CN109560804A - Touch key control method, control circuit and chip - Google Patents
Touch key control method, control circuit and chip Download PDFInfo
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- CN109560804A CN109560804A CN201811320316.3A CN201811320316A CN109560804A CN 109560804 A CN109560804 A CN 109560804A CN 201811320316 A CN201811320316 A CN 201811320316A CN 109560804 A CN109560804 A CN 109560804A
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003990 capacitor Substances 0.000 claims abstract description 125
- 238000001514 detection method Methods 0.000 claims abstract description 77
- 238000012546 transfer Methods 0.000 claims abstract description 21
- 230000004044 response Effects 0.000 claims abstract description 6
- 230000005611 electricity Effects 0.000 claims description 10
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract 5
- 230000008859 change Effects 0.000 description 5
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/962—Capacitive touch switches
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
Abstract
The invention discloses a touch key control method, a control circuit and a chip, which comprise a touch key capacitor, a detection capacitor and a control circuit, wherein the control circuit comprises a logic control circuit and a detection circuit, the logic control circuit repeatedly charges and discharges the touch key capacitor and transfers charges, the detection capacitor is repeatedly charged and discharged through the charge transfer, the detection circuit counts the charging and discharging times of the detection capacitor, and detects whether the voltage value of the detection capacitor in the set charging and discharging times meets the trigger condition. The touch key has the advantages that the touch key is repeatedly charged and discharged and the charges are transferred through the touch key capacitor, the detection capacitor is repeatedly charged and discharged through the charges transfer, the charging and discharging times of the detection capacitor are counted, whether the voltage value of the detection capacitor meets the trigger condition within the set charging and discharging times is detected, the judgment is accurate, the response time is fast, the touch key compatible with various types of touch keys and various parameters can be met by setting different charging and discharging times and different reference voltages, and the application range is wide.
Description
Technical field
The invention belongs to touch key-press technical fields, and in particular to a kind of touch key control method, control circuit, core
Piece.
Background technique
Present electronic technology development is very rapid, in order to be that we more easily use electronic product, many products
All use touch key-press as the medium of human-computer interaction.Common touch key-press can be divided into two classes: resistance-type and condenser type, mesh
Preceding apply at most is exactly capacitance type touch key.
The principle of resistive touch key is human body compressing resistance, causes resistance sizes to change, the change of resistance is entire
Circuit signal variation to reach control effect, but is exactly that resistance has to adopt later over time there are biggish defect
It could correctly be identified with biggish compressing dynamics, be slowly eliminated so as to cause this technology.
When the principle of capacitance type touch key is human body close to capacitor key, current coupling that human body generates is to static
On capacitor, so that the capacitance of key becomes larger, the variation of capacitance is judged by chip interior operating circuit, and this is become
Change is converted into digital signal, achievees the purpose that controlling electronic devices.This structure is generally used for the portable electronics such as mobile phone and sets
In standby；Another spring constructs capacitance inductor, and this structure is in air-conditioning, cooking stove, refrigerator, micro-wave oven, control panel etc.
Using relatively extensively in equal electronic devices, back lighting etc. in addition can be added below key and do various applications.
Spring is constructed capacitance inductor and is generally directly made using pcb board, the pad and surrounding ground wire at center on pcb board
A capacitor (inductance capacitance) is constituted, when finger touches PCB pad portion, finger will will affect the electric field of capacitor, quite
In increasing a part of medium between two capacitor plates, increase capacitance, capacitance type touch key principle passes through detection
The variation of this capacitance achievees the purpose that identification, and whether there is or not finger downs.Therefore, in capacitance type touch key work, it is detected
The variation of capacitance is vital.
Existing capacitance variation detection scheme is generally calculated by detecting the capacitor discharge time of key contact
The changing value of capacitor first charges to contact, then discharged by the resistance of high value (general 5M), when then calculating its electric discharge
Between obtain capacity change the case where.This detection mode is pretty good for the detection effect of single key, but needs to fill in contact
Detection process could be completed by electric discharge again after the completion of electricity, so that detection time is longer, cause touch key-press insensitive.In addition
It is by touch key-press detection method, comprising: send voltage pulse to touch key-press；Obtain the charging electricity of touch key-press capacitor
Stream；Judge whether the charging current is more than preset threshold；When the charging current is more than the preset threshold, described in determination
Touch key-press is pressed, but since the type of key is more, the various parameters of capacitance key are changed greatly, existing capacitor
Value variation detection scheme application range is small, it is therefore desirable to which a kind of detection scheme having a wide range of application is to meet user demand.
