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Switch Debounce A mechanical switch bounces or changes state between open and close when the switch is moved from one position or the other. A switch de-bounce circuit inhibits those changes from reaching the circuitry reading the switch position. The debounce circuit needs to eliminate all of the mechanical oscillations so that the circuits receiving the signal only sees one circuit open or closer.
There are three basic ways to debounce a switch; Purchase a stand-alone Switch Controller to handle the problem, Use an RC circuit to damp-out the circuit oscillations, Or if possible read the switch position many times to determine when the switch settles out.
Microprocessor Control: If the circuit or switch is being read by a uP than it's possible to read the switch after the switch stops bouncing. The code is just written to see a transition and than wait a certain length of time to allow the switch bounce to subside.
Switch Controller: Maxim Integrated Products produces the MAX7347 as a stand-alone Switch Controller. Using another IC produces another line item in the PL, and additional cost. However the switch debouncers may perform other functions to inhance circuit operation.
RC Switch Debouncer Circuit: It's also possible to integrate the oscillations so that they are smoothed out, and the receiving circuit does not see them, but that requires an RC circuit.
