Cypress CapSense CY8C20x36 Betriebsanweisung

Getting Started with CapSense ® Document No. 001-64846 Rev. *A Cypress Semiconductor 198 Champion Court San Jose, CA 95134-1

10 Document No. 001-64846 Rev. *A Getting Started with CapSense® Figure 2-4. CapSense System Equivalent Model With a finger on the sensor surf

Getting Started with CapSense Document No. 001-64846 Rev. *A 11 Figure 2-5. Output of Sensing Algorithm 2.3.3 CapSense with Sigma Delta Modula

12 Document No. 001-64846 Rev. *A Getting Started with CapSense® Figure 2-7. CSD Equivalent Circuit =× Equation 3 Where: fSWC =

Getting Started with CapSense Document No. 001-64846 Rev. *A 13 Figure 2-9. CSA_EMC Equivalent Circuit The CSA_EMC CapSense algorithm has been

14 Document No. 001-64846 Rev. *A Getting Started with CapSense® 2.4.1 Signal-to-Noise Ratio (SNR) Figure 2-10. Signal and Noise One of the m

Getting Started with CapSense Document No. 001-64846 Rev. *A 15 2.5 Sensor Types Capacitive sensors can be broadly classified into four categor

16 Document No. 001-64846 Rev. *A Getting Started with CapSense® 2.5.1.2 Matrix Buttons In applications requiring a high number of buttons such

Getting Started with CapSense Document No. 001-64846 Rev. *A 17 2.5.2.1 Linear Sliders In a linear slider each CapSense controller I/O pin is co

18 Document No. 001-64846 Rev. *A Getting Started with CapSense® 2.5.2.3 Radial Sliders Radial sliders are similar to linear slider in that fin

Getting Started with CapSense Document No. 001-64846 Rev. *A 19 2.6 Sensor Construction 2.6.1 Field Coupled via Copper Trace (PCB) Figure 2-1

Copyrights 2 Document No. 001-64846 Rev. *A Getting Started with CapSense® Copyrights © Cypress Semiconductor Corporation, 2010-2011. The infor

20 Document No. 001-64846 Rev. *A Getting Started with CapSense® Features of a design based on springs/gaskets/foam:  Electrical field coupled

Getting Started with CapSense Document No. 001-64846 Rev. *A 21 Figure 2-20. LED Sourcing and Sinking Configuration CapSense ControllerVDDCapSens

22 Document No. 001-64846 Rev. *A Getting Started with CapSense® 2.7.1.1.4 LED Fading By gradually changing the duty cycle between LED states y

Getting Started with CapSense Document No. 001-64846 Rev. *A 23 The linear brightness levels are transferred to exponential duty cycle values usi

24 Document No. 001-64846 Rev. *A Getting Started with CapSense® Figure 2-27. Implementing LCD Feedback with CapSense using PSoC 2.7.2 Haptic

Getting Started with CapSense Document No. 001-64846 Rev. *A 25 Figure 2-29. PWM Clock Divider Calculation To calculate the clock dividers to ob

26 Document No. 001-64846 Rev. *A Getting Started with CapSense® Table 2-2. Scan Speed versus VC1 Divider Scanning Speed VC1 Ultra fast 1 Fast

Getting Started with CapSense Document No. 001-64846 Rev. *A 27 2.8 CapSense System Overview CapSense solutions include not only the CapSense d

28 Document No. 001-64846 Rev. *A Getting Started with CapSense® Devices from the CapSense Express family are fully configurable and do not requ

Getting Started with CapSense Document No. 001-64846 Rev. *A 29 3. Design Considerations When designing capacitive touch sense technology into

Getting Started with CapSense Document No. 001-64846 Rev. *A 3 Contents 1. Introduction ...

30 Document No. 001-64846 Rev. *A Getting Started with CapSense® 3.1.2 Bonding Overlay to PCB Since the dielectric constant of air is very low

Getting Started with CapSense Document No. 001-64846 Rev. *A 31 3.2.2 Redirect If your product is densely packed, it may not be possible to pre

32 Document No. 001-64846 Rev. *A Getting Started with CapSense® A more effective method is to provide special purpose ESD protection devices on

Getting Started with CapSense Document No. 001-64846 Rev. *A 33 3.3.1.2.1 CapSense Input Lines The recommended series resistance for CapSense in

34 Document No. 001-64846 Rev. *A Getting Started with CapSense® In Figure 3-6, two sensors are surrounded by a ground plane that is connected t

Getting Started with CapSense Document No. 001-64846 Rev. *A 35 3.3.1.5 RF Source Location When systems like computer monitors or digital photo

36 Document No. 001-64846 Rev. *A Getting Started with CapSense® 3.3.3 Conducted Immunity and Emissions Noise current generated by high freque

Getting Started with CapSense Document No. 001-64846 Rev. *A 37 3.4 Software Filtering Software filters are one of the techniques for dealing w

38 Document No. 001-64846 Rev. *A Getting Started with CapSense® Figure 3-12. Average Filter Noise (16 Samples) Figure 3-13. Average Filter Fi

Getting Started with CapSense Document No. 001-64846 Rev. *A 39 3.4.2 IIR Filter Infinite Impulse Response filters (IIR) produce a step respons

