PI331MC-DR Datasheet, PDF (3/9 Pages) AMI SEMICONDUCTOR – 300DPI CIS Two Level Digital Output Module

DOCUMENT SURFACE
LIGHT PATH
GLASS WINDOW
BAR
LED
PCB
SENSORS
Figure 2. INSIDE PICTORIAL OF THE MODULE
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
IMAGE
PIXELS
FROM
THE
CIS
REFERENCE
LEVEL
GENERATOR
COMPARATOR
TWO
LEVEL
DIGITAL
OUTPUT
FIGURE 3. ANALOG SIGNAL REFERENCE
GENERATOR AND A SINGLE BIT COMPARATOR
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.
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