CN206611400U - Multiple point touching circuit based on ADC voltage detectings - Google Patents
Multiple point touching circuit based on ADC voltage detectings Download PDFInfo
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- CN206611400U CN206611400U CN201720228025.6U CN201720228025U CN206611400U CN 206611400 U CN206611400 U CN 206611400U CN 201720228025 U CN201720228025 U CN 201720228025U CN 206611400 U CN206611400 U CN 206611400U
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Abstract
The utility model discloses a kind of multiple point touching circuit based on ADC voltage detectings.There are numerous touch points in the touch system of the touch circuit, each touch point is by individually touching chip controls as a singly-bound touch unit, set the corresponding build-out resistor of each touch unit different, different analog voltages can be exported when touching different touch units, pass through the AD functions of single-chip microcomputer again, detect magnitude of voltage, display output control module display output voltage, by different magnitudes of voltage so as to judge which touch point is touched.The utility model is touched with singly-bound cheap and easy to get based on chip and the internal single-chip microcomputer with AD analog-digital converters, is solved when there is numerous touch points in touch system, the problems such as design difficulty is big, cabling is inconvenient, cost is high.And good solution is provided to multiple point touching in ring-type touch system, novel matrix is touched same effective, touch line is greatly reduced, system design is simple and with low cost.
Description
Technical field
The utility model is a kind of multiple point touching circuit for being based on ADC (analog-to-digital conversion) voltage detecting, is related to ring-type multiple spot
Touch circuit and novel matrix formula multiple point touching circuit.
Background technology：
The touch chip of many single channels or multichannel is there is on existing market, touch control turns into common control
Mode, is widely used.Singly-bound touches chip, with low cost, and batch only needs several maos；Multichannel touches chip and although added
Passage is touched, but cost is high, and design difficulty is big.
Existing touching technique is broadly divided into resistance-type, condenser type, infrared-type and surface acoustic wave type and touched, as base
Plinth generates many emerging technologies again, and they could support up two touch points by special algorithm and complicated technology, its
In truly reach multiple point touching is to ensure the non-interfering matrix multiple spot of each working node using matrix keyboard
Touching technique, but be due to that matrix multiple point touching needs a large amount of electrodes and interface, cost is high, design difficulty is big, to cabling, plank shape
Between shape, touch point and touch point, touch point and chip distance etc. have a strict demand, and need to be answered effectively touching area
Miscellaneous calculating, and have the defect for touching blind area and need complicated algorithm.
(1) in many systems in touch point, single touch chip is difficult to meet to require, needing multiple chips to coordinate makes
With；(2) multichannel touches chip signal output number correspondence touch point number, therefore can produce crowd when there is many touch points
Multi-touch signal, even if entering row decoding again afterwards, can also retain many signal wires；(3) multichannel touches chip and welded to touching
Line between disk and chip and pad etc. has very high requirement, and the fine or not influence to whole touch system of cabling is larger.
The today developed in multiple point touching technology high-speed, easily low cost, design, high-performance are the demands of people.This practicality
The multiple point touching circuit based on ADC voltage detectings of new design can realize these requirements.
The content of the invention：
In order to solve problem present in background technology, multiple point touching technology is furtherd investigate, from a kind of simple ripe list
Touch element circuit designs multiple point touching circuit.When purpose is to solve to there is numerous touch points in touch system, design
The problems such as difficulty is big, cabling is inconvenient, cost is high.In addition the touch system in ring-type multiple point touching circuit of the present utility model is big
Reduce port and electrode greatly；Gained enlightenment from original matrix touching technique, design novel matrix formula multiple point touching circuit.This electricity
Road principle is simple, facilitate system design, and with low cost, reliability is high, equipment is easy to get.
The technical solution adopted in the utility model is：
Numerous singly-bounds are there are on existing market and touch chip, with low cost, batch only needs several maos；While in the market
There is the single-chip microcomputer of AD analog-digital converters in the presence of a large amount of inside, the utility model is by touching the touches of different singly-bound touch units
Chip, produces touch signal, so that PMOS is turned on, by setting the corresponding different resistance values of PMOS source electrode, PMOS source
Extremely corresponding A points export different voltages, then by the AD functions of single-chip microcomputer, detect magnitude of voltage, and display/output control module shows
Show output voltage, by different magnitudes of voltage so as to judge which touch point is touched.
