AX92352/AX92353 2-CH Encoder Card with Real-time Trigger I/O
18
Operating
4.1.7
Trigger Input/ Output
Trigger input supports de-bounce filter function to help filter out environmental noise that
can mix with normal encoder signals and affect the accuracy of the pulse count. The
de-bounce filter defines the interval width for high/low signals. Signals with interval width
less than the defined value will be filtered out.
Below is a diagram illustrating the case of filter timer set with a duration time of 2
milliseconds:
Trigger Output CH 0~4 provides the following parameters to configure:
Trigger source
The user can select any of the following items as a triggering condition that prompts
the AX92352 to generate a trigger output: Trigger Input CH 0~3, Encoder 0_Linear 0,
Encoder 0_Linear 1, Encoder 0_FIFO, Encoder 1_Linear 0, Encoder 1_Linear 1,
Encoder 1_FIFO
Note:
One trigger source can be set to activate multiple trigger outputs.
Delay time
The user can set the delay time that the system waits before it sends a trigger
output.
Duration time
The user can adjust pulse width for the output signal.
(Definitions of delay time and duration time are illustrated below):
Invert
The condition of trigger source can be set as rising trigger or falling trigger.
Trigger input
signal
Filtered
signal
<2ms
2ms
<2ms
2ms
<2ms
Trigger Source
Trigger Output
Delay Time
(OFF)
Duration
(ON)
