CN109302188A - A kind of detection method and circuit of the line control push-button of electric resistance partial pressure type - Google Patents
A kind of detection method and circuit of the line control push-button of electric resistance partial pressure type Download PDFInfo
- Publication number
- CN109302188A CN109302188A CN201710609990.2A CN201710609990A CN109302188A CN 109302188 A CN109302188 A CN 109302188A CN 201710609990 A CN201710609990 A CN 201710609990A CN 109302188 A CN109302188 A CN 109302188A
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- Prior art keywords
- circuit
- button
- charging
- partial pressure
- line control
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M11/00—Coding in connection with keyboards or like devices, i.e. coding of the position of operated keys
- H03M11/20—Dynamic coding, i.e. by key scanning
Abstract
The present invention relates to key detection field, the particularly a kind of detection method and circuit of the line control push-button of electric resistance partial pressure type.The invention discloses a kind of detection method of the line control push-button of electric resistance partial pressure type and circuits, wherein detection method includes the following steps: S1, gives power supply to capacitor charging after the circuit of line control push-button partial pressure；S2, detection capacitor fully charged charging time；S3, according to the charging time detected it can be learnt that the corresponding key being pressed.The present invention can be suitably used for the electric resistance partial pressure type line control push-button circuit of different circuit structures, suitable for different MCU platforms and different power-supply systems, save development cost, shorten the development cycle that exploitation is matched with depot, and circuit structure is simple, it is easily achieved, has ADC function without the MCU inside the detection of special modulus conversion chip or detection device, it is at low cost.
Description
Technical field
The invention belongs to key detection field, detection method more particularly to a kind of line control push-button of electric resistance partial pressure type and
Circuit.
Background technique
Current more steering wheel for vehicle is integrated with line control push-button combination, and the differentiation of these key combinations is generally using resistance point
Pressure type, when pressing such as different key, which provides different resistance values, and then it is defeated to be converted into different voltage values
Out, to distinguish key.Which kind of, regardless of the electric resistance partial pressure of structure, require to detect or detect using special modulus conversion chip
MCU inside equipment has ADC function.If will increase cost using the detection of special modulus conversion chip；Using
Can be limited by the electric property of pin if MCU included ADC Function detection, for example, ADC functional pin supply voltage have 1.2V,
1.8V and 3.3V, the voltage range for causing ADC pin that can detect are different.And when line control push-button number is more, low-voltage
Its detection of the ADC pin of power supply just has certain requirement to the resistance combination of electric resistance partial pressure type key.And the group of these resistance
Conjunction mode all cannot be changed arbitrarily by what depot had had determined, this is existing for vehicle electronic device supplier
Equipment platform may not necessarily be able to satisfy detection demand, need development equipment platform again, extend the development cycle, increase exploitation
Cost.
Summary of the invention
The purpose of the present invention is to provide a kind of detection methods of the line control push-button of electric resistance partial pressure type and circuit to solve
The above problem.
To achieve the above object, a kind of the technical solution adopted by the present invention are as follows: detection of the line control push-button of electric resistance partial pressure type
Method includes the following steps:
S1 gives power supply to capacitor charging after the circuit of line control push-button partial pressure；
S2, the charging time that detection capacitor is full of；
S3, according to the charging time detected it can be learnt that the corresponding key being pressed.
Further, the step S1 specifically: power supply is passed through into charge control after the circuit of line control push-button partial pressure
Circuit is discharged after capacitor is fully charged by charge/discharge control circuit to capacitor charging, charging control circuit and control of discharge electricity
It routes pwm signal control and carries out alternate conduction and shutdown.
Further, the step S2 specifically: defeated after converting the voltage at capacitor both ends by level shifting circuit
Out to the I/O mouth of MCU, the I/O mouthfuls of level conditions within the period of pwm signal are detected by MCU；
The step S3 specifically: according to the level conditions detected it can be learnt that the corresponding key being pressed.
Further, in the step S2, the I/O mouthfuls of level conditions within the period of pwm signal is detected by MCU and are had
Body are as follows: MCU constantly scans I/O mouthfuls of input state within the period of pwm signal with time interval t=T/N, and obtains one group
Represent the array of I/O mouthfuls of states；Wherein T is the period of pwm signal, and N is the integer greater than 0.
