embodiment provides a kind of key-press status detection circuit, including processing
Device, current limliting module, division module and key module；Processor includes the port AD for collection voltages signal magnitude；
One end of current limliting module connects the port AD, and the other end connects division module；The first pin connection point of key module
Die block, second pin ground connection.
Division module includes the first divider resistance of connection and the second divider resistance in one of the embodiments,；
The first end of first divider resistance connects power supply, second end be separately connected the second divider resistance first end,
First pin of current limliting module and key module；
The second end of second divider resistance is grounded.
Power supply is 5 volts of power supplies in one of the embodiments,.
Current limliting module is current-limiting resistance in one of the embodiments,.
It in one of the embodiments, further include the first protective resistance and the second protective resistance；
First protective resistance is connected between division module and the first pin of key module；One end of second protective resistance
Connect the second pin of key module, other end ground connection.
It in one of the embodiments, further include voltage-stabiliser tube；
First pin of the cathode connection key module of voltage-stabiliser tube, plus earth.
Voltage-stabiliser tube is 5 volts of voltage-stabiliser tubes in one of the embodiments,.
It in one of the embodiments, further include filter capacitor；
First pin of one end connection key module of filter capacitor, other end ground connection.
Processor is single-chip microcontroller, DSP or FPGA in one of the embodiments,.
Key module is button switch in one of the embodiments,.
A technical solution in above-mentioned technical proposal is had the following advantages and beneficial effects:
One end based on current limliting module connects the port AD, and the other end connects division module；First pin of key module connects
Connect division module, second pin ground connection.By the size of the AD port processing voltage signal of processor, the end AD is can be read in processor
The voltage swing of mouth acquisition, it is different according to the corresponding voltage swing read of the different conditions of key, and then pass through processor reading
AD port voltage size, realize judgement to key-press status.Specifically, due to key module it is normal unclamp, normally press,
When to states such as power supply short circuit failure, shorted to earth failure and key clamping stagnations, the collection voltages of the port AD are of different sizes, Jin Ergen
According to different size of voltage is read, the key-press status of key module is judged.The embodiment of the present application can be pressed normally key range
And releasing orientation, also it is capable of the state of key range failure；When key breaks down, it can be quickly detected whether key has
Failure improves key-press status detection reliability.
Detailed description of the invention
Fig. 1 is the first structure diagram of key-press status detection circuit in one embodiment；
Fig. 2 is the second structural schematic diagram of key-press status detection circuit in one embodiment；
Fig. 3 is the third structural schematic diagram of key-press status detection circuit in one embodiment；
Fig. 4 is the 4th structural schematic diagram of key-press status detection circuit in one embodiment.
Specific embodiment
The application in order to facilitate understanding is described more fully the application below with reference to relevant drawings.In attached drawing
Give the preferred embodiment of the application.But the application can realize in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is make it is more thorough and comprehensive to disclosure of this application.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term " and or " used herein includes one or more phases
Any and all combinations of the listed item of pass.
At present in circuit, the connection type of traditional microcontroller and key has following several: independent key, matrix are pressed
Key, AD analogue-key.Wherein, independent key realizes the mode of key detection are as follows: when key unclamps, the I/O pin of microcontroller
Power supply is pulled to by resistance or is pulled down to ground；When pressing key pressing, the I/O pin of microcontroller is connected to another state,
Thus judge key-press status.Matrix press-key realizes the mode of key detection are as follows: matrix press-key is pulled to power supply by ranks arrangement,
By first time setting row I/O pin be input and column I/O pin is output, and it is to export and arrange IO pipe that second, which is arranged row I/O pin,
Foot is input, reads I/O state twice and analyzes which key is pressed.AD analogue-key realizes the mode of key detection are as follows: AD
Analogue-key is when reading different key by AD pin to press, and different electric resistance partial pressures are different, and analyze which key quilt
It presses.The key connection method traditional for above-mentioned three kinds is able to achieve the state for identifying which key is pressed or unclamps, but
Be when key break down when, such as key to power supply occur short circuit, over the ground occur short circuit, can not but identify, reduce
The reliability of case detection.
