Capacitive touch screen is a layer of transparent special metal conductive material pasted on the glass surface. The double glass of the capacitive touch screen can not only protect the conductor and the sensor, but also effectively prevent the external environmental factors from affecting the touch screen. Even if the screen is stained with dirt, dust or oil stains, the capacitive touch screen can still accurately calculate the touch position. Because the capacitance varies with temperature, humidity, or grounding conditions, its stability is poor, and drift often occurs. This kind of touch screen is suitable for the debugging stage of system development.
1. Introduction of Cypress TrueTouch capacitive touch screen solution
Cypress Semiconductor manufactures high-performance IC products for data transmission, telecommunications, PCs, and military systems. The company was established in 1982 and is an international company. There are currently about 3,000 people, and a sales network has been established around the world. The company is headquartered in San Jose, California. Cypress provides high-performance solutions for the core components of consumer electronics, computing, data communications, automotive, industrial, and solar systems. Cypress is committed to customer service, making full use of product performance-based processes and manufacturing expertise to expand its product range to wired and wireless USB devices, CMOS image sensors, timing technology solutions, network search engines, professional memory, high-end Bandwidth synchronization and micro-power memory products, optical solutions, and reconfigurable mixed signal arrays.
Cypress PSoC technology integrates programmable analog / digital resources on a single chip, providing TrueTouch â„¢ solutions for inductive capacitive touch screens, which covers everything from single-touch, multi-touch gesture recognition to multi-touch recognition field. With the efficient and flexible PSoC Designer 5.0 development environment, the Cypress TrueTouch? Solution is gaining widespread application in the industry.
PSoC series single-chip microcomputer is a PSoC block that integrates a configurable analog and digital peripheral device array PSoC block around a proprietary MCU (Microprogrammed Control Unit) core, using the programmable interconnect array inside the chip to effectively configure the analog and digital blocks on the chip Resources to achieve the purpose of a programmable system on chip. PSoC is a device with equal high applicability to standard “all-digital†microcontroller design, pure analog design, and all designs in between. A completely new generation device with fully programmable mixed signal SOC basic principles.
Figure 1 is a graph of the axis coordinate sensing unit matrix commonly used in the Cypress TrueTouch solution. Similar to a touch panel, the independent ITO sensing units can be connected in series to form a Y-axis or X-axis sensing unit, and row sensing units form Y The axis and column sensing units form the X axis, and the rows and columns are on separate layers. The multi-touch recognition position method is a touch detection method based on mutual capacitance (a drive excitation signal is added to the row unit, and induction is performed on the column unit, which is different from the self-capacitance method of the same induction unit that is different from excitation and induction). The detection of touch gestures includes recognizing the positions where 10 fingers of both hands touch simultaneously (Figure 2). It can completely eliminate the "ghost point" through mutual capacitance detection. When there are multiple touch points, only when the row sensing unit where a touch point is located is driven, and the column sensing unit is detected, there will be capacitance change detection Value so that the absolute position of the touch point at the intersection of multiple rows / columns can be detected.
Fig.1 Graph of the matrix of the axis coordinate sensor unit
Figure 2 Cypress TrueTouch multi-touch recognition position
The scheme also shows the location of 5 finger touch points.
Figure 3 shows the different applications of the Cypress TrueTouch solution, including touch buttons, two-finger gesture operation of images, and simultaneous recognition of multi-touch positions and control of multiple targets.
Figure 3 Cypress TrueTouch capacitive touch screen solution
2. Communication interface of Cypress TrueTouch capacitive touch screen
Cypress TrueTouch capacitive touch screen mainly realizes physical communication with the host through TX / I2C / SPI / USB. The TrueTouch chip can directly report some basic gestures (such as two-point touch translation / zoom / rotation), and can also provide a dedicated API to users and users. After obtaining multi-point coordinates, the terminal can recognize more or custom gestures through API operations. The API is written in standard C and can run on multiple platforms such as 51 / ARM, which greatly simplifies the workload of user-side software development.
Communication interface (communicaTIon interface) refers to the interface between the central processor and the standard communication subsystem. Such as: RS232 interface. The RS232 interface is a serial port. The 9-pin socket on the back of the computer case is generally marked with "| O | O |". The data transmission between the computer and the computer or between the computer and the terminal can adopt two methods of serial communication and parallel communication. The serial communication method is widely used because it has few lines and low cost, especially in remote transmission, which avoids the inconsistency of the characteristics of multiple lines. In serial communication, both sides of the communication are required to use a standard interface, so that different devices can be easily connected to communicate.
1. TX communication interface
Cypress Designer 5.0 provides the TX8SW user module, which can implement software serial interfaces in 7 / 8-bit RS-232 format, supporting transmission speeds of 115200, 57600, 38400, 19200, 9600, 4800, 2400, and 1200 bps. The user can set the corresponding I / O port, baud rate, polarity and stop digits in the code. The TX8SW interface does not occupy PSoC's digital / analog module resources, and provides a one-way communication connection from PSoC to the host.
|
Nominal Diameter (mm) |
Diameter Tolerance (mm) | Tensile strenght (Mpa) | Yield strenght (Mpa) | Elong.at max.force | Bending number 180o |
| 4 | ±0.04 | 1470 | 1290 | 3.50% | 4 |
| 4.8 | 1570 | 1380 | |||
| 5.00 | ±0.05 | 1670 | 1470 | ||
| 1770 | 1560 | ||||
| 1860 | 1640 | ||||
| 6.00 | 1470 | 1470 | |||
| 6.25 | 1570 | 1570 | |||
| 7.00 | 1670 | 1670 | |||
| 7.50 | 1770 | 1770 | |||
| 1860 | 1860 | ||||
| 8.00 | ±0.06 | ||||
| 9.00 | 1470 | 1470 | |||
| 9.50 | 1570 | 1570 | |||
| 10.00 | 1670 | 1670 | |||
| 11.00 | 1470 | 1290 | |||
| 12.00 | 1570 | 1380 |
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