Summary of the invention
It is an object of the invention to overcome in the prior art since the type of key is more, the various parameters of capacitance key
It changes greatly, the small problem of existing capacitance variation detection application range, a kind of touch key control method, control electricity is provided
Road, chip.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of touch key control method, including touch key-press capacitor, detection capacitor, the method is as follows:
To touch key-press capacitor repeated charge and electric charge transfer, by electric charge transfer to the detection capacitor charge and discharge repeatedly
Electricity；
The charge and discharge number of statistic mixed-state capacitor, and whether the voltage value for detecting detection capacitor in setting charge and discharge number is full
Sufficient trigger condition；
When meeting trigger condition, feedback signal, corresponding touch key-press response triggering are exported.
Further, when the voltage value of the detection capacitor is greater than or equal to preset reference voltage value, meet trigger condition.
Further, it charges after stablizing to touch key-press capacitor charging is carried out by current source, makes to touch by electric charge transfer
Key capacitor is touched to charge to detection capacitor.
Further, described
When charge and discharge number reaches given threshold, detects the voltage value of capacitor less than preset reference voltage value, determine to touch
Key does not trigger；
When charge and discharge number is not up to given threshold, detects the voltage value of capacitor less than preset reference voltage value, touching is determined
Key is touched not trigger；
When charge and discharge number reaches given threshold, detects the voltage value of capacitor more than or equal to preset reference voltage value, sentence
Determine touch key-press to be triggered.
Further, different triggerings is set according to the different charge and discharge number of setting and/or different reference voltage values
Condition.
A kind of touch key-press control circuit, with above-mentioned touch key control method, including touch key-press capacitor, detection
Capacitor and control circuit, the touch key-press capacitor first end are connect with the control circuit, the touch key-press capacitor second
End ground connection, the detection capacitor first end are connect with the control circuit, the second end ground connection of the detection capacitor, the control
Circuit includes logic control circuit and detection circuit, the logic control circuit to the touch key-press capacitor repeated charge and
Electric charge transfer, by electric charge transfer to the detection capacitor repeated charge, the charge and discharge of the detection circuit statistic mixed-state capacitor
Electric number, and whether the voltage value for detecting detection capacitor in setting charge and discharge number meets trigger condition.
Further, the capacitance of the detection capacitor is greater than the capacitance of touch key-press capacitor.
Further, the logic control circuit includes current source, Logic control module, first switch, second switch, institute
It states current source one end and receives supply voltage, the current source other end is connect with the first switch, the second switch, described
Logic control module controls the first switch, the second switch open and close, the first switch and touch key-press electricity
Hold first end connection, the second switch is connect with detection capacitor first end.
Further, the logic control circuit further includes biasing resistor, the biasing resistor be connected to first switch and
Between touch key-press capacitor.
Further, the current source is constant current source.
Further, the detection circuit includes counting module, comparator, and the counting module is defeated with the comparator
The positive input of outlet connection, the comparator is connect with the first end of detection capacitor, the reverse input end of the comparator
Access reference voltage.
Further, the detection circuit further includes voltage output module, the voltage output module and the comparator
Reverse input end connection, for setting and exporting different reference voltages.
A kind of chip, the integrated chip have above-mentioned touch key-press control circuit.
By the above-mentioned description of this invention it is found that compared with prior art, a kind of touch key-press control provided by the invention
Method, control circuit, chip, by passing through electric charge transfer pair to the touch key-press capacitor repeated charge and electric charge transfer
The detection capacitor repeated charge, the charge and discharge number of the detection circuit statistic mixed-state capacitor, and detect setting charge and discharge
Whether the voltage value of detection capacitor meets trigger condition in number, and accuracy of judgement, the response time is fast, by setting different charge and discharges
Electric number and different reference voltages can satisfy compatible various types of touch key-press, the touch key-press of various parameters, application
Range is wide.
Detailed description of the invention
Fig. 1 is inventive touch key control circuit block diagram；
Fig. 2 is inventive touch key control flow chart；
Fig. 3 is detection capacitor charge and discharge procedure chart.
Specific embodiment
The technical solution in the present invention is clearly and completely retouched below with reference to the attached drawing in the embodiment of the present invention
It states, it is clear that the described embodiments are merely a part of the embodiments of the present invention, instead of all the embodiments.
