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Acute Technology Inc.
Copyright
2018
The use of a hardware surge filter (that is, Low-Pass Filter) may filter out the noise (Glitch)
and solve this problem, but may filter out true noise or high frequency signals. Therefore,
the use of hardware surge filter is not suitable for solving such problems.
Therefore, the appropriate approach is to use two sets of thresholds to determine the digital
signal. In electronics, the use of Schmitt Trigger will cause the phenomenon of hysteresis
on the voltage signal, thus eliminating noise interference and solving the phenomenon of
signal jitter (transient state).
When using Schumacher Circuit functions, both channels must be used for measurements.
Therefore, each measurement point must be connected with two test lines to form two sets
of thresholds. As there is no limit on which set should be Threshold-High or Threshold
High, you can arbitrarily select either one.
Threshold of the first set is A0-A15
Threshold of the second set is A16-A31
In actual wiring, the two sets must be paired. For example, A0 and A16 are paired, A1 and
A17 are paired, and so on.
The rules for logic judgment are: The signal voltage to be measured must exceed
Threshold-High to be logic 1, and when the signal drops, the signal voltage to be measured
must be lower than Threshold-Low to be recognized as logic 0. Those signals between the
Threshold-High and Threshold-Low are falling in the non-transposed area. The last logical
state is shown as below:
