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MK712SLFTR Datasheet(PDF) 8 Page - Integrated Device Technology |
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MK712SLFTR Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 21 page MK712 TOUCH SCREEN CONTROLLER TOUCH SCREEN CONTROL IDT™ TOUCH SCREEN CONTROLLER 8 MK712 REV N 051310 Recommended Method for Reading Points If the user is pressing lightly on the touch screen, it is likely that the screen contact will be intermittent. The screen will bounce, causing false points. This effect can be reduced by insuring that the screen is touched both before and after a conversion. By doing this, the first and last point in a series of points are discarded. The following algorithm checks that a point has valid touches both before and after a conversion, and it distinguishes between change-in-touch interrupts and conversion complete interrupts. Register 6 bits 0, 1, and 2 must all be true (logical 1) in order to use this method. Warning–When Using a Switching Regulator Power Supply When using the MK712 in a system where the power is supplied by a switching regulator, do not perform screen conversions when the regulator is operating in the power saving mode. Some switching regulators feature a low power mode (for example, Linear Technology’s “Burst Mode”) where the output is turned on and off in order to save power. The extra power supply noise generated when using this mode causes spurious data points to be returned from the MK712, so it should be disabled when the MK712 is doing screen conversions. |
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