Keyboard encoding system with electronic hysteresis

Details Keyboard encoding system with electronic hysteresis Keyboard encoding system with electronic hysteresis

H - Electricity

01

H

340/178

H01H 13/70 (2006.01) H03K 17/98 (2006.01) H03M 11/02 (2006.01)

Patent

CA 1091783

KEYBOARD ENCODING SYSTEM WITH ELECTRONIC HYSTERESIS ABSTRACT OF THE INVENTION A keyboard encoding system which utilizes electronic hysteresis to prevent undesired key stroke encoding. The out- put of a capacitive switch matrix is supplied to a sense amplifier which has its sensitivity increased if a particular switch of the switch matrix was closed the last scan cycle. The status of the switches of the switch matrix during the last scan cycle is provided by a shift register having a number of stages equal to the number of switches of the matrix. The sense amplifier includes a comparator which receives an input indicative of the state of a particular matrix switch during the present scan cycle and an input from the shift register indicative of the status of the particular matrix switch the previous scan cycle. If the input from the shift register is high, the sensitivity of the sense amplifier is increased.

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