QT220-ISSG

QT220-ISSG Datasheet

QT220-ISSG

Part	Datasheet
QT220-ISSG	QT220-ISSG (pdf)

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QT220-ISSG 2 KEY QTOUCH SENSOR IC " Two independent charge-transfer ‘QT’ touch keys " Individual outputs per channel - active high " Projects prox fields through any dielectric " Sensitivity easily adjusted on a per-channel basis " 100% autocal for life - no adjustments required " 3.9V ~ 5.5V single supply operation " 10s, 60s, infinite autorecal timeout strap options " Sync pin for line sync to suppress noise " Spread spectrum operation " Pin options for autorecalibration timings " Extremely low cost per key " 20-SSOP RoHS compliant package SNS1A 1 20 SNS2K/OPT1 SNS1K 2 19 SNS2A n.c. 3 18 OPT2 SPEED 4 n.c. 5 OUT1 6 QT220 16 20-SSOP n.c. n.c. OSC OUT2 7 14 VDD VSS 8 13 /RES SYNC/SS 9 12 n.c. n.c. 10 11 n.c. ! PC Peripherals ! Backlighted buttons ! Appliance controls ! Security systems ! Access systems ! Pointing devices ! Instrument panels ! Gaming machines The QT220 charge-transfer “QT’” QTouch IC is a self-contained digital sensor IC capable of detecting near-proximity or touch on two electrodes. It allows electrodes to project independent sense fields through any dielectric like glass, plastic, stone, ceramic, and wood. It can also turn metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch. This capability coupled with its continuous self-calibration feature can lead to entirely new product concepts , adding high value to product designs. Each of the channels operate s independently of the other, and each can be tuned for a unique sensitivity level by simply changing its sample capacitor value. Two speeds are supported, one of which consumes on ly 90µA of typical current at 4V. Unique among capacitance sensors, the device incorporates spread spectrum modulation for unsurpassed EMC compliance. The devices are designed specifically for human interfaces, like control panels, appliances, gaming devices, lighting controls, or anywhere a mechanical switch or button may be found they may also be used for some material sensing and control applications. These devices feature a SYNC pin which allows for synchronization with additional similar parts and/or to an external source to suppress interference. This pin doubles as a drive pin for spread-spectrum modulation. Option pins are provided which allow different timing and feature settings. The RISC core of these devices use signal processing techniques pioneered by Quantum which are designed to survive numerous real-world challenges, such as ‘stuck sensor’ conditions, component aging, moisture films, and signal drift. By using the charge transfer principle, these devices deliver a level of performance clearly superior to older technologies yet are highly cost-effective. AVAILABLE OPTIONS TA -400C to +850C SSOP-20 QT220-ISSG Copyright 2005-2006 QRG Ltd QT220R R1.03/1006 Contents 1 Overview 3 Introduction 3 Operating Modes 3 Electrode Drive Wiring 3 Sensitivity 4 Introduction 4 Alternative Ways to Increase Sensitivity 4 Decreasing Sensitivity 4 Key Balance 4 2 QT220 Specifics 4 Signal Processing 4 Introduction 4 Drift Compensation 4 Threshold Level 5 Max On-Duration 5 Detection Integrator 5 Forced Sensor Recalibration 5 Fast Positive Recalibration 5 Options 5 Synchronization 6 3 Circuit Guidelines 6 Cs Sample Capacitor 6 Power Supply, PCB Layout 7 Oscillator Spread Spectrum 7 Unused Channels 7 ESD Protection 7 Crosstalk Precautions 7 4 Specifications 9 Absolute Maximum Specifications 9 Recommended Operating Conditions 9 AC Specifications 9 DC Specifications 9 Signal Processing 10 Mechanical Dimensions 10 Marking 11 Moisture Sensitivity Level MSL 11

PDF Datasheet Preview

QT220-ISSG
2 KEY QTOUCH SENSOR IC
" Two independent charge-transfer ‘QT’ touch keys " Individual outputs per channel - active high " Projects prox fields through any dielectric " Sensitivity easily adjusted on a per-channel basis " 100% autocal for life - no adjustments required " 3.9V ~ 5.5V single supply operation " 10s, 60s, infinite autorecal timeout strap options " Sync pin for line sync to suppress noise " Spread spectrum operation " Pin options for autorecalibration timings " Extremely low cost per key " 20-SSOP RoHS compliant package

SNS1A 1
20 SNS2K/OPT1

SNS1K 2
19 SNS2A
n.c. 3
18 OPT2

SPEED 4 n.c. 5

OUT1 6

QT220 16
20-SSOP
n.c. n.c. OSC

OUT2 7
14 VDD

VSS 8
13 /RES

SYNC/SS 9
12 n.c.
n.c. 10
11 n.c.
! PC Peripherals ! Backlighted buttons
! Appliance controls ! Security systems
! Access systems ! Pointing devices
! Instrument panels ! Gaming machines

The QT220 charge-transfer “QT’” QTouch IC is a self-contained digital sensor IC capable of detecting near-proximity or touch on two electrodes. It allows electrodes to project independent sense fields through any dielectric like glass, plastic, stone, ceramic, and wood. It can also turn metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch. This capability coupled with its continuous self-calibration feature can lead to entirely new product concepts , adding high value to product designs.

Each of the channels operate s independently of the other, and each can be tuned for a unique sensitivity level by simply changing its sample capacitor value. Two speeds are supported, one of which consumes on ly 90µA of typical current at 4V.

Unique among capacitance sensors, the device incorporates spread spectrum modulation for unsurpassed EMC compliance.

The devices are designed specifically for human interfaces, like control panels, appliances, gaming devices, lighting controls, or anywhere a mechanical switch or button may be found they may also be used for some material sensing and control applications.

These devices feature a SYNC pin which allows for synchronization with additional similar parts and/or to an external source to suppress interference. This pin doubles as a drive pin for spread-spectrum modulation. Option pins are provided which allow different timing and feature settings.

The RISC core of these devices use signal processing techniques pioneered by Quantum which are designed to survive numerous real-world challenges, such as ‘stuck sensor’ conditions, component aging, moisture films, and signal drift. By using the charge transfer principle, these devices deliver a level of performance clearly superior to older technologies yet are highly cost-effective.

AVAILABLE OPTIONS

TA -400C to +850C

SSOP-20 QT220-ISSG

Copyright 2005-2006 QRG Ltd QT220R R1.03/1006

Contents
1 Overview 3 Introduction 3 Operating Modes 3 Electrode Drive Wiring 3 Sensitivity 4 Introduction 4 Alternative Ways to Increase Sensitivity 4 Decreasing Sensitivity 4 Key Balance 4
2 QT220 Specifics 4 Signal Processing 4 Introduction 4 Drift Compensation 4 Threshold Level 5 Max On-Duration 5 Detection Integrator 5 Forced Sensor Recalibration 5 Fast Positive Recalibration 5 Options 5 Synchronization 6
3 Circuit Guidelines 6 Cs Sample Capacitor 6 Power Supply, PCB Layout 7 Oscillator Spread Spectrum 7 Unused Channels 7 ESD Protection 7 Crosstalk Precautions 7
4 Specifications 9 Absolute Maximum Specifications 9 Recommended Operating Conditions 9 AC Specifications 9 DC Specifications 9 Signal Processing 10 Mechanical Dimensions 10 Marking 11 Moisture Sensitivity Level MSL 11

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Datasheet ID: QT220-ISSG 519365