The step S3 specifically: compared according to obtained array with the array value table prestored, it can be learnt that corresponding
The key being pressed.
The invention also discloses a kind of detection circuits of the line control push-button of electric resistance partial pressure type, including charging capacitor C1, charging
Control circuit, charge/discharge control circuit and level shifting circuit, the first end ground connection of the charging capacitor C1, the charging capacitor C1
Second end by the output end of charging control circuit wiring control key circuit, meanwhile, the second end of charging capacitor C1 is by putting
The control signal of electric control circuit ground connection, the charging control circuit and charge/discharge control circuit connects the first of control chip simultaneously
I/O mouthfuls, the second end of the input termination charging capacitor C1 of the level shifting circuit, the output termination of the level shifting circuit
Control the 2nd I/O mouthful of chip, the control chip the first I/O mouthful for output pwm signal control charging control circuit with
Charge/discharge control circuit alternate conduction and shutdown, the control chip obtain corresponding quilt by detecting the level conditions of the 2nd I/O
The key pressed.
Further, the control chip is MCU processor.
It further, further include charging current limiter resistance Ra and electric discharge current-limiting resistance Rd, charging current limiter resistance Ra, which is serially connected in, to be filled
On the charge circuit of capacitor C1, electric discharge current-limiting resistance Rd is serially connected on the discharge loop of charging capacitor C1.
Further, the charging control circuit is the secondary switch circuit being made of NPN triode Q2 and PMOS tube Q1.
Further, the charge/discharge control circuit is the secondary switch circuit being made of NPN triode Q3 and Q4.
Further, the level shifting circuit includes NPN triode Q5 and resistance Rg, the base of the NPN triode Q5
Pole connects the second end of charging capacitor C1, the emitter ground connection of the NPN triode Q5, the collector of the NPN triode Q5
Series resistance meets power supply VCC, while connecing the 2nd I/O mouthfuls of control chip.
Advantageous effects of the invention:
The present invention can be suitably used for the electric resistance partial pressure type line control push-button circuit of different circuit structures, be suitable for different MCU platforms
With different power-supply systems, development cost is saved, shortens the development cycle for matching exploitation with depot, and circuit structure letter
It is single, it is easy to accomplish, only special analog-to-digital conversion need to be not necessarily to using the one common I/O mouthfuls and one I/O mouths with PWM function
MCU inside chip detection or detection device has ADC function, at low cost.
Detailed description of the invention
Fig. 1 is the method flow diagram of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the embodiment of the present invention；
Fig. 3 is the level detection schematic diagram of the embodiment of the present invention；
Fig. 4 is the program flow diagram of the embodiment of the present invention.
Specific embodiment
Now in conjunction with the drawings and specific embodiments, the present invention is further described.
As shown in Figure 1, a kind of detection method of the line control push-button of electric resistance partial pressure type, includes the following steps:
S1 gives power supply to capacitor charging after the circuit of line control push-button partial pressure.
S2, detection capacitor fully charged charging time.
S3, according to the charging time detected it can be learnt that the corresponding key being pressed.
In this specific embodiment, the step S1 specifically: by power supply by filling after the circuit of line control push-button partial pressure
Electric control circuit is discharged after capacitor is fully charged by charge/discharge control circuit to capacitor charging, charging control circuit and electric discharge
The pwm signal control that control circuit is provided by MCU carries out alternate conduction and shutdown, realizes and carries out cycle charge-discharge to capacitor.
In this specific embodiment, the step S2 specifically: convert the voltage at capacitor both ends by level shifting circuit
It is exported afterwards to the I/O mouth of MCU, the I/O mouthfuls of level conditions within the period of pwm signal is detected by MCU, specifically, MCU exists
I/O mouthfuls of input state is constantly scanned with time interval t=T/N in the period of pwm signal, and is obtained one group and represented I/O mouthfuls
The array of state is made of number 0 and 1；Wherein T is the period of pwm signal, and N is the integer greater than 0.The cycle T of pwm signal,
The duty ratio in the period of pwm signal and the value of N are selected according to the circuit of specific line control push-button, and the value of N is bigger,
Detection accuracy is higher, but can also increase accordingly the treating capacity of MCU, therefore, can select a desired value according to the actual situation, this
It is that those skilled in the art can realize easily, is no longer described in detail.
