PDF QT140 Data sheet ( Hoja de datos )

Número de pieza	QT140
Descripción	(QT140 / QT150) 4 AND 5 KEY QTOUCH SENSOR ICs
Fabricantes	QUANTUM
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No Preview Available ! www.DataSheet4U.com lQ QProx™ QT140 / QT150 4 AND 5 KEY QTOUCH™ SENSOR ICs Completely independent QT touch circuits Individual logic outputs per channel (open drain) Projects prox fields through any dielectric Only one external capacitor required per channel Sensitivity easily adjusted on a per-channel basis 100% autocal for life - no adjustments required 3~5.5V, 5mA single supply operation Toggle mode for on/off control (strap option) 10s, 60s, infinite auto-recal timeout (strap options) AKS™ Adjacent Key Suppression (pin option) Sync pin for multi-chip sync or line sync Less expensive per key than many mechanical switches Eval board with backlighting - p/n E160 SSOP DIP Vss Vss Vdd Vdd SNS1A SNS1B SNS2A SNS2B SNS3A SNS3B SNS4A SNS4B SNS5A Vss /RST OSC_I OSC_O OPT2 OPT1 SYNC OUT5 OUT4 OUT3 OUT2 OUT1 AKS OC SNS5B Vdd Vdd Vss Vss Vss SNS1A SNS1B SNS2A SNS2B SNS3A SNS3B SNS4A SNS4B SNS5A /RST OSC_I OSC_O OPT2 OPT1 SYNC OUT5 OUT4 OUT3 OUT2 OUT1 AKS OC SNS5B QT150 shown - NOTE: Pinouts are not the same! APPLICATIONS PC Peripherals Backlighted buttons Appliance controls Security systems Access systems Pointing devices Instrument panels Gaming machines QT140 / QT150 charge-transfer (“QT’”) QTouch ICs are self-contained digital controllers capable of detecting near-proximity or touch on 4 or 5 electrodes. They allow electrodes to project independent sense fields through any dielectric like glass, plastic, stone, ceramic, and wood. They can also turn metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch. This capability coupled with their continuous self-calibration feature can lead to entirely new product concepts, adding high value to product designs. Each of the channels operates independently of the others, and each can be tuned for a unique sensitivity level by simply changing its sample capacitor value. 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 require only a common inexpensive capacitor per sensing channel in order to function. They also offer patent pending AKS™ Adjacent Key Suppression which 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. These devices also have a SYNC I/O pin which allows for synchronization with additional similar parts and/or to an external to suppress interference. 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 ageing, 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. TA 00C to +700C -400C to +1050C 00C to +700C -400C to +1050C LQ AVAILABLE OPTIONS SSOP-28 - QT140-AS - QT150-AS DIP-28 QT140-D - QT150-D - Copyright © 2002 QRG Ltd QT140/150 1.01/1102 1 page Figure 1-6 Basic Circuit (QT140, SSOP Package) Figure 1-7 Basic Circuit (QT150, SSOP Package) Figure 1-8 Synchronized QT140, QT150 Circuits 5 Page 4.5 SIGNAL PROCESSING Description Threshold differential Hysteresis Consensus filter length (Detection integrator) Positive drift compensation rate Negative drift compensation rate Post-detection recalibration timer duration Value 6 2 3 990 231 10, 60, infinite Units counts counts samples ms/level ms/level secs Notes From signal reference From threshold Option pin selected All curves at Vdd = 5.0V 18000 16000 14000 12000 10000 8000 6000 4000 2000 0 0 Burst Duration v s. Cs, Cx Cs = 220nF Cs = 100nF Cs = 47nF Cs = 39nF Cs = 22nF Cs = 10nF 10 20 30 40 50 Cx 4000 3500 3000 2500 2000 1500 1000 500 0 0 Burst Duration v s. Cs, Cx Cs = 47nF Cs = 39nF Cs = 22nF Cs = 10nF 10 20 30 40 50 Cx Figure 4-1 Figure 4-2 18000 16000 14000 12000 10000 8000 6000 4000 2000 0 0 Burst Duration cs. Cs, Cx Cx = 5pF Cx = 10pF Cx = 15pF Cx = 22pF Cx = 33pF Cx = 47pF 50 100 150 200 250 Cs, nF Figure 4-3 lQ 11 QT140/150 1.01/1102 11 Page

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