CN107422214B - A kind of testing device for touch screens - Google Patents

A kind of testing device for touch screens Download PDF

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Publication number
CN107422214B
CN107422214B CN201710750210.6A CN201710750210A CN107422214B CN 107422214 B CN107422214 B CN 107422214B CN 201710750210 A CN201710750210 A CN 201710750210A CN 107422214 B CN107422214 B CN 107422214B
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China
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touch screen
6pin
level
vpp1
vpp2
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CN107422214A (en
Inventor
黄效牛
王彬
左洪
周妮
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GUANDONG GLENS OPTOELECTRICS TECHNOLOGY Co Ltd
Shenzhen Yushun Industrial Intelligent Technology Co Ltd
Changsha City Yushun Display Technology Co Ltd
Shenzhen Success Electronic Co Ltd
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GUANDONG GLENS OPTOELECTRICS TECHNOLOGY Co Ltd
Shenzhen Yushun Industrial Intelligent Technology Co Ltd
Changsha City Yushun Display Technology Co Ltd
Shenzhen Success Electronic Co Ltd
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Priority to CN201710750210.6A priority Critical patent/CN107422214B/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements 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, comprising: touch screen, one end are connected with the first line;Signal converting isolation board, one end are connected with the first line other end, and the signal converting isolation board other end is connected with second line one end;Testing touch screen plate, 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 connect by USB connecting line with USB interface.Beneficial effects of the present invention: increase block signal switching isolation 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 can normally carry out data transmission again, to achieve the purpose that debugging and test.

Description

A kind of testing device for touch screens
Technical field
The present invention relates to testing touch screen technical fields, in particular to a kind of testing device for touch screens.
Background technique
When the testing principle of capacitive touch screen is that human finger touches screen surfaces, finger siphons away a part by human body Charge, siphon away charge amount and equipment ground whether with human body altogether.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 easy to cause touch screen insensitive.But in the handheld device, such as mobile phone and plate equipment, it is used in addition to being held in the hand, it 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 be equivalent to for ground, that is, touch screen in " suspension " state, influences touch sensitivity.In order to solve to hang The insensitive problem of touch under floating state, needs to carry out debugging optimization to the inner parameter of touch screen controller, be also required to simultaneously Special detection is done for this project to touch screen by producer when factory, to guarantee the superperformance of product.
When debugging at present and test unit touch screen, using on-line debugging, is adjusted with the program on computer and transmission connects Parameter, data and order is received to interact data and touch screen by USB and test adaptor plate.At this time the ground of touch screen with What computer was connected together, the ground and human body of computer belong to total ground state, so touch screen belongs to non-suspended state.This feelings The suspension effect of touch screen can not be debugged and be detected to condition, need to install touch screen and tested and tested again on a handheld device Card.The main problem of this test method is, if test step is (instrument factory by re-test after assembling product) more to the rear, one Denier test does not pass through, and also needs to tear open that machine is reprocessed and debugging is verified again, causes biggish waste and loss repeatedly.
Summary of the invention
It can be with to solve the above problems, the purpose of the present invention is to provide a kind of testing device for touch screens, when on-line debugging Detect the touch screen of suspended state.
The present invention provides a kind of testing device for touch screens, comprising:
Touch screen, one end are connected with the first line;
Signal converting isolation board, one end are connected with the first line other end, and the signal converting isolation board is another End is connected with second line one end, and the signal converting isolation board is used between the testing touch screen plate and the touch screen Electric signal isolation;
Testing touch screen plate, one end are connected with the second line other end, and the testing touch screen plate is for acquiring 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 line and the USB Interface connects, and debugging routine is loaded in the computer, the computer is for being debugged and being tested to touch screen.
Improved as of the invention further, set on the signal converting isolation board there are 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 isolation 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 isolation board is logical Crossing the six road signals that first line is connect with the touch screen is Vpp2, GND2, Rst2, Scl2, Sda2 and INT2 signal.
As further improvement of the invention, Vpp1 is passed through by the 5V power supply of USB interface on the testing touch screen plate The power supply that DC-DC converter decompression is 2.8V-3.6V, Vpp2 are by the 4.2V-6V electricity of battery on the signal converting isolation board The power supply that source is 2.8V-3.6V by DC-DC converter decompression.
