Overview
Introduction
The QT102 is a single key device featuring a touch on / touch off (toggle) output with a programmable auto switch-off capability. The QT102 is a digital burst mode charge-transfer (QT) sensor designed specifically for touch controls; it includes all hardware and signal processing functions necessary to provide stable sensing under a wide variety of changing conditions. Only low cost, noncritical components are required for operation.
The sensitivity of the QT102 is a function of such things as:
• the value of Cs
• electrode size and capacitance
• electrode shape and orientation
• the composition and aspect of the object to be sensed
• the thickness and composition of any overlaying panel material
• the degree of ground coupling of both sensor and object
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