CN207336671U - A kind of test circuit and test board of button capacitance plate - Google Patents
A kind of test circuit and test board of button capacitance plate Download PDFInfo
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- CN207336671U CN207336671U CN201720865045.4U CN201720865045U CN207336671U CN 207336671 U CN207336671 U CN 207336671U CN 201720865045 U CN201720865045 U CN 201720865045U CN 207336671 U CN207336671 U CN 207336671U
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Abstract
The utility model discloses a kind of test circuit and test board of button capacitance plate, including capacitance touch screen control unit, single chip control unit, connector, power supply unit and warning circuit unit, capacitance touch screen control unit is using capacitance touch screen control IC and possesses a SDL ends, one SDA ends and at least two sensing input terminals, the sensing input terminal of capacitance touch screen control unit is electrically connected with connector, the SDL ends of capacitance touch screen control unit, SDA ends are electrically connected by I2C buses with single chip control unit, the single chip control unit is electrically connected with warning circuit unit, it is normal that warning circuit unit, which is provided as warning the button of button capacitance plate by way of luminous or sounding,；The output terminal of power supply unit is connected to the power end of capacitance touch screen control unit and the power end of single chip control unit to provide required direct current, to complete the test of the button of button capacitance plate.
Description
Technical field
It the utility model is related to a kind of technical field of measurement and test of button capacitance plate, more particularly to a kind of button capacitance plate
Test circuit, test board and test method.
Background technology
Capacitive touch screen is as a kind of simple, easily man-machine interaction mode.Have been widely used for our daily lifes
Every field living, such as smart mobile phone, intelligent watch, navigation system, display, household electrical appliance, Medical Devices.
Capacitive touch screen can provide two kinds of input patterns：Key-press input, full frame handwriting input.Wherein key-press input
Key type touch screen has been widely used for because small, light-weight, structure design is simple, is quick on the draw, is of low cost
Substitute traditional mechanical key.
Button capacitance plate is because be all the design method without control chip for demand of low cost（Control chip
On the mainboard of user）.And because this button is capacitor induction type, button can not be tested by using universal meter
Break-make（There is no the presence in circuit）, therefore, it is necessary to design test circuit to test the break-make of button.
Utility model content
The purpose of this utility model is：Provide a kind of test circuit, test board and the test side of button capacitance plate
Method, to solve the whether normal break-make of button of test button capacitance plate.
To achieve these goals, the technical scheme adopted by the utility model is that：A kind of test electricity of button capacitance plate
Road, including capacitance touch screen control unit, single chip control unit, connector, power supply unit and warning circuit unit, the electricity
Hold touch-screen control unit using capacitance touch screen control IC and possess a SDL ends, a SDA ends and at least two sensing inputs
End, the sensing input terminal of the capacitance touch screen control unit are electrically connected with connector, the capacitance touch screen control unit
SDL ends, SDA ends are electrically connected by I2C buses with single chip control unit, and the capacitance touch screen control unit is provided as sensing
The data value change of the button of button capacitance plate is so as to produce a trigger signal and trigger signal is transferred to microcontroller control
Unit, the single chip control unit are provided as receiving trigger signal and triggering warning circuit list from capacitance touch screen control unit
Member, the single chip control unit are electrically connected with warning circuit unit, the warning circuit unit be provided as by shine or
The mode of sounding is come to warn the button of button capacitance plate be normal；The output terminal of the power supply unit is connected to capacitance touch screen
The power end of control unit and the power end of single chip control unit are to provide required direct current.
Further, including a switch element and a LED light, the output terminal of the power supply unit are connected to through switch element
The power end of capacitance touch screen control unit, the power end of single chip control unit and LED light are to provide required direct current.
Further, the warning circuit unit uses LED indicating circuit unit, the LED indicating circuit unit and list
Piece machine control unit is electrically connected.LED indicating circuit unit warns the normal break-make of button in a manner of shining.
Further, the warning circuit unit uses two LED indicating circuit units, described two LED indicating circuits
Unit is electrically connected with two pins of single chip control unit respectively.If false triggering is occurred using a LED indicating circuit unit
Or failure can influence to judge the whether normal break-make of button, a LED instruction electricity can be reduced using two LED indicating circuit units
The probability of miscarriage of justice that false triggering occurs for road unit or failure is brought.