Numerous touch points are there are in the utility model touch system, each touch point is by individually touching chip controls
As a singly-bound touch unit, as shown in Figure 2.The utility model touches chip, with low cost, function using TTP223 singly-bounds
It is stable, select the high level or low level of Direct Model effective by AHLB pins, output mode is selected by TOG pins, passed through
It is that AHLB pin and 6 pin i.e. TOG pin configuration touch the output of the pin of chip 1 to touch the pin of chip 4, and effectively, i.e., touch point T1 has tactile to low level
When touching, low level is exported, high level is otherwise exported.The characteristics of touching the gate pole that chip output pin 1 connects PMOS, PMOS be
Low level is turned on, high level cut-off, therefore when having touch signal, touches the pin of chip 1 output low level, so that PMOS is turned on,
The source electrode connecting resistance RS of PMOS, when PMOS is turned on, there is voltage output at A ends.Each singly-bound touch unit is except build-out resistor
RS values are different, and other conditions are identical, thus when its touch point is touched the corresponding A points output of each singly-bound touch unit electricity
Pressure is different.
The voltage detecting structure chart of multiple point touching circuit as shown in Figure 3 is devised based on Fig. 2, Q1, Q2, Q3, Q4 end are
The gate pole of PMOS, the gate pole of each PMOS is connected with the output end Q ends of TTP223 chips in Fig. 2 singly-bound touch units,
Constitute four independent singly-bound touch units, connected mode such as Fig. 2 of four singly-bound touch units, its only four build-out resistors
RS1, RS2, RS3, RS4 are different.When some touch point is touched, the touch chip Q ends of the singly-bound touch unit export low electricity
It is flat, so that the PMOS conducting being connected with Q ends, because each touch point corresponding build-out resistor RS1, RS2, RS3, RS4 are different,
So voltage detecting point A voltage is different, calculation formula is VA=5V*RS/ (RS+R), if setting R=1K Ω, AD detection voltage model
0-3.3V is enclosed, ignores PMOS pressure drop, then calculates and obtains the following form of each resistance value：
The corresponding resistance of touch unit is selected successively during design circuit.
It is illustrated in figure 4 Chip Microcomputer A/D touch detection circuit figure of the present utility model.Fig. 3 and Fig. 5 voltage detection signal
Point A meets AD conversion the pin A1 or A2 of single-chip microcomputer；The AD conversion that Fig. 6 voltage detection signal point A1, A2 connects single-chip microcomputer respectively is drawn
Pin A1 and A2, by the AD functions of single-chip microcomputer, detect magnitude of voltage, display/output control module display output voltage.These are pre-
If electric resistance partial pressure value saved with array, compareed by the method tabled look-up with output voltage so which touch point quilt judged
Triggering.
The utility model uses above-mentioned technical proposal, has the advantages that：
(1) solve when there is numerous touch points in touch system, the problem of design difficulty is big, cabling is inconvenient；(2) save
Save development time and development cost；(3) holistic cost of touch system is saved.(4) because touch unit is that singly-bound is touched, work
It is separate, require that multiple touch unit cooperation reliabilities are higher compared to other multiple point touchings.(5) compared to existing
This scheme of matrix multiple point touching technology can not only reach the effect of multiple point touching but also without being answered effectively touching area
Miscellaneous calculating, the defect of no touch blind area and algorithm that need not be complicated.(6) the utility model multiple point touching circuit can be very big
Reduce electrode and port in degree, reduce cost, the electrode of ring-type multiple point touching circuit and port are less.(7) the utility model
Each working cell independently of one another, mistaken touch or multiple touch points will not be touched in a touch unit；(8) this practicality is new
Type can reach the effect of multiple point touching by single touch chip.
Brief description of the drawings：
Fig. 1 is entire block diagram of the present utility model；
Fig. 2 is singly-bound touch unit circuit diagram of the present utility model；
Fig. 3 is multiple point touching voltage detecting structure chart of the present utility model；
Fig. 4 is Chip Microcomputer A/D touch detection circuit figure of the present utility model；
Fig. 5 is ring-type multiple point touching circuit structure diagram of the present utility model；
Fig. 6 is novel matrix formula multiple touch points circuit structure diagram of the present utility model.
Specific embodiment：
If Fig. 1 is the overall structure block diagram of system, circuit is mainly by power module, one-chip computer module, touch modules, aobvious
Show/output control module and reset/clock module composition.Power supply is 5V dc sources, and band AD functions may be selected in single-chip microcomputer
ATMEGA8, carry 8 passage, 10 AD functions, reset circuit selection electrification reset, clock signal selection internal oscillator mode,
It can also select other models, the multiple point touching module that touch modules are made up of singly-bound touch unit (such as Fig. 1) circuit, often
The PMOS source electrode of individual singly-bound touch unit circuit matches different resistance, then voltage detecting point A, A1, A2 will export different
Voltage, then by the AD functions of single-chip microcomputer, detect magnitude of voltage, display/output control module display output voltage, by different
Magnitude of voltage is so as to judge which touch point is triggered.
As shown in Fig. 2 TTP223, which is membrane keyboard, detects IC there is provided a touch point, operating voltage is 2.0-5.5V, is originally set
The operating voltage of meter circuit is set to 5V.TTP223 selects the high level or low level of Direct Model effective by AHLB pins,
Output mode is selected by TOG pins, the design circuit is set to S1 S2 for 01 crawl low level effective models (such as Fig. 2), i.e.,
When touch point T1 in Fig. 2 has touch, pin Q exports low level, then PMOS is turned on, then A points export corresponding voltage, formula
For VA=5V*RS/ (RS+R), because the corresponding resistance of build-out resistor RS1, RS2, RS3, RS4 is different, then exports different electricity
Pressure, exports TTP223 Q pin output high level, PMOS cut-off during no touch.Cs in circuit is used for adjusting sensitivity, Cs
Value is smaller, then sensitivity is better, and the regulation of sensitivity must be according to the practical situations on PCB, and codomain is 0-50Pf, this electricity
Cs is 40pF in road.
The voltage detecting structure chart of the utility model multiple point touching circuit is illustrated in figure 3, Fig. 3 is by the list in four Fig. 2
Key touch unit circuit adds pull down resistor R to constitute, and Q1, Q2, Q3, Q4 end are the gate pole of PMOS, the gate pole of each PMOS
It is connected with the output end Q ends of TTP223 chips in Fig. 2 singly-bound touch units, constitutes four independent singly-bound touch units, four
The connected mode of singly-bound touch unit such as Fig. 2, its only four build-out resistors RS1, RS2, RS3, RS4 are different.Chosen in upper table
Singly-bound touch unit 1 arrives the corresponding build-out resistor RS of singly-bound touch unit 4 value, then when touching different touch units, voltage
Test point A voltage is different, Fig. 5 ring-type multiple point touching circuits and Fig. 6 novel matrix formula multiple point touchings based on this principle design
Circuit.
The present invention can use single chip computer AT MEGA8, carry 8 passage, 10 AD functions, voltage detecting value passes through Chip Microcomputer A/D
Function detection goes out different magnitudes of voltage, display/output control module display output voltage.These default electric resistance partial pressure values are used
Array is saved, and compares to judge which touch point is triggered with output voltage by the method tabled look-up.
Ring-type multiple point touching circuit structure diagram of the present utility model is illustrated in figure 5, convenient annular Petting Area design is only needed
3 circuit lines are wanted to connect all touch points.3 circuit lines are respectively power line, ground wire, voltage detection signal line.In Fig. 4
M1, M2, M3, M4 module be made up of the singly-bound touch unit in four Fig. 2, the build-out resistor of each singly-bound touch unit
RS1, RS2, RS3, RS4 are differed, and take touch unit 1 to arrive the corresponding resistance value of touch unit 4, voltage calculated value as above form,
When the touch point of some singly-bound touch unit is touched, TTP223 Q pin output low level, PMOS conducting, voltage inspection
Measuring point A exports corresponding voltage, then the voltage detecting point A of ring-type multiple point touching circuit is connected with the A1 pins of single-chip microcomputer, i.e.,
It is connected with the A1 ends in Fig. 4, by the AD conversion of single-chip microcomputer, detects magnitude of voltage, display/output control module display output electricity
Pressure, these default electric resistance partial pressure values are saved with array, compare to judge with output voltage by the method tabled look-up
Which touch point is triggered.