In this specific embodiment, the step S3 specifically: carried out according to obtained array with the array value table prestored couple
Than it can be learnt that the corresponding key being pressed.
Firstly, debugged to the key circuit of different electric resistance partial pressure types, obtain for the circuit structure representative not
The array value of I/O mouth state when with by key pressing, these array values are stored in the internal storage of MCU；Then, exist
The array value that will test in actual use and the array value table prestored compare, and finally show which key press is.
The principle of this method is further described below in conjunction with physical circuit schematic diagram.
As shown in Fig. 2, the invention also discloses a kind of detection circuit of the line control push-button of electric resistance partial pressure type, including charging electricity
Hold C1, charging current limiter resistance Ra, electric discharge current-limiting resistance Rd, charging control circuit, charge/discharge control circuit and level shifting circuit, this
In specific embodiment, charging control circuit includes NPN triode Q2 and PMOS tube Q1, and charge/discharge control circuit includes NPN triode
Q3 and Q4, level shifting circuit include NPN triode Q5 and resistance Rg.
The first end of the charging capacitor C1 is grounded, and the second end of the charging capacitor C1 connects the leakage of PMOS tube Q1 respectively
Pole, NPN triode Q5 base stage and discharge current-limiting resistance Rd first end, the source connection control key circuit 1 of PMOS tube Q1
Output end, while serial connection charge current-limiting resistance Ra meets power supply VCC, in this specific embodiment, line control push-button circuit 1 shown in Fig. 2
For a kind of line control push-button circuit of steering wheel, but not limited to this, it is other any to be all suitable for using the line control push-button of electric resistance partial pressure type
In the present invention.
The grid of the PMOS tube Q1 is connected NPN triode Q2 ground connection all the way, and another way series resistance Rb meets PMOS tube Q1
Source electrode, the base series resistor Rc of NPN triode Q2 connects the first I/O mouthful of control chip (not shown), this is specific in fact
Apply in example, control chip be MCU, the first I/O mouthful be used for output pwm signal, certainly, in other embodiments, control chip
It can be other programs that can execute and carry out processing calculating control, and with I/O mouthfuls of equipment, such as PLC controller.
The collector of the second termination NPN triode Q3 of electric discharge current-limiting resistance Rd, the emitter ground connection of NPN triode Q3,
The base stage of NPN triode Q3 connects the collector of NPN triode Q4 all the way, and another way series resistance Re connects power supply VCC, tri- pole NPN
The emitter of pipe Q4 is grounded, and the base series resistor Rf of NPN triode Q4 connects the first I/O mouthfuls.
The emitter of NPN triode Q5 is grounded, and series resistance Rg meets power supply VCC to the collector of NPN triode Q5 all the way, and one
Road connects the 2nd I/O mouthfuls of MCU, MCU the 2nd I/O mouthfuls be used as detection input.
In this specific embodiment, the charging control circuit is that the second level being made of NPN triode Q2 and PMOS tube Q1 is opened
Powered-down road, certainly, in other embodiments, charging control circuit can also use existing other switching circuits, such as by one
The switching circuit etc. that triode or a metal-oxide-semiconductor are constituted, this is that those skilled in the art can realize easily, no longer in detail
Explanation.
In this specific embodiment, the charge/discharge control circuit is the secondary switch circuit being made of NPN triode Q3 and Q4,
Certainly, in other embodiments, charge/discharge control circuit can also use existing other switching circuits, such as by a triode,
Or the switching circuit etc. that a metal-oxide-semiconductor is constituted, this is that those skilled in the art can realize easily, is no longer described in detail.
In this specific embodiment, the level shifting circuit is made of NPN triode Q5 and resistance Rg, certainly, other
Level shifting circuit can also use existing other level shifting circuits in embodiment, this is that those skilled in the art can be light
It easily realizes, is no longer described in detail.
In this specific embodiment, the cycle T of pwm signal, the high level time Ton of pwm signal, pwm signal low electricity
Flat Toff and charging capacitor C1, charging current limiter resistance Ra and electric discharge current-limiting resistance Rd need to be divided according to specific resistance-type
Circuit selects their value, and the high level time Ton of pwm signal and the low level Toff of pwm signal must satisfy charging
Capacitor C1 is fully charged and is discharged, this is that those skilled in the art can realize easily, is no longer described in detail.
