CN205883191U

CN205883191U - A touch recognition system for solving unable discernment touch action of touch button

Info

Publication number: CN205883191U
Application number: CN201620641974.2U
Authority: CN
Inventors: 姚宗付; 佟国增; 叶欣
Original assignee: Suzhou Juyuan Microelectronics Ltd By Share Ltd
Current assignee: Suzhou Juyuan Microelectronics Ltd By Share Ltd
Priority date: 2016-06-24
Filing date: 2016-06-24
Publication date: 2017-01-11
Anticipated expiration: 2026-06-24

Abstract

The utility model discloses a touch recognition system for solving unable discernment touch action of touch button, logical disjunction gate including control chip, touch circuit, ADC converting circuit, high threshold judgement circuit, low threshold judgement circuit and output touch signal, the touch circuit ADC converting circuit is connected, ADC converting circuit respectively with high threshold judgement circuit and low threshold judgement circuit are connected, high threshold judgement circuit and low threshold judgement circuit all with the logic disjunction gate is connected, the logic or gate open cross the wire with control chip is connected.

Description

A kind of touch recognition system for solving touch key-press None-identified touch action

Technical field

This utility model relates to capacitance type touch key field, it particularly relates to one be used for solving touch key-press without The touch recognition system of method identification touch action.

Background technology

Compared to traditional mechanical key, capacitance touch induced key is the most durable, length in service life and take into account The advantage such as safe, attractive in appearance, the method for its most altered traditional mechanical key, only need touch gently, it is possible to the most square Reaching by key control effect just, and possess more more flexible control method, such as slip gesture control etc..It is the widest General it is applied to multiple fields such as mobile phone, household electrical appliances, Smart Home even Industry Control.In the middle of Consumer's Experience, capacitance touch sense Answering the false triggering of button or trigger insensitive it is critical that problem, the system normal initialization when powering on rises among these To important effect, the situation of operation irregularity after being otherwise likely to occur initializing, the power-up initializing how reaching stable is The problem that have to consider.

First, take off capacitance touch induced key basic functional principle, as it is shown in figure 1, during no touch, on button There is parasitic capacitance C0 of equivalence, when finger touches, it will introduce an electric capacity C1 and be parallel on button, because finger and the earth Between equivalent capacity Cbody very big, corresponding capacitive reactance can be ignored, so the electromotive force of finger is with the most of substantially equal, this Sample is equivalent on button one electric capacity C1 of parallel connection, and electric capacity increases, and corresponding conversion value becomes big, so there being no touch two A suitable threshold value is chosen, so that it may correctly identify touch action, when electric capacity conversion value is less than between conversion value in the case of Zhong During this threshold value, it is judged that for button no touch, and when electric capacity conversion value is more than this threshold value, then it is judged as touch action.

Wherein need the disturbed condition in view of environment noise, because the electric capacity on button is about tens when setting threshold value Pico farad, the capacitance variations less (within 10pf) that finger introduces, so noise jamming cannot be ignored, generally correspond to The situation of change of the electric capacity conversion value on button, is reflected in continuous several times and scans the value obtained, and can change in the range of one, Namely change between peak and minimum, within the regular hour, random during noise jamming, it is possible to will be the highest The meansigma methods of value and minimum regards electric capacity conversion value as, when finger touch, its noise jamming too follow existence, its Meansigma methods can be followed finger and be touched and become big.Button has the specifically visible figure of the noise jamming situation under the conditions of no touch two kinds Peak envelope shown in 3 and Fig. 4 and minimum envelope variation situation.

In being normally applied system, the most conventional recognition methods is: upon power-up of the system, first sweep one for touch key-press Group conversion value, chooses suitable threshold value according to this class value, then sets threshold value, now in order to meet the demand of low-power consumption, and one As require system enter low-power consumption mode, the detection work of touch key-press simultaneously is carried out always, when touch behavior having been detected Time (touch key-press conversion value is higher than setting threshold value), the system that wakes up up from low-power consumption mode starts normally, the most again to sweep one group The electric capacity conversion values of membrane keyboard, identifies which button concrete according to this class value and is touched, then perform corresponding operating.

In above-mentioned application scenarios, it requires is the behavior that can not have touch system electrification when, otherwise arises that System is after entering low-power consumption, it is impossible to the action that is touched wakes up up, and the situation that touch action subsequently also cannot be identified.Cause Touch behavior during for powering on, can cause the threshold value set first is the value that button is under touch condition, enters low in system After power consumption, being difficult to key range is touched again behavior (electric capacity conversion values when now threshold value is touch), such system is just Low-power consumption mode can be constantly in, it is impossible to by the touch behavioral arousal of button, lose the meaning of its application.

