REVISION NUMBER : REV 1
PAGES : 1 of 13
DATE : 2-23-04
PI627MC-A4 / PI628MC-A4 / PI629MC-A4
Contact Image Sensor Modules
Engineering Data Sheet
A Family of 600DPI CIS Modules,
each with a specific LED light source
PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Key Features
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LED Light source, lens, and sensor are integrated into a single module
Ultra-high-speed
Four parallel analog video outputs, clocked as high as 5.5MHz
270 µsec/line scanning speed @ 5.0MHz clock rate for the red light source
23.62 dots/mm resolution, 216 mm scanning length
Wide dynamic range
Standard A4 size ≅ 14.5mm x 19.5 mm x 232 mm
Low power
Light weight
General Description
The PI627MC-A4, PI628MC-A4 and PI629MC-A4 are a family of Contact Image Sensor (CIS) modules,
using MOS image sensor technology for high-speed performance and high sensitivity. They contain a
complete optical imaging system that includes the light source and focusing elements.
The modules’ contact image sensor is divided into four sections, each with its own video output and identical
processing circuits allowing for high scanning speeds. Each module comes with its own particular LED light
source, which have different maximum light power outputs. Since the light power limits the exposure, which
is proportional to the product of scanning speed and light power, each module will have a different maximum
scanning speed and signal output voltage.
The modules can be used for scanning A4 size (216 mm) documents with 23.62 dots per millimeter
resolution. Applications include document scanning, mark readers, gaming and office automation
equipment.
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PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Functional Description
Each of the 3 modules consists of 27 PI3039 image sensors cascaded together. Each sensor consists of
192 photo-sensing elements (pixels), resulting in a module 5184 pixels long.
These image sensors have associated multiplex switches that are sequentially accessed with its digital shift
register. In addition, each has a chip-select switch that functions to activate its preceding sensor on the
cascaded sequence, after its predecessor chip has completed its scan. The start pulse initiates the shift
register of the first chip in all four sections. The first chip then sequentially clocks out the integrated image
charge from each pixel. These charges are passed through the sensors’ multiplexing switch and then out
onto the video line, where they are converted to a voltage. When the sensor completes its scan, the chipselect switch on the following chip is switched on to continue the line scan until it completes its scan in one
section. A new scan is initiated when a start pulse is again entered into the first chip of each section.
The 27 sensors are cascaded together and bonded onto a PCB. The cascaded sensors are then divided
into 4 subsections, each subsection having its own output. The first 3 subsections contain 7 sensors and the
4th contains 6 sensors. Each output is then connected to its own video line. The four video lines form a video
line capacitance, which are buffered by video amplifiers, to act as output drivers. The charge from each
output is integrated onto the video line capacitance and readout. Each pixel is then reset and ready to
integrate again.
Mounted in the module is a one-to-one graded indexed micro lens array that focuses the scanned
documents to be imaged onto its sensing plane.
Illumination is by means of an integrated LED light source. The particular Led for each module is listed in
Table 1
Module
PI627MC-A4
PI628MC-A4
PI629MC-A4
LED Type
660nm Red LED Bar
High power Yellow-Green LED Bar
Low power Yellow-Green LED Bar
Table 1. Module vs LED Light Source
All components are housed in a small plastic housing which has a glass cover that acts as the focal point for
the object being scanned and protects the imaging array, micro lens assembly, and LED light source from
dust.
Figures 1 and 2 on page 4 show a block diagram and a cross section of a module.
Page 3 of 13, Revised 2-23-04
PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Figure 1. Module Block Diagram
Figure 2. Module Cross Section
Page 4 of 13, Revised 2-23-04
PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Connector Pin-Out
Inputs and outputs to the module are via a 12-pin connector, part number JAE IL-Z-12P-S125L3-E, located
on one end of the module.
Table 2 lists the connector pin-out with their symbols and descriptions.
Connector
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
Symbol
Description
VOUT1
VOUT2
GND
VOUT3
VOUT4
Vdd
SP(START)
GND
CP(CLOCK)
Vn
GLED
VLED
Analog video output 1
Analog video output 2
Ground
Analog video output 3
Analog video output 4
Power supply
Shift register start pulse
Ground
Clock pulse
Negative power supply
Ground for the light source
Power supply for the light source
Table 2. Pin-out configuration
Page 5 of 13, Revised 2-23-04
PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Absolute Maximum Rating
Table 3 shows the absolute maximum ratings for the parameters common to all three modules. As each
module has its own particular LED source, table 4 shows the absolute maximum ratings particular to each of
the 3 LED light sources. These are the absolute maximum ratings and continuous operation is not
recommended.
Parameter
Power Supply
Symbol
Vdd
Idd
Vn
In
Vih
Vil
Input clock pulse (high level)
Input clock pulse (low level)
Max Rating
7
100
-15
20
Vdd - 0.5V
-0.5
Units
V
mA
V
mA
V
V
Table 3. Absolute Maximum Ratings Common to all 3 Modules
Parameter
VLED
ILED
PI627MC-A4 /
660nm Red LED
5.5
0.7
Max Rating
PI628MC-A4 /
High Power
Yellow-Green LED
5.5
1.0
PI629MC-A4 /
Low Power
Yellow-Green LED
5.5
1.0
Table 4. LED Absolute Maximum Ratings
Environmental Specifications
Table 5 lists the environmental conditions for the modules.
