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  Industry News  ‘Breakthough’ touch-sensing IC creates slider or wheel with seven additional keys for mobile products!
Industry News

‘Breakthough’ touch-sensing IC creates slider or wheel with seven additional keys for mobile products!

Saelig Company IncSaelig Company Inc—November 1, 20060
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Pittsford, NY: QT1106 is a unique touch-sensing and control IC providing the functionality of a touch slider or wheel with seven additional keys. Constructing a highly reliable wheel or slider uses QT1106 with a simple, inexpensive sensing element between three connection points. The device detects a single rapid touch anywhere along the sense elements, or tracks a finger moving along the wheel or slider surface in real-time. In both instances, absolute position is detected. QT1106 can also interface with seven additional touch keys, which can be independently tuned for sensitivity, allowing QT1106 to be the basis of a complete user interface for any application in which a mechanical wheel, slider or switch would normally be used. But QT1106’s “QT-touch” technology costs less to implement, allows greater design freedom and cannot wear-out, thus offering improved reliability. Target applications include mobile phones, remote controls, small kitchen appliances, home audio, portable media players (including MP3 players) and lighting controls.

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QT1106’s sensing technology allows electrodes to be made from any conductive material, which projects sense fields through any dielectric—most commonly plastic or glass. An approaching finger causes a change in the sense field, registering a touch event. Unlike traditional capacitive touch sensors, QT sensors feature automatic self-calibration on power-up. This eliminates long-term drift problems due to build up of contaminants on the touch surface or changing environmental conditions. A flexible low power mode enables system designers to optimize the trade-off between response time and power consumption.

QT1106 uses spread-spectrum burst technology to provide better than 20V/m noise rejection and minimize EMI. QT1106 has an SPI interface and features a sync mode to enable synchronization with other similar parts, or with an external source, to suppress interference. Patented adjacent key suppression (AKS) prevents multiple keys responding to a single touch. AKS works by comparing the relative signal strength from each key within a group and suppresses touch detections from keys showing a weaker signal change than the dominant one. Close spacing of keys can therefore be used, without introducing touch errors.

Designed in UK by European capacitive-sensing specialists Quantum Research Group, QT1106 comes in an RoHS-compliant, 32-QFN package and operates from a single 2.8-5V supply. QT1106 is available from stock from Saelig Co. (USA distributor for Quantum Research UK) at less than $1.00 (100K).

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Hi-Res Image: www.saelig.com/images/qt1106.jpg

Direct Link: www.saelig.com/pr/qt1106.htm

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