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WM8311 Datasheet(PDF) 136 Page - Wolfson Microelectronics plc |
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WM8311 Datasheet(HTML) 136 Page - Wolfson Microelectronics plc |
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136 / 302 page  WM8311 Pre-Production w PP, May 2012, Rev 3.1 136 Figure 33 Y-axis Measurement on 5-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 34. Figure 34 Pen-Down Detection on 5-wire Touch Panel Note that Z-axis (pressure) measurement is not supported on the 5-wire Touch Panel. |
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