It is illustrated in figure 6 novel matrix formula multiple point touching circuit structure diagram of the present utility model, the circuit is by touch unit
M1-M16 is A1 as detection group 1, corresponding voltage detecting point, and touch unit M17-M24 is used as detection group 2, corresponding voltage
Test point is A2.The touch circuit connecting mode and Fig. 5 novel cyclic touch circuit theory are essentially identical, and difference is the electricity
Road design touch point is more, if only by AD conversion all the way, the voltage change between each touch point is too small, is unfavorable for monolithic
Machine voltage detecting, therefore 2 tunnels can be divided to be AD converted, i.e. voltage detecting point A1, A2 in Fig. 6 respectively with Fig. 4 single-chip microcomputers
A1, A2 are connected, by the AD conversion of single-chip microcomputer, detect magnitude of voltage, display/output control module display output voltage, by this
A little default electric resistance partial pressure values are saved with array, compare to judge which is touched with output voltage by the method tabled look-up
Point is triggered.
Singly-bound touches chip and not necessarily selects TTP223, also can select other singly-bounds and touches chip.
Claims (4)
1. the multiple point touching circuit based on ADC voltage detectings, it is characterised in that：Mainly by power module, one-chip computer module, touch
Module, display/output control module and reset/clock module composition, wherein touch system is made up of numerous singly-bound touch units,
Single-chip microcomputer is the single-chip microcomputer with AD analog-digital conversion functions.
2. the multiple point touching circuit according to claim 1 based on ADC voltage detectings, it is characterised in that：Each singly-bound is touched
Touching unit has a touch point, sets and touches chip low level effectively, when touch point is touched, touches the output pin of chip
For low level, the low level of output pin is connected with the gate pole of PMOS, so as to there is the PMOS of the singly-bound touch unit of touch
Pipe is turned on, and the build-out resistor of the PMOS of each singly-bound touch unit is different, exports different analog voltages, then pass through single-chip microcomputer
AD functions, detect magnitude of voltage, display/output control module display output voltage, by different magnitudes of voltage so which judge
Individual touch point is touched.
3. the multiple point touching circuit according to claim 1 based on ADC voltage detectings, it is characterised in that：In the base of right 2
Ring-type multiple point touching circuit structure is designed on plinth, only needs 3 circuit lines just to connect all touch points, 3 circuit lines
Respectively power line, ground wire, voltage detection signal line A, power line, ground wire, the voltage detection signal of each singly-bound touch unit
Point A is corresponding with the power line, ground wire and voltage detection signal line of ring-type multiple point touching circuit to be connected, and all touch points are corresponding
The outside that singly-bound touch unit is all placed on 3 circuit lines constitutes ring-type multiple point touching circuit, there is when there is multiple rings multiple
Voltage detection signal line, by the AD conversion of single-chip microcomputer, detects magnitude of voltage, display/output control module display output voltage is led to
Different magnitudes of voltage are crossed to judge which touch point is touched.
4. the multiple point touching circuit according to claim 1 based on ADC voltage detectings, it is characterised in that：In the base of right 1
Devise novel matrix formula multiple point touching circuit on plinth, each pair singly-bound touch unit is located at 3 circuit line same positions respectively
Both sides, line up matrix form, power line, ground wire, voltage detection signal point A and the matrix form multiple point touching of each singly-bound touch unit
Power line, the ground wire of circuit are connected with voltage detection signal line correspondence, regard touch point M1-M16 as detection group 1, corresponding electricity
Pressure detection signaling point is A1, and touch point M17-M24 is as detection group 2, and corresponding voltage detection signal point is A2, by A1, A2 with
A1, A2 of Chip Microcomputer A/D touch detection circuit are connected, by the AD conversion of single-chip microcomputer, detect magnitude of voltage, display/output control mould
Block display output voltage, by different magnitudes of voltage so as to judge which touch point is triggered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720228025.6U CN206611400U (en) | 2017-03-09 | 2017-03-09 | Multiple point touching circuit based on ADC voltage detectings |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720228025.6U CN206611400U (en) | 2017-03-09 | 2017-03-09 | Multiple point touching circuit based on ADC voltage detectings |
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| CN206611400U true CN206611400U (en) | 2017-11-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994888A (en) * | 2017-12-01 | 2018-05-04 | 江苏邦融微电子有限公司 | A kind of singly-bound touches the compatible height of scheme effectively protection circuit and its implementation |
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2017
- 2017-03-09 CN CN201720228025.6U patent/CN206611400U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994888A (en) * | 2017-12-01 | 2018-05-04 | 江苏邦融微电子有限公司 | A kind of singly-bound touches the compatible height of scheme effectively protection circuit and its implementation |
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Granted publication date: 20171103 Termination date: 20200309 |
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