And in various embodiments of the utility model, it can be handled by the size of the AD port processing voltage signal of processor
The voltage swing of AD port processing can be read in device, (normally unclamps, normally presses, to power supply short circuit according to the different conditions of key
The states such as failure, shorted to earth failure and key clamping stagnation) the corresponding voltage swing read is different, and then passes through what processor was read
AD port voltage size realizes the judgement to key-press status.And then when key breaks down, can be quickly detected key is
It is no faulty, improve key-press status detection reliability.
In one embodiment, as shown in Figure 1, providing a kind of key-press status detection circuit, including processor 110, limit
Flow module 120, division module 130 and key module 140；Processor 110 includes the AD for collection voltages signal magnitude
(Analog-Digital analog-to-digital) port；
One end of current limliting module 120 connects the port AD, and the other end connects division module 130；The first of key module 140 is drawn
Foot connects division module 130, second pin ground connection.
Wherein, processor 110 refers to the device with the functions such as signal processing and signal transmission.Processor 110 may be used also
Function comprising AD sampling.Optionally, processor 110 is single-chip microcontroller, DSP (Digital Signal Processer, number letter
Number processor) or FPGA (Field-Programmable Gate Array, field programmable gate array).Preferably, it handles
Device 110 is single-chip microcontroller.Current limliting module 120 refers to the module for being able to suppress circuit branch size of current.Current limliting module 120 can go here and there
It is coupled in circuit, to prevent electric current is excessive from burning out the concatenated device of institute.Division module 130 refers to that partial pressure can be played the role of,
By module of a part of voltage drop in division module 130.Key module 140 refers to a kind of electronic switch.Preferably, key
Module 140 is button switch.Key module 140 can realize the disconnection or conducting of switch by way of pressing.Processor 110
The port AD can be used to sample analog voltage signal, and the signal of sampling progress analog-to-digital conversion is obtained digital voltage letter
Number.
Specifically, the port AD of one end connection processor 110 based on current limliting module 120, the other end of current limliting module 120
Connect division module 130；First pin of key module 140 connects division module 130, and the second pin of key module 140 connects
Ground.For key module 140 under different conditions, the voltage swing of the port AD is different.Pass through the AD port processing voltage of processor 110
Signal reads the voltage signal size that AD port processing arrives by processor 110, and then can determine whether which key module 140 is in
Under a kind of state.For example, the voltage that processor 110 reads the port AD is first voltage under the normal releasing orientation of key module 140
Value；Under the normal down state of key module 140, the voltage that processor 110 reads the port AD is second voltage value；Key module
Under 140 pairs of power supply short circuit malfunctions, the voltage that processor 110 reads the port AD is third voltage value；Key module 140 is over the ground
Under short trouble state, the voltage that processor 110 reads the port AD is the 4th voltage value；Under 140 clamping stagnation state of key module, place
Managing device 110 and reading the voltage of the port AD is the 5th voltage value.Wherein, the first voltage value, second voltage value, third voltage value,
The size of four voltage values and the 5th voltage value difference is unequal.The voltage swing that the port AD is read by processor 110, can sentence
The state that disconnected key module is in realizes the comprehensive detection to key-press status.
In above-described embodiment, by the size of the AD port processing voltage signal of processor, the port AD is can be read in processor
The voltage swing of acquisition, it is different according to the corresponding voltage swing read of the different conditions of key, and then read by processor
AD port voltage size realizes the judgement to key-press status.Specifically, since key module is normally being unclamped, is normally being pressed, right
When the states such as power supply short circuit failure, shorted to earth failure and key clamping stagnation, the collection voltages of the port AD are of different sizes, and then basis
Different size of voltage is read, judges the key-press status of key module.The embodiment of the present application can normal key range press and
Releasing orientation is also capable of the state of key range failure；When key breaks down, it can be quickly detected whether key has event
Barrier improves key-press status detection reliability.
In one embodiment, as shown in Fig. 2, providing a kind of key-press status detection circuit, including processor 210, limit
Flow module, division module and key module 240.Wherein, division module includes the first divider resistance of connection 232 and the second partial pressure electricity
Resistance 234.
