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WM8311 Datasheet(PDF) 134 Page - Wolfson Microelectronics plc |
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WM8311 Datasheet(HTML) 134 Page - Wolfson Microelectronics plc |
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134 / 302 page  WM8311 Pre-Production w PP, May 2012, Rev 3.1 134 Figure 28 X-axis Measurement on 4-wire Touch Panel Y-axis measurement is performed by applying a potential difference between the Top and Bottom sides of the touch panel. When contact is made between the two sheets, the voltage present on the Left or Right connections is a measure of the Y-axis position of the contact. The configuration is illustrated in Figure 29. Figure 29 Y-axis Measurement on 4-wire Touch Panel ‘Pen Down’ detection uses a zero-power comparator with an internal, programmable pull-up resistor. When the touch panel is not being touched, no current flows between the touch panel sheets, and the comparator output is low. When the touch panel is touched, current flows through the panel and through the pull-up resistor, and the comparator output goes high. The sensitivity of the circuit can be adjusted using different values of pull-up resistor; a large pull-up resistance leads to the most sensitive response. The configuration is illustrated in Figure 30. Figure 30 Pen-Down Detection on 4-wire Touch Panel |
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