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QT240-ISSG Dataheets PDF



Part Number QT240-ISSG
Manufacturers Quantum
Logo Quantum
Description 4 KEY QTOUCH SENSOR IC
Datasheet QT240-ISSG DatasheetQT240-ISSG Datasheet (PDF)

lQ " " " " " " " " " " " " QT240-ISSG 4 KEY QTOUCH™ SENSOR IC Four 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 auto recalibration timing.

  QT240-ISSG   QT240-ISSG



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lQ " " " " " " " " " " " " QT240-ISSG 4 KEY QTOUCH™ SENSOR IC Four 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 auto recalibration timings Extremely low cost per key 20-SSOP RoHS compliant package n.c. SNS2 SNS2K SNS1 SNS1K OUT1 OUT2 OUT3 VSS SS/SYNC 1 2 3 4 QT240 5 20-SSOP 6 7 8 9 10 15 14 13 12 11 OSC VDD /RES OUT4 n.c. 16 20 19 18 17 SNS3K SNS3 SNS4K SNS4 n.c. APPLICATIONS ! PC Peripherals ! Backlighted buttons ! Appliance controls ! Security systems ! Access systems ! Pointing devices ! Instrument panels ! Gaming machines The QT240 charge-transfer (“QT’”) QTouch IC is a self-contained digital sensor IC capable of detecting near-proximity or touch on four electrodes. It allows electrodes to project independent sense fields through any dielectric like glass, plastic, stone, www.DataSheet4U.com 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 others, 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 -40oC to +85oC SSOP-20 QT240-ISSG LQ Copyright © 2003-2006 QRG Ltd QT240R R1.11/1006 Contents 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Introduction . ..


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