4 Document No. 001-64846 Rev. *A Getting Started with CapSense® 3. Design Considerations ...

40 Document No. 001-64846 Rev. *A Getting Started with CapSense® Figure 3-16. IIR Filter Finger Touch For more information about how to impleme

Getting Started with CapSense Document No. 001-64846 Rev. *A 41 Figure 3-17. Median Filter Noise Spike Figure 3-18. Median Filter (16-sample) Fi

42 Document No. 001-64846 Rev. *A Getting Started with CapSense® 3.4.4 Jitter Filter 3.4.4.1 Jitter Filter for Noisy Slider Data The centroid

Getting Started with CapSense Document No. 001-64846 Rev. *A 43 Figure 3-20. Jitter Filter for Button Noise Figure 3-21. Jitter Filter for Butto

44 Document No. 001-64846 Rev. *A Getting Started with CapSense® 3.4.5 Event Based Filter Event-based filters involve a special filtering meth

Getting Started with CapSense Document No. 001-64846 Rev. *A 45 The average current consumed by the device over a long time period can be calcula

46 Document No. 001-64846 Rev. *A Getting Started with CapSense® 3.6 Pin Assignments An effective method to reduce interaction between CapSens

Getting Started with CapSense Document No. 001-64846 Rev. *A 47 Figure 3-24. NOT Recommended: Port Isolation for Communication, CapSense, and LED

48 Document No. 001-64846 Rev. *A Getting Started with CapSense® 3.7 PCB Layout Guidelines In the typical CapSense application, the capacitive

Getting Started with CapSense Document No. 001-64846 Rev. *A 49 3.7.4 Button Design The best shape for buttons is round. Rectangular shapes wit

Getting Started with CapSense Document No. 001-64846 Rev. *A 5 6.2 CY8C21x34/B / CY8C24x94 to CY8C20xx6A/H ...

50 Document No. 001-64846 Rev. *A Getting Started with CapSense® 3.7.6 Sensor and Device Placement Minimize trace length from CapSense control

Getting Started with CapSense Document No. 001-64846 Rev. *A 51 3.7.9 Crosstalk Solutions A common backlighting technique for panels is to moun

52 Document No. 001-64846 Rev. *A Getting Started with CapSense® 3.7.10 Vias Use the minimum number of vias to route CapSense inputs to minimi

Getting Started with CapSense Document No. 001-64846 Rev. *A 53 Figure 3-35. Recommended Button and Slider Layout Bottom Layer 3.7.12 Shield E

54 Document No. 001-64846 Rev. *A Getting Started with CapSense® Providing a large shield plane on the PCB sometimes invites radiated emission i

Getting Started with CapSense Document No. 001-64846 Rev. *A 55 4. CapSense Product Portfolio Cypress’s CapSense Controller solutions are bas

56 Document No. 001-64846 Rev. *A Getting Started with CapSense® 4.1.3 CapSense Plus (Programmable Solutions) Figure 4-1 CapSense Plus CapSen

Getting Started with CapSense Document No. 001-64846 Rev. *A 57 5. CapSense Selector Guide 5.1 Selecting the Right CapSense Device Several

58 Document No. 001-64846 Rev. *A Getting Started with CapSense® Figure 5-1 Device Selection Tree CapSense Family PortfolioCY8CMBR2044, CY8C201x

Getting Started with CapSense Document No. 001-64846 Rev. *A 59 Table 5-1. CapSense Key Features by Product Family CY8CMBR2044 CY8C201xx CY8C21x3

6 Document No. 001-64846 Rev. *A Getting Started with CapSense® 1. Introduction 1.1 How to Use This Guide This document is the starting poi

60 Document No. 001-64846 Rev. *A Getting Started with CapSense® 6. CapSense Migration Paths As a system evolves, it may require a CapSense

Getting Started with CapSense Document No. 001-64846 Rev. *A 61 6.4 Pin-to-Pin Compatibility When migrating from one device to another, no PCB

62 Document No. 001-64846 Rev. *A Getting Started with CapSense® 7. Resources 7.1 Website At the Cypress CapSense Controllers website you

Getting Started with CapSense Document No. 001-64846 Rev. *A 63 7.4.2 Universal CapSense Module Boards 7.4.2.1 Simple Button Module Board The

64 Document No. 001-64846 Rev. *A Getting Started with CapSense® 7.4.6 In-Circuit Emulation (ICE) Kits The ICE pod provides the interconnectio

Getting Started with CapSense Document No. 001-64846 Rev. *A 65 7.7 PSoC Programmer PSoC Programmer is a flexible, integrated programming appli

66 Document No. 001-64846 Rev. *A Getting Started with CapSense® 7.9 PSoC Designer Cypress offers an exclusive Integrated Design Environment,

Getting Started with CapSense Document No. 001-64846 Rev. *A 7 1.3 Document Revision History Revision Issue Date Origin of Change Descriptio

8 Document No. 001-64846 Rev. *A Getting Started with CapSense® 2. CapSense Technology Cypress’s CapSense controllers use changes in capacita

Getting Started with CapSense Document No. 001-64846 Rev. *A 9 2.1.2 Mutual Capacitance Mutual capacitance uses a pair of pins and measures the