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MK712 Datasheet(PDF) 6 Page - Integrated Device Technology |
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MK712 Datasheet(HTML) 6 Page - Integrated Device Technology |
6 / 21 page MK712 TOUCH SCREEN CONTROLLER TOUCH SCREEN CONTROL IDT™ TOUCH SCREEN CONTROLLER 6 MK712 REV N 051310 Recommended Circuit Pen Bounce When the screen is untouched, the Y plate is driven high and the X plate is driven low. When the screen is touched, the X plate is pulled high, which is detected by the MK712. This initiates a conversion (as long as periodic conversions are enabled). Some de-bounce is provided by the time constant of the screen decoupling capacitors combined with the screen resistance. However, once conversions have started, pen bounce will not be detected until after both the X and Y points have been taken. If the pen is lifted during a conversion, this will also not be detected until the conversion is complete. This is typically indicated by a point with the correct Y coordinates, but minimum (for that screen) X coordinates. Screen Decoupling The component values suggested should give excellent results. However, for screens with a high resistance operating at a high conversion rate, extra interrupts may be issued. This is because the time constant of the screen decoupling capacitors and screen resistance is high, resulting in the screen appearing to be untouched and then touched between conversions. These extra interrupts can be eliminated by reducing the size of the screen decoupling capacitors on pins XH, XL, YH, and YL. This will, however, slightly reduce the noise rejection, which could decrease the accuracy of the conversion. |
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