As further improvement of the invention, the circuit connection of the signal converting isolation board are as follows:
Vpp1 is connected to the 2PIN of IC1 by current-limiting resistance R1, and the 3PIN of IC1 is connected to Rst1, and the 5PIN of IC1 is connected to GND2, GND2 are the cathode of battery, and the 7PIN and 8PIN of IC1 is connected to Vpp2, and the 6PIN of IC1 is connected to Rst2, meanwhile, IC1 6PIN Vpp2 is connected to by pull-up resistor R11, so that the level of Rst2 is followed the level of Rst1;
Vpp1 is connected to the 2PIN of IC2 by current-limiting resistance R2, and the 3PIN of IC2 is connected to Scl1, and the 5PIN of IC2 is connected to The 7PIN and 8PIN of GND2, IC2 are connected to Vpp2, and the 6PIN of IC2 is connected to Scl2, meanwhile, the 6PIN of IC2 passes through pull-up resistor R21 is connected to the level that Vpp2 makes the level of Scl2 follow Scl1;
Vpp2 is connected to the 2PIN of IC3 by current-limiting resistance R3, and the 3PIN of IC3 is connected to INT2, and the 5PIN of IC3 is connected to GND1, GND1 are the ground wires of USB interface on the testing touch screen plate, and the 7PIN and 8PIN of IC3 is connected to Vpp1, IC3's 6PIN is connected to INT1, meanwhile, the 6PIN of IC3, which is connected to Vpp1 by pull-up resistor R31, makes the level of INT1 follow INT2's Level;
Vpp1 is connected to the 2PIN of IC4 by current-limiting resistance R4, and the 3PIN of IC4 is connected to Sda1, and the 5PIN of IC4 is connected to The 7PIN and 8PIN of GND2, IC4 are connected to Vpp2, and the 6PIN of IC4 is connected to Sda2, meanwhile, the 6PIN of IC4 passes through pull-up resistor R41 is connected to the level that Vpp2 makes the level of Sda2 follow Sda1;
Vpp2 is connected to the 2PIN of IC5 by current-limiting resistance R5, and the 3PIN of IC5 is connected to Sda2, and the 5PIN of IC5 is connected to The 7PIN and 8PIN of GND1, IC5 are connected to Vpp1, and the 6PIN of IC5 is connected to Sda1, meanwhile, the 6PIN of IC5 passes through pull-up resistor R51, which is connected to Vpp1, makes the level of Sda1 be the level for following Sda2.
As further improvement of the invention, there is voltage difference when Rst1 is low level, between Vpp1 and Rst1 and formed Electric current, makes the 6PIN of IC1 export low level, i.e. Rst2 is low level;When Rst1 is high level, do not have between Vpp1 and Rst1 Voltage difference does not form electric current, and exporting the 6PIN of IC1 is high level, i.e. Rst2 is high level;
There is voltage difference when Scl1 is low level, between Vpp1 and Scl1 and form electric current, the 6PIN of IC2 is made to export 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 be high level;
There is voltage difference when INT2 is low level, between Vpp2 and INT2 and form electric current, the 6PIN of IC3 is made to export 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 be high level;
There is voltage difference when Sda1 is low level, between Vpp1 and Sda1 and form electric current, the 6PIN of IC4 is made to export 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 be high level;
There is voltage difference when Sda2 is low level, between Vpp2 and Sda2 and form electric current, the 6PIN of IC5 is made to export 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 be high level.
The invention has the benefit that
Block signal switching isolation board will be increased between touch screen and testing touch screen plate, make USB switching test plate and touching The electric signal isolation between screen is touched, the ground on the ground and computer that reach touch screen disconnects, and so that touch screen is in suspended state, counts simultaneously Calculation machine and touch screen can normally carry out data transmission again, to achieve the purpose that debugging and test.
Make touch screen under suspended state, debugged using computer with test touch screen, make the debugging and survey of touch screen Examination is more accurate practical, and the parameter of debugging is more matched with terminal practical application, increases 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.
Detailed description of the invention
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 isolation board in Fig. 2 Fig. 1.
In figure,
101, computer;102, the USB interface of computer;103, display interface;104, USB connecting line;105, touch screen Test board;106, the first line;107, touch screen;108, signal converting isolation board;109, the second line.
