CN107422214A - A kind of testing device for touch screens - Google Patents
A kind of testing device for touch screens Download PDFInfo
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- CN107422214A CN107422214A CN201710750210.6A CN201710750210A CN107422214A CN 107422214 A CN107422214 A CN 107422214A CN 201710750210 A CN201710750210 A CN 201710750210A CN 107422214 A CN107422214 A CN 107422214A
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- 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
Abstract
The invention discloses a kind of testing device for touch screens, including：Touch-screen, its one end are connected with the first line；Signal converting division board, its one end are connected with the first line other end, and the signal converting division board other end is connected with second line one end；Testing touch screen plate, its one end are connected with the second line other end；Computer, which is provided with USB interface, and the testing touch screen plate other end is connected by USB connecting lines with USB interface.Beneficial effects of the present invention：Increase block signal switching division board between touch-screen and testing touch screen plate, make electric signal isolation between testing touch screen plate and touch-screen, the ground of touch-screen and the ground of computer disconnect, touch-screen is set to be in suspended state, simultaneous computer and touch-screen and can normally carry out data transmission, to reach the purpose of debugging and test.
Description
Technical field
The present invention relates to testing touch screen technical field, in particular to a kind of testing device for touch screens.
Background technology
When the Cleaning Principle of capacitive touch screen is that human finger touches screen surfaces, finger siphons away a part by human body
Electric charge, siphon away electric charge amount and equipment ground whether with human body altogether.During when equipment with human body altogether, the quantity of electric charge phase that siphons away
Bigger, the sensitivity of touch is just high.When equipment with human body not altogether when, the quantity of electric charge that human body siphons away is with regard to smaller, at this moment
It is insensitive to easily cause touch-screen.But in the handheld device, such as mobile phone and flat board equipment, used except being held in the hand, can
The places such as the desktop, pillow, sofa of insulation can be also put into, then single finger clicking operation.In this case, equipment with
Human body is not belonging to influence touch sensitivity equivalent in " suspension " state for ground, that is, touch-screen.In order to solve to hang
Insensitive problem is touched, it is necessary to carry out debugging optimization to the inner parameter of touch screen controller under floating state, is also required to simultaneously
Special detection is done to touch-screen for this project by producer when dispatching from the factory, to ensure the superperformance of product.
Debugging at present and during test unit touch-screen, using on-line debugging, adjusted and transmission connects with the program on computer
Parameter, data and order are received, by USB and test adaptor plate, data and touch-screen are interacted.Now the ground of touch-screen with
What computer was connected together, ground and the human body of computer belong to common ground state, so touch-screen belongs to non-suspended state.This feelings
The suspension effect of touch-screen can not be debugged and detected to condition, it is necessary to be tested and tested again on a handheld device touch-screen installation
Card.The subject matter of this method of testing is, if test step is (instrument factory by re-test after assembling product) more to the rear, one
Denier test is not by needing to tear open that machine is reprocessed and debugging is verified again also, so causing larger waste and loss repeatedly.
The content of the invention
Can be with to solve the above problems, it is an object of the invention to provide a kind of testing device for touch screens, during on-line debugging
Detect the touch-screen of suspended state.
The invention provides a kind of testing device for touch screens, including：
Touch-screen, its one end are connected with the first line；
Signal converting division board, its one end are connected with the first line other end, and the signal converting division board is another
End is connected with second line one end, and the signal converting division board is used between the testing touch screen plate and the touch-screen
Electric signal isolation；
Testing touch screen plate, its one end are connected with the second line other end, and the testing touch screen plate is used to gather
With the data for sending the touch-screen；
Computer, is provided with USB interface, and the testing touch screen plate other end passes through USB connecting lines and the USB
Interface is connected, and debugging routine is loaded with the computer, and the computer is used to touch-screen is debugged and tested.
Improved as of the invention further, the signal converting division board be provided with two independent power supply Vpp1,
Vpp2 and five optocoupler IC1, IC2, IC3, IC4, IC5, first line and second line are six road signals
Connecting line, including VDD, GND, RST, SCL, SDA and INT signal.
As further improvement of the invention, the signal converting division board passes through second line and the touch-screen
Six road signals of test board connection are Vpp1, GND1, Rst1, Scl1, Sda1 and INT1 signal, and the signal converting division board leads to
It is Vpp2, GND2, Rst2, Scl2, Sda2 and INT2 signal to cross the six road signals that first line is connected with the touch-screen.
