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| TM 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 347sec/line scanning speed possible with optional light sources * YELLOW-GREEN LED light source, limits the typical line scan to 695 sec @ 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 m sec 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 sec typically set at the factory for YellowGreen 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 (25C) 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 s Page 5 of 6 - PI226M-A4, 2-22-02 Clock pulse width Clock duty cycle Prohibit crossing time of Start Pulse Data setup time Data hold time Signal delay time Signal settling time tw tprh tds tdh tdl tsh 82 25 15 20 20 50 120 75 ns % ns ns ns ns ns Table 6. Symbol Definitions for the Above Timing Diagram PI226M-A4 Module and Its Mechanical Dimensions PIN 1 23 82 .5 2 8 2.5 N AN IO SC ECT IR D END VIEW 19+/-0.3 18+/-0.3 14.6 SIDE TAPE 6.0 A RE D LI NE O 2.2+/-0.05 HOLE 2X2 - M2.6 TAPSIZE USE (DP6) 15.5+/-0.05 5.8 +/-0.3 THE SURFACE OF THE GLASS 1.25 MECHANICAL STRUCTURE Figure 4. Overall View of the Module House This is an overview drawing of the module. A full size drawing is available upon request. (c)2002 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 6 of 6 - PI226M-A4, 2-22-02 |
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