VCC-G20V30A
Rev.900-621-34-00
©2010 CIS Corporation. All rights reserved.
11
Pulse width trigger shutter mode 1 (Sync Reset Mode)
At pulse width trigger shutter mode, exposure time and shutter value can be set by trigger pulse width.
With trigger input, images can be captured at any timing.
Internal SYNC and VD are reset right after completion of exposure so that the video output signals are read out
at the shortest timing. HD external input is valid but VD external input invalid.
Exposure time = Trigger pulse width (
μ
s) + 5
μ
s typical
Conditions: Trigger input pulse width shall be 4
μ
s
～
250ms, Positive Logic
The shortest trigger cycle = 1 frame + 5H
Pulse width trigger shutter mode 2 (Sync Non-Reset Mode)
At pulse width trigger shutter mode, exposure time and shutter value can be set by trigger pulse width.
With trigger input, images can be captured at any timing.
Signals are read out after waiting for the external VD (single) input so that the timing to read out video output
signals can be controlled externally. The down edge phase of external HD/VD signals should be matched.
The time frame between down edge of trigger input and to add single VD externally shall be set 10
μ～
35ms.
Exposure time = Trigger pulse width (
μ
s) + 5
μ
s typical
Conditions: Trigger input pulse width shall be 4
μ
s
～
250ms, Positive Logic
The shortest trigger cycle = Trigger pulse width + VD waiting time + 1 frame + 2H
Caution 1: When the next trigger is input before the completion of video signals output for the prior trigger,
the images could be improper.
Caution 2: Smear or blooming could occur when strong incident light is extensively illuminated, with setting the
electric shutter at high speed. To avoid this smear or blooming, lower the volume of incident light or
use a stroboscopic light source to control the light volume.
Caution 3: Please refer to the exposure timing chart below for the actual timing to start exposure after adding
trigger input, and or for the actual timing to complete exposure at pulse width trigger shutter
operation.
