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AT42QT2100 Datasheet(PDF) 10 Page - ATMEL Corporation |
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AT42QT2100 Datasheet(HTML) 10 Page - ATMEL Corporation |
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10 / 44 page  10 AT42QT2100 [DATASHEET] 9554E–AT42–01/13 Figure 3-1. Examples of Good and Bad Tracking 3.5 Slider and Wheel Construction The QT2100 can be connected to a linear slider element or a wheel (see Figure 3-2). Selection of linear slider operation or a wheel is set through an SPI command. As with touch button electrodes, sliders and wheels can be constructed as etched areas on a PCB or flex circuit, or from clear conductors such as Indium Tin Oxide (ITO) or screenprinted PEDOT to allow backlighting effects, or for use over an LCD display. Figure 3-2. All-Metal Slider and Wheel Construction (Downloadable CAD files can be found on the Atmel website) 3.6 Oscillator No external oscillator is needed. 3.7 PCB Layout and Construction Refer to Application Note QTAN0079, Buttons, Sliders and Wheels Sensor Design Guide and the Touch Sensors Design Guide (both downloadable from the Atmel website), for more information on construction and design methods. The sensing channels used for the individual keys can be implemented as per the Touch Sensors Design Guide. Example of GOOD tracking Example of BAD tracking 0 127 1 to 126 Position (at 7 bits: 0 t o 127) SNSA1 Tips of triangles should be spaced 4 mm apart. 4 mm 4 mm Position 0 Position 43 Position 85 SNSA2 SNSA3 SNSA3 SNSA1 SNSA2 SNSA3 |
Similar Part No. - AT42QT2100_14 |
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Similar Description - AT42QT2100_14 |
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