For the problem in correlation technique, effective solution is the most not yet proposed.

Utility model content

For the above-mentioned technical problem in correlation technique, the utility model proposes one and cannot know for solving touch key-press The touch recognition system of other touch action, it is possible to reaching even at time under touch condition, the touch behavior after powering on also can quilt The normal effect identified.

For realizing above-mentioned technical purpose, the technical solution of the utility model is achieved in that

A kind of touch recognition system for solving touch key-press None-identified touch action, including control chip, touch Circuit, ADC change-over circuit, high threshold decision circuitry, Low threshold decision circuitry and the logic sum gate of output touch signal；Described tactile Touch circuit to be connected with described ADC change-over circuit, described ADC change-over circuit respectively with described high threshold decision circuitry and Low threshold Decision circuitry is connected, and described high threshold decision circuitry is all connected with described logic sum gate with Low threshold decision circuitry, described Logic sum gate is connected with described control chip by wire.

Further, described high threshold values decision circuitry and low valve valve decision circuitry all include numerical value comparison module and threshold values Registration module.

The beneficial effects of the utility model: by when realizing touching detection control circuit, it is achieved waking up up of two kinds of threshold values Function, respectively high threshold wake up up and wake up up with Low threshold, meet and all can call out when being more than high threshold or be less than the condition of Low threshold The system of waking up, after so powering under button is in touch condition, arranges suitable Low threshold, and then system enters low-power consumption mould Formula, after button finger unclamps, the conversion value of scanning is less than the Low threshold set, it is possible to normal wakeup system, then starts Normal identification operates, thus solves touch-control identification system and be constantly in the problem that low power consumpting state can not be waken up.

Touch recognition system described in the utility model, uses the determination methods of two threshold values to realize the knowledge of touch action Not, touch signal, the electric capacity on such touch key-press are all produced when electric capacity conversion value is more than high threshold or is less than Low threshold Increase or electric capacity diminishes and can be correctly validated out.

Accompanying drawing explanation

In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment The accompanying drawing used required in is briefly described, it should be apparent that, the accompanying drawing in describing below is the most of the present utility model Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to according to this A little accompanying drawings obtain other accompanying drawing.

Fig. 1 is according to the touch key-press fundamental diagram described in background technology of the present utility model；

Fig. 2 is according to the touch for solving touch key-press None-identified touch action described in this utility model embodiment The structural representation of identification system；

Fig. 3 is the sight figure that works on power that the button of this utility model embodiment is in touch condition；

Fig. 4 is the sight figure that works on power that the button of this utility model embodiment is in non-tactile state；

Fig. 5 is according to a kind of method solving touch key-press None-identified touch action described in this utility model embodiment Flow chart.

In figure: 1, touch circuit；2, control chip；3, ADC change-over circuit；4, low valve valve decision circuitry；5, high threshold values is sentenced Deenergizing；6, logic sum gate.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole Embodiment.Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art are obtained, all belong to Scope in this utility model protection.

As Figure 1-5, it is used for solving touch key-press None-identified according to the one described in this utility model embodiment to touch Touch the touch recognition system of action, including control chip 7, touch circuit 1, ADC change-over circuit 3, high threshold decision circuitry 5, low Threshold decision circuit 4 and the logic sum gate 6 of output touch signal；Described touch circuit 1 is connected with described ADC change-over circuit 3, Described ADC change-over circuit 3 is connected with described high threshold decision circuitry 5 and Low threshold decision circuitry 4 respectively, and described high threshold is sentenced Deenergizing 5 is all connected with described logic sum gate 6 with Low threshold decision circuitry 4, and described logic sum gate 6 is by wire and described control Coremaking sheet 2 is connected.

Wherein, described high threshold values decision circuitry 5 and low valve valve decision circuitry 4 all include that numerical value comparison module and threshold values are deposited Module.

Described ADC change-over circuit 3 is in order to be converted to digital signal by the analogue signal on touch key-press, it is simple to digital circuit Process further；Described high threshold decision circuitry 5 is in order to the digital value changed by ADC change-over circuit 3 and the high threshold set Compare judgement, when the digital value of ADC change-over circuit 3 conversion is higher than high threshold, produce touch recognition signal；Described low threshold Value decision circuitry 4 compares judgement in order to the digital value changed by ADC change-over circuit 3 with the Low threshold set, when ADC turns Change circuit 3 conversion digital value less than Low threshold time, produce touch recognition signal；Described logic sum gate 6 is in order to by described high threshold The touch recognition signal that produces with Low threshold decision circuitry 4 of touch recognition signal that value decision circuitry 5 produces or get up, two kinds of feelings Condition is effective touch recognition signal.

