qt118h Quantum Research Group, qt118h Datasheet
qt118h
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qt118h Summary of contents
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... Light switches Industrial panels The QT118H charge-transfer (“QT’”) touch sensor is a self-contained digital IC capable of detecting near-proximity or touch. It will project a sense field through almost any dielectric, like glass, plastic, stone, ceramic, and wood. It can also turn small metal-bearing objects into intrinsic sensors, making them respond to proximity or touch. This capability coupled with an ability to self calibrate continuously can lead to entirely new product concepts ...
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... too small, it can simply be piezo ‘topped up’ with a ceramic capacitor in parallel. The QT118H drives a ~4kHz signal across SNS1 and SNS2 to make the piezo (if installed) sound a short tone for 75ms immediately after detection, to act as an audible confirmation. 3.5 - 5.5V ...
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... AC ground return. 1.3.5 S 1.3.5.1 Gain Pin The QT118H can be set for one of 3 gain levels using option pin 5 (Table 1-1). This sensitivity change is made by altering the internal numerical threshold level required for a detection. Note that sensitivity is also a function of other things: like the ...
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... The rate of adjustment must be performed slowly, otherwise Tie Pin 5 to: legitimate detections could be ignored. The QT118H drift Leave open compensates using a slew-rate limited change to the reference level; the threshold and hysteresis values are Pin 6 slaved to this reference ...
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... As the basic burst spacing is 95ms, if this spacing was maintained through 4 consecutive bursts the sensor would be very slow to respond. In the QT118H, after an initial detection is sensed, the remaining three bursts are spaced only about 2ms apart, so that the slowest reaction time possible is the fastest possible ...
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... Note that the piezo drive does not operate in Pulse mode. 2.2.6 O The QT118H’s output is active high and it can source or sink 1mA of non-inductive current. Care should be taken when the IC and the load are both powered from the same supply, and the supply is minimally regulated ...
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... MOV's on the electrode trace are not advised; these devices have extremely large amounts of nonlinear parasitic capacitance which will swamp the capacitance of the electrode and cause false detections and other forms of instability. Diodes also act as RF detectors and will cause serious RF immunity problems. 7 QT118H R1.08 / 0405 ...
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... Make sure the regulator’s transient load stability provides for stable voltage just before each burst commences. For further tips on construction, PCB design, and EMC issues browse the application notes and faq at www.qprox.com 8 QT118H R1.08 / 0405 ...
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... O C, unless otherwise noted. Min Typ Max 6, 12 750 +125 Notes ms µ 5.0V Vdd ms @ 3.3V Vdd ms Depends on Cs kHz ms ms µs kHz Units Notes counts samples ms/level 4 ms/level 4 secs 3, 4 QT118H R1.08 / 0405 O C ...
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... Required for proper startup V OPT1, OPT2 V OPT1, OPT2 V OUT, 4mA sink V OUT, 1mA source ±1 µA OPT1, OPT2 14 bits 28 fF Note 2 Figure 4-2 - Typical Threshold Sensitivity vs. Cx, Medium Gain, Selected Values of Cs; Vdd = 3.0 10.00 1.00 0.10 0. Load 4.5 5 QT118H R1.08 / 0405 10nF 20nF 50nF 100nF 200nF 500nF 40 ...
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... Inches Min Max 0.189 0.196 0.229 0.244 0.15 0.157 0.054 0.068 0.004 0.01 0.050 0.05 0.014 0.019 0.02 0.04 0.007 0.01 0.229 0.03 0º 8º MARKING QT118H-G QT1 + QT118H-IG QT118H R1.08 / 0405 Notes Typical BSC Typical BSC Notes BSC ...
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... SOIC MARKING DIAGRAMS VERSION ‘A’ VERSION ‘B’ Pin 1 Dimple lq ©QT1 T F Lot Code 0214HB6.G 'G' ending indicates Pb-free QPROX C package Pin 1 Dimple QT118H-IG Lot Code 0214HB6C ©QPROX 12 Lot code (last letter varies) 'G' ending indicates Pb-free package QT118H R1.08 / 0405 ...
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... NOTES lq 13 QT118H R1.08 / 0405 ...
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Tel: +44 (0)23 8056 5600 Fax: +44 (0)23 80565600 This device covered under one or more of the following United States and international patents: 5,730,165, 6,288,707, 6,377,009, 6,452,514, 6,457,355, 6,466,036, 6,535,200. Numerous further patents are pending which may apply ...