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QT118H-D

ETC
Part Number QT118H-D
Manufacturer ETC
Description CHARGE-TRANSFER TOUCH SENSOR
Published Apr 16, 2005
Detailed Description lQ CHARGE-TRANSFER TOUCH SENSOR QProx™ QT118H Less expensive than many mechanical switches Projects a ‘touch button’ ...
Datasheet PDF File QT118H-D PDF File

QT118H-D
QT118H-D


Overview
lQ CHARGE-TRANSFER TOUCH SENSOR QProx™ QT118H Less expensive than many mechanical switches Projects a ‘touch button’ through any dielectric Turns small objects into intrinsic touch sensors 100% autocal for life - no adjustments required Only one external part required - a 1¢ capacitor Piezo sounder direct drive for ‘tactile’ click feedback LED drive for visual feedback 3V 20µA single supply operation Toggle mode for on/off control (strap option) 10s or 60s auto-recalibration timeout (strap option) Pulse output mode (strap option) Gain settings in 3 discrete levels Simple 2-wire operation possible HeartBeat™ health indicator on output Vdd O ut O pt1 O pt2 1 8 Vss Sn s2 Sn s1 G ain Q T1 18 H 2 3 4 7 6 5 APPLICATIONS Light switches Industrial panels Appliance control Security systems Access systems Pointing devices Elevator buttons Toys & games 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 most kinds of wood.
It can also turn small metal-bearing objects into intrinsic sensors, making them respond to proximity or touch.
This capability coupled with its ability to self calibrate continuously 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; it may also be used for some material sensing and control applications provided that the presence duration of objects does not exceed the recalibration timeout interval.
The IC requires only a common inexpensive capacitor in order to function.
A bare piezo beeper can be connected to create a ‘tactile’ feedback clicking sound; the beeper itself then doubles as the required external capacitor, and it can also become the sensing electrode.
An LED can also be added to provide visual sensing indi...


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