As shown in Figure 1, a kind of touch key-press control circuit, including touch key-press capacitor Cp, detection capacitor Cs and control electricity
Road 100, the touch key-press capacitor Cp first end are connect with the control circuit 100, the touch key-press capacitor Cp second end
Ground connection, the detection capacitor Cs first end are connect with the control circuit 100, the second end ground connection of the detection capacitor Cs, institute
Stating control circuit 100 includes logic control circuit 10 and detection circuit 20, and the logic control circuit 10 is to the touch key-press
Capacitor Cp repeated charge and electric charge transfer, by electric charge transfer to the detection capacitor Cs repeated charge, the detection electricity
The charge and discharge number of 20 statistic mixed-state capacitor Cs of road, and whether the voltage value for detecting detection capacitor Cs in setting charge and discharge number is full
The capacitance of sufficient trigger condition, detection capacitor Cs is greater than the capacitance of touch key-press capacitor Cp, detects faster, for example, touch key-press is electric
Hold the capacitance of the Cp about 5pF size before not triggering, after key triggering the capacitance of touch key-press capacitor Cp 50pF with
On, amplitude of variation is very big, and detection capacitor Cs is larger, about 10nF or so,
The logic control circuit 10 includes current source Ic, Logic control module 1, first switch SW1, second switch SW2,
The one end the current source Ic receives supply voltage, the current source Ic other end and the first switch SW1, the second switch
SW2 connection, the Logic control module 1 control the first switch SW1, the second switch SW2 open and close, and described
One switch SW1 is connect with touch key-press capacitor Cp first end, and the second switch SW2 is connect with detection capacitor Cs first end.
The logic control circuit 10 further includes biasing resistor Rs, the biasing resistor Rs be connected to first switch SW1 and
Between touch key-press capacitor Cp, the current source Ic is constant current source Ic, provides stabling current for touch key-press capacitor Cp, institute
It states biasing resistor Rs and provides overcurrent protection for touch key-press capacitor Cp, such as choosing biasing resistor Rs is 200~300 Ω,
The detection circuit 20 include counting module 2, comparator U, voltage output module 3, the counting module 2 with it is described
The output end of comparator U connects, and the counting module is counter, the positive input and detection capacitor of the comparator U
The first end of Cs connects, and the reverse input end of the comparator U accesses reference voltage Vref, the voltage output module 3 and institute
The reverse input end connection of comparator U is stated, voltage output module 3 is also connect with Logic control module 1, passes through Logic control module
1 control voltage output module 3 sets and exports different reference voltage Vref, and the voltage output module is the selection of benchmark voltage
Device.
As shown in Fig. 2, a kind of touch key control method, controls above-mentioned touch key-press control circuit, including following step
It is rapid:
S1: logic control circuit 10 turns the touch key-press capacitor Cp repeated charge and electric charge transfer by charge
It moves to the detection capacitor Cs repeated charge,
Specifically, after power-up, getting out reference voltage Vref and current source Ic, such as reference voltage can be chosen
Within the scope of 1.5V~3V, current source Ic meets touch key-press capacitor Cp and detection capacitor Cs within the scope of 500u~5mA Vref
To ground, the charge of remaining is all released on the ground, residual charge is eliminated, open first switch SW1 by current source Ic into
Row touch key-press capacitor Cp charging after charging complete, closes first switch SW1 and second switch SW2, waits touch key-press capacitor
The voltage stabilization of Cp prevents from influencing accuracy there are tail current or voltage fluctuation, after the voltage stabilization of touch key-press capacitor Cp,
It closes first switch SW1 and opens second switch SW2, so that touch key-press capacitor Cp is carried out electric charge transfer and detection capacitor Cs is filled
Electricity, as shown in figure 3, the voltage of detection capacitor Cs has risen to a step, after the two charge balance, close first switch SW1 and
Second switch SW2, the voltage stabilization for waiting touch key-press capacitor Cp, detecting capacitor Cs, prevents that there are tail current or voltage waves
It is dynamic to influence accuracy；
S2: the charge and discharge number of 20 statistic mixed-state capacitor Cs of detection circuit, and detect detection electricity in setting charge and discharge number
Whether the voltage value for holding Cs meets trigger condition,
Specifically, meeting triggering item when the voltage value for detecting capacitor Cs is greater than or equal to preset reference voltage Vref value
Part, the voltage that will test capacitor Cs is compared with reference voltage Vref by comparator U, if reaching reference voltage Vref,
Comparator U overturns output signal, is set by the different charge and discharge number of setting or different reference voltage Vref values different
Trigger condition, to meet the triggering of different touch key-press,
When charge and discharge number reaches given threshold, voltage value is less than preset reference voltage Vref, touch key-press is determined not
Triggering repeats that touch key-press capacitor Cp and detection capacitor Cs are connected to ground in S1, the charge of remaining is all released on the ground；
When charge and discharge number is not up to given threshold, voltage value is less than preset reference voltage Vref, touch key-press is determined
It does not trigger, repeats to open first switch SW1 in S1 by current source Ic to progress touch key-press capacitor Cp charging；
When charge and discharge number reaches given threshold, voltage value is greater than or equal to preset reference voltage Vref, determine to touch
Key is triggered, and enters and detect next time, repeats that touch key-press capacitor Cp and detection capacitor Cs are connected to ground in S1, remaining
Charge be all released on the ground；
S3: when meeting trigger condition, Logic control module 1 exports feedback signal Vout, corresponding touch key-press response touching
Hair.
