Fairchild CAM/CMOS-2K.LS user manual Mode 1 Freerunning

Figure 3.4.1 -- Mode 1: Freerunning

...in this basic mode, usually used for diagnostics & debugging,

no triggering is applied to the camera...

...instead, the camera drives the system with the LineValid Camera Output.

			The Line Period and Integration
				tLinePeriod
n							n+1
		tReset				tIntegrationMax
	tInitiation
						may be shortened
					with the Command Software

LineValid

Camera Output

tXFR

tReadout

2048 Clock Cycles Data Camera Output

1 2 3 1023 1024

Strobe Camera Output

Line Valid Camera Output

Notes specific to this mode

1The camera is not triggered -- instead, the camera itself synchronizes the system. This is the default mode set by the factory

2The camera internally initiates readout of line "n" on its own. LineValid goes high a time "tXFR" afterwards

3The user must synchronize motion of the material moving past the camera to the camera's LineValid output

4The user must synchronize collection of data in the PC frame grabber to the LineValid camera output

5While LineValid is high, data may be sampled on rising edges of Camera Strobe Output for the 2048 clock cycles of readout as shown in the inset above; this is the same for all four modes

6A time "tInitiation" after the camera internally initiates the readout-and-integration cycle, the camera also internally initiates pixel reset; Integration then begins time "tReset" later, with this integrated information to be read out in the subsequent line "n+1"

7The factory-set default is for integration to run until the end of the line period, which results in a maximum

integration time "tIntegrationMax" = "tLinePeriod" - "tReset" - "tInitiation".

8 The line period "tLinePeriod" and the integration time "tIntegration" are selected by the user with the Command Software

Fairchild Imaging • CAM/CMOS-2K.LS Line Scan Camera User’s Manual • Rev C• 21 of 42