qCMOS Camera C15550-20UP / C15550-20UP01 Instruction manual_Ver.1.3
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(3) Level trigger mode
The Level trigger mode is used to control both exposure start timing and exposure time length by
inputting external trigger pulses. In this mode, the camera starts exposure at the start of high or
low period of the input trigger pulse and stops exposure at the end of high or low period of the
input trigger pulse. The example below is for the trigger level High. The exposure of the first- and
second- lines begin when the trigger signal becomes High, and the exposure of the third- and
fourth- lines begin after the readout time of first- and second-lines pass. Each exposure begins
one by one for every two lines. The exposure of the first- and second- lines are finished when the
trigger signal becomes low, and signal readout is begun. The exposure time of each line is defined
by the time that the input trigger is high.
Figure 11-7 (Ex. level High)
* Delay + Jitter = 4H + Maximum. 1H
Standard scan: 1H = 7.2 µs
Ultra quiet scan: 1H = 172.8 µs