By the above-mentioned description of this invention it is found that compared with prior art, a kind of touch key-press control provided by the invention
Method, control circuit, chip, to the touch key-press capacitor repeated charge and electric charge transfer, by electric charge transfer to described
Capacitor repeated charge, the charge and discharge number of the detection circuit statistic mixed-state capacitor are detected, and detects setting charge and discharge number
Whether the voltage value of interior detection capacitor meets trigger condition, and accuracy of judgement, the response time is fast, by setting different charge and discharge time
Several and different reference voltages can satisfy compatible various types of touch key-press, the touch key-press of various parameters, application range
Extensively.
It above are only several specific embodiments of the invention, but the design concept of the present invention is not limited to this, all benefits
It is made a non-material change to the present invention, should all be belonged to behavior that violates the scope of protection of the present invention with this design.
Claims (13)
1. a kind of touch key control method, it is characterised in that: including touch key-press capacitor, detection capacitor, the method is as follows:
To touch key-press capacitor repeated charge and electric charge transfer, by electric charge transfer to the detection capacitor repeated charge；
The charge and discharge number of statistic mixed-state capacitor, and detect in default charge and discharge number, whether the voltage value for detecting capacitor is full
Sufficient trigger condition；
When meeting trigger condition, feedback signal, corresponding touch key-press response triggering are exported.
2. touch key control method according to claim 1, it is characterised in that: by current source to progress touch key-press
Capacitor charging after charging is stablized, makes touch key-press capacitor charge detection capacitor by electric charge transfer.
3. touch key control method according to claim 1, it is characterised in that: the voltage value of the detection capacitor is greater than
Or when being equal to preset reference voltage value, meet trigger condition.
4. touch key control method according to claim 3, it is characterised in that: described
When charge and discharge number reaches given threshold, detects the voltage value of capacitor less than preset reference voltage value, touch key-press is determined
It does not trigger；
When charge and discharge number is not up to given threshold, detects the voltage value of capacitor less than preset reference voltage value, determines to touch and press
Key does not trigger；
When charge and discharge number reaches given threshold, detects the voltage value of capacitor more than or equal to preset reference voltage value, touching is determined
Key is touched to be triggered.
5. touch key control method according to claim 3, it is characterised in that: according to the different charge and discharge number of setting
And/or different reference voltage values sets different trigger conditions.
6. a kind of touch key-press control circuit, it is characterised in that: with touch key-press control described in claim 1-5 any one
Method processed, including touch key-press capacitor, detection capacitor and control circuit, the touch key-press capacitor first end and control electricity
Road connection, the touch key-press capacitor second end ground connection, the detection capacitor first end are connect with the control circuit, the inspection
The second end ground connection of capacitor is surveyed, the control circuit includes logic control circuit and detection circuit, the logic control circuit pair
The touch key-press capacitor repeated charge and electric charge transfer, by electric charge transfer to the detection capacitor repeated charge, institute
The charge and discharge number of detection circuit statistic mixed-state capacitor is stated, and the voltage value for detecting the detection capacitor in default charge and discharge number is
It is no to meet trigger condition.
7. touch key-press control circuit according to claim 6, it is characterised in that: the capacitance of the detection capacitor is greater than touching
Touch the capacitance of key capacitor.
8. touch key-press control circuit according to claim 6 or 7, it is characterised in that: the logic control circuit includes
Current source, Logic control module, first switch, second switch, described current source one end receive supply voltage, and the current source is another
One end is connect with the first switch, the second switch, and the Logic control module controls the first switch, described second
It closes the switch and disconnects, the first switch is connect with touch key-press capacitor first end, the second switch and detection capacitor the
One end connection.
