Falling Edge
Image capture begins when a ‘logic-1’ to ‘logic-0’ transition
occurs on the trigger inputs.
Image capture ends when ‘limit number of frames to’ or ‘limit time
to’ has been met.
While High
Image capture begins when a ‘logic-1’ signal is present on the
trigger inputs.
Image capture ends when ‘logic-1’ to ‘logic-0’ transition occurs on
the trigger inputs.
While Low
Image capture begins when a ‘logic-0’ signal is present on the
trigger inputs.
Image capture ends when ‘logic-0’ to ‘logic-1’ transition occurs on
the trigger inputs.
Electrical
The external trigger input is optically isolated from the rest of the VCE-
Considerations
PRO hardware. An internal 300 ohm series resistor is used to limit the
input current. The input signals “TRIGGER IN +” and “TRIGGER IN -”
are used to connect to an external trigger source.
A ‘logic-0’ is considered a positive voltage ( between TRIG
and TRIGGER_IN - ) of 0v to 1.0v.
A ‘logic-1’ is considered a positive voltage ( between TRIG
and TRIGGER_IN - ) of 4.0v to 5.0v.
TRIGGER_IN -
TRIG
+3.3V
+3.3V
U12
NC7SZ125
2
4
3
5
1
IN
OUT
GN
D
V
C
C
OE
D1
BAS16LT1
C134 0.1uF
R64
10K
U13
HMHAA280
1
2
4
3
ANO
CAT
COL
EMT
C133
0.1uF
R63 300
R65
100
J8
stereo phono jack
3
2
1
VIDEO_TRIGGER_L
Figure 5 – External trigger schematic
CAUTION NOTE
The maximum input current MUST NOT exceed 10mA or else damage may
occur to the card!
Page
42 of 44
