Programmable Filtering
Original instructions
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At a Glance
The BMX EHC 0200 counting module’s six inputs are compatible with the use of mechanical switches.
A programmable debounce filter with 3 levels (low, medium and high) is available at every input.
Debounce Filter Diagram
The figure below shows the debounce filter with a low filtering level:
In this mode, the system delays all transitions until the signal is stable for 450 μs.
Selecting the Filtering Level
The table below specifies the characteristics of each input for the selected level of filtering:
Filtering level
Input
Maximum delay
Minimum pulse
Maximum frequency
None
IN_A, IN_B
-
5 μs
60 KHz
IN_SYNC
-
5 μs
200 Hz
IN_EN
50 μs
-
-
IN_CAP, IN_REF
-
50 μs
200 Hz
Low
for bounces > 2 KHz
IN_A, IN_B
-
450 μs
1 KHz
IN_EN
450 μs
-
-
IN_SYNC, IN_CAP, IN_REF
-
500 μs
200 Hz
Resource
for bounces > 1 KHz
IN_A, IN_B
-
1.25 ms
350 Hz
IN_EN
1.25 ms
-
-
IN_SYNC, IN_CAP, IN_REF
-
1.25 ms
200 Hz
High
for bounces > 250 Hz
IN_A, IN_B
-
4.2 ms
100 Hz
IN_EN
4.2 ms
-
-
IN_SYNC, IN_CAP, IN_REF
-
4.2 ms
100 Hz