Detection circuit for matrix touch pad

Details Detection circuit for matrix touch pad Detection circuit for matrix touch pad

1990-10-16

1993-02-23

Yusko, Donald J.

Coded data generation or conversion

Bodily actuated code generator

Including keyboard or keypad

341 34, 364189, H03M 1120

Patent

active

051894173

ABSTRACT:
A circuit for detecting user contact of one of a plurality of touch pads includes a plurality of drive lines and a plurality of sense lines coupled with the touch pads. A sense circuit responsive to the signals on the sense lines produces a pulse having a width that is proportional to the amplitude of each of the sense signals. A control circuit measures the width of the pulses produced by the sense circuit and compares each measured pulse width to a reference pulse width to distinguish between a touch and no-touch condition for each touch pad. The sense circuit is illustrated in the form of a comparator having a threshold input that is always exceeded by the sense signal to produce the variable width pulse. Separate amplifiers may be provided for each sense line.

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