Self-optimizing touch pad sensor circuit

Details Self-optimizing touch pad sensor circuit Self-optimizing touch pad sensor circuit

1977-12-23

1979-03-20

Morrison, Malcolm A.

Boots, shoes, and leggings

235 92CA, 307125, 324 60C, 3401462, 340365C, G06G 712, G06F 702

Patent

active

041457480

ABSTRACT:
A plurality of capacitive touch pad sensors are multiplexed to the input of a common charge transfer analog-to-digital converter (CTAD) under the control of a control logic circuit. The no-touch digital output of each touch pad is stored in a memory. The touch pads are then sequentially addressed and their output level is digitized in the CTAD and the digital output of each touch pad is compared to its no-touch value stored in the memory. If the digital value read is sufficiently different from the no-touch memorized value, a touch-detection signal is given. The no-touch digital reading in the memory is periodically updated, by a count of only one at most, if the updated no-touch value differs from the no-touch value in the memory.

REFERENCES:
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patent: 3696409 (1972-10-01), Braaten
patent: 3879711 (1975-04-01), Boaron
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patent: 3931610 (1976-01-01), Marin et al.
patent: 3974472 (1976-08-01), Gould, Jr.
patent: 4001536 (1977-01-01), Eberhardt, Jr.
patent: 4039940 (1977-08-01), Butler et al.
patent: 4053789 (1977-10-01), Schultz
patent: 4055735 (1977-10-01), Eachus et al.

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