Parameter
Operating temperature
Operating humidity
Storage temperature
Storage humidity
Max Rating
0 to 50
10 to 90
-20 to+75
10 to 90
Units
0
C
%
0
C
%
Table 5. Operating and Storage Environment
Page 6 of 13, Revised 8/31/05
Units
V
A
PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Electro-Optical Characteristics at 25°C
Table 6 lists the electro-optical characteristics common to all three modules. Tables 7, 8 and 9 show the
characteristics particular to each of the 3 LED light sources.
Parameter
Total Number of Pixels in each module
Number of pixels in Sections 1, 2 & 3
Number of pixels in Section 4
Pixel-to-pixel spacing
Value
5184
1344
1152
42.3
Units
Elements
Elements
Elements
µm
Table 6. Electro-Optical Characteristics Common to all 3 Modules
Module: PI627MC-A4
Light source: 660nm RED LED
Parameter
Line scanning rate (1)
Clock frequency(2)
Bright output voltage(3)(7)
Bright output nonuniformity(4)
Adjacent photo-response nonuniformity(5)
Dark nonuniformity(6)
Dark output voltage(7)
Modulation transfer function(8)
Symbol
Tint
Value
270
Units
µsec
Fclk
Video Output
Up
Upn
5.0
1.0
< +/-30
<25
MHz
Volt
%
%
Ud
Dark Level (DL)
MTF
< 100
< 450
> 40
mV
mV
%
Note
@ 5.0MHz
clock frequency
Table 7. PI627MC-A4 / 660nm Red LED Electro-Optical Characteristics
Module: PI628MC-A4
Light source: High Power Yellow-Green LED
Parameter
Line scanning rate (1)
Clock frequency(2)
Bright output voltage(3)(7)
Bright output nonuniformity(4)
Adjacent photo-response nonuniformity(5)
Dark nonuniformity(6)
Dark output voltage(7)
Modulation transfer function(8)
Symbol
Tint
Value
270
Units
µsec
Fclk
Video Output
Up
Upn
5.0
0.5
< +/-30
<25
MHz
Volt
%
%
Ud
Dark Level (DL)
MTF
< 100
< 450
> 40
mV
mV
%
Note
@ 5.0MHz
clock frequency
Table 8. PI628MC-A4 / High Power Yellow-Green LED Electro-Optical Characteristics
Page 7 of 13, Revised 9-8-05
PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Module: PI629MC-A4
Light source: Low Power Yellow-Green LED
Parameter
Line scanning rate(1)
Clock frequency(2)
Bright output voltage(3)(7)
Bright output nonuniformity(4)
Adjacent photo-response nonuniformity(5)
Dark nonuniformity(6)
Dark output voltage(7)
Modulation transfer function(8)
Symbol
Tint
Value
450
Units
µsec
Fclk
Video Output
Up
Upn
3.0
0.5
< +/-30
<25
MHz
Volt
%
%
Ud
Dark Level (DL)
MTF
< 100
< 350
> 40
mV
mV
%
Notes
@ 3.0MHz
clock frequency
Table 9. PI629MC-A4 / Low Power Yellow-Green LED Electro-Optical Characteristics
Notes:
1. Tint is the line-scanning rate or integration time and is determined by the interval between two start
pulses, SP. The integration time listed for each module is the minimum integration time required to
give 0.5 volts output at each modules maximum clock frequency.
2. Fclk is the main clock frequency, also equals the pixel rate.
3. Video output level is dependent on the Integration time and LED light power.
4. Up = [Vp(max) - Vpavg] / Vpavg x 100% or [Vpavg - Vp(min)] / Vpavg} x 100%, whichever is
greater. Where Vp(max) = maximum pixel level, Vp(min) = minimum pixel level, and Vpavg =
average of all pixels.
5. Adjacent Photo-Response Non-Uniformity (Upn).
Upn = Max ((Vpn – Vpn+1) / Min (Vpn, Vpn+1)) x 100%, where Vpn is the pixel output voltage of
pixel n in the light.
6. Ud = Vdmax - Vdmin, where Vdmin is the minimum output voltage with LED off and Vdmax is
maximum output voltage with LED on.
7. See paragraph under Reset Level and Video Sampling Time on page 10 for explanation.
8. See the paragraph under Depth of Focus on page 11. A graph of the typical MTF vs Depth of Focus
is shown.
Page 8 of 13, Revised 9-08-05
PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Recommended Operating Conditions at 25 °C
Table 10 lists the recommended operating conditions common to all three modules. Table 11 lists the
recommended operating conditions particular to each of the three LED light sources.