Further, the LED indicating circuit unit is made of a light emitting diode, or by a light emitting diode
It is in series with a resistance.Simple in structure, cost is low.
Further, the warning circuit unit includes drive circuit of loudspeaker unit and loudspeaker, and the microcontroller control is single
Member is electrically connected with the input terminal of drive circuit of loudspeaker unit, and the output terminal of the drive circuit of loudspeaker unit is connected to loudspeaker.With
The mode of light warns the normal break-make of button
Further, the power supply unit uses battery or power supply adaptor.
A kind of test circuit plate of button capacitance plate, includes a kind of test circuit and one of above-mentioned button capacitance plate
Pcb board, the test circuit of the button capacitance plate are located on pcb board.
A kind of test method of button capacitance plate, based on a kind of test circuit of above-mentioned button capacitance plate, when by
When the tested button of keyed capacitance plate is not by touch screen, button charging T1s of the capacitance touch screen control IC to button capacitance plate
Second, capacitance touch screen control IC senses that the voltage data value on tested button is V1；When tested button is by touch screen, people is with pressing
Key can produce capacitance and the capacitance is in parallel with the direct-to-ground capacitance of button, and the capacitance touch screen controls IC to button capacitance plate
Button charges T1 seconds, and capacitance touch screen control IC senses that the voltage data value on tested button is V2, and capacitance touch screen controls
IC judges the size of V2 and V1, and when V2 is less than V1, capacitance touch screen control IC produces a trigger signal, and trigger signal is transmitted
To single chip control unit, single chip control unit draws high the voltage of two pins to trigger warning circuit after trigger signal is received
Unit, and shine or the mode of sounding warns, then judge that tested button is normal；When V2 is more than or equal to V1, capacitive touch
Touch screen control IC and do not produce trigger signal, warning circuit unit is not triggered, then judges tested button damage.
Compared with prior art, the beneficial effects of the utility model are：Believed by observing the light emitting diode on test board
Signal lamp listens sound horn, it is possible to efficiently, compactly completes the work of press key function testing.
Brief description of the drawings
Fig. 1 show the structure principle chart of the utility model.
In figure, 1, connector 2, capacitance touch screen control unit 3, power supply unit 4, warning circuit unit 6,
Single chip control unit 7, pcb board 8, switch element 9, LED light.
Embodiment
To make the content of the utility model clearer, with reference to meeting, to specific embodiment of the present utility model
It is described in further detail.It should be noted that for purposes of clarity, eliminated in attached drawing and explanation unrelated with the utility model
, the expression and description of component known to persons of ordinary skill in the art.
A kind of test circuit of button capacitance plate of embodiment 1, including the control of capacitance touch screen control unit 2, microcontroller
Unit 6, connector 1, power supply unit 3 and warning circuit unit 4, the capacitance touch screen control unit 2 use capacitance touch screen
Control IC and possess a SDL ends, a SDA ends and at least two sensing input terminals, the sensing of the capacitance touch screen control unit 2
Input terminal is electrically connected with connector 1, and SDL ends, the SDA ends of the capacitance touch screen control unit 2 pass through I2C buses and microcontroller
Control unit 6 is electrically connected, and the data value that the capacitance touch screen control unit 2 is provided as the button of induced key formula capacitance plate becomes
Change so as to produce a trigger signal and trigger signal is transferred to single chip control unit 6, the single chip control unit 6 is equipped with
To receive trigger signal and triggering warning circuit unit 4 from capacitance touch screen control unit 2, the single chip control unit 6 with
Warning circuit unit 4 is electrically connected, and the warning circuit unit 4 is provided as warning button by way of luminous or sounding
The button of capacitance plate is normal；The output terminal of the power supply unit 3 is connected to the power end and list of capacitance touch screen control unit 2
The power end of piece machine control unit 6 is to provide required direct current.