As further improvement of the invention, Vpp1 is passed through by the 5V power supplys of USB interface on the testing touch screen plate
Dc-dc decompression is 2.8V-3.6V power supply, and Vpp2 is by the 4.2V-6V electricity of battery on the signal converting division board
Power supply of the source by dc-dc decompression for 2.8V-3.6V.
As further improvement of the invention, the circuit of the signal converting division board is connected as：
Vpp1 is connected to IC1 2PIN by current-limiting resistance R1, and IC1 3PIN is connected to Rst1, and IC1 5PIN is connected to
GND2, GND2 are the negative poles of battery, and IC1 7PIN and 8PIN are connected to Vpp2, and IC1 6PIN is connected to Rst2, meanwhile, IC1
6PIN Vpp2 is connected to by pull-up resistor R11, Rst2 level is followed Rst1 level；
Vpp1 is connected to IC2 2PIN by current-limiting resistance R2, and IC2 3PIN is connected to Scl1, and IC2 5PIN is connected to
GND2, IC2 7PIN and 8PIN are connected to Vpp2, and IC2 6PIN is connected to Scl2, meanwhile, IC2 6PIN passes through pull-up resistor
R21, which is connected to Vpp2, makes Scl2 level follow Scl1 level；
Vpp2 is connected to IC3 2PIN by current-limiting resistance R3, and IC3 3PIN is connected to INT2, and IC3 5PIN is connected to
GND1, GND1 are the ground wires of USB interface on the testing touch screen plate, and IC3 7PIN and 8PIN are connected to Vpp1, IC3's
6PIN is connected to INT1, meanwhile, IC3 6PIN is connected to Vpp1 by pull-up resistor R31 makes INT1 level follow INT2's
Level；
Vpp1 is connected to IC4 2PIN by current-limiting resistance R4, and IC4 3PIN is connected to Sda1, and IC4 5PIN is connected to
GND2, IC4 7PIN and 8PIN are connected to Vpp2, and IC4 6PIN is connected to Sda2, meanwhile, IC4 6PIN passes through pull-up resistor
R41, which is connected to Vpp2, makes Sda2 level follow Sda1 level；
Vpp2 is connected to IC5 2PIN by current-limiting resistance R5, and IC5 3PIN is connected to Sda2, and IC5 5PIN is connected to
GND1, IC5 7PIN and 8PIN are connected to Vpp1, and IC5 6PIN is connected to Sda1, meanwhile, IC5 6PIN passes through pull-up resistor
R51, which is connected to Vpp1, makes Sda1 level be the level for following Sda2.
As further improvement of the invention, when Rst1 is low level, there is voltage difference between Vpp1 and Rst1 and formed
Electric current, IC1 6PIN is set to export low level, i.e. Rst2 is low level；When Rst1 is high level, do not have between Vpp1 and Rst1
Voltage difference, electric current is not formed, the 6PIN outputs for making IC1 are high level, i.e. Rst2 is high level；
When Scl1 is low level, there is voltage difference between Vpp1 and Scl1 and form electric current, IC2 6PIN is exported low electricity
Flat, i.e. Scl2 is low level；When Scl1 is high level, there is no voltage difference between Vpp1 and Scl1, do not form electric current, make IC2
6PIN output be high level, i.e. Scl2 is high level；
When INT2 is low level, there is voltage difference between Vpp2 and INT2 and form electric current, IC3 6PIN is exported low electricity
Flat, i.e. INT1 is low level；When INT2 is high level, there is no voltage difference between Vpp2 and INT2, do not form electric current, make IC3
6PIN output be high level, i.e. INT1 is high level；
When Sda1 is low level, there is voltage difference between Vpp1 and Sda1 and form electric current, IC4 6PIN is exported low electricity
Flat, i.e. Sda2 is low level；When Sda1 is high level, there is no voltage difference between Vpp1 and Sda1, do not form electric current, make IC4
6PIN output be high level, i.e. Sda2 is high level；
When Sda2 is low level, there is voltage difference between Vpp2 and Sda2 and form electric current, IC5 6PIN is exported low electricity
Flat, i.e. Sda1 is low level；When Sda2 is high level, there is no voltage difference between Vpp2 and Sda2, do not form electric current, make IC5
6PIN output be high level, i.e. Sda1 is high level.
