lm9831 National Semiconductor Corporation, lm9831 Datasheet

lm9831

Manufacturer Part Number

lm9831

Description

42-bit Color, 1200dpi Usb Image Scanner

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM9831.pdf (41 pages)

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LM9831 42-Bit Color, 1200dpi USB Image Scanner

General Description

The LM9831 is a complete USB image scanner system on a sin-

gle IC. The LM9831 provides all the functions (image sensor

control, illumination control, analog front end, pixel processing

function image data buffer/DRAM controller, microstepping

motor controller, and USB interface) necessary to create a high

performance color scanner. The LM9831 scans images in 42 bit

color/14 bit gray, and has output data formats for 24 bit color/8

bit gray. The LM9831 supports sensors with pixel counts of up to

16384 pixels x 3 colors (1200 dpi x 13.6 inches).

The LM9831’s low operating and suspend mode supply currents

allow design of USB bus-powered scanners. The only additional

active components required are an external 4Mbit or 16Mbit

DRAM for data buffering and power transistors for the stepper

motor.

Applications

•

Features

• 14 bit ADC digitizes at up to 6Mpixels/s (2M RGB pixels/sec).

• Digital Pixel Processing provides 1200, 800, 600, 400, 300,

• Provides 50-2400dpi vertical resolution in 1 dpi increments.

• Pixel rate error correction for gain (shading) and offset errors.

• Supports 4 or 16Mbit external DRAMs.

• Multiple CCD clocking rates allows matching of CCD clock to

LM9831 Scanner System Block Diagram

TRI-STATE® is a registered trademark of National Semiconductor Corporation.

Color Flatbed Document Scanners

Color Sheetfed Document Scanners

200, 150, and 100dpi horizontal resolution from a 1200dpi

sensor and 600, 400, 300, 200, 150, 100, 75, and 50dpi

horizontal resolution from a 600dpi sensor.

scan resolution and pixel depth for maximum scan speed.

Illumination

CCD/CIS

1-3

2-6

1-3

LM9831CCVJD

USB

Port

Optional Serial

48MHz Crystal

EEPROM

• Stepper motor control tightly coupled with image data buffer

• PWM stepper motor current control allows microstepping for

• USB interface for Plug and Play operation on USB-equipped

• Serial EEPROM option for custom Vendor and Product IDs.

• Support for USB bus-powered operation.

• Pixel depths of 1, 2, or 4 bits are packed into bytes for faster

• Supports 3 channel CCDs and 1 channel CIS sensors.

• 3 (R, G, and B) 12-bit, user-programmable gamma correction

• Compatible with a wide range of color linear CCDs and

• Operates with 48MHz external crystal.

• Internal bandgap voltage reference.

• 100 pin TQFP package

Key Specifications

•

Analog to Digital Converter Resolution

Maximum Pixel Conversion Rate

A4 Color 150dpi scan time

A4 Color 300dpi scan time

A4 Color 600dpi scan time

Supply Voltage

- LM9831

- LM9831 DRAM I/O

Typical Operating Current Consumption

management to maximize data transfer efficiency.

the price of fullstepping.

computers.

scans of line art and low pixel depth images.

tables.

Contact Image Sensors (CIS).

8 MISC

I/O

DRAM

+24V

+4.75V to +5.25V

Stepper

www.national.com

+2.85 to +5.25V

Motor

<160 seconds

Transistors

<10 seconds

<40 seconds

October 1999

Power

134mA

14 Bits

6MHz

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