Parameter
Power Supply
Input voltage (high level)
Input voltage (low level)
Clock frequency (1)
Clock pulse high duty cycle
Clock pulse high duration
Integration time(1)
Operating temperature
Symbol
Vdd (positive)
Vn (negative)
Idd (positive)
In (negative)
Vih
Vil
Fclk
Duty
Pwck
Tint
Top
Min
4.5
-10
60
19
Vdd - 1.0
0
0.518
25
46
82
Typical
5.0
-5
66
20
Vdd -0.5
50
Max
5.5
-4.0
75
21
Vdd
0.6
5.5
75
150
25
50
Units
V
V
mA
mA
V
V
MHz
%
ns
µs
o
C
Table 10. Recommended Operating Conditions at 25 °C, common to all 3 modules
LED Light Source
660nm Red LED
Parameter
VLED
ILED
Min
Typical
5.0
480
Max
5.5
550
Units
Volts
mA
High Power Yellow-Green LED
VLED
ILED
5.0
TBD
5.5
TBD
Volts
mA
Low Power Yellow-Green LED
VLED
ILED
5.0
TBD
5.5
TBD
Volts
mA
Table 11. Recommended Operating Conditions at 25 °C, for each LED
Note
1. The maximum clock speed is limited by the modules light source power, due to the low light power
associated with LED’s.
The minimum clock speed is determined by the longest tolerable integration time. Because of the
leakage current build up, the integration time is recommended to be no greater than 10 ms.
Page 9 of 13, Revised 2-23-04
PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Reset Level and Video Sampling Time
Figure 3. Reset Level and Sample Time
Figure 3 shows the video signal waveform and details a single pixel. The signal output waveform is shown
referenced to the input clock waveform. Also shown is the terminology used to define the dark and bright
output levels and the recommended pixels sampling times.
The dark level is defined by using the module imaging on a black target or with the light source turned off.
The dark level is then measured from ground or 0 volts. The reset level is a reference level of the reset
switch, which is not necessarily at ground. The reason for this is that after the reset operation, the video
signal is passed through an amplifier, which may have some offsets. The difference between the dark level
and reset level is called the pedestal, PED. Hence, the reset level will sit below the dark level.
The video pixels, demonstrated in this graph, are ideal waveforms from a CIS module using a
phototransistor imaging structure. The video output at high speeds, such as 5.0 MHz, does not instantly rise
to its final value, although, if it is given enough time it would eventually approach its steady state value (in
order of milliseconds). However, at high speeds it is impractical to wait until a final stable value is reached.
The suggested sampling point is therefore a few nanoseconds prior to the signal falling edge.
Page 10 of 13, Revised 2-23-04
PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Depth of Focus
Figure 4 shows the typical MTF versus Distance, which can be used to define the working depth of focus.
Two curves indicate the spread among the modules. Note that the MTF is greater than 40% out to a
distance greater than 0.3 mm from the glass surface. Since this module is a 600DPI module, a pixel density
of 600 pixels per inch, the MTF was measured with a 300 DPI or a 150 line-pair per inch optical bar pattern.
The test was conducted with pixel rate set to 5.0MHz.
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, .....5184th, Vp(n) is the signal amplitude of the nth pixel.
TYPICAL MTF VS DEPTH OF FOCUS
MTF IN %
60
50
40
30
20
10
0
0
0.2
0.4
0.6
DEPTH FROM THE WINDOW SURFACE(mm)
Figure 4. Typical MTF versus Distance
Page 11 of 13, Revised 2-23-04
PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Engineering Data Sheet
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Timing Characteristics at 25°C
The Timing Characteristics at 25°C for the I/O clocks are shown in Figure 5 and their definitions detailed in
Table 12. Only one video output is shown because all four video sections have identical electrical
characteristics. Since there is 7 die in sections 1, 2 and 3 and 6 die in section 4, the output waveform for
section 4 (Vout 4) is shorter by 192 pixels.
Figure 5. Module Timing Diagram
Item
Clock cycle time
Clock pulse width
Clock duty cycle
Prohibit crossing time of the
Start Pulse(1)
Data setup time
Data hold time
Signal delay time
Signal settling time
Symbol
to
tw
tprh
Min
0.182
46
25
50
tds
tdh
tdl
tsh
50
50
50
100
Typical
Max
1.93
1448
75
Units
µs
ns
%
ns
ns
ns
ns
ns
Table 12. Timing Definitions
Note
1. "Prohibit crossing of the start pulse", tprh, is to indicate that the start pulse should not be active high
between two consecutive low going clock pulses. All falling clock edges under an active high start pulse
loads the internal shift register, therefore the start pulse must be active over only one falling clock edge.
A high start pulse crossing over any rising clock edges are ignored by the shift register. One simple way
to ensure that the start pulse will not be actively high for any two consecutive falling clock edges is to
generate the start pulse on a rising clock edge and terminate it on the following rising clock edge.
Page 12 of 13, Revised 2-23-04
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Mechanical Structure of the Module
Figure 6 is an overview of the module housing showing the connector location, the module’s approximate
overall dimensions and its general layout. It is not intended for use as a design reference. A detailed
drawing for the any of the PI627MC-A4 / PI628MC-A4 / PI629MC-A4 Module Housings is available upon
request.
Figure 6. Module Mechanical Overview
2004 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
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infringement of patents or other rights granted by implication or otherwise under any patent or patent rights
of Peripheral Imaging Corporation
Page 13 of 13, Revised 2-23-04