Product category:
Touchscreens and Touch Sensors
News Release from: Quantum Research Group | Subject: QT1101-QTouch
Edited by the Electronicstalk Editorial
Team on 19 August 2005
Key touch sensor covers a perfect ten
The QT1101-QTouch charge-transfer integrated circuit is a self-contained digital controller capable of detecting near-proximity or touch on up to 10 individual keys.
Designed for consumer applications such as electrical and electronic appliances, gaming and mobile devices, the QT1101-QTouch charge-transfer (QT) integrated circuit is a self-contained digital controller capable of detecting near-proximity or touch on up to 10 individual keys It allows electrodes to project independent sense fields through any dielectric such as glass or plastic and features a continuous self-calibration feature to eliminate the need for adjustment
This article was originally published on Electronicstalk on 13 Jun 2001 at 8.00am (UK)
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Each channel operates independently of the others and each can be tuned for a unique sensitivity level by changing a corresponding external capacitor providing for highly flexible implementation.
A patented technique known as adjacent key suppression (AKS) suppresses touch from keys producing weaker signals and allows only the dominant key to activate.
This solves the problem of finger overlap on tightly spaced keys.
Spread spectrum burst technology provides a high degree of noise immunity.
The device can also be synchronised with other QT chips, or with an external source to suppress low frequency interference.
In its low power mode the chip consumes 60uA at 3V.
Few external components are required for a typical design and by using the QT sensing principle, the QT1101 delivers cost-effective, reliable and robust sensing that obsoletes traditional capacitive touch sensors and provides an attractive, easy to implement alternative to mechanical switches.
The sensor chip comes in a QFN-32 or 48SSOP, lead-free package and operates from a single supply of between 2.8 and 5.5V DC.
It is available now priced at US $1 each in high volumes.
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