Description
XVH-340-57CAN-1-1V Eaton touch screen
XVH-340-57CAN-1-1V Eaton touch screen
Module Clips Drive controller servo motor
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When a finger touches the screen, the two conductive layers that are usually insulated from each other come into contact at the touch point. Because one of the conductive layers is connected to a 5V uniform voltage field in the Y-axis direction, the voltage of the detection layer changes from zero to Non-zero, after the controller detects this connection, it performs A/D conversion and compares the obtained voltage value with 5V to obtain the Y-axis coordinate of the touch point. In the same way, the X-axis coordinate is obtained. This is The most basic principle common to all resistive technology touch screens.
The key to resistive touch screens lies in material technology. Commonly used transparent conductive coating materials are:
①ITO, indium oxide, weak conductor, the characteristic is that when the thickness drops below 1800 angstroms (angstroms = 10-10 meters), it will suddenly become transparent, with a light transmittance of 80%. The transmittance decreases as it gets thinner, and rises to 80% when the thickness reaches 300 angstroms. ITO is the main material used in all resistive technology touch screens and capacitive technology touch screens. In fact, the working surface of resistive and capacitive technology touch screens is the ITO coating.
② Nickel-gold coating, the outer conductive layer of the five-wire resistive touch screen uses a nickel-gold coating material with good ductility. Due to frequent touching, the purpose of using a nickel-gold material with good ductility for the outer conductive layer is to extend the service life. However, the process cost is relatively high. Although the nickel-gold conductive layer has good ductility, it can only be used as a transparent conductor and is not suitable as a working surface for a resistive touch screen. Because it has high conductivity and the metal is not easy to achieve a very uniform thickness, it is not suitable for use as a voltage distribution layer and can only be used as a detector. layer.
Five-wire resistive touch screen:
The base layer of the five-wire resistive technology touch screen adds voltage fields in both directions to the conductive working surface of the glass through a precision resistor network. We can simply understand that the voltage fields in both directions are added to the conductive working surface in a time-sharing manner. On the same working surface, the outer nickel-gold conductive layer is only used as a pure conductor. There is a method of timely detecting the X-axis and Y-axis voltage values of the inner ITO contact point after touching to measure the position of the touch point. The five-wire resistive touch screen requires four leads in the inner layer of ITO, and only one conductor in the outer layer. The touch screen has a total of 5 leads. The structure of the five-wire resistive touch screen is shown in Figure 6-5
Figure 6-5 Structure of five-wire touch screen
Disadvantages of the four-wire resistive touch screen:
The B side of the resistive touch screen needs to be touched frequently. The B side of the four-wire resistive touch screen uses ITO. We know that ITO is an extremely thin oxidized metal. During use, small particles will soon form. Once a crack occurs, the current flowing there is forced to go around the crack, and the voltage that should be evenly distributed is destroyed, and the touch screen is damaged, which is manifested as inaccurate crack placement.
Figure 6-6 Cracks in the four-wire touch screen lead to shunting
As the cracks intensify and increase, the touch screen will gradually fail. Therefore, the short service life is the main problem of the four-wire resistive touch screen.
Improvements of the five-wire resistive touch screen:
First, the A side of the five-wire resistive touch screen is conductive glass instead of a conductive coating. The conductive glass process greatly improves the life of the A side and can increase the light transmittance.
Secondly, the five-wire resistive touch screen assigns all the tasks of the working surface to the long-life A side, while the B side is only used as a conductor, and uses a nickel-gold transparent conductive layer with good ductility and low resistivity. Therefore, the B side Life span is also greatly improved.
Another proprietary technology of the five-wire resistive touch screen is to use a precision resistor network to correct the linearity problem on the A side: due to the inevitable uneven thickness of the process engineering, which may cause uneven distribution of the voltage field, the precision resistor network flows during operation. It passes most of the current, so it can compensate for the possible linear distortion of the working surface.
The five-wire resistive touch screen is currently the best resistive technology touch screen and is most suitable for use in the military and medical fields.
However, the four-wire resistive touch screen is used in general fields due to its low price. The following will explain in detail the work and measurement process of the entire touch screen circuit in conjunction with the built-in touch screen controller of S3C2410 .
The following figure is the equivalent circuit when measuring a four-wire resistive touch screen (Figure 6-7):
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1.Has been engaged in industrial control industry for a long time, with a large number of inventories.
2.Industry leading, price advantage, quality assurance
3.Diversified models and products, and all kinds of rare and discontinued products
4.15 days free replacement for quality problems
ABB — AC 800M controller, Bailey, PM866 controller, IGCT silicon controlled 5SHY 3BHB01 3BHE00 3HNA00 DSQC series
BENTLY — 3500 system/proximitor, front and rear card, sensor, probe, cable 3500/20 3500/61 3500/05-01-02-00-001 3500/40M 176449-01 3500/22M 138607-01
Emerson — modbus card, power panel, controller, power supply, base, power module, switch 1C31,5X00, CE400, A6500-UM, SE3008,1B300,1X00,
EPRO — PR6423 PR6424 PR6425 PR6426 PR9376 PR9268 Data acquisition module, probe, speed sensor, vibration sensor
FOXBORO — FCP270 FCP280 FCM10EF FBM207 P0914TD CP40B FBI10E FBM02 FBM202 FBM207B P0400HE Thermal resistance input/output module, power module, communication module, cable, controller, switch
GE —- IS200/215/220/230/420 DS200/215 IC693/695/697/698 VMICPCI VMIVME 369-HI-R-M-0-0-E 469 module, air switch, I/O module, display, CPU module, power module, converter, CPU board, Ethernet module, integrated protection device, power module, gas turbine card
HIMA — F3 AIO 8/4 01 F3231 F8627X Z7116 F8621A 984862160 F3236 F6217 F7553 DI module, processor module, AI card, pulse encoder
Honeywell — Secure digital output card, program module, analog input card, CPU module, FIM card
MOOG — D136-001-007 Servo valve, controller, module
NI — SCXI-1100 PCI – PXIE – PCIE – SBRIO – CFP-AO-210 USB-6525 Information Acquisition Card, PXI Module, Card
Westinghouse — RTD thermal resistance input module, AI/AO/DI/DO module, power module, control module, base module
Woodward — 9907-164 5466-258 8200-1300 9907-149 9907-838 EASYGEN-3500-5/P2 8440-2145 Regulator, module, controller, governor
YOKOGAWA – Servo module, control cabinet node unit
Main products:
PLC, DCS, CPU module, communication module, input/output module (AI/AO/DI/DO), power module, silicon controlled module, terminal module, PXI module, servo drive, servo motor, industrial display screen, industrial keyboard, controller, encoder, regulator, sensor, I/O board, counting board, optical fiber interface board, acquisition card, gas turbine card, FIM card and other automatic spare parts