Detection process:
When line control push-button circuit 1 does not have by key pressing, the charging current I=Vcc* (R1+R2 of charging capacitor C1
+ ... .+Rn)/(R1+R2+....+Rn+Ra)/Resr (Resr is capacitor internal resistance herein), in the high level time of pwm signal
PMOS tube Q1 and NPN triode Q2 conducting in Ton, charging capacitor C1 charging, is located at time T0.6Inside reach 0.6V (charging capacitor
The electricity of C1 is full of, with specific reference to charging capacitor C1 type selecting and change), triode Q5 conducting, the 2nd I/O mouthfuls be pulled to low electricity
It is flat.PMOS tube Q1 and NPN triode Q2 is closed in the low level time Toff of pwm signal, and charging capacitor C1 stops charging,
NPN triode Q3 is closed, NPN triode Q4 conducting, charging capacitor C1 electric discharge.NPN triode Q5 cut-off, the 2nd I/O mouthfuls drawn
To high level.During T=Ton+Toff, MCU constantly scans the 2nd I/O mouthfuls of input states with time interval t=T/N, and
One group of array for representing I/O state is obtained, array is indicated by number 0,1.Fig. 3 show detecting when not pressing the button
2nd I/O mouthfuls of level change, the array detected are [110000001111], represent nothing by key pressing, certainly, according to N
The difference of value, the array detected is also different, but all corresponding with the state of line control push-button circuit 1.
N needs to select its value according to specific resistance-type bleeder circuit.
When line control push-button circuit 1 has arbitrarily by key pressing, the charging current I=Vcc* (R1+R2 of charging capacitor C1
+ ... .+Rn)/(R1+R2+....+Rn+Ra)/Resr (Resr is capacitor internal resistance herein), wherein Rx is any by key pressing
When, the external resistance value of electric resistance partial pressure type line control push-button circuit 1, therefore, different according to the key pressed, the value of Rx is not
Together, the charging current I of charging capacitor C1 is just different, so that the charging time of charging capacitor C1 is also different, the second last I/O
The array value for the I/O level change that mouth detects in time T is also different.
The key circuit of different electric resistance partial pressure types is debugged, the representative different key for the circuit structure is obtained
The array value of I/O level change when pressing, these array values are stored in the internal storage of MCU, are being actually used
In the array value that will test and the array value table of storage compare, finally show which key press is.Specific procedure
Flow chart is as shown in Figure 4.
The present invention can be suitably used for the electric resistance partial pressure type line control push-button circuit of different circuit structures, be suitable for different MCU platforms
With different power-supply systems, development cost is saved, shortens the development cycle for matching exploitation with depot, and circuit structure letter
It is single, it is easy to accomplish, only special analog-to-digital conversion need to be not necessarily to using the one common I/O mouthfuls and one I/O mouths with PWM function
MCU inside chip detection or detection device has ADC function, at low cost.
Although specifically showing and describing the present invention in conjunction with preferred embodiment, those skilled in the art should be bright
It is white, it is not departing from the spirit and scope of the present invention defined by the appended claims, it in the form and details can be right
The present invention makes a variety of changes, and is protection scope of the present invention.
Claims (10)
1. a kind of detection method of the line control push-button of electric resistance partial pressure type, which comprises the steps of:
S1 gives power supply to capacitor charging after the circuit of line control push-button partial pressure；
S2, detection capacitor fully charged charging time；
S3, according to the charging time detected it can be learnt that the corresponding key being pressed.
2. the detection method of the line control push-button of electric resistance partial pressure type according to claim 1, which is characterized in that the step S1
Specifically: power supply is passed through into charging control circuit after the circuit of line control push-button partial pressure to capacitor charging, after capacitor is fully charged
It is discharged by charge/discharge control circuit, charging control circuit and charge/discharge control circuit are controlled by pwm signal and carry out alternate conduction
And shutdown.