For embodiment 2 on the basis of embodiment 1, a kind of test circuit of button capacitance plate includes 8 He of a switch element
One LED light 9, the output terminal of the power supply unit 3 are connected to power end, the list of capacitance touch screen control unit 2 through switch element 8
Direct current of the power end and LED light 9 of piece machine control unit 6 needed for offer.Switch element is used to control power supply unit to export
Break-make, LED light then show power supply output on off operating mode.
On the basis of above-described embodiment, the warning circuit unit 4 uses LED indicating circuit unit, the LED instructions
Circuit unit is electrically connected with single chip control unit 6.LED indicating circuit unit warns the normal break-make of button in a manner of shining.
If false triggering or failure, which occurs, using a LED indicating circuit unit can influence to judge the whether positive normal open of button
Disconnected, therefore, the warning circuit unit 4 uses two LED indicating circuit units, described two LED indicating circuit unit difference
It is electrically connected with two pins of single chip control unit 6.A LED indicating circuit can be reduced using two LED indicating circuit units
The probability of miscarriage of justice that false triggering occurs for unit or failure is brought.
In order to simplify test circuit, cost is reduced.The LED indicating circuit unit is made of a light emitting diode, or
Person is in series by a light emitting diode and a resistance.
On the basis of Examples 1 and 2, the warning circuit unit 4 includes drive circuit of loudspeaker unit and loudspeaker, described
Single chip control unit 6 is electrically connected with the input terminal of drive circuit of loudspeaker unit, the output terminal of the drive circuit of loudspeaker unit
It is connected to loudspeaker.The normal break-make of button is warned in a manner of light.The drive circuit of loudspeaker unit uses triode, triode
Base stage be connected with microcontroller, the collector of the output of power supply unit and triode connects, and the radio pole of loudspeaker and triode connects
Connect, it is of course possible to series limiting resistor in the driving circuit.Drive circuit can also use special driving chip.
Based on the above technical solutions, the power supply unit 3 uses battery or power supply adaptor.Battery can use
Dry cell, storage battery and lithium battery, the output DC voltage of power supply adaptor is in 3-5V.
Specifically, capacitance touch screen control IC can be CY8C21534, Y8C21434, Focal of Cypress
FT5436, FT5406, the MSG2138 of Mstar, converge top GT5668 etc. it is very much.
Single chip control unit forms a microcontroller minimum work system, mainly using the microcontroller of 51 series
Including microcontroller, crystal oscillating circuit and reset circuit.
A kind of test circuit plate of button capacitance plate of embodiment 3, includes a kind of test of above-mentioned button capacitance plate
Circuit and a pcb board 7, the test circuit of the button capacitance plate are located on pcb board 7.
A kind of test method of button capacitance plate of embodiment 4, the test electricity based on a kind of above-mentioned button capacitance plate
Road, when the tested button of button capacitance plate is not by touch screen, the capacitance touch screen controls IC pressing to button capacitance plate
Key charges T1 seconds, and capacitance touch screen control IC senses that the voltage data value on tested button is V1；When tested button is by touch screen
When, people can produce capacitance with button and the capacitance is in parallel with the direct-to-ground capacitance of button, and the capacitance touch screen controls IC to button
The button of formula capacitance plate charges T1 second, and capacitance touch screen controls IC to sense that the voltage data value on tested button is V2, capacitance
Touch-screen control IC judges the size of V2 and V1, and when V2 is less than V1, capacitance touch screen control IC produces a trigger signal, will touch
Signalling is transferred to single chip control unit 6, single chip control unit 6 drawn high after trigger signal is received the voltage of two pins with
Warning circuit unit 4 is triggered, and is shone or the mode of sounding warns, then judges that tested button is normal；When V2 be more than etc.
When V1, capacitance touch screen control IC does not produce trigger signal, and warning circuit unit 4 is not triggered, then judges tested button damage
It is bad.
Finally it should be noted that：Above-mentioned embodiment is used for illustrating the utility model, rather than to this practicality
It is new to be limited, carried out for the technical solution that those skilled in the art can still illustrate embodiment
Modification, and any modifications and changes made to the utility model also should be regarded as the scope of protection of the utility model.
