Andor Technology Zyla sCMOS 5.5 - Rolling Shutter External Exposure Triggering (Overlap Mode)

version 2.0 rev 18 Feb 2021
37
2.6.2.7 Rolling Shutter External Exposure Triggering (Overlap Mode)
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denesexposureandcycletimeforeach
frame read out.
While waiting on the positive edge of the external trigger, the sensor is held in a global clear state and put into
a “pre-scan read out cycle”. On detection of the positive edge, Global Clear goes LOW and a frame read out is
initiated.Thisframeisdiscardedasitdoesnotcontainthecorrectexposureperiod.Readingoutthisrstframe
eectivelybeginstherstexposure.Whenthenextpositiveedgeoftheexternaltriggerisdetected,asignal
frame read out phase begins. As each row is read out, the new exposure for that row begins.
Figure 21: Rolling Shutter External Exposure Triggering (Overlap Mode) (Long Exposures)
Table 17: Rolling Shutter External Exposure Triggering (Overlap Mode) Timing Parameters
Parameter Minimum Maximum
Exposure 1 Frame + 1 Row 30 s
Cycle Time (EXT Trig Period) Exposure Exposure
External Start Delay 0 1 Row
EXT Trig Pulse Width 2 Sensor Speed Clock Cycles -
FIRE low period 20 Sensor Speed Clock Cycles -