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MK712S Datasheet(PDF) 8 Page - Integrated Circuit Systems

Part # MK712S
Description  Touch Screen Controller
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Manufacturer  ICST [Integrated Circuit Systems]
Direct Link  http://www.icst.com
Logo ICST - Integrated Circuit Systems

MK712S Datasheet(HTML) 8 Page - Integrated Circuit Systems

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MK712
Touch Screen Controller
MDS 712 I
8
Revision 100899
Printed 11/16/00
Integrated Circuit Systems, Inc.•525 Race St.•San Jose•CA•95126•(408)295-9800tel•www.icst.com
I C R O
C LOC K
Read Register 0 D7D5, store as D7D5(n)
Wait for Interrupt
Is D7D5(n-1) = 11b
and D7D5(n) =11b?
No
Yes
Write point n-1 to display
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.
Are this point and the previous point valid?
(11b = binary 11)
Write previous point.
Start
Interrupt
Increment
n
Read X and Y, store as point n
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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