Charge-Transfer QTouch™ ChipThe QT100A charge-transfer ('QT')
touch sensor is a self-contained digital IC capable of detecting near-proximity or
touch. It will project a
touch or proximity field through any dielectric like glass, plastic, stone, ceramic, and even most kinds of wood. It can also turn small metal-bearing objects into intrinsic sensors, making them responsive to proximity or
touch. This capability, coupled with its ability to self-calibrate, can lead to entirely new product concepts. It is designed specifically for human interfaces, like control panels, appliances, toys, lighting controls, or anywhere a mechanical switch or button may be found.
' L' s8 l4 c, U/ Q- X# XPower consumption is around 600µA in most applications when running in Fast response mode. This typically drops to 6-12µA at 2V Vdd in Low Power mode, depending on the burst length. In most cases the power supply need only be minimally regulated; for example, by Zener diodes or an inexpensive three-terminal regulator. The QT100A only requires a common inexpensive X7R ceramic capacitor in order to function. The QT100A is available in two tiny and cost-effective packages, 6-Pin WSON and a 10-Pin MSOP package
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0 |- Y+ _3 r: |( i* R, T; Y/ N# SThe QT100A employs signal processing techniques pioneered by Quantum; these are specifically designed to make the device survive real-world challenges, such as 'stuck sensor' conditions and signal drift.
6 N0 `1 X& R" z7 ^% Y3 d8 bThe Quantum-pioneered HeartBeat™ signal is also included, allowing a microcontroller to monitor the health of the QT100A continuously, if desired. By using the charge transfer principle, the IC delivers a level of performance clearly superior to older technologies in two highly cost-effective packages.
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6 k K# T. y3 `- y. e$ c& _7 REvaluation Board
The E100S evaluation board has been developed to show the capabilities of the QT100 and the QT100A. The board demonstrates the chip in a typical application; a simple through-panel single-switch. The E100S illustrates how a QTouch™ solution requires only a very simple circuit design and a minimum of external components. See the downloads table below for a schematic diagram of the board.
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The kit includes the board and 2 additional QT100 ICs.
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E100S Kit Price: US$11.75. Please contact us for availability information.
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Ordering Information
| Part # | QTouch™
0 B/ D5 j/ G& `: I. ~- T$ WChannels | Notes | Price Band | Pkg | Temp ! _0 @" h+ f6 F: M
(°C) | Power
4 B* Y% X- H( a; [) {, V# O" A(V) | Digi-Key | Farnell |
| QT100A-ISG | 1 | Replaces QT100- {1 c; V( ]# G2 Q$ n8 t3 a
| A | SOT23-6 | -40 to 85 | +2 to 5 | 5 S& @2 M% Q; H* [% w& I1 p
| 1 ?1 s# X; `+ [5 M( \ g
|
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Download a faxable
order form 7 B6 e! J2 o, K& P
Price
‡ Price Bands (100k drop price indications, in US$, FOB UK)
! b# h) K) I& p9 sA: under $0.50 | B: $0.50 - $0.80 | C: $0.80 - $1.50 | D: over $1.50
