™
Peripheral
Imaging
Corporation
PI227MC-A4 / PI228MC-A4 / PI229MC-A4 CIS Module
200DPI CIS Sensor
Engineering Data Sheet
Key Features
•
Light source, lens, and sensor are integrated into a single module
•
Ultra-High-Speed
•
Four parallel analog video outputs clocked at 5.0MHz.
•
90 µsec/line scanning speed @ 5.0MHz clock rate with optional light sources, selected
from the option of three above modules.
•
8 dpm resolution, 216 mm scanning length
•
Wide dynamic range
•
LED light source (selectable among the three above modules)
•
Standard A4 size ≅ 14mm x 19 mm x 232 mm
•
Low power
•
Light weight
General Description
The PI227MC-A4, PI228MC-A4 and PI229MC-A4 are a family of CIS modules. As a
family group they are called PI227/228/229 modules. They are long contact image sensor
modules, using MOS image sensor technology for high-speed performance and high
sensitivity. They contain their own complete optical system including the light source,
accordingly, they make a very compact imaging system. The four parallel video outputs
gives these family of CIS modules their high speed performances. They all possess
identical electrical circuit components, as well as the mechanical and optical components,
except for their LED light sources. Accordingly they differ in their specification because the
different light sources limits the effective high speed performance. The three modules are
suitable for scanning A4 size (216 mm) documents with 8 dots per millimeter resolution.
PAGE 1 OF 10 - PI227/228/229, 01-31-04
Applications include document scanning, mark readers, gaming and office automation
equipment.
Functional Description
Each of the three modules in the family, PI227/228/229, consist of four major components.
The first of them is the PCB on which the 27 imaging chips, PI3020, are bonded. These
sensor chips, produced by Peripheral Imaging Corporation, are monolithic devices with 64
photo sensing elements. Each of twenty seven chips are complete self contained
scanning chips and have their control circuits integrated in the chips, so that they can be
cascaded to provide 1728 photo-elements module. The PI3020 chips are integrated with
the photo sensors' associated multiplex switches, a digital shift register and chip selection
switch. The chip's shift register sequentially clocks out the integrated image charges from
each sensing elements and passes them through the chip-select switch and out onto the
video line. The chip-select switches are sequentially switched as each of the predecessor
chip completes its scan. These 27 sensors, bonded on a PCB, are grouped into 4 subcascaded sections. Each contiguously cascaded chips section are connected on
separate video lines, accordingly providing four video outputs VOUT1, VOUT2, VOUT3
and VOUT4. Before the signal charges from the four video lines appear at their
respective outputs they are converted to signal voltages by four on-board buffer
amplifiers, one for each of its corresponding video section. The first three sections
VOUT1, VOUT2, and VOUT3 have 7 sensor chips, while the VOUT4 has 6 sensor chips.
Since each sensor chip have 64 pixels, there are a total of 1728 pixels. See Figure 1.
PI227/228/229 Module Block Diagram.
VN(-V)
GLED
LED
LED
LED
LED
LED
LED
LED
LED
VDD(+5)
VLED
GRD
ROD LENSE
PHOTO SENSORS
1728
AMPL 1
VOUT1
AMPL 2
VOUT2
AMPL 3
VOUT3
AMPL 4
VOUT4
1 2 3
SHIFT REGISTER
BUFFER
CP
SP
VIDEO 1 PIXEL 1 TO 448
VIDEO 2 PIXEL 449 TO 896
VIDEO 3 PIXEL 897 TO 1344
VIDEO 4 PIXEL 1345 TO 1728
GRD
Figure 1. PI227/228/229 Module Block Diagram
(See Table 1 for pin-out designation)
PAGE 2 OF 10 - PI227/228/229, 01-31-04
Mounted in the module housing, along with the PCB, is the second major component , it is
a one-to-one graded indexed micro lens array that focuses the scanned documents'
image onto the sensing line of the sensor chips. The third major component, mounted in
the module, is the LED light source. See Figure 2. The PI227/228/229's Cross Sectional
View. This pictorial cross section shows the LED Bar light source and its Illumination path
as it reflects the image from the document and focuses through the ROD lens on to its
image sensing line of the sensing chips. All components are housed in a small plastic
housing and covered with the fourth major component, a glass window. This cover glass
not only serves to protect all of the critical components within the housing from dust, but
also serves a minor role in the optical system. Together with rest of the module's optical
system, the module is adjusted to obtain the optimum depth-of-focus. See the paragraph
on MTF Graph and Its Discussions.
