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CFA634-YFB-KS

CFA-634 Serial LCD 20x4, RoHS Compliant, Yellow/Green LED Backlight, FSTN Positive, Transflective 0°C - +50°C 6:00

New in v2.0:

This display is the "v2.0" version of our serial display series. This version is generally command and mechanically compatible with our earlier 1.x series displays, while adding many improvements:

  • The LCD material is now FSTN (Film compensated Super Twisted Nematic) instead of STN. FSTN gives better contrast, faster response and makes an all-around more readable display.
  • The display now has the ability to store a customized boot screen of your design in its EEPROM. All features of the display are controlled: characters displayed, user-definable characters, backlight setting, contrast setting, cursor position, cursor style, "wrap" setting, "scroll" setting, and even the scrolling marquee.
  • The baud rates supported are now 19200, 9600, 4800 and 2400 baud. 1200 baud is no longer supported.
  • The PCB silkscreen has an abbreviated jumper setting table, so all the jumper settings are always in easy reference.
  • The CGROM is an enhanced version with many more useful characters: numeric superscripts, icons, mathematical symbols, some fractions, a great variety of arrows, many currency symbols, and more.
  • The processor’s reset circuit has been improved to handle a wider range of slow-turn-on power supply conditions.

Other Features:

  • DB9 connector provided for simple RS-232 hookup
  • Large, easy to read characters: 7.3mm (0.287") character height
  • Available with bright, even, software adjustable LED backlighting or in a low-power reflective model
  • Software controlled contrast
  • "Gapless" horizontal bargraphs
  • Software controlled terminal style automatic scrolling and line wrapping
  • Unique "Scrolling Marquee" feature continuously scrolls a message across the display without host intervention.
  • Low speed "SPI" (Fclk max=18KHz) and "Inverted TTL" RS-232 for embedded applications
  • Buffered communication
  • Single board construction--no connectors to fail
  • Large display area in a compact 108mm x 43mm (4.25" x 1.69")package
  • Thin:
    • Reflective is 15.9mm (0.626") including DB-9 connector
    • LED Backlit is 19.9mm (0.783") including DB-9 connector
  • Negative voltage for contrast generated on board
  • Extended voltage (9-15v) and 5v power inputs standard on all modules for the controller. Backlight is 5v only.
  • Low power: Non-backlight operation will self-power from the DTR and RTS lines of most serial ports.
  • Available in a LCD drive bay kit, (see mounting bracket photos)
  • Available with USB interface
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Intelligent Serial LCD Modules
CFA634-YFB-KS
CFA634YFBKS
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  • CFA-634 Serial LCD 20x4
  • RoHS Compliant
  • Yellow/Green LED Backlight
  • FSTN Positive
  • Transflective 0°C - +50°C 6:00
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Cables
WR-232-Y01
WR232Y01
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  • RS-232 DB-9(female) to DB-9(female) 6' straight through cable.
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WR-232-Y04
WR232Y04
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  • RS-232 DB-9 (female) to DB-9 (female) 10' straight through cable.
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WR-232-Y09
WR232Y09
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  • RS232 DB9 (female) to DB9 (male) 36" ribbon cable with bracket to fit PC expansion slot for CFA-632 and CFA-634 series modules.
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WR-232-Y10
WR232Y10
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  • RS232 DB9 (female) to DB9 (female) 13" straight through cable.
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WR-232-Y23
WR232Y23
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  • 26" DB9 to 10 pin cable used to connect a serial LCD module to a 10 pin header, either normal or alternate pinout.
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WR-PWR-Y02
WRPWRY02
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  • PC Power Supply to LED Backlight Power Cable
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Drive Bay Kits
DB634-ALYFB-KS1
CFA634YFBKSWR232Y09WR232Y10WRPWRY02DB634AL
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DB634-ALYFB-KS2
CFA634YFBKSWR232Y01WRPWRY02DB634AL
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DB634-BGYFB-KS1
CFA634YFBKSWR232Y09WR232Y10WRPWRY02DB634BG
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DB634-BGYFB-KS2
CFA634YFBKSWR232Y01WRPWRY02DB634BG
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DB634-BKYFB-KS1
CFA634YFBKSWR232Y09WR232Y10WRPWRY02DB634BK
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DB634-BKYFB-KS2
CFA634YFBKSWR232Y01WRPWRY02DB634BK
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DB634-TXYFB-KS1
CFA634YFBKSWR232Y09WR232Y10WRPWRY02DB634TX
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DB634-TXYFB-KS2
CFA634YFBKSWR232Y01WRPWRY02DB634TX
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For reference only. For design purposes, please use the specifications in the datasheet.

Physical Characteristics

Characters x Lines 20 x 4
Module Overall
width height depth
millimeters 130 63 19.9
inches 5.12 2.48 0.78
PCB Outline
width height depth
millimeters 130 63 19.9
inches 5.12 2.48 0.78
Viewing Area
width height
millimeters 102 41.5
inches 4.02 1.63
Active Area
width height
millimeters 93.54 34
inches 3.68 1.34
Character Size
width height
millimeters 3.84 6.38
inches 0.15 0.25
Character Pitch
width height
millimeters 4.68 8.9
inches 0.18 0.35
Dot Size
width height
millimeters 0.72 0.86
inches 0.03 0.03
Dot Pitch
width height
millimeters 0.78 0.92
inches 0.03 0.04

Optical Characteristics

Display Technology LCD
Display Addressing passive
Glass Type/Glass Color FSTN/Light-Gray
Polarizer Transflective
View Direction 6:00
Backlight Color Yellow-Green
Backlight Type LED
Mode Positive
Foreground Color Dark
Background Color Yellow-Green

Environmental

Operating Temperatures
min max
Celsius 0° 50°
Farenheit 32° 122°
Storage Temperatures
min max
Celsius -10° 60°
Farenheit 14° 140°
Humidity
min max
Non-condensing 0% 90%

Electronics

Interface Logic Level Serial, RS232, SPI

Datasheets

Current Version

CFA-634_v2.0.pdf (1MB)
Datasheet: v2.0, Hardware: v2.3, Firmware: v2.0

Previous Version (obsolete)

Other Files

1 to 1 Template (33KB)
Character Generator ROM (389KB)

Part Change Notices

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For reference only. For design purposes, please use the drawing in the datasheet.
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