GL843 datasheet(7/84 Pages) GENESYS

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GL843 High Speed USB2.0 With ADF 2-in-1 Scanner Controller For 3x

Page 7

CHAPTER 2

FEATURES

Highly integrated scanner controller chip (2-in-1; Scanner Controller and USB 2.0 Interface)

USB 2.0 High Speed (480Mbit) compliant

Designed for sheetfed, flatbed and transparency scanners

Supports key-matrix with latch function

Embedded RISC CPU for scanning, run-in and diagnostic tests

Supports external 24Kbytes flash ROM or internal 24Kbyte mask ROM

Firmware download to external flash ROM

12MHz low frequency clock input for better EMI

Flexible 3.3V/5V operating voltage for I/O pads

Adjustable working clock of scanner controller for different usage (12M, 24M, 30M, 40M, 48M, 60MHz)

Supports linear or stagger CCD, such as NEC, Toshiba or Sony CCD

Available sensor types: 600, 1200, 2400, 3200, 3600 and 4800dpi color CIS or CCD

Multi-TG control for CCD (separately controls the R/G/B exposure time)

Shutter-control for CCD (separately controls the R/G/B exposure time)

Supports two scanning types: pixel-by-pixel (pixel rate), line-by-line (line rate)

Support 48-bits color, 16-bits gray and 1-bit line-art

“True gray” with R, G and B weightings

16 bits white/dark shading and 16-to-8 bits Gamma correction

0.3us per pixel for color scanning under 40MHz working clock

0.2us per pixel for color scanning under 60MHz working clock

Supports LCM/LCD interface to display messages

Supports RS232 interface for special applications

Supports EEPROM (93C46) interface for special applications

Supports ADF (Auto-Document-Feeder) function with document, ADF and cover sensors

Lossless data compression

Lines packing for stagger CCD or R/G/B line differences

Fine CDS sampling adjustment to avoid the digital noise influence (8.33ns adjustment)

Digital average and hardware deletion for various resolutions

Hardware deletion for various resolutions (from 4800~1dpi with 1dpi decrement)

Supports 1M*16, 4M*16, 8M*16, 16M*16 and 32M*16 SDRAM

Supports 5 acceleration/deceleration motor tables for high speed motor moving and wall hitting protection

Supports controllable bipolar motor in full, half, quarter and eighth steps moving

Supports controllable unipolar motor in full and half steps moving

Supports V-reference automatic control for motor driver Ics

Build-in PWM control phase for unipolar motors

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