™
Peripheral
Imaging
Corporation
PI226M-A4 CIS Module
200DPI CIS Sensor
Engineering Data Sheet
Key Features
• Light source, lens, and sensor are integrated into a single module
• 8 dpm resolution, 216 mm scanning length
• Electrically 347µsec/line scanning speed possible with optional light sources
• YELLOW-GREEN LED light source, limits the typical line scan to 695
µsec
@ 2.5 MHz
• Wide dynamic range
• Analog output
• Compact size
≅
14 mm x 19 mm x 232 mm
• Low power
• Light weight
General Description
The PI226M-A4 is a CIS module. It is a contact image sensor, using MOS image sensor
technology for high-speed performance and high sensitivity. The PI226M-A4 is suitable for
scanning A4 size (216 mm) documents with 8 dots per millimeter resolution. Applications
include fax machines, game systems, variety of mark readers, and other automation
equipment requiring document scanners.
Functional Description
The PI226M-A4 imaging array consists of 27 sensors, PI3020 produced by Peripheral
Imaging Corp, that are cascaded to provide 1728 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 micro lens array that focuses on the image of
the scanned documents then transfers it onto the sensors. The on-board amplifier
Page 1 of 6 - PI226M-A4, 2-22-02
processes the video signal to produce a sequential stream of video at the output pin of the
PI226M-A4 module.
Illumination is by means of an integrated Yellow-Green LED light source. All components
are housed in a small plastic housing which has a cover glass that acts as the focal point
for the object being scanned, 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. For pin 1 location, see Figure 4, The Overall View of the Module House.
The cross section of the PI226M-A4 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. PI226M-A4 Cross Section
GLED
LED
LED
LED
LED
LED
LED
LED
LED
VLED
ROD LENS
1726
PHOTO SENSORS
1
2
3
4
5
----------------
1727
1728
VIDEO
LINE
VN(-V)
VDD (+5)
SHIFT REGISTER
GRD
BUFFER
VIDEO AMPLIFIER
VOUT
CP
SP
GRD
Figure 2. PI226M-A4 module block diagram
(See Table 1 for pin-out designation)
Page 2 of 6 - PI226M-A4, 2-22-02
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 1. Pin configuration
Symbols
Vdd
Idd
Vn
In
VLED
ILED
Input clock pulse (high level) Vih
Input clock pulse (low level) Vil
Parameter
Power supply voltage
Maximum Rating
7
60
-15
7
6.0
1.2
Vdd
-0.5
Units
V
mA
V
mA
V
A
V
V
Table 2. Absolute Maximum Ratings
Note, these are the maximum ratings and are not to be used in prolonged conditions.
Operating Environment
Operating temperature
Operating humidity
Storage temperature
Storage humidity
Top
Hop
Tstg
Hstg
0 to 50
10 to 85
-25 to+75
5 to 95
0
C
%
0
C
%
Table 3. Operating Environment
Page 3 of 6 - PI226M-A4, 2-22-02
Table 4. Electro-optical characteristics at 25° C.
Parameter
Symbol
Number of photo detectors
Pixel to pixel spacing
Line scanning rate
Tint
(1)
Parameter
1728
125
695
Units
elements
µm
µsec
MHz
Volts
%
%
mV
mV
%
Note
@ 2.5 MHz
clock
frequency
Clock frequency
(2)
Bright output voltage
Bright output
nonuniformity
(4)
Adjacent pixel
nonuniformity
(5)
Dark nonuniformity
(6)
Dark output voltage
(6)
Modulation transfer
function
(7) (8)
fclk
Vpavg
Up
Uadj
Ud
Vd
MTF
2.5
1.0 +/-0.1
<|+/-30|
<25
<75
<200
>40
Definition:
(1) Tint: Line scanning rate or integration time. Tint is determined by the interval of two
SP, start pulses. This integration time of 695
µsec
typically set at the factory for Yellow-
Green LED. The minimum integration time of 347us is available at 5.0 MHz pixel rate, but
it will require optional light sources.
(2) fclk: main clock frequency,
(3) Vpavg =
∑
Vp(n)/1728
(4) Up = [(Vpmax - Vpavg) / Vpavg] x 100% or [(Vpavg - Vpmin) / Vpavg] x 100%
(5) Upadj = MAX[ | (Vp(n) - Vp(n+l) | / Vp(n)] x 100%
Upadj is the nonuniformity in percent between adjacent pixels.
(6) Ud = Vdmax – Vdmin
Vd = the average dark output level.
Vdmin is the minimum output on a black document (LED is turned off)
Vdmax: maximum output voltage of black document (LED is turned off)
(7) MTF = [(Vmax - Vmin) / (Vmax + Vmin)] x 100 [%]
Vmax: maximum output voltage at 50 lp/in
Vmin: minimum output voltage at 50 lp/in
(8) lp / in: line pairs per inch
Page 4 of 6 - PI226M-A4, 2-22-02
Table 5. Recommended Operating Conditions (25 °C)
Item
Power Supply
Symbol
Vdd
Vn.
VLED
Idd
Ivn
ILED
Vih
Vil
fclk
Min
4.5
-4.5
4.5
25
4.0
350
Vdd-1.0
0
25
82
0.576
25
Mean
5.0
-5
5
30
4.0
560
Vdd-.5
Max
5.5
-12
5.5
35
5.0
790
Vdd
0.8
3.0
Units
V
V
ma
ma
ma
V
V
MHz
%
ns
ms
0
C
Input voltage at digital high
Input voltage at digital low
Clock frequency
(1)
Clock pulse high duty cycle
Clock pulse high duration
Integration time
(1)
Operating temperature
Tint
Top
5.0
50
Note:
(1) Electrically, including the image sensors, the circuits will operate above 5.5 MHz.
However, with the Yellow-Green light option, the light exposure limits the operation
to a maximum of 3.0MHz, hence the integration time, Tint of 0.576 ms.
Switching Characteristics (25°C)
to
CP
tprh
tdh
SP
tds
Vout
tsh
tdl
tw
MODULE TIMING DIAGRAM
Figure 3. Timing Diagram
The switching characteristics for the I/O clocks are in the above diagrams. See timing
symbol definitions in the following Table 6.
Item
Clock cycle time
Symbol
to
Min.
0.333
Typical
Max.
4.0
Units
µs
Page 5 of 6 - PI226M-A4, 2-22-02
