Cypress CapSense CY8C20x36 Betriebsanweisung PDF herunterladen (Seite 3)

Getting Started with CapSense

Document No. 001-64846 Rev. *I 3

Contents

1. Introduction .................................................................................................................................................................... 6

1.1 How to Use This Guide .......................................................................................................................................... 6

1.2 Cypress‘s CapSense Documentation Ecosystem .................................................................................................. 6

1.3 Cypress CapSense Products................................................................................................................................. 8

1.3.1 Cypress CapSense Differentiation ............................................................................................................ 8

1.4 Document Conventions ......................................................................................................................................... 9

2. CapSense Technology ................................................................................................................................................ 10

2.1 Capacitive Sensing Methods ............................................................................................................................... 10

2.1.1 Self-Capacitance .................................................................................................................................... 10

2.1.2 Mutual-Capacitance ................................................................................................................................ 11

2.2 Self-Capacitance Equivalent Model ..................................................................................................................... 11

2.3 CapSense Sensing Technology .......................................................................................................................... 12

2.3.1 Sensing Methods .................................................................................................................................... 12

2.3.2 Capacitance Conversion ......................................................................................................................... 12

2.3.3 CapSense with Sigma Delta Modulator (CSD) ....................................................................................... 13

2.3.4 CapSense Successive Approximation Electromagnetic Compatible (CSA_EMC) .................................. 14

2.4 CapSense Tuning ................................................................................................................................................ 15

2.4.1 Definitions ............................................................................................................................................... 15

2.4.2 Signal-to-Noise Ratio (SNR) ................................................................................................................... 16

2.4.3 Measuring SNR ...................................................................................................................................... 16

2.4.4 SmartSense Auto-Tuning ....................................................................................................................... 17

2.4.5 SmartSense_EMC (SmartSense Electromagnetic Compatible) ............................................................. 18

2.5 Sensor Types ...................................................................................................................................................... 19

2.5.1 Buttons (Zero-Dimensional Sensors) ...................................................................................................... 19

2.5.2 Sliders (One-Dimensional Sensors)........................................................................................................ 20

2.5.3 Touchscreens and Trackpads (Two-Dimensional Sensors) ................................................................... 22

2.5.4 Proximity (Three-dimensional Sensors) .................................................................................................. 22

2.6 Sensor Construction ............................................................................................................................................ 23

2.6.1 Field Coupled via Copper Trace (PCB) .................................................................................................. 23

2.6.2 Field Coupled via Spring/Gasket/Foam .................................................................................................. 23

2.6.3 Field Coupled via Printed Ink .................................................................................................................. 24

2.6.4 Field Coupled via ITO Film on Glass ...................................................................................................... 24

2.7 User Interface Feedback ..................................................................................................................................... 24

2.7.1 Visual Feedback ..................................................................................................................................... 24

2.7.2 Haptic Feedback ..................................................................................................................................... 28

2.7.3 Audible Feedback ................................................................................................................................... 29

1 2 3 4 5 6 7 8 ... 74 75

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