Four-way independent touch switch circuit

Published:2011/5/13 3:54:00 Author:Nicole | Keyword: touch switch | From:SeekIC

The touch switch of this circuit, if the finger touches the finger touch key metal plate, the output terminal will repeatedly change with L to H or H to L . CS terminal is chip selection control, KS is switch selection sign output, DIS1~DIS4 are the output prohibition terminal of each switch. When DIS= L , the corresponding output is forced to be L . In order to prevent the input jitter influence, it contains inside Schmidt trigger; the output level adopts transistor emitter to output. IN is input terminal; the external 100kΩ resistance is limit current protection; R1, C1 is used to prevent the induction AC interference.



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