Cypress CapSense CY8C20x36 Guia do Utilizador Página 24
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24 Document No. 001-64846 Rev. *I Getting Started with CapSense
®
Features of a design based on springs/gaskets/foam:
Electrical field coupled from PCB to overlay using a compressed spring, or conductive gasket or foam
Conductive material itself acts as capacitive sensor pad
No mechanical moving parts. Springs and foam do not move
Coupled to touch sensor surface through nonconductive overlay
Any conductive overlay serves as the button touch surface
Ideal topology for curved, sloping, or otherwise irregular front panels
Ideal for designs where touch sensor surface is physically separated from silicon or mother board
Ideal for designs where CapSense and mechanical button combination is desired
For more information on springs, see Appendix A: Springs.
2.6.3 Field Coupled via Printed Ink
Features of a design based on printed ink:
Electric field coupled with printed patterns on a flexible substrate using conductive ink
High series resistance due to higher ohms-per-square of printed ink compared to copper
High parasitic capacitance due to thin PCB
No mechanical moving parts, but substrate is flexible
Coupled to touch sensor surface with a nonconductive overlay
Ideal topology for flexible front panels
Flexible PCB can be one-layer or two-layer film
2.6.4 Field Coupled via ITO Film on Glass
Features of a design based on ITO film:
Electric field coupled with printed or deposited patterns on glass
Higher series resistance of ITO films compared to copper and printed ink
No mechanical moving parts
Ideal topology for graphical front panels
2.7 User Interface Feedback
Effective user interface designs include some feedbacks to the user when they are using the capacitive touch sense
buttons. There are various forms of feedback, including visual, audio, and haptic (tactile). Depending on the user
interface design, multiple types of feedback can be used in combination.
2.7.1 Visual Feedback
LEDs and LCDs provide visual feedback.
2.7.1.1 LED-based Visual Feedback
Visual feedback is widely used in user interfaces. LEDs are used to indicate the status of buttons, sliders, and
proximity sensors. LEDs can implement different effects when the sensor status changes.
2.7.1.1.1 LED ON/OFF
In visual feedback‘s simplest form, LEDs are turned ON or OFF in response to a finger touch. General-purpose I/Os
are used to drive LEDs in either a sourcing or sinking configuration, as shown in Figure 2-21.
- Getting Started with CapSense 1
- Contents 3
- 1. Introduction 6
- 1.4 Document Conventions 9
- 2. CapSense Technology 10
- 2.1.2 Mutual-Capacitance 11
- 2.3.1 Sensing Methods 12
- CY8C21x34/B 13
- = External Connection 14
- 2.4 CapSense Tuning 15
- 2.4.3 Measuring SNR 16
- 2.4.4.1 What is SmartSense? 17
- 2.5 Sensor Types 19
- 2.5.1.2 Matrix Buttons 20
- 2.5.2.1 Linear Sliders 20
- 2.5.2.2 Diplexed Sliders 21
- Area contacted by finger 22
- Proximity Sensor 22
- 2.6 Sensor Construction 23
- 2.7.1 Visual Feedback 24
- OFFON OFF 26
- 2.7.2 Haptic Feedback 28
- 2.7.3 Audible Feedback 29
- 2.8 Water Tolerance 31
- CapSense Controller 32
- 3. Design Considerations 33
- 3.2 ESD Protection 34
- Non Conductive 35
- Material 35
- 3.2.2 Redirect 36
- 3.2.3 Clamp 36
- 3.3.1.1 Ground Plane 37
- 3.3.1.2 Series Resistor 37
- 3.3.1.3 Trace Length 37
- 3.3.1.4 Current Loop Area 37
- CapSense 38
- Controller 38
- 3.3.2 Radiated Emissions 39
- 3.4 Software Filtering 41
- 3.4.2 IIR Filter 42
- Equation 18 43
- 3.4.3 Median Filter 44
- 3.4.4 Jitter Filter 45
- Unfiltered 46
- Filtered 46
- 3.5 Power Consumption 47
- 3.6 Pin Assignments 48
- 3.7 PCB Layout Guidelines 51
- 3.7.5 Slider Design 52
- 3.7.8 Trace Routing 53
- 3.7.9 Crosstalk Solutions 53
- 3.7.10 Vias 54
- 3.7.11 Ground Plane 54
- Sensor-1 55
- Shield Electrode 56
- Guard Sensor 56
- Sensor Pads 56
- 4.1.1.1 CY8CMBR20xx 57
- 4.1.1.2 CY8C201xx 57
- 4.1.2.1 CY8C20x34, CapSense 57
- 5. CapSense Selector Guide 59
- Design Requirements 60
- 7. Resources 65
- 7.4.5 Evaluation Pods 66
- 7.5 Demonstration Kit 67
- 7.6 PSoC Designer 67
- 7.7 PSoC Programmer 68
- C-to-USB Bridge Kit 69
- 7.10 Design Support 71
- 8. Appendix 72
- Introduced Capacitance, pF 73
- 8.1.4 Design Examples 74
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