The first end of first divider resistance 232 is separately connected power supply, and second end connects the of the second divider resistance 234
One end, current limliting module and key module 240 the first pin；The second end of second divider resistance 234 is grounded.
Wherein, the first divider resistance 232 refers to play the role of that the resistance of partial pressure, the first divider resistance 232 can incite somebody to action
A part of voltage drop is on first divider resistance 232.Second divider resistance 234 refers to play the role of the electricity of partial pressure
Resistance, the second divider resistance 234 can be by a part of voltage drop on second divider resistance 234.Power supply is referred to for circuit
The power supply of work, power supply can be DC voltage source.Preferably, power supply is 5 volts of power supplies.
Specifically, the first end based on the first divider resistance 232 is separately connected power supply, the first divider resistance 232
Second end connects the first pin of the first end of the second divider resistance 234, current limliting module and key module 240；Second partial pressure electricity
The second end ground connection of resistance 234.For key module 240 under different conditions, the voltage swing of the port AD is different.Pass through processor 210
AD port processing voltage signal, the voltage signal size that arrives of AD port processing is read by processor 210, so can determine whether by
Key module 240 is under any state.
In a specific embodiment, current limliting module is current-limiting resistance 220.Current-limiting resistance 220 refers to being able to suppress
The resistance of circuit branch size of current.Current-limiting resistance 220 can be series in circuit, to prevent electric current is excessive from burning out concatenated place, institute
Manage the port AD of device.The port AD of one end connection processor 210 based on current-limiting resistance 220, the other end of current-limiting resistance 220 connect
Connect division module；First pin of key module 240 connects division module, the second pin ground connection of key module 240.In key
Module 240 be in different conditions (normal releasing orientation, normal down state, to power supply short circuit malfunction, shorted to earth failure
State and key clamping stagnation state etc.) when, the voltage swing that processor 210 reads the port AD is different.It is read according to processor 210
AD port voltage size, the and then it can be seen that state that key module 240 is in, realizes the detection to key-press status, improve by
Bonded state detects reliability.
It in one embodiment, further include the first protection electricity as shown in Fig. 2, providing a kind of key-press status detection circuit
Resistance 252 and the second protective resistance 254.
First protective resistance 252 is connected between division module and the first pin of key module 240；Second protective resistance
The second pin of 254 one end connection key module 240, other end ground connection.
Wherein, the first protective resistance 252 can be used to protect electricity when the first pin of key module 240 is to power supply short circuit
Road.Second protective resistance 254 can be used to protect circuit when the second pin of key module 240 is to power supply short circuit.
Specifically, one end based on the first protective resistance 252 connects division module, the other end of the first protective resistance 252
Connect the first pin of key module 240；The second pin of one end connection key module of second protective resistance 254, second protects
Protect the other end ground connection of resistance 254.When key module 240 occurs to power supply short circuit failure, i.e., the first of key module 240 is drawn
Foot to the second pin of power supply short circuit or key module 240 to power supply short circuit when, prevent key module 240 from making to power supply short circuit
Pairs of circuit is burnt out, and plays the role of protecting circuit.
In one embodiment, as shown in figure 3, providing a kind of key-press status detection circuit, including processor, current limliting mould
Block, division module and key module；It further include voltage-stabiliser tube 360.
First pin of the cathode connection key module 340 of voltage-stabiliser tube 360, plus earth.
Wherein, voltage-stabiliser tube 360 can be zener diode, and voltage-stabiliser tube 360 can be used to the first pin in key module 340
Or the second pin of key module 340 to power supply occur short trouble when, protect processor 310 the port AD, prevent processor
Pin be burned.Preferably, voltage-stabiliser tube 360 is 5 volts of voltage-stabiliser tubes.
Specifically, the first pin of the cathode connection key module 340 based on voltage-stabiliser tube 360, the anode of voltage-stabiliser tube 360 connect
Ground.When to power supply short trouble occurs for the second pin of the first pin of key module 340 or key module 340, by steady
Pressure pipe 360 can protect the port AD of processor 310 to prevent from being burned.For example, in the circuit designs such as automobile, due to external power supply
Generally 12V power supply, when the first pin of key module 340 or the second pin of key module 340 are short to the generation of 12V power supply line
When the failure of road, which can play the role of protecting processor pin.
