Low-voltage joystick port interface
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United States of America Patent
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-
Oct 2, 2001
Grant Date -
N/A
app pub date -
Jul 10, 1998
filing date -
Jul 10, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The joystick port interface includes an integrated circuit receiving an analog joystick position measurement signal and outputting a digital pulse signal to a processor which signifies a joystick coordinate value. The integrated circuit includes a pulse generator and a bidirectional buffer circuit. The bidirectional buffer circuit receives the analog joystick position measurement signal and selectively discharges an RC network capacitor which provides this analog measurement. This implementation provides a joystick port which uses low-voltage CMOS VLSI structures which can interface a conventional high-voltage joystick with the processor.
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