QT115A-ISG

QT115A-ISG Datasheet

Part	Datasheet
QT115A-ISG	QT115A-ISG (pdf)

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Touch Sensors Design Guide Touch Sensors Design Guide Table of Contents Getting Started Section 1 Introduction To Sensor 1-1 Introduction 1-1 Self-capacitance and Mutual-capacitance Type Sensors 1-1 Dimension Groups 1-2 Some Important Theory 1-2 Section 2 General 2-1 Charge 2-1 2-3 Cs Capacitor 2-3 Series 2-3 Voltage Regulator 2-3 Component Placement 2-3 Materials 2-4 Substrates 2-4 Electrode and Interconnection Materials 2-4 Front Panel 2-5 PCB to Panel Bonding 2-6 Nearby 2-7 Electrostatic Discharge Protection 2-8 Section 3 Self-capacitance Zero-dimensional 3-1 Introduction 3-1 Planar Construction 3-1 Introduction 3-1 Electrode Shapes 3-2 Ground Loading 3-3 Interconnection 3-4 Illumination 3-5 Floating Conductive Items 3-6 Conductive 3-7 Touch Sensors Design Guide Table of Contents Continued Non-planar Construction 3-7 Printed Electrode Method 3-8 Philipp Spring Method 3-8 Secondary Substrate Method 3-9 Ground Loading 3-10 Illumination 3-10 Floating Conductive Items 3-10 Conductive 3-10 Section 4 Mutual-capacitance Zero-dimensional Sensors 4-1 Introduction 4-1 Planar Construction 4-1 Introduction 4-1 X and Y Electrodes 4-2 Ground Loading 4-6 Interconnection 4-7 Illumination 4-9 Floating Conductive Items 4-9 Conductive 4-9 Transparent Y Electrodes 4-9 Non-Planar 4-10 Introduction 4-10 Flooded-X Two-layer Method 4-10 Spring Method 4-12 Adapting the Planar Construction For Distribution Across Two Layers 4-13 Ground Loading 4-13 Illumination 4-13 Floating Conductive Items 4-14 Conductive 4-14 Section 5 Self-capacitance One-dimensional Sensors 5-1 Introduction 5-1 General Advice 5-1 Ground Loading 5-1 Interconnection 5-1 Hand Shadow Effect 5-2 Floating Conductive Items 5-2 Conductive 5-2 Touch Sensors Design Guide Table of Contents Continued Typical Spatially Interpolated Method 5-3 Introduction 5-3 Small Slider Or Wheel 5-3 Medium/Large Slider Or Wheel 5-4 Typical Resistively Interpolated Method 5-6 Introduction 5-6 Medium/Large Slider Or Wheel 5-6 Section 6 Mutual-capacitance One-dimensional 6-1 Introduction 6-1 General Advice 6-1 QMatrix Channels 6-1 Ground Loading 6-1 Floating Conductive Items 6-1 Conductive 6-1 Typical Spatially Interpolated Method 6-2 Introduction 6-2 One-Layer Small Slider Or Wheel 6-2 One-Layer Medium/Large Slider Or Wheel 6-5 Two-Layer Small Slider Or Wheel 6-6 Two-layer Medium/Large Slider Or 6-8 Typical Resistively Interpolated Method 6-10 Introduction 6-10 One-Layer Medium/Large Slider Or Wheel 6-10 Two-Layer Medium/Large Slider Or Wheel 6-11 Glossary of Terms A-1 Touch Sensors Design Guide Touch Sensors Design Guide Getting Started Start by reading the introductory sections in Section 1, paying particular attention to: Section “Self-capacitance and Mutual-capacitance Type Sensors” Section “Dimension Groups” Section “Some Important Theory” Next, read the general advice on sensor design in Section 2: Section “Charge Transfer” Section “Components” Section “Materials” Section “Nearby LEDs” Section “Electrostatic Discharge Protection” Now use the flow diagram below to determine which further sections in this design guide are relevant to your project. Type of Sensor ?   

