QT100-ISG

QT100-ISG Datasheet

QT100 CHARGE-TRANSFER QTOUCH IC

Part	Datasheet
QT100-ISG	QT100-ISG (pdf)

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QT100 CHARGE-TRANSFER QTOUCH IC The QT100 charge-transfer ‘QT’ touch sensor is a self-contained digital IC capable of detecting near-proximity or touch. It will project a touch or proximity field through any dielectric like glass, plastic, stone, ceramic, and even most kinds of wood. It can also turn small metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch. This capability, coupled with its ability to self-calibrate, can lead to entirely new product concepts. It is designed specifically for human interfaces, like control panels, appliances, toys, lighting controls, or anywhere a mechanical switch or button may be found. OUT 1 VSS 2 SNSK 3 6 SYNC/MODE 5 VDD 4 SNS AT A GLANCE Number of keys Technology Key outline sizes Electrode design Layers required Electrode materials Electrode Substrates Panel materials Panel thickness Key sensitivity Interface Moisture tolerance Power Package Signal processing Applications Patents: One Patented spread-spectrum charge-transfer direct mode 6mm x 6mm or larger panel thickness dependent widely different sizes and shapes possible Solid or ring electrode shapes One Etched copper, silver, carbon, Indium Tin Oxide ITO , Orgacon† ink PCB, FPCB, plastic films, glass Plastic, glass, composites, painted surfaces low particle density metallic paints possible Up to 50mm glass, 20mm plastic electrode size dependent Settable via capacitor Digital output, active high Good 2V ~ 5V 6-pin SOT23-6 RoHS compliant Self-calibration, auto drift compensation, noise filtering Control panels, consumer appliances, toys, lighting controls, mechanical switch or button QTouch patented Charge-transfer method HeartBeat monitors health of device † Orgacon is a registered trademark of Agfa-Gevaert N.V AVAILABLE OPTIONS SOT23-6 -40ºC to +85ºC QT100-ISG CCopyright 2006-2007 QRG Ltd QT100_3R0.09_0707 Contents 1 Overview 3 Introduction 3 Basic Operation 3 Electrode Drive 3 Sensitivity 3 Introduction 3 Increasing Sensitivity 3 Decreasing Sensitivity 3 2 Operation Specifics 3 Run Modes 3 Introduction 3 Fast Mode 3 Low Power Mode 3 SYNC Mode 4 Threshold 4 Max On-duration 4 Detect Integrator 4 Forced Sensor Recalibration 5 Drift Compensation 5 Response Time 5 Spread Spectrum 5 Output Features 5 Output 5 HeartBeat Output 5 Output Drive 6 3 Circuit Guidelines 6 Application Note 6 Sample Capacitor 6 Power Supply, PCB Layout 6 4 Specifications 7 Absolute Maximum Specifications 7 Recommended Operating Conditions 7 AC Specifications 7 Signal Processing 7 DC Specifications 8 Mechanical Dimensions 8 Marking 9 Moisture Sensitivity Level MSL 9 5 Datasheet Control 10 Changes 10 Numbering Convention 10 QT100_3R0.09_0707 Introduction The QT100 is a digital burst mode charge-transfer QT sensor designed specifically for touch controls it includes all hardware and signal processing functions necessary to provide stable sensing under a wide variety of changing conditions. Only a single low cost, noncritical capacitor is required for operation. Figure shows a basic circuit using the device. Basic Operation The QT100 employs bursts of charge-transfer cycles to acquire its signal. Burst mode permits power consumption in the microamp range, dramatically reduces RF emissions, lowers susceptibility to EMI, and yet permits excellent response time. Internally the signals are digitally processed to reject impulse noise, using a 'consensus' filter which requires four consecutive confirmations of a detection before the output is activated. The QT switches and charge measurement hardware functions are all internal to the QT100. Electrode Drive For optimum noise immunity, the electrode should only be connected to SNSK. In all cases the rule Cs >> Cx must be observed for proper operation a typical load capacitance Cx ranges from 5-20pF while Cs is usually about 2-50nF. Increasing amounts of Cx destroy gain, therefore it is important to limit the amount of stray capacitance on both SNS terminals. This can be done, for example, by minimizing trace lengths and widths and keeping these traces away from power or ground traces or copper pours. The traces and any components associated with SNS and SNSK will become touch sensitive and should be treated with caution to limit the touch area to the desired location. A series resistor, Rs, should be placed in line with SNSK to the electrode to suppress ESD and EMC effects. Sensitivity Introduction The sensitivity on the QT100 is a function of things like the value of Cs, electrode size and capacitance, electrode shape and orientation, the composition and aspect of the object to be sensed, the thickness and composition of any overlaying panel material, and the degree of ground coupling of both sensor and object. Increasing Sensitivity In some cases it may be desirable to increase sensitivity for example, when using the sensor with very thick panels having a low dielectric constant. Sensitivity can often be increased by using a larger electrode or reducing panel thickness. Increasing electrode size can have diminishing returns, as high values of Cx will reduce sensor gain. Figure Basic Circuit Configuration

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QT100 CHARGE-TRANSFER QTOUCH IC

The QT100 charge-transfer ‘QT’ touch sensor is a self-contained digital IC capable of detecting near-proximity or touch. It will project a touch or proximity field through any dielectric like glass, plastic, stone, ceramic, and even most kinds of wood. It can also turn small metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch. This capability, coupled with its ability to self-calibrate, can lead to entirely new product concepts.

