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Optimizing performance versus power consumption in capacitive touch sensing designs

Capacitive sensing has replaced mechanical buttons in a wide range of consumer appliances. This has been possible largely because capacitive sensors are durable, more reliable, and provide better aesthetics that support multiple functionalities at literally the tip of a finger. The quality of a capacitive sensing implementation, however, depends upon its response time and power consumption. Highly responsive systems give a real-time feel while reducing power consumption improves operating life in the case of battery-based devices. In this article, we discuss some standard capacitive sensing elements and applications with a focus on balancing power consumption and response time for embedded engineers developing capacitive sensing interfaces.

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578.61 KB
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26/08/2011