QT1080-ISG

QT1080-ISG Datasheet

QT1080

Part	Datasheet
QT1080-ISG	QT1080-ISG (pdf)

Related Parts	Information
QT1080-IS48G	QT1080-IS48G

PDF Datasheet Preview
QT1080 8 KEY QTOUCH SENSOR IC " Eight completely independent QT touch sensing fields " Designed for low-power portable applications " 100% autocal for life - no adjustments required " Direct outputs - either encoded or ‘per key’ " Fully debounced results " 2.8V to 5.0V single supply operation " 45µA current typ 3V in 360ms LP mode " AKS Adjacent Key Suppression " Spread spectrum bursts for superior noise rejection " Sync pin for excellent LF noise rejection " 10ms ‘Fast mode’ for use in slider applications " RoHS compliant packages 32-QFN and 48-SSOP SS /RST VDD OSC N.C. SNS0 SNS0K SNS1 DETECT SYNC/LP VSS SNS7K SNS7 SNS6K SNS6 SNS5K 24 23 22 21 20 19 18 17 OUT_0 25 OUT_1 26 OUT_2 27 OUT_3 28 OUT_4 29 OUT_5 30 OUT_6 31 OUT_7 32 QT1080 32-QFN 16 SNS5 15 SNS4K 14 SNS4 13 SNS3K 12 SNS3 11 SNS2K 10 SNS2 9 SN1K 1 234 56 78 ! MP3 players ! Mobile phones ! PC peripherals ! Television controls ! Pointing devices ! Remote controls QT1080 charge-transfer ’QT’ QTouch IC is a self-contained digital controller capable of detecting near-proximity or touch on up to eight electrodes. It allows electrodes to project independent sense fields through any dielectric such as glass or plastic. This capability coupled with its continuous self-calibration feature can lead to entirely new product concepts, adding high value to product designs. 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. Each of the channels operates independently of the others, and each can be tuned for a unique sensitivity level by simply changing a corresponding external Cs capacitor. AKS Adjacent Key Suppression patent pending suppresses touch from weaker responding keys and only allows a dominant key to detect for example to solve the problem of large fingers on tightly spaced keys. Spread-spectrum burst technology provides superior noise rejection. These devices also have a SYNC/LP pin which allows for synchronization with additional similar parts and/or to an external source to suppress interference, or, a Low Power LP mode which conserves power. By using the charge-transfer principle, this device delivers a level of performance clearly superior to older technologies yet is highly cost-effective. This part is available in both 32-QFN and 48-SSOP RoHS compliant packages. TA -40ºC to +85ºC AVAILABLE OPTIONS 32-QFN QT1080-ISG 48-SSOP QT1080-IS48G Copyright 2004-2006 QRG Ltd QT1080 R11.06/0806 Contents 1 Overview 3 Parameters 3 Wiring 4 2 Device Operation 7 Start-up Time 7 Option Resistors 7 OUT Pins - Direct Mode 7 OUT Pins - Binary Coded Mode 7 DETECT Pin 7 SYNC/LP Pin 7 AKS Function Pins 8 MOD_0, MOD_1 Inputs 8 Fast Detect Mode 8 Simplified Mode 8 Unused Keys 8 3 Design Notes 8 Oscillator Frequency 8 Spread-spectrum Circuit 8 Cs Sample Capacitors - Sensitivity 9 Power Supply 9 PCB Layout and Construction 9 4 Specifications 10 Absolute Maximum Specifications 10 Recommended Operating Conditions 10 AC Specifications 10 DC Specifications 10 Signal Processing 10 Idd Curves Average 11 LP Mode Typical Response Times 12 Mechanical - 32-QFN Package 13 Mechanical - 48-SSOP Package 13 Part Marking 14 QT1080 R11.06/0806 Parameters The QT1080 is an easy to use, eight-touch-key sensor IC based on Quantum’s patented charge-transfer principles for robust operation and ease of design. This device has many advanced features which provide for reliable, trouble-free operation over the life of the product. Burst operation The device operates in ‘burst mode’. Each key is acquired using a burst of charge-transfer sensing pulses whose count varies depending on the value of the reference capacitor Cs and the load capacitance Cx. In LP mode, the device sleeps in an ultra-low current state between bursts to conserve power. The keys’ signals are acquired using two successive bursts of pulses: Burst A Keys 0, 1, 4, 5 Burst B Keys 2, 3, 6, 7 Bursts always operate in A-B sequence. Self-calibration On power-up, all eight keys are self-calibrated within 350 milliseconds typical to provide reliable operation under almost any conditions. Autorecalibration The device can time out and recalibrate each key independently after a fixed interval of continuous touch detection, so that the keys can never become ‘stuck on’ due to foreign objects or other sudden influences. After recalibration the key will continue to function normally. The delay is selectable to be either 10s, 60s, or infinite disabled . The device also autorecalibrates a key when its signal reflects a sufficient decrease in capacit ance. In this case the device recalibrates after ~2 seconds so as to recover normal operation quickly. Drift compensation operates to correct the reference level of each key slowly but automatically over time, to suppress false detections caused by changes in temperature, humidity, dirt and other environmental effects. The drift compensation is asymmetric in the increasing capacitive load direction the device drifts more slowly than in the decreasing direction. In the increasing direction, the rate of compensation is one count of signal per 2 seconds in the opposing direction, it is one count every 500ms.