Beneficial effects of the present invention are：
Block signal switching division board will be increased between touch-screen and testing touch screen plate, make USB switching tests plate and touch
The electric signal isolation between screen is touched, the ground on the ground and computer that reach touch-screen disconnects, and touch-screen is in suspended state, counts simultaneously
Calculation machine and touch-screen and can normally carry out data transmission, to reach the purpose of debugging and test.
Make touch-screen under suspended state, using computer come debug with test touch screen, make the debugging and survey of touch-screen
Examination is more accurate practical, and the parameter of debugging more matches with terminal practical application, adds the performance and effect of product.It is such outstanding
Floating detection can not have to carry out after loading onto equipment complete machine, can be completed in one-body touch screen.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of testing device for touch screens described in the embodiment of the present invention；
The circuit connection diagram of signal converting division board in Fig. 2 Fig. 1.
In figure,
101st, computer；102nd, the USB interface of computer；103rd, display interface；104th, USB connecting lines；105th, touch-screen
Test board；106th, the first line；107th, touch-screen；108th, signal converting division board；109th, the second line.
Embodiment
The present invention is described in further detail below by specific embodiment and with reference to accompanying drawing.
As shown in figure 1, a kind of testing device for touch screens of the embodiment of the present invention, including：Computer 101, testing touch screen
Plate 105, signal converting division board 108 and touch-screen 107.The one end of touch-screen 107 is connected with the first line 106.Signal converting every
It is connected from the one end of plate 108 with the other end of the first line 106, the other end of signal converting division board 108 and one end phase of the second line 109
Even, the electric signal isolation that signal converting division board 108 is used between testing touch screen plate 105 and touch-screen 107.Testing touch screen
The one end of plate 105 is connected with the other end of the second line 109, and testing touch screen plate 105 is used for the number for gathering and sending touch-screen 107
According to.Usb 1 02 is provided with computer 101, the other end of testing touch screen plate 105 passes through USB connecting lines 104 and USB interface
102 are connected, and debugging routine is loaded with computer 101, and computer 101 is provided with the display interface 103 for being used for showing tuning parameter,
Computer 101 is used to touch-screen 107 is debugged and tested.
Signal converting division board 108 is added original test and debugging system by the present invention, is made testing touch screen plate and is touched
The electric signal isolation between screen 107 is touched, the ground on the ground and computer 101 that reach touch-screen 107 disconnects, and is in touch-screen 107
Suspended state.Signal converting division board 108 be provided with two independent power supply Vpp1, Vpp2 and five optocoupler IC1, IC2,
IC3, IC4, IC5, the first line 106 and the second line 109 are six road signal connecting lines, including VDD, GND, RST, SCL,
SDA and INT signal.Wherein, VDD is power supply signal, and GND is earth signal, and RST is reset signal, and SCL is clock signal, and SDA is
Data-signal, INT are interrupt signal.Signal converting division board 108 is connected by the second line 109 with testing touch screen plate 105
Six road signals be Vpp1, GND1, Rst1, Scl1, Sda1 and INT1 signal, represent respectively the first power supply signal, the first ground letter
Number, the first reset signal, the first clock signal, the first data-signal and the first interrupt signal；Signal converting division board 108 passes through
The six road signals that first line 106 is connected with touch-screen 107 are Vpp2, GND2, Rst2, Scl2, Sda2 and INT2 signal, respectively
Represent that second source signal, the second earth signal, the second reset signal, second clock signal, the second data-signal and second interrupt
Signal.
Wherein, Vpp1 is to be by dc-dc decompression by the 5V power supplys of USB interface on testing touch screen plate 105
The power supply of 2.8V-3.6V power supply, preferably 3V or so, Vpp2 are by the 4.2V-6V power supplys of battery on signal converting division board 108
Power supply by dc-dc decompression for 2.8V-3.6V, preferably 3V or so power supply.The output current requirement of battery can reach
To more than 100mA.
Independent power supply must be respectively adopted in the importation of photoelectrical coupler and output par, c, if both ends share one
Power supply, then the buffer action of photoelectrical coupler will lose meaning.When with photoelectrical coupler come isolation input output channel, it is necessary to
All signal (including RST, SCL, SDA and INT signal) is all isolated so that segregate both sides do not have it is any electrically
Contact, otherwise it is this isolation be nonsensical.
IC1, IC2, IC3, IC4, IC5 are optocouplers, the optional HCPL260L of model, are not limited to that model.