9. touch key-press control circuit according to claim 8, it is characterised in that: the logic control circuit further includes inclined
Resistance is set, the biasing resistor is connected between first switch and touch key-press capacitor.
10. touch key-press control circuit according to claim 8, it is characterised in that: the current source is constant current source.
11. touch key-press control circuit according to claim 6 or 7, it is characterised in that: the detection circuit includes counting
Module, comparator, the counting module are connect with the output end of the comparator, the positive input of the comparator and detection
The first end of capacitor connects, and the reverse input end of the comparator accesses reference voltage.
12. touch key-press control circuit according to claim 6, it is characterised in that: the detection circuit further includes voltage
Output module, the voltage output module are connect with the reverse input end of the comparator, for setting and exporting different bases
Quasi- voltage.
13. a kind of chip, it is characterised in that: the integrated chip has the right to require touch key-press control described in 6-12 any one
Circuit processed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320316.3A CN109560804A (en) | 2018-11-07 | 2018-11-07 | Touch key control method, control circuit and chip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320316.3A CN109560804A (en) | 2018-11-07 | 2018-11-07 | Touch key control method, control circuit and chip |
Publications (1)
| Publication Number | Publication Date |
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| CN109560804A true CN109560804A (en) | 2019-04-02 |
Family
ID=65865986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811320316.3A Pending CN109560804A (en) | 2018-11-07 | 2018-11-07 | Touch key control method, control circuit and chip |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110176922A (en) * | 2019-06-21 | 2019-08-27 | 苏州锴威特半导体有限公司 | Capacitance type touch key detection circuit |
| CN110850478A (en) * | 2019-11-26 | 2020-02-28 | 出门问问信息科技有限公司 | Touch detection method, equipment and device and computer readable storage medium |
| CN112039512A (en) * | 2020-09-03 | 2020-12-04 | 上海东软载波微电子有限公司 | Capacitive touch key system and key detection method thereof |
| CN112073047A (en) * | 2020-09-09 | 2020-12-11 | 上海东软载波微电子有限公司 | Capacitive touch key system and control method thereof |
| CN113037265A (en) * | 2019-12-24 | 2021-06-25 | 上海美仁半导体有限公司 | Electric equipment, touch chip, and detection device and method for capacitive touch key |
| CN114221644A (en) * | 2022-02-22 | 2022-03-22 | 杭州炬源智能科技有限公司 | Intelligent water meter with touch keys and detection method of touch keys |
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| CN107508586A (en) * | 2017-08-08 | 2017-12-22 | 深圳市锦锐科技有限公司 | A kind of super low-power consumption touch key-press circuit and its application method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110176922A (en) * | 2019-06-21 | 2019-08-27 | 苏州锴威特半导体有限公司 | Capacitance type touch key detection circuit |
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| CN110850478A (en) * | 2019-11-26 | 2020-02-28 | 出门问问信息科技有限公司 | Touch detection method, equipment and device and computer readable storage medium |
| CN113037265A (en) * | 2019-12-24 | 2021-06-25 | 上海美仁半导体有限公司 | Electric equipment, touch chip, and detection device and method for capacitive touch key |
| CN113037265B (en) * | 2019-12-24 | 2023-06-27 | 上海美仁半导体有限公司 | Detection device and method for electrical equipment, touch chip and capacitive touch key |
| CN112039512A (en) * | 2020-09-03 | 2020-12-04 | 上海东软载波微电子有限公司 | Capacitive touch key system and key detection method thereof |
| CN112039512B (en) * | 2020-09-03 | 2024-07-19 | 上海东软载波微电子有限公司 | Capacitive touch key system and key detection method thereof |
| CN112073047A (en) * | 2020-09-09 | 2020-12-11 | 上海东软载波微电子有限公司 | Capacitive touch key system and control method thereof |
| CN112073047B (en) * | 2020-09-09 | 2024-08-16 | 上海东软载波微电子有限公司 | Capacitive touch key system and control method thereof |
| CN114221644A (en) * | 2022-02-22 | 2022-03-22 | 杭州炬源智能科技有限公司 | Intelligent water meter with touch keys and detection method of touch keys |
| CN114221644B (en) * | 2022-02-22 | 2023-08-29 | 杭州炬源智能科技有限公司 | Intelligent water meter with touch keys and detection method of touch keys |
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Application publication date: 20190402 |