PDF Datasheet Preview

QT1080
8 KEY QTOUCH SENSOR IC
" Eight completely independent QT touch sensing fields " Designed for low-power portable applications " 100% autocal for life - no adjustments required " Direct outputs - either encoded or ‘per key’ " Fully debounced results " 2.8V to 5.0V single supply operation " 45µA current typ 3V in 360ms LP mode " AKS Adjacent Key Suppression " Spread spectrum bursts for superior noise rejection " Sync pin for excellent LF noise rejection " 10ms ‘Fast mode’ for use in slider applications " RoHS compliant packages 32-QFN and 48-SSOP

SS /RST VDD OSC N.C. SNS0 SNS0K SNS1

DETECT SYNC/LP VSS SNS7K SNS7 SNS6K SNS6 SNS5K
24 23 22 21 20 19 18 17

OUT_0 25 OUT_1 26 OUT_2 27 OUT_3 28 OUT_4 29 OUT_5 30 OUT_6 31 OUT_7 32

QT1080 32-QFN
16 SNS5 15 SNS4K 14 SNS4 13 SNS3K 12 SNS3 11 SNS2K 10 SNS2
9 SN1K
1 234 56 78
! MP3 players ! Mobile phones
! PC peripherals ! Television controls
! Pointing devices ! Remote controls

QT1080 charge-transfer ’QT’ QTouch IC is a self-contained digital controller capable of detecting near-proximity or touch on up to eight electrodes. It allows electrodes to project independent sense fields through any dielectric such as glass or plastic. This capability coupled with its continuous self-calibration feature can lead to entirely new product concepts, adding high value to product designs. 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.

Each of the channels operates independently of the others, and each can be tuned for a unique sensitivity level by simply changing a corresponding external Cs capacitor.

AKS Adjacent Key Suppression patent pending suppresses touch from weaker responding keys and only allows a dominant key to detect for example to solve the problem of large fingers on tightly spaced keys.

Spread-spectrum burst technology provides superior noise rejection. These devices also have a SYNC/LP pin which allows for synchronization with additional similar parts and/or to an external source to suppress interference, or, a Low Power LP mode which conserves power.

By using the charge-transfer principle, this device delivers a level of performance clearly superior to older technologies yet is highly cost-effective.

This part is available in both 32-QFN and 48-SSOP RoHS compliant packages.

TA -40ºC to +85ºC

AVAILABLE OPTIONS 32-QFN

QT1080-ISG
48-SSOP QT1080-IS48G

Copyright 2004-2006 QRG Ltd QT1080 R11.06/0806

Contents
1 Overview 3 Parameters 3 Wiring 4
2 Device Operation 7 Start-up Time 7 Option Resistors 7 OUT Pins - Direct Mode 7 OUT Pins - Binary Coded Mode 7 DETECT Pin 7 SYNC/LP Pin 7 AKS Function Pins 8 MOD_0, MOD_1 Inputs 8 Fast Detect Mode 8 Simplified Mode 8 Unused Keys 8
3 Design Notes 8 Oscillator Frequency 8

Spread-spectrum Circuit 8 Cs Sample Capacitors - Sensitivity 9 Power Supply 9 PCB Layout and Construction 9 4 Specifications 10 Absolute Maximum Specifications 10 Recommended Operating Conditions 10 AC Specifications 10 DC Specifications 10 Signal Processing 10 Idd Curves Average 11 LP Mode Typical Response Times 12 Mechanical - 32-QFN Package 13 Mechanical - 48-SSOP Package 13 Part Marking 14

QT1080 R11.06/0806

Parameters

The QT1080 is an easy to use, eight-touch-key sensor IC based on Quantum’s patented charge-transfer principles for robust operation and ease of design. This device has many advanced features which provide for reliable, trouble-free operation over the life of the product.

Burst operation The device operates in ‘burst mode’. Each key is acquired using a burst of charge-transfer sensing pulses whose count varies depending on the value of the reference capacitor Cs and the load capacitance Cx. In LP mode, the device sleeps in an ultra-low current state between bursts to conserve power. The keys’ signals are acquired using two successive bursts of pulses:

Burst A Keys 0, 1, 4, 5 Burst B Keys 2, 3, 6, 7

Bursts always operate in A-B sequence.

Self-calibration On power-up, all eight keys are self-calibrated within 350 milliseconds typical to provide reliable operation under almost any conditions.

Autorecalibration The device can time out and recalibrate each key independently after a fixed interval of continuous touch detection, so that the keys can never become ‘stuck on’ due to foreign objects or other sudden influences. After recalibration the key will continue to function normally. The delay is selectable to be either 10s, 60s, or infinite disabled .

The device also autorecalibrates a key when its signal reflects a sufficient decrease in capacit ance. In this case the device recalibrates after ~2 seconds so as to recover normal operation quickly.

Drift compensation operates to correct the reference level of each key slowly but automatically over time, to suppress false detections caused by changes in temperature, humidity, dirt and other environmental effects.

The drift compensation is asymmetric in the increasing capacitive load direction the device drifts more slowly than in the decreasing direction. In the increasing direction, the rate of compensation is one count of signal per 2 seconds in the opposing direction, it is one count every 500ms.

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived QT1080-ISG Datasheet file may be downloaded here without warranties.

Datasheet ID: QT1080-ISG 519357