A kind of method solving touch key-press None-identified touch action, comprises the following steps:

S1, to system electrification, touch key-press is taken multiple scan by system, sets out suitable high threshold values VH and low valve valve VL；

S2, system enters low-power consumption mode, continues detection touch key-press to determine whether to wake up system up；

S3, system enters normal mode after being waken up, and makes the electric capacity conversion value by obtaining touch key-press scanning respectively Compare to judge system wake-up mode with high threshold values VH and low valve valve VL；

S4, if system wakes up up owing to finger touches, identifies which button concrete and is touched and total score precipitation touch Behavior, then perform concrete to touch behavior operation；

S5, if system is taken away due to finger and waken up up, takes multiple scan touch key-press, sets and makes new advances more suitably High threshold values and low valve valve, enter step S2.

Preferably, step S1 farther includes:

S11, to system electrification；

S12, Multiple-Scan touch key-press, corresponding obtaining is organized conversion value more, takes maximum Vhigh therein and minima Vlow, calculates VH and VL according to certain algorithm；

S13, sets VH as high threshold, and VL is Low threshold.

Preferably, when being under touch condition, then the bigger conversion value when threshold value set is as touching, when being in non-tactile Under state, then the threshold value set is as less conversion value during no touch.

Preferably, step S3 farther includes:

S31, system enters normal mode of operation, first touch key-press scanning obtains one group of electric capacity conversion after being waken up Value, it is assumed that for VA；

The high-low threshold value of VA with setting is compared by S32, and when VA is more than VH, explanation is to wake up up owing to finger touches System；And when VA is less than VL, explanation is to take away due to finger and waken up system up.

Preferably, step S4 farther includes:

S41, after being judged as having finger touch key-press, is required for each key scan, be used for identify concrete which Button is touched；

S42, after recognizing concrete button touch, total score separates out the behavior type touched；

S43, performs concrete touch behavior operation.

Preferably, the behavior type of described touch include short by, long by and slide.

Preferably, when identifying in the normal mode less than the behavior of touch, for meeting low-power consumption demand, step to be entered S2, enters low power mode of operation.

Preferably, step S5 farther includes:

S51, when being judged as having waken up up system because finger takes away, when no touch, needs continuous several times to scan Touch key-press, obtains abundant electric capacity conversion value, chooses peak and minimum, and calculate the more suitably VH that makes new advances with VL；

S52, is respectively set as new VH and VL by high-low threshold value, enters step S2.

In sum, by means of technique scheme of the present utility model, by when realizing touching detection control circuit, Realize the arousal function of two kinds of threshold values, respectively high threshold to wake up up and wake up up with Low threshold, meet more than high threshold or less than low All can wake up system up during the condition of threshold value, after so powering under button is in touch condition, suitable Low threshold is set, then System enters low-power consumption mode, and after button finger unclamps, the conversion value of scanning is less than the Low threshold set, it is possible to normally call out The system of waking up, then starts to identify normally and operates, thus solve touch-control identification system be constantly in low power consumpting state can not The problem being waken up.

The touch controller judged with high-low threshold value described in the utility model, is applied to capacitance touch induced key Identification system, uses the determination methods of two threshold values to realize the identification of touch action, when electric capacity conversion value more than high threshold or All producing touch signal when person is less than Low threshold, the electric capacity on such touch key-press increases or electric capacity diminishes can be by correctly Identify.

The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this Within the spirit of utility model and principle, any modification, equivalent substitution and improvement etc. made, should be included in this utility model Protection domain within.

Claims

1. the touch recognition system being used for solving touch key-press None-identified touch action, it is characterised in that include controlling Chip, touch circuit, ADC change-over circuit, high threshold decision circuitry, Low threshold decision circuitry and output touch signal logic or Door；Described touch circuit is connected with described ADC change-over circuit, and described ADC change-over circuit judges electricity with described high threshold respectively Road is connected with Low threshold decision circuitry, described high threshold decision circuitry and Low threshold decision circuitry all with described logic sum gate phase Connecting, described logic sum gate is connected with described control chip by wire.

Touch recognition system for solving touch key-press None-identified touch action the most according to claim 1, it is special Levying and be, described high threshold values decision circuitry and low valve valve decision circuitry all include numerical value comparison module and threshold values registration module.