Version 1.0 rev 14 Aug 2019
39
Balor
1 Row is the time taken to perform 616 (504 in Rolling Shutter - 100% Duty Cycle) clock cycles. The sensor read out is
designed to digitise 4 rows simultaneously hence a Full Frame readout is 4104/4 rows x 616 clock cycles.
“T
res
” is the extra time added to an exposure to account for the relative position within a Row Time of the start and end of
an exposure.
For sub-images the frame readout time scales approximately with the number of rows being read out.
In External and External Start Triggering Modes, the minimum trigger pulse width detected by the camera is shown
below in Table 4:
Table 4: Minimum EXT trigger width.
Parameter
Sensor Read out Rate
EXT Trig Pulse Width (2 clock cycles)
71 ns
4.9.4 R
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nteRnal
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RiggeRing
Internal Trigger Mode allows the user to configure an exposure time and cycle time. For Internal Triggering, the exact
acquisition sequence depends on the exposure time and cycle time set as shown in Figures 11 to 13. The following
diagrams show the behaviour of TTL outputs ‘FIRE’, FIRE N’, ‘FIRE ALL’ and ‘FIRE ANY’.
Initially, the entire sensor is held in a global clear state to ensure that there is no charge build-up on the sensor, once
the acquisition sequence starts the sensor switches to Rolling Shutter and a Reset phase starts. This starts the
actual exposure. When the exposure period has completed, a signal frame read out phase begins. When safe a new
continuous rolling reset is started and lasts until the user specified cycle time has been reached at which point a normal
Reset phase is started to start the next exposure. This sequence continues until the full acquisition sequence specified
by the user as completed.
Figure 11: Rolling Shutter Internal Triggering (Part 1: exposure time < readout time).