Digital Hysteresis

Operator Menu Location: Signal Conditioning

Operator Bitmap:
 

Functional Description:
The Digital Hysteresis operator filters spurious switching on a boolean input signal. Its output generally tracks its input signal value, but will delay changing state in response to an input signal change until the input stabilizes. For the output to change from LOW to HIGH, the input must change from LOW to HIGH and remain HIGH for a user-specified length of time-the Switch to HIGH Delay time. Likewise, for the output to switch from HIGH to LOW, the input signal must switch from HIGH to LOW and remain LOW for a user-specified length of time-the Switch to LOW Delay time.

User-Defined Properties:
Object Name. A string label that identifies the operator

Initial State. The output state (HIGH or LOW) at startup (at time t=0)

Switch to LOW Delay. The length of time (in seconds) that the input signal must remain LOW for the output to switch from HIGH to LOW.

Switch to HIGH Delay. The length of time (in seconds) that the input signal must remain HIGH for the output to switch from LOW to HIGH.

Comments:
•Design Pad will issue an error on processing if the input pin is not connected
•The Switch to LOW Delay time must be greater than or equal to zero
*•*The Switch to HIGH Delay time must be greater than or equal to zero

See Also:
Timer Delay