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 = 25°C, GND = 0 V Parameter Symbol Maximum supply voltage VDD max Input and output voltage VI, VO Allowable power dissipation Pd max Conditions Ta ≤ 70°C Ratings Unit –0.3 to +7.0 V –0.3 to VDD+0.3 V 350 mW Operating temperature Topr –30 to +70 Storage temperature Tstg –55 to +125 °C Hand soldering: 3 seconds 350 °C Reflow soldering: 10 seconds 235 °C Soldering conditions °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 +70°C, GND = 0 V Parameter Symbol Conditions Ratings min typ Unit max Supply voltage VDD 4.5 5.5 V Input voltage VIN 0 VDD V DC Characteristics at Ta = –30 to +70°C, GND = 0 V, VDD = 4.5 to 5.5 V Parameter Symbol Conditions Ratings min Input high-level voltage VIH Input low-level voltage VIL Input leakage current IIH, L VIN = VDD, VSS –10 2.4 Output high-level voltage VOH IOH = –3 mA VOL IOL = 3 mA Output leakage current IL IDD Unit max 2.2 Output low-level voltage Current drain typ When high-impedance V V +10 µA V –10 CLKIN = 32 MHz 0.8 40 0.4 V +10 µA 70 mA Analog Characteristics Parameter Symbol Conditions Ratings min typ Unit max [D/A Converter] Resolution Internal resistance 6 bit 4.8 kΩ [A/D Converter] ATAPL potential: 0.8 V, ATAPH potential: 4.2 V Resolution 8 Linearity error Differential linearity error Internal resistance 330 bit ±1 LSB ±1 LSB Ω Block Diagram Registers Sensor motor drive Controller 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. Symbol I/O 1 D7 B Function 2 D6 B 3 D5 B 4 D4 B CPU interface data bus 5 D3 B D7 is the MSB, and D0 is the LSB. 6 D2 B 7 D1 B 8 D0 B 9 DGND P Digital system ground 10 DVDD P Digital system power supply 11 A8 I 12 A7 I 13 A6 I CPU interface address bus 14 A5 I A12 is the MSB, and A0 is the LSB. 15 A4 I 16 A3 I 17 DGND P 18 A2 I 19 A1 I 20 A0 I 21 WR I 22 RD I CPU interface read signal 23 A12 I CPU interface address bus 24 DVDD P Digital system power supply 25 CLKIN I System clock input 26 A11 I 27 A10 I 28 A9 I 29 CS I CPU interface chip select signal 30 ICLK I External sampling point signal input 31 TRIG I External trigger signal input 32 RESET I System reset 33 SAMP/LININT O A/D converter sampling point monitor signal output/LINE signal output 34 TEST I Test pin (Must be tied to the digital system ground in normal operation.) 35 REF I DRAM refresh signal input 36 AGND P Analog system ground 37 DALRL I Low reference for the D/A converter used for the A/D converter low reference. 38 DAHRL I Low reference for the D/A converter used for the A/D converter high reference. Digital system ground CPU interface address bus CPU interface write signal CPU interface address bus 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. Symbol I/O 39 AIN I Sensor signal input Function 40 TEMP I Temperature signal input 41 ATAPH O Analog middle level for the A/D converter high reference 42 DAHRH I High reference for the D/A converter used for the A/D converter high reference. 43 AVDD P Analog system power supply 44 DALRH I High reference for the D/A converter used for the A/D converter low reference. 45 ATAPL O Analog middle level for the A/D converter low reference 46 AGND P Analog system ground 47 PD7/SD O DMA output/serial data output 48 PD6/SDCK O DMA output/serial data transfer clock 49 DGND P Digital system ground 50 PD5/SDE O DMA output/serial data output valid period signal 51 PD4/PP4 B 52 PD3/PP3 B 53 PD2/PP2 B 54 PD1/PP1 B 55 PD0/PP0 B 56 DVDD P Digital system power supply 57 DACK/PP5 B DMA data acknowledge signal input pin/general-purpose I/O port DMA output/general-purpose I/O ports 58 DREQ/PP6 B DMA data request signal output/general-purpose I/O port 59 MTP/PP7 B Motor drive timing signal output/general-purpose I/O port 60 CLK2 O 61 CLK1 O 62 RS O 63 SH O 64 DGND P Sensor drive signal outputs Digital system ground 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 µF 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. ■ 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. ■ Anyone purchasing any products described or contained herein for an above-mentioned use shall: ➀ 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: ➁ 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. ■ 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