I/O to the module is a 8-pin flex cable connector (See I/O Connector, under

Specifications) located on one end of the module. The connector is on the top of the

module with the glass window facing down and it is located on the opposite side of the

module. See the Mechanical Housing under Mechanical Structure.

Circuit Description and Operation

See Figure 3 a simplified block diagram of the analog tracking digitizer. Fundamentally,

the tracking digitizer transforms the signal output from a CIS module existing on the

market today. It takes the analog signal from the CIS section of PI331MC-DR and derives

a tracking background reference signal. Then this reference is compared against the

output signals from the CIS section. The resulting signal from comparison produces a two-

level digital signal that is high when the pixel signal is brighter than the background and

remains at zero as long as the signal is darker than the background signal.

PAGE 3 OF 9 - PI331MC-DR, 11-8-00

GLASS WINDOW

DOCUMENT SURFACE

LIGHT PATH

SENSORS

PCB

LED

BAR

Figure 2. INSIDE PICTORIAL OF THE MODULE

IMAGE

PIXELS

FROM

THE

CIS

REFERENCE

LEVEL

GENERATOR

COMPARATOR

TWO

LEVEL

DIGITAL

OUTPUT

FIGURE 3. ANALOG SIGNAL REFERENCE

GENERATOR AND A SINGLE BIT COMPARATOR