44
9.6.5 Debouncer
The basic idea behind this feature was to separate interfering signals (short peaks) from
valid square wave signals, which can be important in industrial environments. Debouncing
means that invalid signals are filtered out, and signals lasting longer than a user-defined
testing time t
DebounceHigh
will be recognized and routed to the camera to induce a trigger.
In order to detect the end of a valid signal and filter out possible jitters within the signal,
a second testing time t
DebounceLow
was introduced. The timing for this can also be adjusted
by the user. If the signal value falls to state low and does not rise within t
DebounceLow
, this is
recognized as the end of the signal.
The debouncing times t
DebounceHigh
and t
DebounceLow
are adjustable from 0 to 5 msec in incre-
ments of 1 μsec.
low
high
U
t
0
4.5V
11V
30V
low
high
U
t
0
4.5V
11V
30V
t
∆t
1
∆t
x
high time of the signal
t
DebounceHigh
user defined debouncer delay for state high
t
DebounceLow
user defined debouncer delay for state low
t
DebounceHigh
∆t
2
∆t
3
∆t
4
∆t
5
∆t
6
t
DebounceLow
Incoming signals
(valid and invalid)
Debouncer
Filtered signal
9.6.6 Flash Signal
This signal is managed by exposure of the sensor.
Furthermore, the falling edge of the flash output signal can be used to
trigger a movement
of the inspected objects. For this reason, the span time used for the sensor readout t
readout
can be used in industrial environments.
Debouncer:
Please note that the edges
of valid trigger signals are
shifted by t
DebounceHigh
and
t
DebounceLow
!
Depending on these
two timings, the trigger
signal may be temporally
stretched or compressed.
Summary of Contents for USB3 Vision
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Page 5: ...5 15 Warranty Notes 57 16 Support 57 17 Conformity 17 1 CE 17 2 RoHS ...
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