version 1.5 rev 4 Dec 2019
39
Sona &
Marana
4.7.8 R
olling
s
HUtteR
e
xteRnal
e
xposURe
t
RiggeRing
(o
veRlap
M
ode
)
In overlap mode, every positive edge of an external trigger will trigger a frame read out and start a new exposure for the
next frame. The period of external trigger pulse defines exposure and cycle time for each frame read out.
On detection of the positive edge a frame read out is initiated at the start of the next Row read period. This frame is
discarded as it does not contain the correct exposure period. Reading out this first frame effectively begins the first
exposure. When the next positive edge of the external trigger is detected, a signal frame read out is initiated at the start
of the next Row read period. As each row is read out, the new exposure for that row begins.
Figure 14: External Exposure “long” (overlap)
Parameter
Minimum
Maximum
Exposure
1 Frame + 2 Row
30 s
Cycle Time (1/Frame Rate)
Exposure
Exposure
External Start Delay
6.6 ns
1 Row
EXT Trig Pulse Width
2 rows
-
FIRE low period
6 μs (12-bit)
11 μs (16-bit)
-
