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Ordering number : EN*5735

Preliminaly

CMOS LSI

LC821031

Image-Processing IC for Facsimile, Copier,

and OCR Products

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 power-

supply 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

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

Conditions

Ta ≤ 70°C

Hand soldering: 3 seconds

Reflow soldering: 10 seconds

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

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

Function

39 AIN

I Sensor signal input

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

44 DALRH

P Analog system power supply

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

53 PD2/PP2

B

DMA output/general-purpose I/O ports

B

54 PD1/PP1

B

55 PD0/PP0

B

56 DVDD

57 DACK/PP5

P Digital system power supply

B DMA data acknowledge signal input pin/general-purpose I/O port

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

Sensor drive signal outputs

62 RS O

63 SH O

64 DGND

P 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

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