AMIS-720649 Datasheet, PDF (8/10 Pages) AMI SEMICONDUCTOR – Contact Image Sensor

AMIS-720649: Contact Image Sensor
Data Sheet
Figure 4 shows the initialization of the first sensor in relation to its subsequent cascaded sensors. The SIC selects the first sensor to
operate with 29 clock cycles of delay by connecting it to Vdd on the first sensor and to ground for all subsequent sensors. Hence the
first sensor will operate with 29 inactive pixels being clocked out before its first active pixel is clocked out. The rise and fall times are
listed in Table 5. The SO comes out in line with the second last active pixel, and the last active pixel of each sensor is the 344^th pixel
which coincides with the 344^th clock cycle.
GBST
CLK
SO
VOUT
1
2
3
26 27 28 29 30 31 32 33 34 35 36
29 Inactive pixels (29 Clocks)
1
2
3
45
6
7
344 Active Pixels (344 Clocks)
CLK
GBST
VOUT
CLKpw
CLKpw
Thold
Tset
CLKp
50%
CLKrt
GRSTrt
GRSTft
prt
90%
pft
10%
Figure 4: Overall Timing Diagram
CLKft
Last pixel of preceding sensor
First pixel of succeding sensor
1
2
3
4
1
2
3
4
CLK
Thold
GBST
Tset
1
2
Thold
Tset
29 30 31 32
Video Signal (Vout)
1
2
3
Figure 5: Timing of GBST-to-first Pixel of the First Sensor
AMI Semiconductor – Dec. 05, M-20488-001
8
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