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AR1011 Datasheet(PDF) 8 Page - Microchip Technology |
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AR1011 Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 61 page  AR1000 SERIES RESISTIVE TOUCH SCREEN CONTROLLER DS40001393C-page 8 2009-2016 Microchip Technology Inc. 2.5 5-Wire Sensor A 5-wire resistive touch sensor consists of a flex and stable layer, electrically separated by spacer dots. The touch position is determined by first applying a voltage gradient across the stable layer in the X-axis direction and using the flex layer to measure the axis touch posi- tion voltage. The second step is applying a voltage gra- dient across the stable layer in the Y-axis direction and using the flex layer to measure the axis touch position voltage. The voltage is not directly applied to the edges of the active layer, as it is for 4-wire and 8-wire sensors. The voltage is applied to the corners of a 5-wire sensor. To measure the X-axis, the left edge of the layer is driven with 0V (ground), using connections to the upper left and lower left sensor corners. The right edge is driven with +5 VDC, using connections to the upper right and lower right sensor corners. To measure the Y-axis, the top edge of the layer is driven with 0V (ground), using connections to the upper left and upper right sensor corners. The bottom edge is driven with +5 VDC, using connections to the lower left and lower right sensor corners. The measured voltage at any position across a driven axis is predictable. A touch moving in the direction of the driven axis will yield a linearly changing voltage. A touch moving perpendicular to the driven axis will yield a relatively unchanging voltage (See Figure 2-3). FIGURE 2-3: 5-Wire Decoding |
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