DOCUMENT SURFACE
GLASS WINDOW
ROD LENS
MODULE HOUSE
LIGHT PATH
D
LE
R
BA
SENSORS
PCB
INSIDE PICTORIAL OF MODULE
Figure 2. PI227/228/229's Cross Section
I/O Designation
I/O to the module is a 12-pin connector located on one end of the module. See Figure 5.
Module's Mechanical Overview. Table 1 lists the pin numbers and their designations for
the I/O connector. It is JAE IL-Z-12P-S125L3-E connector.
Pin Number
1
2
3
4
5
6
Symbol
VOUT1
VOUT2
GND
VOUT3
VOUT4
Vdd
Names and Functions
Analog Video Output 1
Analog Video Output 2
Ground; 0V
Analog Video Output 3
Analog Video Output 4
Positive power supply
PAGE 3 OF 10 - PI227/228/229, 01-31-04
7
8
9
10
11
12
SP(START)
GND
CP(CLOCK)
Vn
GLED
VLED
Shift register start pulse
Ground; 0V
Sampling clock pulse
Negative power supply
Ground for the light source; 0V
Supply for the light source
Table 1. Pin configuration
Module Versus LED Light Source
Table 2 lists the module's model and its corresponding LED Light Source.
Module
PI227MC-A4
PI228MC-A4
PI229MC-A4
LED Light Source
660 nm RED LED Bar
High power Yellow-Green LED Bar
Low power Yellow-Green LED Bar
Table 2. Module Vs LED Light Source
Absolute Maximum Rating:
Table 3A shows the absolute maximum ratings. The parameters are common to all three
modules. Table 3B shows the absolute maximum ratings that are different among the
three modules.
Parameter
Power Supply
Input clock pulse
(high level)
Input clock pulse
(low level)
Symbols
Vdd
Idd
Vn
In
Vih
Maximum Rating
7
100
-15
35
Vdd – 0.5V
Units
V
ma
V
ma
V
Vil
-0.5
V
Note: These parameters are absolute maximums do not operate under these conditions.
Table 3A. Electrical Absolute Maximum Rating
Parameter
Symbols
Power Supply:
Module
LED light source VLED
ILED
Maximum Rating
PI227MC-A4 PI228MC-A4
6.0
6.0
0.7
1.30
Units
PI229MC-A4
6.0
1.30
V
A
Note: These parameters are absolute maximums do not operate under these conditions .
Table 3B. LED Power Absolute Maximum Rating
PAGE 4 OF 10 - PI227/228/229, 01-31-04
Environmental Specifications
Operating
temperature(1)
Operating
humidity(1)
Storage
temperature(1)
Storage humidity(1)
Top
0 to 50
0
Hop
10 to 90
%
Tstg
-20 to+75
0
Hstg
10 to 90
%
C
C
Table 4. Operating and Storage Environment
Note (1) These are standard specifications for the CIS modules.
Electro-Optical Characteristics (25 °C)
Table 5A is the electro-optical characteristics common all three modules. Table 5B, 5C
and 5D show the different characteristics for each of the three LED light source.
Parameter
Total number of photo
detectors
Section 1, 2, & 3 number
of photo detectors
Section 4 number of
detectors
Pixel-to-pixel spacing
Symbol
Value
1728
Units
Elements
448
Elements
384
Elements
125
µm
Notes
Table 5A. Common Electro-Optical Characteristics
PI227MC-A4
Symbol
Parameter
660 RED LED
Value
Units
90
µsec
Fclk
Video Output
Up
5.0
1.0
<+/-30
MHz
Volt
%
Ud
Dark Level (DL)
MTF
<40
<60
>40
mV
mV
%
Line scanning rate
Tint
Clock frequency(2)
Bright output voltage(3)
Bright output
nonuniformity(4)
Dark nonuniformity(5)
Dark output voltage(6)
Modulation transfer
function(7)
(1)
Note
@ 5.0 MHz
clock
frequency
Table 5B. PI227MC-A4 Electro-Optical Characteristics
See notes below Table 5D.