HCPL260L includes LVTTL electric level interfaces device, LVPECL electric level interfaces device, coupled capacitor C1, bleeder circuit, diode
1N4148 and resistance.LVTTL level is realized to the device of LVPECL level conversions, including LVTTL electric level interfaces device and
LVPECL electric level interface devices, in addition to：One coupled capacitor C1, for export the LVTTL electric level interfaces device
3.3V LVTTL level signals coupling output；One bleeder circuit, for the exchange of output will to be coupled through the coupled capacitor C1
Signal carries out partial pressure, produces the AC signal for meeting LVPECL requirements, is input to the LVPECL interface levels device.It can make
LVTTL interface levels device and the seamed connection of LVPECL interface level devices are obtained, and interface conversion chip need not be used.It is if preceding
Level LVTTL devices are open collector output, then diode 1N4148 can not have to.
As shown in Fig. 2 in order to obtain preferable common-mode rejection properties, the circuit of signal converting division board 108 is connected as：
Vpp1 is connected to IC1 2PIN by current-limiting resistance R1, and IC1 3PIN is connected to Rst1, and IC1 5PIN is connected to
GND2, GND2 are the negative poles of battery, and IC1 7PIN and 8PIN are connected to Vpp2, and IC1 6PIN is connected to Rst2, meanwhile, IC1
6PIN Vpp2 is connected to by pull-up resistor R11, Rst2 level is followed Rst1 level.When Rst1 is low level,
There is voltage difference between Vpp1 and Rst1 and form electric current, IC1 6PIN is exported low level, i.e. Rst2 is low level；Work as Rst1
When being high level, there is no voltage difference between Vpp1 and Rst1, do not form electric current, the 6PIN outputs for making IC1 are high level, i.e. Rst2
For high level.
Vpp1 is connected to IC2 2PIN by current-limiting resistance R2, and IC2 3PIN is connected to Scl1, and IC2 5PIN is connected to
GND2, IC2 7PIN and 8PIN are connected to Vpp2, and IC2 6PIN is connected to Scl2, meanwhile, IC2 6PIN passes through pull-up resistor
R21, which is connected to Vpp2, makes Scl2 level follow Scl1 level.When Scl1 is low level, there is voltage between Vpp1 and Scl1
Difference simultaneously forms electric current, IC2 6PIN is exported low level, i.e. Scl2 is low level；When Scl1 is high level, Vpp1 and Scl1
Between there is no voltage difference, do not form electric current, make IC2 6PIN export be high level, i.e. Scl2 is high level.
Vpp2 is connected to IC3 2PIN by current-limiting resistance R3, and IC3 3PIN is connected to INT2, and IC3 5PIN is connected to
GND1, GND1 are the ground wires of USB interface on testing touch screen plate 105, and IC3 7PIN and 8PIN are connected to Vpp1, IC3 6PIN
INT1 is connected to, meanwhile, IC3 6PIN is connected to Vpp1 by pull-up resistor R31 makes INT1 level follow INT2 level.
When INT2 is low level, there is voltage difference between Vpp2 and INT2 and form electric current, IC3 6PIN is exported low level, i.e.,
INT1 is low level；When INT2 is high level, there is no voltage difference between Vpp2 and INT2, do not form electric current, make IC3 6PIN
It is high level to export as high level, i.e. INT1.
Vpp1 is connected to IC4 2PIN by current-limiting resistance R4, and IC4 3PIN is connected to Sda1, and IC4 5PIN is connected to
GND2, IC4 7PIN and 8PIN are connected to Vpp2, and IC4 6PIN is connected to Sda2, meanwhile, IC4 6PIN passes through pull-up resistor
R41, which is connected to Vpp2, makes Sda2 level follow Sda1 level.When Sda1 is low level, there is voltage between Vpp1 and Sda1
Difference simultaneously forms electric current, IC4 6PIN is exported low level, i.e. Sda2 is low level；When Sda1 is high level, Vpp1 and Sda1
Between there is no voltage difference, do not form electric current, make IC4 6PIN export be high level, i.e. Sda2 is high level.
