Description
OS-FLASH-A2Q-S Industrial control panel
OS-FLASH-A2Q-S Industrial control panel
Module Clips Drive controller servo moto
OS-FLASH-A2Q-S Industrial control panelSuitable for steel manufacturing, thermal power generation, hydroelectric power generation, nuclear power generation, wind power generation, gas supply, and other glass manufacturing, paper mills, mechanical manufacturing, electronic manufacturing, automotive manufacturing, aviation manufacturing, chemical manufacturing, coal mining and selection, oil and natural gas mining and selection, metal mining and selection, and non-metallic mining and selection
Detailed explanation of the design challenges of multi-point capacitive touch screens
Multi- contact capacitive touch screens have and are continuing to change the way people interact with handheld devices and bring many new operating experiences to people. From mobile phones to e-books, electronic writing pads, navigators, electronic game consoles and laptops, all have abandoned the original touch buttons and are competing to choose multi-point capacitive touch screens for human-computer interaction. In particular, the emergence of I-Phone and I-Pad has made multi-point capacitive touch screens deeply rooted in the hearts of the people. However, the design of multi-point capacitive touch screens is not easy and readily available. Strictly speaking, multi-point capacitive touch screen technology is not a fully mature technology. It is still a technology in the development stage and is constantly being developed and improved. For designers of multi-point capacitive touch screens, they still face many design challenges. This article introduces the design challenges of multi-point capacitive touch screen design and how to use TTSP solutions to help designers face these challenges, making multi-point capacitive touch screen design easier than ever.
design challenge
Design challenge one
The first challenge from multi-point capacitive touch screen design is how to convert the small mutual capacitance changes due to finger touch into digital signals with sufficient resolution. We know that, generally speaking, multi-touch is based on the principle of mutual capacitance sensing, and mutual capacitance is the parasitic capacitance at the intersection of the transmitting sensing strip and the receiving sensing strip. This capacitance is very small, usually 0.2~4pF, and The change in mutual capacitance caused by finger touch is even smaller. The detection of such tiny mutual capacitance changes not only requires a hardware detection circuit that is highly sensitive to capacitance changes to convert weak analog power into digital signals, but also requires corresponding software for control and coordination to ensure that the entire touch screen Each point has high enough sensitivity to finger touch signals.
Design challenge two
How to obtain a fast enough scan time is the second challenge in multi-point capacitive touch screen design. For a single-point touch screen with M rows and N columns of sensing strips, using self-capacitance scanning, it only needs to scan M rows and N columns separately to calculate and locate the coordinates of the finger on the touch screen based on the signals of each row and column. . The number of times it scans the sensor strip is M+N times. When you use multi-contact mutual capacitance scanning, since it must be scanned at the intersection of rows and columns, the number of scans is the number of MXN scans at the intersection. For a 3.2-inch screen with 10 rows and 20 columns, self-capacitance scanning only requires 10+20=30 times, while mutual capacitance scanning requires 10X20=200 times. As the size of the touch screen becomes larger and larger, the number of scans increases faster and faster. In order for users to have a better touch experience, it needs to scan the screen at least 50 times per second. This means that the scanning and data processing time of each point must be less than 100us, so as to ensure a fast enough response time. When the size of the touch screen is larger, the number of rows and columns will be larger, and this time will be shorter.
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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