It is designed specifically for human interfaces, like control panels, appliances, toys, lighting controls, or anywhere a mechanical switch or button may be found.

OUT 1 VSS 2 SNSK 3
6 SYNC/MODE 5 VDD 4 SNS

AT A GLANCE

Number of keys Technology Key outline sizes Electrode design Layers required Electrode materials Electrode Substrates Panel materials Panel thickness Key sensitivity Interface Moisture tolerance Power Package Signal processing Applications Patents:

One Patented spread-spectrum charge-transfer direct mode 6mm x 6mm or larger panel thickness dependent widely different sizes and shapes possible Solid or ring electrode shapes One Etched copper, silver, carbon, Indium Tin Oxide ITO , Orgacon† ink PCB, FPCB, plastic films, glass Plastic, glass, composites, painted surfaces low particle density metallic paints possible Up to 50mm glass, 20mm plastic electrode size dependent Settable via capacitor Digital output, active high Good 2V ~ 5V 6-pin SOT23-6 RoHS compliant Self-calibration, auto drift compensation, noise filtering Control panels, consumer appliances, toys, lighting controls, mechanical switch or button QTouch patented Charge-transfer method HeartBeat monitors health of device
† Orgacon is a registered trademark of Agfa-Gevaert N.V

AVAILABLE OPTIONS

SOT23-6
-40ºC to +85ºC

QT100-ISG

CCopyright 2006-2007 QRG Ltd

QT100_3R0.09_0707

Contents
1 Overview 3 Introduction 3 Basic Operation 3 Electrode Drive 3 Sensitivity 3 Introduction 3 Increasing Sensitivity 3 Decreasing Sensitivity 3
2 Operation Specifics 3 Run Modes 3 Introduction 3 Fast Mode 3 Low Power Mode 3 SYNC Mode 4 Threshold 4 Max On-duration 4 Detect Integrator 4 Forced Sensor Recalibration 5 Drift Compensation 5 Response Time 5 Spread Spectrum 5

Output Features 5 Output 5 HeartBeat Output 5 Output Drive 6
3 Circuit Guidelines 6 Application Note 6 Sample Capacitor 6 Power Supply, PCB Layout 6
4 Specifications 7 Absolute Maximum Specifications 7 Recommended Operating Conditions 7 AC Specifications 7 Signal Processing 7 DC Specifications 8 Mechanical Dimensions 8 Marking 9 Moisture Sensitivity Level MSL 9
5 Datasheet Control 10 Changes 10 Numbering Convention 10

QT100_3R0.09_0707

Introduction

The QT100 is a digital burst mode charge-transfer QT sensor designed specifically for touch controls it includes all hardware and signal processing functions necessary to provide stable sensing under a wide variety of changing conditions. Only a single low cost, noncritical capacitor is required for operation.

Figure shows a basic circuit using the device.

Basic Operation

The QT100 employs bursts of charge-transfer cycles to acquire its signal. Burst mode permits power consumption in the microamp range, dramatically reduces RF emissions, lowers susceptibility to EMI, and yet permits excellent response time. Internally the signals are digitally processed to reject impulse noise, using a 'consensus' filter which requires four consecutive confirmations of a detection before the output is activated.

The QT switches and charge measurement hardware functions are all internal to the QT100.

Electrode Drive

For optimum noise immunity, the electrode should only be connected to SNSK.

In all cases the rule Cs >> Cx must be observed for proper operation a typical load capacitance Cx ranges from 5-20pF while Cs is usually about 2-50nF.

Increasing amounts of Cx destroy gain, therefore it is important to limit the amount of stray capacitance on both SNS terminals. This can be done, for example, by minimizing trace lengths and widths and keeping these traces away from power or ground traces or copper pours.

The traces and any components associated with SNS and SNSK will become touch sensitive and should be treated with caution to limit the touch area to the desired location.

A series resistor, Rs, should be placed in line with SNSK to the electrode to suppress ESD and EMC effects.

Sensitivity

Introduction

The sensitivity on the QT100 is a function of things like the value of Cs, electrode size and capacitance, electrode shape and orientation, the composition and aspect of the object to be sensed, the thickness and composition of any overlaying panel material, and the degree of ground coupling of both sensor and object.

Increasing Sensitivity

In some cases it may be desirable to increase sensitivity for example, when using the sensor with very thick panels having a low dielectric constant. Sensitivity can often be increased by using a larger electrode or reducing panel thickness. Increasing electrode size can have diminishing returns, as high values of Cx will reduce sensor gain.

Figure Basic Circuit Configuration

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Datasheet ID: QT100-ISG 519355