Specific embodiment
The present invention is described in further detail below by specific embodiment and in conjunction with attached drawing.
As shown in Figure 1, a kind of testing device for touch screens of the embodiment of the present invention, comprising: computer 101, testing touch screen Plate 105, signal converting isolation board 108 and touch screen 107.107 one end of touch screen is connected with the first line 106.Signal converting every It is connected from 108 one end of plate with 106 other end of the first line, 108 other end of signal converting isolation board and 109 one end phase of the second line Even, signal converting isolation board 108 is for the electric signal isolation between testing touch screen plate 105 and touch screen 107.Testing touch screen 105 one end of plate is connected with 109 other end of the second line, and testing touch screen plate 105 is used to acquire and send the number of touch screen 107 According to.Usb 1 02 is provided on computer 101,105 other end of testing touch screen plate passes through USB connecting line 104 and USB interface 102 connect, and debugging routine is loaded in computer 101, and computer 101 is equipped with the display interface 103 for showing tuning parameter, Computer 101 is for being debugged and being tested to touch screen 107.
Original test and debugging system is added in signal converting isolation board 108 by the present invention, makes testing touch screen plate and touching 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.Set on signal converting isolation board 108 there are 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 isolation board 108 is connect by the second line 109 with testing touch screen plate 105 Six road signals be Vpp1, GND1, Rst1, Scl1, Sda1 and INT1 signal, respectively indicate 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 isolation board 108 passes through The six road signals that first line 106 is connect with touch screen 107 are Vpp2, GND2, Rst2, Scl2, Sda2 and INT2 signal, respectively Indicate 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 converter decompression by the 5V power supply of USB interface on testing touch screen plate 105 The power supply of 2.8V-3.6V, the preferably power supply of 3V or so, Vpp2 are by the 4.2V-6V power supply of battery on signal converting isolation board 108 The power supply for being 2.8V-3.6V by DC-DC converter decompression, the preferably power supply of 3V or so.The output current requirements of battery can reach To 100mA or more.
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 Connection, otherwise it is this isolation be nonsensical.
IC1, IC2, IC3, IC4, IC5 are optocouplers, and the optional HCPL260L of model is not limited to that model. HCPL260L includes LVTTL electric level interface device, LVPECL electric level interface device, coupled capacitor C1, bleeder circuit, diode 1N4148 and resistance.Realize LVTTL level arrive LVPECL level conversion device, including LVTTL electric level interface device with LVPECL electric level interface device, further includes: a coupled capacitor C1, for what the LVTTL electric level interface device was exported The LVTTL level signal of 3.3V couples output;One bleeder circuit, for the exchange of output will to be coupled through the coupled capacitor C1 Signal is divided, and is generated the AC signal for meeting LVPECL requirement, is input to the LVPECL interface level device.It can make LVTTL interface level device and the seamed connection of LVPECL interface level device are obtained, and interface conversion chip need not be used.If preceding Grade LVTTL device is 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 connection of signal converting isolation board 108 are as follows:
Vpp1 is connected to the 2PIN of IC1 by current-limiting resistance R1, and the 3PIN of IC1 is connected to Rst1, and the 5PIN of IC1 is connected to GND2, GND2 are the cathode of battery, and the 7PIN and 8PIN of IC1 is connected to Vpp2, and the 6PIN of IC1 is connected to Rst2, meanwhile, IC1 6PIN Vpp2 is connected to by pull-up resistor R11, so that the level of Rst2 is followed the level of Rst1.When Rst1 is low level, There is voltage difference between Vpp1 and Rst1 and form electric current, the 6PIN of IC1 is made to export low level, is 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, exporting the 6PIN of IC1 is high level, i.e. Rst2 For high level.
Vpp1 is connected to the 2PIN of IC2 by current-limiting resistance R2, and the 3PIN of IC2 is connected to Scl1, and the 5PIN of IC2 is connected to The 7PIN and 8PIN of GND2, IC2 are connected to Vpp2, and the 6PIN of IC2 is connected to Scl2, meanwhile, the 6PIN of IC2 passes through pull-up resistor R21 is connected to the level that Vpp2 makes the level of Scl2 follow Scl1.When Scl1 is low level, there is voltage between Vpp1 and Scl1 Difference simultaneously forms electric current, and the 6PIN of IC2 is made to export 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 be high level.
