QT1101-ISG

QT1101-ISG Datasheet


QT1101

Part Datasheet
QT1101-ISG QT1101-ISG QT1101-ISG (pdf)
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QT1101-IS48G QT1101-IS48G QT1101-IS48G
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QT1101
10 KEY QTOUCH SENSOR IC
" Patented charge-transfer ‘QT’ design " Ten independent QT sensing fields keys " 2.8V ~ 5.5V single supply operation " 40µA current typ 3V in 360ms LP mode " 100% autocal for life - no adjustments required " Serial one or two wire interface with auto baud rate " Fully debounced results " Patented AKS Adjacent Key Suppression " Spread spectrum bursts for superior noise rejection " Sync pin for excellent LF noise rejection " ‘Fast mode’ for use in slider type applications " RoHS compliant 32-QFN, 48-SSOP packages

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

SNS8 25 SNS8K 26

SNS9 27 SNS9K 28

N.C. 29 /CHANGE 30
1W 31 RX 32

QT1101 32-QFN
16 SNS5 15 SNS4K 14 SNS4 13 SNS3K 12 SNS3 11 SNS2K 10 SNS2
9 SNS1K
1 234 56 78

SS /RST VDD OSC N.C. SNS0 SNS0K SNS1
! MP3 players ! Mobile phones
! PC peripherals ! Television controls
! Pointing devices ! Remote controls

QT1101 charge-transfer ‘QT’ QTouchTM IC is a self-contained, patented digital controller capable of detecting near-proximity or touch on up to ten 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.

Patented AKS Adjacent Key Suppression suppresses touch from weaker responding keys and allows only 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, an LP low power 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.

TA -400C to +850C

AVAILABLE OPTIONS 32-QFN

QT1101-ISG
48-SSOP QT1101-IS48G

CCopyright 2005-2006 QRG Ltd

QT1101 R4.06/0806

The QT1101 is an easy to use, ten touch-key sensor IC based on Quantum’s patented charge-transfer ‘QT’ 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 three successive bursts of pulses:

Burst A Keys 0, 1, 4, 5 Burst B Keys 2, 3, 6, 7 Burst C Keys 8, 9

Bursts always operate in A-B-C sequence.

Self-calibration On power-up, all ten keys are self-calibrated within 450ms typical to provide reliable operation under almost any conditions.

Auto-recalibration 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 auto-recalibrates a key when its signal reflects a sufficient decrease in capacitance. I n 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 two seconds. In the opposing direction, it is one count every 500ms.

Detection Integrator DI confirmation reduces the effects of noise on the QT1101 outputs. The DI mechanism requires consecutive detections over a number of measurement bursts for a touch to be confirmed and indicated on the outputs. In a like manner, the end of a touch loss of signal has to be confirmed over a number of measurement bursts. This process acts as a type of ‘ debounce’ against noise.

In normal operation, both the start and end of a touch must be confirmed for six measurement bursts. In a special ‘Fast Detect‘ mode available via jumper resistors Tables and confirmation of the start of a touch requires only two sequential detections, but confirmation of the end of a touch is still six bursts.

Fast detect is only available when AKS is disabled.

Spread Spectrum operation The bursts operate over a spread of frequencies, so that external fields will have minimal effect on key operation and emissions are very weak. Spread spectrum operation works with the DI mechanism to dramatically reduce the probability of false detection due to noise.
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Datasheet ID: QT1101-ISG 519360