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| Ordering number : EN*5735 CMOS LSI LC821031 Image-Processing IC for Facsimile, Copier, and OCR Products Preliminaly Overview The LC821031 converts analog video signals from CCD and contact sensors to high-quality binary image data. It includes both an 8-bit A/D converter and a 6-bit D/A converter for setting the reference potential and creates high-quality multi-valued data using a gamma conversion technique that supports arbitrary gamma curves. It also provides both black and white all-pixel distortion correction and multi-valued resolution conversion. It then applies two-dimensional filtering to this multi-valued data to separate the document image into text, photograph, and halftone areas. After converting the image to a binary image using an error diffusion technique that acquires high-quality images, it applies reduction in both the primary and secondary scan directions. Since the LC821031 limits the number of pixels processed per line to 3072 pixels, it needs no external memory to implement this processing. Thus the LC821031 implements the image processing used by facsimile, copier, and OCR products. * Gamma correction (Supports user-defined curves: 8-bit data) * Image area separation * Simple binary coding (fixed threshold and density adaptive threshold) * Halftone processing: error diffusion method (64 levels) * Multi-value resolution conversion (Conversion ratios of 1:2, 2:3, 3:2, and 2:1) * Binary image reduction (Main scan line direction: decimation, fine black line retention, fine white line retention; secondary scan line direction: decimation, fine line retention) * Fabricated in a CMOS process for single 5-V powersupply and low power. Package Dimensions unit: mm 3159-QFP64E [LC821031] Features * Number of pixels processed: 3072 pixels/line * Processing speed: 250 ns/pixel, maximum (When CLKIN = 32 MHz) * 8-bit A/D converter (Includes a sensor signal timing adjustment function.) * 6-bit D/A converter for setting the A/D converter reference potential * Sensor drive circuit (Supports most CCD and CIS devices.) * Digital clamp (single-point clamping and even/odd clamping) * Distortion correction (white correction: all-pixel correction, black correction: all-pixel correction) SANYO: QIP64E Specifications Absolute Maximum Ratings at Ta = 25C, GND = 0 V Parameter Maximum supply voltage Input and output voltage Allowable power dissipation Operating temperature Storage temperature Soldering conditions Symbol VDD max VI, VO Pd max Topr Tstg Hand soldering: 3 seconds Reflow soldering: 10 seconds Ta 70C Conditions Ratings -0.3 to +7.0 -0.3 to VDD+0.3 350 -30 to +70 -55 to +125 350 235 Unit V V mW C C C C SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN 22898HA (OT) No. 5735-1/5 LC821031 Allowable Operating Ranges at Ta = -30 to +70C, GND = 0 V Parameter Supply voltage Input voltage Symbol VDD VIN Conditions Ratings min 4.5 0 typ max 5.5 VDD Unit V V DC Characteristics at Ta = -30 to +70C, GND = 0 V, VDD = 4.5 to 5.5 V Parameter Input high-level voltage Input low-level voltage Input leakage current Output high-level voltage Output low-level voltage Output leakage current Current drain Symbol VIH VIL IIH, L VOH VOL IL IDD VIN = VDD, VSS IOH = -3 mA IOL = 3 mA When high-impedance CLKIN = 32 MHz -10 40 -10 2.4 0.4 +10 70 Conditions Ratings min 2.2 0.8 +10 typ max Unit V V A V V A mA Analog Characteristics Parameter [D/A Converter] Resolution Internal resistance [A/D Converter] ATAPL potential: 0.8 V, ATAPH potential: 4.2 V Resolution Linearity error Differential linearity error Internal resistance 330 8 1 1 bit LSB LSB 6 4.8 bit k Symbol Conditions Ratings min typ max Unit Block Diagram Registers Controller Sensor motor drive Analog block Filters Binary correction Output control Distortion correction Image area separation Halftone Binary image reduction Multi-valued resolution conversion Gamma correction 2-kilobit SRAM No. 5735-2/5 LC821031 Pin Functions I: Input pin, O: Output pin, B: Bidirectional pin, P: Power supply pin, NC: Not Connected Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Symbol D7 D6 D5 D4 D3 D2 D1 D0 DGND DVDD A8 A7 A6 A5 A4 A3 DGND A2 A1 A0 WR RD A12 DVDD CLKIN A11 A10 A9 CS ICLK TRIG RESET SAMP/LININT TEST REF AGND DALRL DAHRL I/O B B B B B B B B P P I I I I I I P I I I I I I P I I I I I I I I O I I P I I CPU interface chip select signal External sampling point signal input External trigger signal input System reset A/D converter sampling point monitor signal output/LINE signal output Test pin (Must be tied to the digital system ground in normal operation.) DRAM refresh signal input Analog system ground Low reference for the D/A converter used for the A/D converter low reference. Low reference for the D/A converter used for the A/D converter high reference. CPU interface address bus CPU interface write signal CPU interface read signal CPU interface address bus Digital system power supply System clock input CPU interface address bus Digital system ground CPU interface address bus A12 is the MSB, and A0 is the LSB. Digital system ground Digital system power supply CPU interface data bus D7 is the MSB, and D0 is the LSB. Function Continued on next page. No. 5735-3/5 LC821031 Continued from preceding page. I: Input pin, O: Output pin, B: Bidirectional pin, P: Power supply pin, NC: Not Connected Pin No. 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 Symbol AIN TEMP ATAPH DAHRH AVDD DALRH ATAPL AGND PD7/SD PD6/SDCK DGND PD5/SDE PD4/PP4 PD3/PP3 PD2/PP2 PD1/PP1 PD0/PP0 DVDD DACK/PP5 DREQ/PP6 MTP/PP7 CLK2 CLK1 RS SH DGND I/O I I O I P I O P O O P O B B B B B P B B B O O O O P Digital system ground Sensor drive signal outputs Digital system power supply DMA data acknowledge signal input pin/general-purpose I/O port DMA data request signal output/general-purpose I/O port Motor drive timing signal output/general-purpose I/O port DMA output/general-purpose I/O ports Sensor signal input Temperature signal input Analog middle level for the A/D converter high reference High reference for the D/A converter used for the A/D converter high reference. Analog system power supply High reference for the D/A converter used for the A/D converter low reference. Analog middle level for the A/D converter low reference Analog system ground DMA output/serial data output DMA output/serial data transfer clock Digital system ground DMA output/serial data output valid period signal Function Note: Unused input pins must not be left open. These pins must be connected either to the digital system power supply or to the digital system ground. No. 5735-4/5 LC821031 Sample Application Circuit A12 to A0 D7 to D0 PD7 to PD0 * Use a 0.01 F monolithic capacitor for C1. * Applications must set up the polarity of the image signal from the sensor so that white data is at the highest potential and black data is at the lowest. If the peak level in the image signal from the sensor does not reach 4.2 V, a level conversion circuit should be added to allow the application to take advantage of the dynamic range of the internal D/A converter. * Although AGND and DGND are fully isolated from each other within the IC, AVDD and DVDD are connected through the substrate. Therefore applications must be designed so that there is no potential difference between AVDD and DVDD. Also, the rise and fall of these power-supply potentials must occur within 3 ms of each other. s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. s Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of February, 1998. Specifications and information herein are subject to change without notice. PS No. 5735-5/5 |
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