Vpp2 is connected to the 2PIN of IC3 by current-limiting resistance R3, and the 3PIN of IC3 is connected to INT2, and the 5PIN of IC3 is connected to GND1, GND1 are the ground wires of USB interface on testing touch screen plate 105, and the 7PIN and 8PIN of IC3 is connected to Vpp1, the 6PIN of IC3 It is connected to INT1, meanwhile, the 6PIN of IC3, which is connected to Vpp1 by pull-up resistor R31, makes the level of INT1 follow the level of INT2. There is voltage difference when INT2 is low level, between Vpp2 and INT2 and form electric current, so that the 6PIN of IC3 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, makes the 6PIN of IC3 Output is high level, i.e. INT1 is high level.
Vpp1 is connected to the 2PIN of IC4 by current-limiting resistance R4, and the 3PIN of IC4 is connected to Sda1, and the 5PIN of IC4 is connected to The 7PIN and 8PIN of GND2, IC4 are connected to Vpp2, and the 6PIN of IC4 is connected to Sda2, meanwhile, the 6PIN of IC4 passes through pull-up resistor R41 is connected to the level that Vpp2 makes the level of Sda2 follow Sda1.When Sda1 is low level, there is voltage between Vpp1 and Sda1 Difference simultaneously forms electric current, and the 6PIN of IC4 is made to export 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 be high level.
Vpp2 is connected to the 2PIN of IC5 by current-limiting resistance R5, and the 3PIN of IC5 is connected to Sda2, and the 5PIN of IC5 is connected to The 7PIN and 8PIN of GND1, IC5 are connected to Vpp1, and the 6PIN of IC5 is connected to Sda1, meanwhile, the 6PIN of IC5 passes through pull-up resistor R51, which is connected to Vpp1, makes the level of Sda1 be the level for following Sda2.When Sda2 is low level, there is electricity between Vpp2 and Sda2 Pressure difference simultaneously forms electric current, and the 6PIN of IC5 is made to export 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, exporting the 6PIN of IC5 is high level, i.e. Sda1 is high level.
Since Sda1 is OC (opener connects) connection status at testing touch screen plate 105 and touch screen 107 with Sda2, So logical relation can with line and, i.e., two output end (including two or more) direct interconnections can realize " 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, computer 101 and touch screen 107 oneself transmission signal when, touch screen 107 be it is battery powered, make touch screen 107 are in suspended state, at this point, testing touch screen plate 105 is connected with the signal on touch screen 107, (Sda1 and Sda2 can be with Follow mutually) so that computer 101 and touch screen 107 can normally carry out data transmission, to reach the mesh of debugging and test again 's.
It is loaded with debugging routine in computer 101, relies on the debugging circuit board being arranged inside computer 101, debugging electricity Road plate includes microprocessor, decoder, switching value, D/A converting circuit, filter circuit, driving circuit, power amplification circuit, opens Powered-down source circuit and protection circuit, the microprocessor be separately connected decoder, switching value, D/A converting circuit, driving circuit, Power amplification circuit, switching power circuit and protection circuit, switching value connect decoder, decoder be sequentially connected driving circuit, D/A converting circuit, D/A converting circuit connect filter circuit, and filter circuit connects power amplification circuit, voltage power amplification electricity Road connection switch 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 is ok, but at least need to meet the six road signal VDD, GND that will be accessed in the present invention, 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 foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (3)

1. a kind of testing device for touch screens characterized by comprising
Touch screen (107), one end are connected with the first line (106);
Signal converting isolation board (108), 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 isolation 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), one end are connected with the second line (109) other end, the testing touch screen plate (105) for acquiring and sending the data of the touch screen (107);
Computer (101) is provided with USB interface (102), and testing touch screen plate (105) other end passes through USB connection Line (104) is connect with the USB interface (102), and debugging routine is loaded in the computer (101), and the computer (101) is used It is debugged and is tested in touch screen (107);
