Touch screen controller
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United States of America Patent
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May 18, 2004
Grant Date -
N/A
app pub date -
Oct 27, 2000
filing date -
Oct 29, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
An improved touch screen controller including a comparator and an analog-to-digital converter. The comparator of the touch screen controller detects a touch of the touch screen while the analog-to-digital converter is powered down. The Data Out (DOUT) line of the touch screen controller is used to signal the microprocessor that a touch has occurred. The unique structure of the improved touch screen controller and the fast switching edges of the comparator output signal provide for a faster touch screen controller that consumes little power without requiring a dedicated pin for the touch signal.
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