Vpp2 is connected to IC5 2PIN by current-limiting resistance R5, and IC5 3PIN is connected to Sda2, and IC5 5PIN is connected to
GND1, IC5 7PIN and 8PIN are connected to Vpp1, and IC5 6PIN is connected to Sda1, meanwhile, IC5 6PIN passes through pull-up resistor
R51, which is connected to Vpp1, makes Sda1 level be the level for following Sda2.When Sda2 is low level, there is electricity between Vpp2 and Sda2
Pressure difference simultaneously forms electric current, IC5 6PIN is exported low level, i.e. Sda1 is low level；When Sda2 is high level, Vpp2 with
There is no voltage difference between Sda2, do not form electric current, the 6PIN outputs for making IC5 are high level, i.e. Sda1 is high level.
Because Sda1 with Sda2 at testing touch screen plate 105 with touch-screen 107 is OC (opener connects) connection status,
So logical relation can with line and, i.e., two output end (including two or more) direct interconnection cans are realized " AND "
Logic function, such Sda1 and Sda2 can be followed mutually.
Testing touch screen plate 105 is connect using the IIC Inter-IntegratedCircuit (IC bus) of standard
Mouthful, after the isolation of optocoupler, the ground on the ground and computer 101 of touch-screen 107 breaks the signal on testing touch screen plate 105
Open, meanwhile, in computer 101 and oneself transmission signal of touch-screen 107, touch-screen 107 is battery powered, makes touch-screen
107 are in suspended state, and now, testing touch screen plate 105 is connected with the signal on touch-screen 107, and (Sda1 and Sda2 can be with
Follow mutually) so that computer 101 and the and can of touch-screen 107 normally carry out data transmission, to reach the mesh of debugging and test
's.
Debugging routine is loaded with computer 101, relies on the debugging circuit board that the inside of computer 101 is set, debugging electricity
Road plate includes microprocessor, decoder, switching value, D/A converting circuit, filter circuit, drive circuit, power amplification circuit, opened
Powered-down source circuit and protection circuit, the microprocessor connect respectively decoder, switching value, D/A converting circuit, drive circuit,
Power amplification circuit, switching power circuit and protection circuit, switching value connection decoder, decoder be sequentially connected drive circuit,
D/A converting circuit, D/A converting circuit connection filter circuit, filter circuit connection power amplification circuit, voltage power amplification electricity
Road connecting valve power circuit and protection circuit.The debugging circuit board is not restricted to foregoing circuit, in the prior art can be real
The circuit of existing touch-screen detection can, but at least need to meet will to access in the present invention six road signal VDD, GND, RST,
On SCL, SDA and INT signal access debugging circuit board, RST, SCL, SDA and the whole of INT signal are isolated with realizing.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (6)
- A kind of 1. testing device for touch screens, it is characterised in that including：Touch-screen (107), its one end are connected with the first line (106)；Signal converting division board (108), its one end are connected with the first line (106) other end, the signal converting isolation Plate (108) other end is connected with the second line (109) one end, and the signal converting division board (108) is surveyed for the touch-screen Electric signal isolation between test plate (panel) (105) and the touch-screen (107)；Testing touch screen plate (105), its one end are connected with the second line (109) other end, the testing touch screen plate (105) it is used for the data for gathering and sending the touch-screen (107)；Computer (101), is provided with USB interface (102), and testing touch screen plate (105) other end is connected by USB Line (104) is connected with the USB interface (102), and debugging routine is loaded with the computer (101), and the computer (101) is used Debugged and tested in touch-screen (107).
- 2. testing device for touch screens according to claim 1, it is characterised in that on the signal converting division board (108) Provided with two independent power supply Vpp1, Vpp2 and five optocouplers IC1, IC2, IC3, IC4, IC5, first line (106) and second line (109) is six road signal connecting lines, including VDD, GND, RST, SCL, SDA and INT signal.
- 3. testing device for touch screens according to claim 2, it is characterised in that the signal converting division board (108) is logical Cross the six road signals that second line (109) is connected with the testing touch screen plate (105) be Vpp1, GND1, Rst1, Scl1, Sda1 and INT1 signal, the signal converting division board (108) pass through first line (106) and the touch-screen (107) six road signals of connection are Vpp2, GND2, Rst2, Scl2, Sda2 and INT2 signal.
- 4. testing device for touch screens according to claim 2, it is characterised in that Vpp1 is by the testing touch screen plate (105) power supply of the 5V power supplys of USB interface by dc-dc decompression for 2.8V-3.6V, Vpp2 are turned by the signal on Connect power supply of the 4.2V-6V power supplys of battery on division board (108) by dc-dc decompression for 2.8V-3.6V.