PAGE 5 OF 10 - PI227/228/229, 01-31-04
PI228MC-A4
Symbol
Parameter
High Power Yellow-Green LED
Value
Units
Line scanning rate
Tint(1)
90
µsec
Clock frequency(2)
Bright output voltage(3)
Bright output
nonuniformity(4)
Dark nonuniformity(5)
Dark output voltage(6)
Modulation transfer
function(7)
Fclk
Video Output
Up
5.0
0.5
<+/-30
MHz
Volt
%
Ud
Dark Level (DL)
MTF
<40
<60
>40
mV
mV
%
Note
@ 5.0
MHz clock
frequency
Table 5C. PI228MC-A4 Electro-Optical Characteristics
See notes below Table 5D.
PI229MC-A4
Symbol
Parameter
Low Power Yellow-Green LED
Symbol
Units
Line scanning rate
Tint(1)
150
µsec
Clock frequency(2)
Bright output voltage(3)
Bright output
nonuniformity(4)
Dark nonuniformity(5)
Dark output voltage(6)
Modulation transfer
function(7)
Fclk
Video Output
Up
3.0
0.5
<+/-30
MHz
Volt
%
Ud
Dark Level (DL)
MTF
<40
<60
>40
mV
mV
%
Notes
@ 3.0
MHz clock
frequency
Table 5D. PI229MC-A4 Electro-Optical Characteristics
Definition:
(1) Tint is the line scanning rate or integration time. Tint is determined by the interval between two
start pulses, SP.
(2) Fclk: main clock frequency also equals the video sampling frequency.
(3) Video output level is controlled with a voltage adjustment as well as the Integration time and
LED light power.
(4) Up = [Vp(max) - Vpavg]/Vpavgx100% or [Vpavg-Vp(min)]/Vpavg}x100%, whichever is greater
is selected.
Where Vp(max) = maximum pixel level and Vp(min) = minimum pixel level.
∑
n5184
and Vpavg =
Vp(n) / 5184
n=1
(5) Ud = Vdmax – Vdmin
Vdmin is the minimum output voltage with LED off.
Vdmax is maximum output voltage with LED on.
(6) This level is measured from the reset level that is located between the pixels, during the pixel
reset duration. The reset level is at or near ground, 0V. Note the gain is adjustable on each
output. However, it is recommended that the gain should not be increased above the level
where the reset ground level starts to increase above zero.
(7) A graph of the typical MTF vs DOF is shown under discussion of MTF in Figure 5.
PAGE 6 OF 10 - PI227/228/229, 01-31-04
MTF Graph and Its Discussion
MTF IN %
TYPICAL MTF VS DEPTH OF FOCUS
60
50
40
30
20
10
0
0
0.2
0.4
0.6
DEPTH FROM THE WINDOW SURFACE(mm)
Figure 3. Typical MTF versus Distance
See Figure 3, Typical MTF versus Distance. This graph essentially shows the working
depth-of-focus. Two curves indicates the spread among the modules. Note that MTF is
greater than 40% out to distance greater than 0.4 mm from the glass surface. Since this
module is a 200DPI module, a pixel density of 200 pixel per inch, the MTF was measured
with a 100 DPI or a 50 line-pair per inch optical bar pattern. The test was conducted with
pixel rate set to 2.5MHz.
The effective algorithm used in the measurements is as described by the following
equation:
MTF={[Vp(n)+Vp(n+1)]/2-[Vp(n+2)+Vp(n+3)]/2}/{[Vp(n)+Vp(n+1)]/2+[Vp(n+2)+Vp(n+3)]/2}
Where n is 1, 2, .....1728th, Vp(n) is the signal amplitude of the nth pixel.