It in a specific embodiment, further include filtering as shown in figure 3, providing a kind of key-press status detection circuit
Capacitor 370.First pin of one end connection key module 340 of filter capacitor 370, other end ground connection.
Wherein, filter capacitor 370 can be used to filter out the noise signal for including in voltage signal.Filter capacitor 370 can be with
It is ceramic condenser.
Specifically, based on filter capacitor 370 one end connection key module 340 the first pin, filter capacitor 370 it is another
One end ground connection.The effect of signal noise is filtered out by filter capacitor 370, so that processor can more accurately read the electricity of the port AD
Size is pressed, the accuracy of key-press status detection is improved.
In above-described embodiment, by the size of the AD port processing voltage signal of processor, the port AD is can be read in processor
The voltage swing of acquisition, it is different according to the corresponding voltage swing read of the different conditions of key, and then read by processor
AD port voltage size realizes the judgement to key-press status.Pass through key range malfunction, when key breaks down, energy
Enough quickly positioning exclude whether key is faulty, and reduction maintenance time improves working efficiency.
In one embodiment, as shown in figure 4, providing a kind of key-press status detection circuit.Including processor 410, limit
It is leakage resistance 420, the first divider resistance 432, the second divider resistance 434, the first protective resistance 452, the second protective resistance 454, steady
Pressure pipe 460, filter capacitor 470 and key module 440.The first end of the port the AD connection current-limiting resistance 420 of processor 410, limit
The second end of leakage resistance 420 is separately connected the second end of the first divider resistance 432, the first end of the second divider resistance 434, filtering
One end of capacitor 470, the cathode of voltage-stabiliser tube 460 and the first protective resistance 452 one end；The first end of first divider resistance 432
Connect power supply；The second end of second divider resistance 434 is grounded；The other end of filter capacitor 470 is grounded；Voltage-stabiliser tube 460
Plus earth；First pin of the other end connection key module 440 of the first protective resistance 452；The second of key module 440 is drawn
Foot connects one end of the second protective resistance 454, the other end ground connection of the second protective resistance 454.
In order to more specifically illustrate the working principle of key-press status detection circuit, taking current-limiting resistance 420 is the (Europe 10K Ω
Nurse) current-limiting resistance, the first divider resistance 432 be 10K Ω divider resistance, the second divider resistance 434 be 20K Ω partial pressure electricity
Resistance, power supply are positive the power supply of 5V (volt), filter capacitor of the filter capacitor 470 for 0.1 μ F (microfarad), voltage-stabiliser tube 460
For the voltage-stabiliser tube of 5V, the first protective resistance 452 is the protective resistance of 1K Ω, the protection electricity that the second protective resistance 454 is 5.8K Ω
Resistance.
When the key of key module normally unclamps, it is (5V/ (10K Ω+20K that processor 410, which reads AD port voltage,
Ω)) × 20K Ω=3.33V；
When the key of key module is normally pressed, it is (5V/ (10K Ω+5.07K that processor 410, which reads AD port voltage,
Ω)) × 5.07K Ω=1.68V；
When the key of key module 440 is to power supply short circuit failure, i.e., the first pin of key module 440 is to power supply short circuit
And by the second pin of key pressing or key module 440 to power supply short circuit and when pressing key pressing, processor 410 reads the port AD
Voltage is 5V；
When there is shorted to earth failure in the key of key module 440, i.e. the first pin shorted to earth of key module 440
And by the second pin shorted to earth of key pressing or key module 440 and when pressing key pressing, processor 410 reads the port AD electricity
Pressure is (5V/ (10K Ω+0.95K Ω)) × 0.95K Ω=0.43V；
It when the key clamping stagnation of key module 440, i.e., can not be automatically springed open by after key pressing, processor 410 reads the end AD
Mouth voltage is (5V/ (10K Ω+5.07K Ω)) × 5.07K Ω=1.68V；It can be counted by counter, which continues
More than after a certain period of time, it is believed that Block failure occurs in key.