- 5. testing device for touch screens according to claim 3, it is characterised in that the signal converting division board (108) Circuit is connected as：Vpp1 is connected to IC1 2PIN by current-limiting resistance R1, and IC1 3PIN is connected to Rst1, and IC1 5PIN is connected to GND2, GND2 are the negative poles of battery, and IC1 7PIN and 8PIN are connected to Vpp2, and IC1 6PIN is connected to Rst2, meanwhile, IC1 6PIN Vpp2 is connected to by pull-up resistor R11, Rst2 level is followed Rst1 level；Vpp1 is connected to IC2 2PIN by current-limiting resistance R2, and IC2 3PIN is connected to Scl1, and IC2 5PIN is connected to GND2, IC2 7PIN and 8PIN are connected to Vpp2, and IC2 6PIN is connected to Scl2, meanwhile, IC2 6PIN passes through pull-up resistor R21, which is connected to Vpp2, makes Scl2 level follow Scl1 level；Vpp2 is connected to IC3 2PIN by current-limiting resistance R3, and IC3 3PIN is connected to INT2, and IC3 5PIN is connected to GND1, GND1 are the ground wires of USB interface on the testing touch screen plate (105), and IC3 7PIN and 8PIN are connected to Vpp1, IC3 6PIN be connected to INT1, meanwhile, IC3 6PIN is connected to Vpp1 by pull-up resistor R31 makes INT1 level follow INT2 Level；Vpp1 is connected to IC4 2PIN by current-limiting resistance R4, and IC4 3PIN is connected to Sda1, and IC4 5PIN is connected to GND2, IC4 7PIN and 8PIN are connected to Vpp2, and IC4 6PIN is connected to Sda2, meanwhile, IC4 6PIN passes through pull-up resistor R41, which is connected to Vpp2, makes Sda2 level follow Sda1 level；Vpp2 is connected to IC5 2PIN by current-limiting resistance R5, and IC5 3PIN is connected to Sda2, and IC5 5PIN is connected to GND1, IC5 7PIN and 8PIN are connected to Vpp1, and IC5 6PIN is connected to Sda1, meanwhile, IC5 6PIN passes through pull-up resistor R51, which is connected to Vpp1, makes Sda1 level be the level for following Sda2.
- 6. testing device for touch screens according to claim 5, it is characterised in thatWhen Rst1 is low level, there is voltage difference between Vpp1 and Rst1 and form electric current, IC1 6PIN is exported low level, That is Rst2 is low level；When Rst1 is high level, there is no voltage difference between Vpp1 and Rst1, do not form electric current, make IC1's 6PIN outputs are high level, i.e. Rst2 is high level；When Scl1 is low level, there is voltage difference between Vpp1 and Scl1 and form electric current, IC2 6PIN is exported low level, That is Scl2 is low level；When Scl1 is high level, there is no voltage difference between Vpp1 and Scl1, do not form electric current, make IC2's 6PIN outputs are high level, i.e. Scl2 is high level；When INT2 is low level, there is voltage difference between Vpp2 and INT2 and form electric current, IC3 6PIN is exported low level, That is INT1 is low level；When INT2 is high level, there is no voltage difference between Vpp2 and INT2, do not form electric current, make IC3's 6PIN outputs are high level, i.e. INT1 is high level；When Sda1 is low level, there is voltage difference between Vpp1 and Sda1 and form electric current, IC4 6PIN is exported low level, That is Sda2 is low level；When Sda1 is high level, there is no voltage difference between Vpp1 and Sda1, do not form electric current, make IC4's 6PIN outputs are high level, i.e. Sda2 is high level；When Sda2 is low level, there is voltage difference between Vpp2 and Sda2 and form electric current, IC5 6PIN is exported low level, That is Sda1 is low level；When Sda2 is high level, there is no voltage difference between Vpp2 and Sda2, do not form electric current, make IC5's 6PIN outputs are high level, i.e. Sda1 is high level.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004924A (en) * | 2018-08-31 | 2018-12-14 | 惠州市德赛西威汽车电子股份有限公司 | A kind of reset circuit touching chip |
| CN111537867A (en) * | 2020-06-03 | 2020-08-14 | 安徽方兴光电新材料科技有限公司 | Detection device and detection method for short circuit and open circuit of touch screen anti-disassembly winding wire |
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| CN107422214B (en) | 2019-08-02 |
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