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Capacitive sensing techniques and considerations – The basics

Posted: 03 Dec 2007     Print Version  Bookmark and Share

Keywords:capacitive sensing  ESD  input medium 

Capacitive sensing as a user input medium is no longer a fringe technology relegated to select products. It is now a mature technology employed in thousands of products and millions of units. Significant development has taken place as design houses, module manufactures and semiconductor companies vie for a larger share of the rapidly expanding market. At the heart of this development are the sensing methods themselves, the process by which capacitance is measured and converted into digital values that can be processed, manipulated and interpreted. Charge Transfer, Successive Approximation, Sigma-Delta, and Mutual Capacitance Measurement are the most commonly used sensing methods. Each is described here.

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