Based on the present embodiment, for the first divider resistance, the second divider resistance, the first protective resistance and the second protective resistance
Resistance value design, meet to key module in power supply short circuit state, releasing orientation, down state and shorted to earth state, place
Reason device reads AD port voltage and is followed successively by 5V, 3.33V, 1.68V and 0.43V.That is 5V-3.3V ≈ 3.33-1.68V ≈ 1.68-
0.43V, to avoid between different conditions, the voltage difference of reading is too small to be caused to be not easy to differentiate.It can be just by the embodiment of the present application
Normal key range is pressed and releasing orientation, is also capable of the state of key range failure；When key breaks down, can quickly examine
It whether faulty measures key, improves key-press status detection reliability.
It should be noted that for device (current-limiting resistance, the first divider resistance, the second divider resistance, the first protection electricity
Resistance, the second protective resistance, voltage-stabiliser tube and filter capacitor) value, value one of is not limited to the above embodiments, in other realities
It applies in example, the device of other values also can be used.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to utility model patent range therefore cannot be interpreted as.It should be pointed out that for the ordinary skill people of this field
For member, without departing from the concept of this application, various modifications and improvements can be made, these belong to the application's
Protection scope.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. a kind of key-press status detection circuit, which is characterized in that including processor, current limliting module, division module and key module；
The processor includes the port AD for collection voltages signal magnitude；
One end of the current limliting module connects the port AD, and the other end connects the division module；The of the key module
One pin connects the division module, second pin ground connection.
2. key-press status detection circuit according to claim 1, which is characterized in that the division module includes connection first
Divider resistance and the second divider resistance；
The first end of first divider resistance connects power supply, and second end is separately connected the first of second divider resistance
It holds, the first pin of the current limliting module and the key module；
The second end of second divider resistance is grounded.
3. key-press status detection circuit according to claim 2, which is characterized in that the power supply is 5 volts of power supply electricity
Source.
4. key-press status detection circuit according to claim 1, which is characterized in that the current limliting module is current-limiting resistance.
5. key-press status detection circuit according to claim 1, which is characterized in that further include the first protective resistance and second
Protective resistance；
First protective resistance is connected between the division module and the first pin of the key module；Described second protects
One end of shield resistance connects the second pin of the key module, other end ground connection.
6. key-press status detection circuit according to claim 1, which is characterized in that further include voltage-stabiliser tube；
The cathode of the voltage-stabiliser tube connects the first pin of the key module, plus earth.
7. key-press status detection circuit according to claim 6, which is characterized in that the voltage-stabiliser tube is 5 volts of voltage-stabiliser tubes.
8. according to claim 1 to key-press status detection circuit described in 7 any one, which is characterized in that further include filtered electrical
Hold；
One end of the filter capacitor connects the first pin of the key module, other end ground connection.
9. key-press status detection circuit according to claim 8, which is characterized in that the processor be single-chip microcontroller, DSP or
FPGA。
10. key-press status detection circuit according to claim 8, which is characterized in that the key module is button switch.
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| CN111025956A (en) * | 2019-10-30 | 2020-04-17 | 九阳股份有限公司 | Food preparation machine's button identification circuit |
| CN111338263A (en) * | 2020-03-23 | 2020-06-26 | 江铃汽车股份有限公司 | Low-cost key circuit with hardware logic |
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| CN111726119A (en) * | 2020-06-30 | 2020-09-29 | 京东方科技集团股份有限公司 | Key detection circuit and detection method |
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| CN110673013B (en) * | 2019-09-02 | 2022-05-24 | 武汉光庭科技有限公司 | Automatic detection method and device for switch and switch circuit |
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| CN111025956A (en) * | 2019-10-30 | 2020-04-17 | 九阳股份有限公司 | Food preparation machine's button identification circuit |
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| CN113325335A (en) * | 2021-08-04 | 2021-08-31 | 南昌龙旗信息技术有限公司 | Circuit failure detection circuit and method and intelligent electronic equipment |
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| CN117250495A (en) * | 2023-11-16 | 2023-12-19 | 广州三晶电气股份有限公司 | Key adhesion detection device |
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