Figure 1, PI331MC-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

11 serially concatenated PI3012A image sensors, accordingly, the image sensors will

span one scanning-read line width that is 11 sensor times 96 pixel elements/sensor, or

1056 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

Symbol

Names and Functions

1

DIGOUT

Digital Video Output

2

Vdd (+5 V)

Ground; 0 V

3

Vn (-10 to -5V)

Negative power supply

4

SP

Start Pulse for the shift register

5

GRD

Ground; 0 V

6

CLOCK

Clock for the shift register

7

GLED

Return for the LED light source

8

VLED

Power in for the LED light

source.

Table 1. Pin configuration

The connector is a 8-pin 1-mm surface mount flex input, Molex 52207-0890.

Inputs:

There are five inputs:

• Clock is on Pin 6 of the I/O Connector. This is main clock input into the CIS Module.

• SP is on Pin 4. This is the start clock input to the CIS Module.

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