3. the detection method of the line control push-button of electric resistance partial pressure type according to claim 2, which is characterized in that the step S2
Specifically: output detects I/O by MCU to the I/O mouth of MCU after converting the voltage at capacitor both ends by level shifting circuit
Level conditions of the mouth within the period of pwm signal；
The step S3 specifically: according to the level conditions detected it can be learnt that the corresponding key being pressed.
4. the detection method of the line control push-button of electric resistance partial pressure type according to claim 3, which is characterized in that the step S2
In, I/O mouthfuls of level conditions within the period of pwm signal are detected by MCU specifically: MCU within the period of pwm signal with when
Between interval t=T/N constantly scan I/O mouthfuls of input state, and obtain one group of array for representing I/O mouthfuls of states；Wherein T is
The period of pwm signal, N are the integer greater than 0.
The step S3 specifically: compared according to obtained array with the array value table prestored, it can be learnt that corresponding quilt
The key pressed.
5. a kind of detection circuit of the line control push-button of electric resistance partial pressure type, it is characterised in that: including charging capacitor C1, charge control electricity
Road, charge/discharge control circuit and level shifting circuit, the first end ground connection of the charging capacitor C1, the second of the charging capacitor C1
End passes through the output end of charging control circuit wiring control key circuit, meanwhile, the second end of charging capacitor C1 passes through control of discharge
The control signal of circuit ground, the charging control circuit and charge/discharge control circuit connects the first I/O mouthfuls of control chip simultaneously,
The second end of the input termination charging capacitor C1 of the level shifting circuit, the output termination control core of the level shifting circuit
The 2nd I/O mouthfuls of piece, the control chip the first I/O mouthful controlled for output pwm signal control charging control circuit and electric discharge
Circuit alternate conduction processed and shutdown, the control chip obtain corresponding be pressed by the level conditions of the 2nd I/O of detection
Key.
6. the detection circuit of the line control push-button of electric resistance partial pressure type according to claim 5, it is characterised in that: the control core
Piece is MCU processor.
7. the detection circuit of the line control push-button of electric resistance partial pressure type according to claim 5, it is characterised in that: further include charging
Current-limiting resistance Ra and the current-limiting resistance Rd that discharges, charging current limiter resistance Ra are serially connected on the charge circuit of charging capacitor C1, electric discharge limit
Leakage resistance Rd is serially connected on the discharge loop of charging capacitor C1.
8. the detection circuit of the line control push-button of electric resistance partial pressure type according to claim 5, it is characterised in that: the charging control
Circuit processed is the secondary switch circuit being made of NPN triode Q2 and PMOS tube Q1.
9. the detection circuit of the line control push-button of electric resistance partial pressure type according to claim 5, it is characterised in that: the electric discharge control
Circuit processed is the secondary switch circuit being made of NPN triode Q3 and Q4.
10. the detection circuit of the line control push-button of electric resistance partial pressure type according to claim 5, it is characterised in that: the level
Conversion circuit includes that the base stage of NPN triode Q5 and resistance Rg, the NPN triode Q5 meet the second end of charging capacitor C1, institute
The emitter ground connection of NPN triode Q5 is stated, the collector series resistance of the NPN triode Q5 meets power supply VCC, while connecing control
The 2nd I/O mouthfuls of coremaking piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710609990.2A CN109302188A (en) | 2017-07-25 | 2017-07-25 | A kind of detection method and circuit of the line control push-button of electric resistance partial pressure type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710609990.2A CN109302188A (en) | 2017-07-25 | 2017-07-25 | A kind of detection method and circuit of the line control push-button of electric resistance partial pressure type |
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| Publication Number | Publication Date |
|---|---|
| CN109302188A true CN109302188A (en) | 2019-02-01 |
Family
ID=65167740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710609990.2A Pending CN109302188A (en) | 2017-07-25 | 2017-07-25 | A kind of detection method and circuit of the line control push-button of electric resistance partial pressure type |
Country Status (1)
| Country | Link |
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| CN (1) | CN109302188A (en) |
Cited By (3)
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| 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 |
| CN113936946A (en) * | 2021-10-29 | 2022-01-14 | 广东美的厨房电器制造有限公司 | Trigger detection circuit of key, key assembly and household appliance |
| WO2023221227A1 (en) * | 2022-05-18 | 2023-11-23 | 长鑫存储技术有限公司 | Hot plugging method and apparatus for memory module, and memory module |
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