Claims (9)
1. a kind of test circuit of button capacitance plate, it is characterised in that controlled including capacitance touch screen control unit, microcontroller
Unit, connector, power supply unit and warning circuit unit, the capacitance touch screen control unit is using capacitance touch screen control IC
And possess a SDL ends, a SDA ends and at least two sensing input terminals, the sensing input terminal of the capacitance touch screen control unit
It is electrically connected with connector, SDL ends, the SDA ends of the capacitance touch screen control unit pass through I2C buses and single chip control unit
It is electrically connected, the data value change that the capacitance touch screen control unit is provided as on the button of induced key formula capacitance plate is so as to produce
Give birth to a trigger signal and trigger signal is transferred to single chip control unit, the single chip control unit is provided as from capacitive touch
Touch screen control unit and receive trigger signal and triggering warning circuit unit, the single chip control unit and warning circuit unit electricity
Connection, it is just that the warning circuit unit, which is provided as warning the button of button capacitance plate by way of luminous or sounding,
Often；The output terminal of the power supply unit is connected to the power end of capacitance touch screen control unit and the power supply of single chip control unit
Hold to provide required direct current.
A kind of 2. test circuit of button capacitance plate as claimed in claim 1, it is characterised in that including a switch element and
One LED light, the output terminal of the power supply unit are connected to power end, the microcontroller of capacitance touch screen control unit through switch element
The power end of control unit and LED light are to provide required direct current.
A kind of 3. test circuit of button capacitance plate as described in claim 1 or 2, it is characterised in that the warning electricity
Road unit uses LED indicating circuit unit, and the LED indicating circuit unit is electrically connected with single chip control unit.
A kind of 4. test circuit of button capacitance plate as claimed in claim 3, it is characterised in that the warning circuit unit
Using two LED indicating circuit units, described two LED indicating circuit units are electric with two pins of single chip control unit respectively
Connection.
A kind of 5. test circuit of button capacitance plate as claimed in claim 4, it is characterised in that the LED indicating circuit
Unit is made of a light emitting diode, or is in series by a light emitting diode and a resistance.
A kind of 6. test circuit of button capacitance plate as described in claim 1 or 2, it is characterised in that the warning electricity
Road unit includes drive circuit of loudspeaker unit and loudspeaker, the single chip control unit and the input terminal of drive circuit of loudspeaker unit
It is electrically connected, the output terminal of the drive circuit of loudspeaker unit is connected to loudspeaker.
A kind of 7. test circuit of button capacitance plate as claimed in claim 6, it is characterised in that the drive circuit of loudspeaker
Unit uses triode.
A kind of 8. test circuit of button capacitance plate as described in claim 1 or 2, it is characterised in that the power supply list
Member uses battery or power supply adaptor.
9. a kind of test circuit plate of button capacitance plate, includes a kind of survey of button capacitance plate described in claim 1-8
Circuit is tried it is characterized in that, further including a pcb board, the test circuit of the button capacitance plate is located on pcb board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720865045.4U CN207336671U (en) | 2017-07-17 | 2017-07-17 | A kind of test circuit and test board of button capacitance plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720865045.4U CN207336671U (en) | 2017-07-17 | 2017-07-17 | A kind of test circuit and test board of button capacitance plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207336671U true CN207336671U (en) | 2018-05-08 |
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ID=62377001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720865045.4U Active CN207336671U (en) | 2017-07-17 | 2017-07-17 | A kind of test circuit and test board of button capacitance plate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192921A (en) * | 2017-07-17 | 2017-09-22 | 南京华睿川电子科技有限公司 | A kind of test circuit, test board and the method for testing of button capacitance plate |
-
2017
- 2017-07-17 CN CN201720865045.4U patent/CN207336671U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192921A (en) * | 2017-07-17 | 2017-09-22 | 南京华睿川电子科技有限公司 | A kind of test circuit, test board and the method for testing of button capacitance plate |
| CN107192921B (en) * | 2017-07-17 | 2023-10-17 | 南京华睿川电子科技有限公司 | Testing circuit, testing board and testing method of button type capacitive screen |
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