AVAL APX-3302, Руководство пользователя

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APX-3302 User's Manual (OM110000019A)
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6.10 Encoder input
APX-3302 has encoder input interface.
6.10.1 Encoder input circuit
APX-3302 has the incremental type encoder input circuit of RS422 interface.
It can control exposure and image input timing interlocked with external devices (shaft encoder etc.).
For the count of encoder signal, quad edge evaluation that using encoder A,B phase and double edge
evaluation that using only encoder A phase are available. Encoder Z phase is available for using as start
timing of encoder.
Moreover, it is also possible to use external trigger signal as a trigger to start encoder count up.(For using
external trigger as a trigger to start encoder count up, you need to input trigger for each frame.)
The input frequency of encoder can be inputted to 1 MHz the maximum.
The encoder input timing must be kept the following regulations.
A Phase
B Phase
1uS(min)
250nS(min)
Figure6-26: Encoder input timing
The Duty ratio of an input impulse wave must be kept 50%.