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PCB-v.基于电容性触摸感 应 用SN8P2522

PCB-v.基于电容性触摸感 应 用SN8P2522. SONiX Technology Co., Ltd. 介绍. Introduction to Capacitive Touch Sensing SN8P2522 电容触摸感应系统 X-touch™ 触摸键开发工具 按钮 , Scroll Pads and Sliders 演示. Agenda. Introduction to Capacitive Touch Sensing Application of Touch Sensing Overview of Touch Sensing

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PCB-v.基于电容性触摸感 应 用SN8P2522

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  1. PCB-v.基于电容性触摸感应用SN8P2522 SONiX Technology Co., Ltd

  2. 介绍 • Introduction to Capacitive Touch Sensing • SN8P2522 电容触摸感应系统 • X-touch™ 触摸键开发工具 • 按钮, Scroll Pads and Sliders 演示

  3. Agenda • Introduction to Capacitive Touch Sensing • Application of Touch Sensing • Overview of Touch Sensing • Basic Touch Sensor Construction • Basic Principle of Operation

  4. Introduction to Capacitive Touch Sensing- Applications of Touch Sensing • Alternative to Mechanical Switches • Low cost / Longer life • Flexible User Interface • Buttons / Sliders • Adaptable • Used in • Consumer electronics • Residential control • Appliances • …and almost anywhere a switch is currently used!

  5. Introduction to Capacitive Touch Sensing- Overview of Touch Sensing • Optical • Expensive • Complex system design • Resistive • Require sensor material that changes R when touched. • Relatively low cost, but wear and tear, and ESD problems • Capacitive • To be implemented on PCB directly • Flexible sensor size and shape

  6. Introduction to Capacitive Touch Sensing- Basic Touch Sensor Construction • Copper Sensor Pad • Circle: D~10mm • Square: 12.7mm x12.7mm • PCB • Std. Thickness: ~1.6mm • Cover Plate • Non-conductive material

  7. Introduction to Capacitive Touch Sensing- Basic Principle of Operation • Finger introduces additional ground path

  8. Introduction to Capacitive Touch Sensing- Cont. • Equivalent Circuit

  9. Agenda • SN8P2522 Capacitive Touch Sensing System • System Features • System Description • System Software Description • System Application

  10. SN8P2522 Capacitive Touch Sensing System- System Features. • ROM/RAM Size: 2K/128Byte • Low Working Voltage: 2.2V~5.5V • Build-in SPI Interface • Style of Capacitive Touch Pad • Single Touch Buttons (Max. 8Keys) • Matrix Touch Buttons (Max. 36Keys) • Single Touch Slider Pads (Max. 7-bit resolution) • Matrix Touch Slider Pads (Max. 8-bit resolution) • High Reliability (Temperature, Humidity, Waterproof, ESD, EFT, EMI….) • Low Current Consumption • At Fcpu = 1MHz, typical 10/sec scan rate: 32uA @5V, 13uA @3V. • Standby Current < 1uA （Wake-up by P0/P1）

  11. SN8P2522 Capacitive Touch Sensing System- System Description. • The main components of the system are: - Sensor pads - Detecting engine of CapSensing - Signal processing stage • SN8_Buttons_code.Lib • SN8_Sliders_code.Lib - SPI interface

  12. SN8P2522 Capacitive Touch Sensing System- System Software Description. • Software architecture model • User can create files: • System_Config.asm • User_defined_ram.asm • User_code.asm

  13. SN8P2522 Capacitive Touch Sensing System- Cont. • System_Config. asm • Define pins of touch key • P1_direct_key register • P1_slider_key register • Set capacitive sensor parameters • Num_sen_line register • Key_threshold register • Average_num register • Set system operation parameters • Sampling frequency setting register • Resistor of oscilator setting register • Measure periodic number setting register • De-bounce time setting register • User_code. asm • Key_status register • New_pos register • User_defined_ram. asm

  14. SN8P2522 Capacitive Touch Sensing System- System Application. • Application Circuit: • Scan Rate: Typical 5ms per channel. • 8 Direct key: 40ms (typ.), 4x4 Matrix key: 40ms (typ.)… • Sample rate depends on “Channel number”, not “Keys number”.

  15. SN8P2522 Capacitive Touch Sensing System- Cont. • Standard PAD Shape: Circle or Square. • PAD pitch: > 4.7mm. • PAD Area & Overlay Thickness • Overlay Material :Acrylic • PAD Shape: Circle • Conductive material cannot be as overlay • Assembly

  16. Agenda • X-touch™ Touch Key Development Tool • Overview

  17. X-touch™ Touch Key Development Tool - Overview • X-touch Development Software displays and adjusts capacitive touch key parameters.

  18. X-touch™ Touch Key Development Tool- Cont. • X-touch Demo Board includes 6 direct keys, 6 PADs Scroll and 5-bit Slider

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