AMIS-710214中文资料

1.0 General Description

The AMIS-710214 (PI214MC-DR) is a contact image sensor (CIS) module with an additional on-board circuit that digitizes the analog pixels from the CIS image sensor to a “background-tracking”, two-level digital output signal. It is based on AMI Semiconductor’s CIS module that employs MOS image sensor technology to gain its high-speed performance and high sensitivity. The AMIS-710214 is suitable for scanning documents with width of 216mm and with resolution of 8 dots per millimeter (dpm). It has broad applications, but is specially designed for the following areas:

? Where data compression is required, such as in data transmissions.

? Where component pin-out count must be kept to a minimum.

The background-tracking-digitizing circuits in the AMIS-710214 have been referred to as the “dynamic threshold” two-level A/D converter. For the purpose of describing the module’s characteristics this “dynamic threshold” processing circuit shall herein be referred to as the “tracking digitizer”.

2.0 Key Features

? Light source, lens and sensor are integrated into a single module

? 8dpm resolution, 216mm scanning length

? Up to 440μsec/line scanning speed, with 4.0MHz pixel rate (See Table 3, Note 2)

? Wide dynamic range

? Two-level tracking digital output (“Dynamic Threshold Digitizer”)

? Red (660nm) light source (other colors are available)

? Compact size ? 19.5mm x 21.5mm x 232mm

? Low power

? Light weight

3.0 Module Description

The AMIS-710214 module consists of 27 sensors 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 a one-to-one graded-indexed micro lens array that focuses the scanned documents to image onto its sensing plane. A buffer amplifier amplifies the video pixels from the image sensors and passes them to analog digitizing circuit, where video pixels are converted to digital signal and passed to output of the module. See Figure 1.

Illumination is accomplished 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. The pictorial of AMIS-710214 cross section is shown in Figure 2.

I/O to the module is a 2 x 2mm 16-pin unshrouded connector (see I/O pin assignment, under Specifications) located on one end of the module (see module drawing).

4.0 Circuit Description and Operation

See Figure 3, which is a simplified block diagram of the analog tracking digitizer. Fundamentally, the tracking digitizer transforms the ignal output from a CIS module s existing on the market today. It takes the analog signal from the CIS section of AMIS-710214 and derives a tracking background reference signal. Then this reference is compared against the output signals from the CIS section. The resulting signal from comparison produces a two-level igure 1, AMIS-710214 block diagram depicts the two basic circuits, the CIS (image sensors and video amplifier) and the tracking digitizer. In the CIS section, the module has 27 serially concatenated PI3004B image sensors, accordingly, the image sensors will span one scanning-read line width that is 27 sensor times 64 pixel elements/sensor, or 1728 pixel elements.

In operation, the module produces the analog image pixel signals that are proportional to exposure on the corresponding picture element on the document (the video signal) then passes the signal to the tracking digitizer. In turn, the digitizer processes the analog image pixels to digital image pixels. The analog image pixels, at test point TV, are separated into two signals. One generates the reference signal and the other remains unmodified. These unmodified image pixels are applied to one of the input of the comparator. The reference signal is applied to the second input of the comparator. The results of the comparison are the digital image pixels. This digital output is produced in two levels, determined by the difference between the background reference signal and the analog image pixels. A digital pixel output of value “one” represents the analog image pixel that is brighter than the background and digital pixel level of value “zero” represents the image pixel that is darker than background.

digital signal that is high when the pixel signal is brighter than the background and remains at zero as long as the signal is darker than the background signal.

F

5.0 Specifications

The I/O Connector is a Molex connector, part number 87049-1616, and its pin numbers and their functions are listed in Table 1.

Table 1: Pin Configuration

Pin Number Symbol Names and Functions 1 ,2, 4, & 8

GRD Ground; 0V

3 DIGOUT Digital video output 5 & 6 VDD Positive power supply

7 SP Start Pulse for the shift register 9 & 10 Vn Negative power supply 11 & 12 Clock (CP) Clock for the shift register

13 & 14 GLED Return for the LED light source 15 & 16

VLED

Power in for the LED light source

5.1 Inputs

here are five inputs:

Clock (CP): This is the input for the main sampling clock. SP: This is the start pulse input for initiating the scan. VDD: This is an input for the + 5V positive supply. VN: This is the input for the -5V negative supply.