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Touch Sensors

Design Guide

Touch Sensors Design Guide

Table of Contents

Getting Started

Section 1 Introduction To Sensor 1-1

Introduction 1-1 Self-capacitance and Mutual-capacitance Type Sensors 1-1 Dimension Groups 1-2 Some Important Theory 1-2

Section 2 General 2-1

Charge 2-1 2-3

Cs Capacitor 2-3 Series 2-3 Voltage Regulator 2-3 Component Placement 2-3 Materials 2-4 Substrates 2-4 Electrode and Interconnection Materials 2-4 Front Panel 2-5 PCB to Panel Bonding 2-6 Nearby 2-7 Electrostatic Discharge Protection 2-8

Section 3 Self-capacitance Zero-dimensional 3-1

Introduction 3-1 Planar Construction 3-1

Introduction 3-1 Electrode Shapes 3-2 Ground Loading 3-3 Interconnection 3-4 Illumination 3-5 Floating Conductive Items 3-6 Conductive 3-7

Touch Sensors Design Guide

Table of Contents Continued

Non-planar Construction 3-7 Printed Electrode Method 3-8 Philipp Spring Method 3-8 Secondary Substrate Method 3-9 Ground Loading 3-10 Illumination 3-10 Floating Conductive Items 3-10 Conductive 3-10

Section 4 Mutual-capacitance Zero-dimensional Sensors 4-1

Introduction 4-1 Planar Construction 4-1

Introduction 4-1 X and Y Electrodes 4-2 Ground Loading 4-6 Interconnection 4-7 Illumination 4-9 Floating Conductive Items 4-9 Conductive 4-9 Transparent Y Electrodes 4-9 Non-Planar 4-10 Introduction 4-10 Flooded-X Two-layer Method 4-10 Spring Method 4-12 Adapting the Planar Construction For Distribution Across Two Layers 4-13 Ground Loading 4-13 Illumination 4-13 Floating Conductive Items 4-14 Conductive 4-14

Section 5 Self-capacitance One-dimensional Sensors 5-1

Introduction 5-1 General Advice 5-1

Ground Loading 5-1 Interconnection 5-1 Hand Shadow Effect 5-2 Floating Conductive Items 5-2 Conductive 5-2

Touch Sensors Design Guide

Table of Contents Continued

Typical Spatially Interpolated Method 5-3 Introduction 5-3 Small Slider Or Wheel 5-3 Medium/Large Slider Or Wheel 5-4

Typical Resistively Interpolated Method 5-6 Introduction 5-6 Medium/Large Slider Or Wheel 5-6

Section 6 Mutual-capacitance One-dimensional 6-1

Introduction 6-1 General Advice 6-1

QMatrix Channels 6-1 Ground Loading 6-1 Floating Conductive Items 6-1 Conductive 6-1 Typical Spatially Interpolated Method 6-2 Introduction 6-2 One-Layer Small Slider Or Wheel 6-2 One-Layer Medium/Large Slider Or Wheel 6-5 Two-Layer Small Slider Or Wheel 6-6 Two-layer Medium/Large Slider Or 6-8 Typical Resistively Interpolated Method 6-10 Introduction 6-10 One-Layer Medium/Large Slider Or Wheel 6-10 Two-Layer Medium/Large Slider Or Wheel 6-11

Glossary of Terms A-1

Touch Sensors Design Guide

Touch Sensors Design Guide

Getting Started

Start by reading the introductory sections in Section 1, paying particular attention to:

Section “Self-capacitance and Mutual-capacitance Type Sensors” Section “Dimension Groups” Section “Some Important Theory”

Next, read the general advice on sensor design in Section 2:

Section “Charge Transfer” Section “Components” Section “Materials” Section “Nearby LEDs” Section “Electrostatic Discharge Protection”

Now use the flow diagram below to determine which further sections in this design guide are relevant to your project.

Type of Sensor
? 
 

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Datasheet ID: QT115A-ISG 519432