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WM8948 Datasheet(PDF) 96 Page - Wolfson Microelectronics plc |
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WM8948 Datasheet(HTML) 96 Page - Wolfson Microelectronics plc |
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96 / 189 page  WM8948 Production Data w PD, May 2011, Rev 4.1 96 WM8948 YP XP YN XN GND LDOVDD AUX ADC X position Figure 35 X-axis Touch Panel Measurement 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 36. WM8948 YP XP YN XN GND LDOVDD AUX ADC Y position Figure 36 Y-axis Touch Panel Measurement ‘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 37. WM8948 YP XP YN XN GND LDOVDD RPU zero power comparator PEN_DOWN Figure 37 Pen-Down Touch Panel Detection |
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