lm9831 National Semiconductor Corporation, lm9831 Datasheet - Page 38

• Manufacturer Part Number: lm9831
• Description: 42-bit Color, 1200dpi Usb Image Scanner
• Manufacturer: National Semiconductor Corporation

RESET
Sensor
Image
CCD
CIS
LM9831 Digital Block Diagram
or
Analog
Front
End
System Synchronization and Control
Lamp Counter, Command Interpreter
14
Pixel Counter, Stepper Counter,
Processing
DPI adjust)
(Horizontal
The Brains
CRYSTAL/ EXT
Pixel
CLOCK
16
Sensor (Offset and Shading)
Buffer Out Address Counter
Buffer In Address Counter
24/48
Line Buffer Controller
Subtraction
Pixel-Rate
Address Counter
16
Offset
CRYSTAL
OUT
System Clock
16
Generation
48MHz
Pixel-Rate
(Shading)
Multiplier
16 x 16
16
CRYSTAL
IN
38
Pause Scanning
Resume Scanning
Gamma
Table
Address
12
17
20
20
Modes
Test
Test
14 Bit
Pixel Data
Multiplexer
Controller
Address
DRAM
and
External EEPROM
Configuration
Internal ROM
EXTERNAL
SCL
Registers
EEPROM
SDA
16
Processing
(Packing)
8
Pixel
www.national.com
Controller
Stepper
CMODE
Interface
Motor
USB
16
16
10
2
4
3
3
2
6
16
D+, D-
Active/Suspend
Bus Power
RD
WR
RAS
CAS
A0-A9
DRAM
Address Bus
Power
Transistors
Current
Feedback
Lamp
Control
PAPER
SENSORS 1,2
MISC I/O 1-6
D0-D15
DRAM
Data Bus