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AN2869 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN2869 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 43 page  May 2012 Doc ID 15298 Rev 6 1/43 AN2869 Application note Guidelines for designing touch sensing applications Introduction This application note describes the layout and mechanical design guidelines used for touch sensing applications. Capacitive sensing interfaces provide many advantages compared to mechanical user interfaces. They: ● offer a modern look and feel ● are easy to clean ● are waterproof ● are robust Capacitive sensing interfaces are more and more used in a wide range of applications. The main difficulty designing such interfaces is to ensure that none of the items interfere with each other. This document provides simple guidelines covering three main aspects: 1. Printed circuit board (PCB) 2. Overlay and panel materials 3. All other items in the capacitive sensor environment Depending on which application you are designing, you may not need to refer to all of the contents of this document. You can go to the appropriate section after reading the common part which contains the main capacitive sensing guidelines. For example, if you are developing an application with only projected electrode, you should first read the main capacitive sensing guidelines and then go through the sections giving specific recommendations for projected electrode designs. Table 1 lists the microcontrollers concerned by this application note. Table 1. Applicable products Type Applicable products Product family Proximity and touchkey microcontrollers STM8A automotive microcontrollers STM8L ultra-low-power microcontrollers STM8S mainstream microcontrollers STM8T touch-sensing microcontrollers STM32 F0 entry-level Cortex™-M0 microcontrollers STM32 L1 ultra-low-power ARM Cortex™-M3 based microcontrollers www.st.com |
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