VLED: This is the input for the +5V power supply for the LED light source.

ote: Power return for the LED light source is GLED on Pin 13 &14, where as the rest of ground returns are on Pins 1, 2, 4, & 8.

DIGOUT on Pin 3 of the I/O connector is the only output I/O. Pin 3 is the digital video output from the CIS module. Reflection off the dark target produces a digital signal of “0” level, while the white reflection off the white target produces a digital level of “one”. The 6.0 ptical Char stics at T ?????N 5.2 Video Output

amplitudes of the white and dark are listed in the table below:

E O lectro-a ri cte 25C

°Table 2: ptical Characteristics at 2Electro-O 5 °C Parameter

Symbol

Parameter Units Note Number etectors Elements of photo d 1728 Pixel-to-pixel spacing 125 μm

Line sca Tint (1)μsec @ 4.0MHz clock

frequency

nning rate 440 Clock frequency

f

4.0 MHz Bright output Dark output

Digital video output signal

>3.2 <0.8

V V

Note:

1.

The tint is specified with a 4.0MHz clock frequency. In operation generator’s time constant will determine the optimum integration the time constants in the reference generator are set to match the initial exposure time, hence the time. Note, the integration time is also a function of the clock frequency. Accordingly it is highly pecific applications.

recommended that the parameters be factory adjust for the s

Table 3: Recommended Operating Conditions (25°C) Item Symbol Min. Mean Max. Units Vdd 5.0 V

Vn. -5.0 V

VLED Power supply 5.0

V Idd 350 mA Ivn 20 mA ILED 390 450 mA

Input voltage at digital high Vih Vdd-1.0 Vdd-0.5 Vdd V Input voltage at digital low Vil 0 0.8 V Clock frequency f 4.0 MHz Clock pulse high duty cycle 25 %

Clock pulse high duration Clock 62.5 (1)

ns

Integration time Tint 0.440 ms

(2)

Operating temperature Top 25 50 °

C

Notes:

1. Clock pulse high is specified at 4.0MHz at 25 percent duty.

is specified with a 4.0MHz clock frequency. In operation the time constan the reference generator are set to match posure time, hence the stant of the reference generat ntegration gly it is hi commended that the s be factory adjust e specific applications.

7.0 Sw 2. The tint con ts in the initial ex time for th or will determine the optimum i time. Accordin gh re ly parameter

itching Characteristics (25°C)

The switching characteristics for the I/O clocks are shown in Figure 4. The timing parametric values and their symbols are given in Table 4.

Table 4: Switching Parameters and Timing Symbol Definitions

Parameter Symbol Min. Typ. Max. Units

250

Clock cycle time to ns

Clock pulse width tw 62.5 ns

Clock duty cycle 25 50 %

Prohibit crossing time of SP tprh 15 ns

Data setup time tds 20 ns

Data hold time tdh 20 ns

Signal delay time tdl 50 ns

Signal settling time tsh 120 ns

Digital signal delay tddl 50 ns

Digital signal off delay tdodl 20 ns

8.0 Absolute Maximum Rating

Table 5: Absolute Maximum Rating

Parameter Symbols Maximum Rating Units

Power supply voltage

Vdd 10 V

Idd 375

mA

Vn -10 V

Ivn 30

mA

VLED 5.5 V

mA

ILED 450

Input clock pulse (high level) Vih Vdd – 0.5 V

Input clock pulse (low level) Vil -0.8 V

Table 6: Operating Environment

Parameter Symbols Maximum Rating Units

Operating temperature Top 0 to 50 °C

Operating humidity Hop 10 to 85 %

Storage temperature Tstg -25 to +75 °C

Storage humidity Hstg 5 to 95 %

9.0 Mechanical Structure

10.0 Company or Product Inquiries

For more information about AMI Semiconductor, our technology and our product, visit our Web site at: https://www.sodocs.net/doc/5115664239.html, North America

Tel: +1.208.233.4690

Fax: +1.208.234.6795

Europe

Tel: +32 (0) 55.33.22.11

Fax: +32 (0) 55.31.81.12

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