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ElectShutter
Camera Input
ExSync
Camera Input
LineValid
Camera Output
Notes specific to this mode
1 The user initiates the reset-&-integration cycle by taking the ElectShutter Camera Input high
2 The user terminates integration by taking the ElectShutter Camera Input low
3
ElectShutter will not be recognized by the camera until a time "t
x2p
" after ExSync is brought low
4 If ElectShutter is brought high earlier than constrained above, the camera will interpret this as ElectShutter
going high "t
x2p
" after ExSync went high
5 Any software command setting integration time is overridden by ElectShutter Camera Input
6 If ElectShutter is still high when ExSync is taken low to initiate the next readout cycle, then integration is
immediatel
y
terminated
7 The user can read data from the CAM/CMOS - 2K.LS while LineValid is high as shown above.
Table 3.4.5 -- Mode 4: ExSync Synchronization and Electronic Shutter Control
...this mode gives the user full asynchronous hardware control over start and end of integration
with the "ElectShutter" Camera Input.
t
XFR
t
LinePeriod
t
Readout
2048 Clock Cycles
t
Reset
n
n+1
t
Wait
>t
x2p
t
Integration
Data Camera Output
Strobe Camera Output
Line Valid Camera Output
1 2 3 2047 2048
>t
MinSync
t
HoldLow
t
HoldHigh
>t
Setup
Fairchild Imaging • CAM/CMOS-2K.LS Line Scan Camera User’s Manual • Rev A • 23 of 41