Sanyo LC821031 Image-processing ic for facsimile, copier, and ocr product Datasheet

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
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