IC-LFL1402_17 Datasheet, PDF (7/9 Pages) IC-Haus GmbH – 256x1 LINEAR IMAGE SENSOR

iC-LFL1402
256x1 LINEAR IMAGE SENSOR
254 255 256 1
2
3
4
...
CLK
Rev A5, Page 7/9
255 256 257 258 259
SI
V(AO)
Pix254 Pix255 Pix256 Pix1
Pix2
Pix3
...
Pix255 Pix256
Pix1
SNH
SNH256
NRCI
Integration Time
Figure 6: Clock pulse continued without giving a new integration start signal
Operation with the shutter function
Integration can be stopped at any time via pin DIS,
i.e. the photodiodes are disconnected from their corre-
sponding integration capacitor when DIS is high and the
current integration capacitor voltages are maintained. If
this pin is open or switched to GND the pixel photocur-
rents are summed up by the integration capacitors until
the next successive SI signal follows.
1
2
3
4
5
6 ...
255 256 1
CLK
SI
SNH
NRCI
DIS
PIX SAMPLE−C
Integration
Disabled
Integration
Enabled
Integration
Disabled
Figure 7: Defining the integration time via shutter input DIS
External bias current setting
In order to reduce the power consumption of the device
an external reference current can be supplied to pin
RSET which reduces the maximum readout frequency,
however. To this end a resistor must be connected
from VCC to RSET. If this pin is not used, it should be
connected to GND.