Operating Conditions (25 °C)
Item
Power Supply
Symbol
Vdd (positive)
Vn (negative)
Idd (positive)
In (negative)(1)
Input voltage at digital high Vih
Input voltage at digital low Vil
Clock frequency
Fclk
Min
4.5
-10
60
20
Vdd-1.0
0
0.2 (2)
Typical
5.0
-5
66
20
Vdd-.5
PAGE 7 OF 10 - PI227/228/229, 01-31-04
Max
5.5
-4.0
75
20
Vdd
0.6
5.5(3)
Units
V
V
ma
ma
V
V
MHz
Clock pulse high duty
cycle
Clock pulse high duration
Integration time
Operating temperature(4)
PI227MC-A4
Parameter
VLED
ILED
45.5
82
Tint
Top
Minimum
25
%
50
150
25
ns
µs
o
C
50
Typical
5.0
480
Maximum
5.5
550
Volts
ma
Typical
5.0
650
Maximum
5.5
950
Volts
ma
Typical
5.0
650
Maximum
5.5
950
Volts
ma
PI228MC-A4
Minimum
VLED
ILED
PI229MC-A4
Minimum
VLED
ILED
Table 6. Recommended Operating Condition (25 o C )
Note (1) current is essential constant current with supply voltage.
Note (2) determined by the longest tolerable integration time. Because of leakage current build
up, the integration time is recommended to be no greater than 10 ms.
Note (3) the maximum call out is for the modules' electrical speed. Light Source still dictates the
highest speed performance.
Note (4) this specification is a standard used by the CIS makers for the Fax Industry.
Switching Characteristics (25°C)
The Switching Characteristics (25°C) for the I/O clocks are shown in the diagram of Figure
4, on the following page. Each switch timing characteristic for each waveform is
represented by their symbolic acronym. Each corresponding switching time is defined in
the Table 7, located below Figure 4. Note: Only one video output is shown because all
four videos have identical electrical characteristic. The only physical difference is in
section 4 output, VOUT4. Section 4 has only 6 sensor chips, hence, its active scan is
shorter by 64 pixels.
(See Figure 4 on the following page)
PAGE 8 of 10 - PI227/228/229, 01-31-04
to
tw
CP
tprh
tdh
SP
tdl
tds
Vout
tsh
MODULE TIMING DIAGRAM
Figure 4
Item
Clock cycle time
Clock pulse width
Clock duty cycle
Prohibit crossing time
of Start Pulse(1)
Data setup time
Data hold time
Signal delay time
Signal settling time
Symbol
to
tw
tprh
Min.
0.20
50
25
0
tds
tdh
tdl
tsh
20
0
20
100
Typical
Max.
4.0
75
Units
µs
ns
%
ns
ns
ns
ns
ns
Table 7. Timing Symbol’s Definition and Timing Values.
Note1:
"Prohibit crossing of start pulse" is to indicate that the start pulse should not be active high
between any two consecutive clock pulse, specifically, between two consecutive low going clock
pulses. See the timing diagram. All falling clock edges under a active high start pulse loads the
internal shift register, therefore the start pulse must be active over only one falling clock edge.
High start pulse over all rising clock edge is ignored by the shift register. One simple way to
ensure that the start pulse will not be actively high during two consecutive falling clock edge is to
generate the start pulse on a rising clock edge and terminate it on the following rising clock edge.
PAGE 9 OF 10 - PI227/228/229, 01-31-04
Mechanical Structure of the Module
The isometric sketch, Figure 5, of the housing shows the connector location, the
approximate overall dimensions and its general geometric layout of the module. It is not
intended for use as a design reference. The detailed drawing for the any of the
PI227/228/229 Module Mechanical Overview is available upon request.
23
PIN
AN N
SC CTIO
E
R
DI
2
1
END VIEW
co
e
nn
cto
r
21.5mm
22.0mm
THE SURFACE
OF THE GLASS
Figure 5. PI227/228/229 Module Mechanical Overview
©2001- 04 Peripheral Imaging Corporation. Printed in USA. All rights reserved. Specifications
are subject to change without notice. Contents may not be reproduced in whole or in part without
the express prior written permission of Peripheral Imaging Corporation. Information furnished
herein is believed to be accurate and reliable. However, no responsibility is assumed by Peripheral
Imaging Corporation for its use nor for any infringement of patents or other rights granted by
implication or otherwise under any patent or patent rights of Peripheral Imaging Corporation.
PAGE 10 OF 10 - PI227/228/229, 01-31-04