PI214MC-DR Datasheet, PDF (4/8 Pages) AMI SEMICONDUCTOR – 200DPI CIS Two Level Digital Output Module

Figure 1, PI214MC-DR block diagram depicts the two basic circuits, the CIS (image
sensors and video amplifier) and the tracking digitizer. In the CIS section, the module
has 27 serially concatenated PI3004B image sensors, accordingly, the image sensors
will span one scanning-read line width that is 27 sensor times 64 pixel elements/sensor,
or 1728 pixel elements.
In operation the module produces the analog image pixel signals that are proportional to
exposure on the corresponding picture element on the document (the video signal) then
passes the signal to the tracking digitizer. In turn, the digitizer processes the analog
image pixels to digital image pixels. The analog image pixels, at test point TV, are
separated into two signals. One generates the reference signal and the other remains
unmodified. These unmodified image pixels are applied to one of the input of the
comparator. The reference signal is applied to the second input of the comparator. The
results of the comparison are the digital image pixels. This digital output is produced in
two levels, determined by the difference between the background reference signal and
the analog image pixels. A digital pixel output of value “one” represents the analog
image pixel that is brighter than the background and digital pixel level of value “zero”
represents the image pixel that is darker than background.
Specifications
I/O Connector
The table of pins and their functions are listed in Table I, Pin Configuration.
Pin Number
1,2,4&8
3
5&6
7
9&10
11&12
13&14
15&16
Symbol
GRD
DIGOUT
VDD
SP
Vn
Clock (CP)
GLED
VLED
Names and Functions
Ground; 0 V
Digital Video Output
Positive Power Supply
Start Pulse for the shift register
Negative Power Supply
Clock for the shift register
Return for the LED light source
Power in for the LED light
source.
Table 1. Pin Configuration
Inputs:
There are five inputs:
• Clock (CP): This is the input for the main sampling clock.
• SP: This is the start pulse input for initiating the scan.
• VDD: This is an input for the + 5 Volts positive supply.
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