Wherein, independent power supply Vpp1, Vpp2 and five optocouplers there are two being set on the signal converting isolation board (108) IC1, IC2, IC3, IC4, IC5, first line (106) and second line (109) are six road signal connecting lines, packet Include VDD, GND, RST, SCL, SDA and INT signal;
What the signal converting isolation board (108) was connect by second line (109) with the testing touch screen plate (105) Six road signals are Vpp1, GND1, Rst1, Scl1, Sda1 and INT1 signal, and the signal converting isolation board (108) passes through described The six road signals that first line (106) is connect with the touch screen (107) are Vpp2, GND2, Rst2, Scl2, Sda2 and INT2 Signal;
The circuit connection of the signal converting isolation board (108) are as follows:
Vpp1 is connected to the 2PIN of IC1 by current-limiting resistance R1, and the 3PIN of IC1 is connected to Rst1, and the 5PIN of IC1 is connected to GND2, GND2 are the cathode of battery, and the 7PIN and 8PIN of IC1 is connected to Vpp2, and the 6PIN of IC1 is connected to Rst2, meanwhile, IC1 6PIN Vpp2 is connected to by pull-up resistor R11, so that the level of Rst2 is followed the level of Rst1;
Vpp1 is connected to the 2PIN of IC2 by current-limiting resistance R2, and the 3PIN of IC2 is connected to Scl1, and the 5PIN of IC2 is connected to The 7PIN and 8PIN of GND2, IC2 are connected to Vpp2, and the 6PIN of IC2 is connected to Scl2, meanwhile, the 6PIN of IC2 passes through pull-up resistor R21 is connected to the level that Vpp2 makes the level of Scl2 follow Scl1;
Vpp2 is connected to the 2PIN of IC3 by current-limiting resistance R3, and the 3PIN of IC3 is connected to INT2, and the 5PIN of IC3 is connected to GND1, GND1 are the ground wires of USB interface on the testing touch screen plate (105), and the 7PIN and 8PIN of IC3 is connected to Vpp1, IC3 6PIN be connected to INT1, meanwhile, the 6PIN of IC3, which is connected to Vpp1 by pull-up resistor R31, makes the level of INT1 follow INT2 Level;
Vpp1 is connected to the 2PIN of IC4 by current-limiting resistance R4, and the 3PIN of IC4 is connected to Sda1, and the 5PIN of IC4 is connected to The 7PIN and 8PIN of GND2, IC4 are connected to Vpp2, and the 6PIN of IC4 is connected to Sda2, meanwhile, the 6PIN of IC4 passes through pull-up resistor R41 is connected to the level that Vpp2 makes the level of Sda2 follow Sda1;
Vpp2 is connected to the 2PIN of IC5 by current-limiting resistance R5, and the 3PIN of IC5 is connected to Sda2, and the 5PIN of IC5 is connected to The 7PIN and 8PIN of GND1, IC5 are connected to Vpp1, and the 6PIN of IC5 is connected to Sda1, meanwhile, the 6PIN of IC5 passes through pull-up resistor R51, which is connected to Vpp1, makes the level of Sda1 be the level for following Sda2.
2. testing device for touch screens according to claim 1, which is characterized in that Vpp1 is by the testing touch screen plate (105) power supply that the 5V power supply of USB interface is 2.8V-3.6V by DC-DC converter decompression on, Vpp2 are turned by the signal Connect the power supply that the 4.2V-6V power supply of battery on isolation board (108) is 2.8V-3.6V by DC-DC converter decompression.
3. testing device for touch screens according to claim 1, which is characterized in that
There is voltage difference when Rst1 is low level, between Vpp1 and Rst1 and form electric current, the 6PIN of IC1 is made to export 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 output is high level, i.e. Rst2 is high level;
There is voltage difference when Scl1 is low level, between Vpp1 and Scl1 and form electric current, the 6PIN of IC2 is made to export 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 output is high level, i.e. Scl2 is high level;
There is voltage difference when INT2 is low level, between Vpp2 and INT2 and form electric current, the 6PIN of IC3 is made to export 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 output is high level, i.e. INT1 is high level;
There is voltage difference when Sda1 is low level, between Vpp1 and Sda1 and form electric current, the 6PIN of IC4 is made to export 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 output is high level, i.e. Sda2 is high level;
There is voltage difference when Sda2 is low level, between Vpp2 and Sda2 and form electric current, the 6PIN of IC5 is made to export 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 output is high level, i.e. Sda1 is high level.
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