™
Peripheral
Imaging
Corporation
PI225MC-A6 CIS Module
200DPI CIS Sensor
Engineering Data Sheet
Key Features
• Light source, lens, and sensor are integrated into a single module
• 8 dpm resolution, 104 mm scanning length
• High Speed Page Scan - up to 167
µsec/line
@ 5MHz pixel rate
• Wide dynamic range
• Analog output
• Red LED light source
• Compact size
≅
14 mm x 19 mm x 120 mm
• Low power
• Light weight
General Description
The PI225MC-A6 is a contact imaging sensor, CIS, module, which is composed of 13
PI3020 sensor chips. The PI3020 is a 200 DPI solid-state line imaging array, also a
product of Peripheral Imaging Corporation. This imaging device is fabricated using MOS
imaging sensor technology for high-speed performance and high sensitivity. The
PI225MC-A6 is suitable for scanning A6 size (104 mm) documents with 8 dots per
millimeter resolution. Applications include ticket, check and card scanners, variety of mark
readers, and other automation equipment.
Functional Description
The PI225MC-A6 imaging array consists of 13 sensors that are cascaded to provide 832
photo-detectors with their associated multiplex switches, and a digital shift register that
controls its sequential readout. Mounted in the module is one-to-one graded indexed
PAGE 1 OF 6 - PI225MC-A6, 8/25/00
micro lens array that focuses the scanned documents to image onto its sensing plane.
The on-board amplifier processes the video signal to produce a sequential stream of video
at the video output pin of the PI225MC-A6 module.
Illumination is by means of an integrated LED light source. All components are housed in
a small plastic housing which has a cover glass which acts as the focal point for the object
being scanned and protects the imaging array, micro lens assembly, and LED light source
from dust. I/O to the module is the 10-pin connector located on one end of the module.
The cross section of the PI225MC-A6 is shown in Figure 1 and the block diagram in
Figure 2.
DOCUMENT SURFACE
GLASS WINDOW
LIGHT PATH
MODULE HOUSE
ROD LENS
D
LE
R
BA
SENSORS
PCB
INSIDE PICTORIAL OF MODULE
Figure 1. PI225MC-A6 Cross Section
GLED
LED
LED
LED
LED
LED
LED
LED
LED
VLED
ROD LENS
830
PHOTO SENSORS
1
2
3
4
5
----------------
831
832
VIDEO
LINE
VN(-V)
VDD (+5)
SHIFT REGISTER
GRD
BUFFER
VIDEO AMPLIFIER
VOUT
CP
SP
GRD
Figure 2. PI225MC-A6 module block diagram
PAGE 2 OF 6 - PI225MC-A6, 8/25/00
Table 1. Pin Configuration
Pin Number
1
2
3
4
5
6
7
8
9
10
Symbol
Vout
Gnd
Vdd (+5V)
Vn (-5V to –12V)
Gnd
SP
Gnd
CP
GLED
VLED
Names and Functions
Analog Video Output
Ground; 0V
Positive power supply
Negative power supply
Ground; 0V
Shift register start pulse
Ground; 0V
Sampling clock pulse
Ground for the light source; 0V
Supply for the light source
Table 2. Absolute Maximum Rating:
Parameter
Symbols
Power supply voltage
Vdd
Idd
Vn
In
VLED
ILED
Input clock pulse (high level) Vih
Input clock pulse (low level) Vil
Table 3. Operating Environment
Operating temperature
Top
Operating humidity
Hop
Storage temperature
Tstg
Storage humidity
Hstg
Maximum Rating
7.5
40
-15
15
5.5
500
Vdd – 0.5V
-0.6
Units
V
ma
V
ma
V
ma
V
V
0
0 to 50
10 to 85
-25 to+75
5 to 95
C
%
0
C
%
PAGE 3 OF 6 - PI225MC-A6, 8/25/00
Electro-Optical Characteristics (25° C)
Table 4. Electro-optical characteristics at 25° C.
Parameter
Symbol
Number of photo detectors
Pixel to pixel spacing
Line scanning rate
Tint
(1)
Parameter
832
125
180
Units
elements
µm
µsec
Note
Tested @
5 MHz
clock
frequency
Test at
Tint=180ms
Clock frequency
(2)
Bright output voltage
(3)
Bright output
nonuniformity
(4)
Adjacent pixel
nonuniformity
(5)
Dark nonuniformity
(6)
Dark output voltage
Modulation transfer
function
(7)
f
Video Output
Up
Uadj
Ud
Vd
MTF
5
1.0
<+/-30
<25
<20
<200
>50
MHz
V
%
%
mV
mV
%
See note 7
for MTF &
DOF.
Definition:
(1) Tint: Line scanning rate or integration time. Tint is determined by the interval of two
SP, start pulses. The module was test at 180ms, but it will operate to 167ms with
clocking speed of 5.0MHz.
(2) f: main clock frequency. The module was tested at 5.0 MHz, but electrically it reliably
operates above 5.0 MHz, but with a minimum integration time of 167
µsec.
(3) Vpavg =
∑
Vp(n)/832
(4) Up = [(Vpmax - Vp) / Vp] x 100% or [(Vp - Vpmin) / Vp] x 100%
(5) Upadj = MAX[ | (Vp(n) - Vp(n+l) | / Vp(n)] x 100%
Upadj is the nonuniformity percentage pixel to pixel
(6) Ud = Vdmax - Vdmin
Vdmin is the minimum output on a black document(O.D.=0.8)
Vdmax: maximum output voltage of black document (O.D.= 0.8)
(7) MTF = [(Vmax - Vmin) / (Vmax + Vmin)] x 100 [%]. DOF range is defined with the MTF.
MTF is measure at glass surface and at 0.4mm from the glass > 50% and peaks at
approximately mid-point of 0.2mm.
Vmax: maximum output voltage at 50 lp/inch (At 1/2 of the optical Nyquest Frequency)
Vmin: minimum output voltage at 50 lp/inch
(8) O.D. = Optical Density
(9) lp / inch: line pair per inch
PAGE 4 OF 6 - PI225MC-A6, 8/25/00
Table 5. Recommended Operating Conditions (25 °C)
Item
Power Supply
Symbol
Vdd
Vn.
VLED
Idd
In
ILED
Vih
Vil
f
Min
4.5
-4.5
Mean
(1)
5.0
-5
5
30
6
300
Vdd-.5
Max
5.5
-12
5.5
40
15
450
Vdd
0.6
5.0
(2)
Units
V
V
V
ma
ma
ma
V
V
MHz
%
ns
ms
0
C
Input voltage at digital high
Input voltage at digital low
Clock frequency
Clock pulse high duty cycle
Clock pulse high duration
Integration time
Operating temperature
Vdd-1.0
0
25
50
0.167
Tint
(3)
Top
25
5.0
50
(1) Tested at 5.0MHz and 180ms.
(2) Also used as test frequency.
(3)Tint (Min) is the lowest line integration time available at 5.0 MHz clock rate.
Switching Characteristics (25°C)
to
CP
tprh
tdh
SP
tds
Vout
tsh
tw
tdl
MODULE TIMING DIAGRAM
Figure 3. Clock and Start Pulse Timing Diagram
The switching characteristics for the I/O clocks are shown in Figure 3. Its corresponding
definition for the timing symbols are given in Table 5, below.
PAGE 5 OF 6 - PI225MC-A6, 8/25/00
