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This product is discontinued and has been replaced by CFA634-TFH-KU

20x4 USB Character LCD

Part Number: CFA634-NFA-KU

CFA-634 Serial LCD 20x4, RoHS Compliant, No Backlight, FSTN Positive, Reflective, 0°C to +50°C, 6:00
Recommended replacement parts:
CFA634-YFH-KU or CFA634-TFH-KU

CFA634 Family Characteristics:
  • Large easy-to-read LCD in a compact size can display 20 characters x 4 lines. Overall module size is 130.00 mm, width x 63.00 mm height x 19.90 mm depth (5.12" x 2.48" x 0.78"). Character height is 7.30 mm (0.29").
  • Attractive stainless steel bezel.
  • Optional PC CDROM mounting bracket with three choices of overlay to fit two 5.25" wide bays is available.
  • The CFA634 family has four colors choices:
  1. CFA634-TFH-Kx: White edge-lit LED backlight with positive STN transflective mode. Displays dark (near-black) characters on light (near-white) background. The display can be read in normal office lighting, in dark areas, andin bright sunlight.
  2. CFA634-TMI-Kx: White edge-lit LED backlight with negative STN transmissive mode LCD. Displays light (nearwhite) characters on a blue background. The display can be read in normal office lighting and in dark areas. May be difficult to read in direct sunlight.
  3. CFA634-YDI-Kx: Yellow-green array LED backlight with negative FFSTN transmissive mode LCD. Displays yellow-green characters on a dark (near-black) background. The display can be read in normal office lighting and in dark areas. May be difficult to read in direct sunlight.
  4. CFA634-YFH-Kx: Yellow-green array LED backlight with positive FSTN transflective mode LCD. Displays dark (near-black) characters on yellow-green background. The display can be read in normal office lighting, in dark areas, and in bright sunlight.
  • Use any of six interfaces on any module in the CFA634 family by simply changing the interface selection in a command and using the appropriate jumper configurations.
  • The displays have a 6 o’clock viewing angle (polarizer viewing direction).
  • Adjustable contrast. The module’s default contrast value will be acceptable for many applications. If necessary, you can adjust the contrast by using control function.
  • The modules have a RockWorks RW1067 controller.
  • Extended voltage (9-15 volts for interfaces using DB9 connector) and 5 volts power inputs standard for the controller.
  • Backlight is 5 volts only.
  • Use the nonvolatile memory capability (EEPROM) to customize the “power-on” display settings.
  • Wide temperature range for operation is -20°C to +70°C.
  • RoHS compliant. You can download the RoHS and REACH documents from the Datasheets & Files section.

Product Variants

DetailsLight Blue 20x4 Character I2C LCDLight Blue 20x4 Character I2C LCD
I2C,
DetailsLight Blue Logic Level Serial 20x4 Character LCDLight Blue Logic Level Serial 20x4 Character LCD
Logic Level Serial,
Details20x4 Logic Level Inverted Serial Character LCD20x4 Logic Level Inverted Serial Character LCD
Logic Level Serial Inverted,
DetailsBlue SPI 20x4 Character LCDBlue SPI 20x4 Character LCD
SPI,
Details20x4 RS-232 Serial Character LCD20x4 RS-232 Serial Character LCD
RS232,
DetailsLight Blue 20x4 Character USB LCDLight Blue 20x4 Character USB LCD
USB,
DetailsBlue 20x4 Character I2C LCDBlue 20x4 Character I2C LCD
I2C,
DetailsBlue 20x4 Logic Level Serial Character LCDBlue 20x4 Logic Level Serial Character LCD
Logic Level Serial,
DetailsInverted Logic Level Serial 20x4 Character LCDInverted Logic Level Serial 20x4 Character LCD
Logic Level Serial Inverted,
DetailsDark Blue SPI 20x4 Character LCDDark Blue SPI 20x4 Character LCD
SPI,
DetailsBlue 20x4 Serial RS-232 Character LCDBlue 20x4 Serial RS-232 Character LCD
RS232,
Details20x4 Character Display Module20x4 Character Display Module
USB,
DetailsDark 20x4 Character I2C LCDDark 20x4 Character I2C LCD
I2C,
DetailsLogic Level Serial 20x4 Character LCDLogic Level Serial 20x4 Character LCD
Logic Level Serial,
DetailsSerial Inverted Logic Level 20x4 Character LCDSerial Inverted Logic Level 20x4 Character LCD
Logic Level Serial Inverted,
DetailsFFSTN Negative 20x4 Character SPI LCDFFSTN Negative 20x4 Character SPI LCD
SPI,
Details20x4 Serial RS-232 Character LCD20x4 Serial RS-232 Character LCD
RS232,
DetailsDark 20x4 Character USB LCD ModuleDark 20x4 Character USB LCD Module
USB,
DetailsYellow 20x4 Character I2C LCDYellow 20x4 Character I2C LCD
I2C,
Details20x4 Logic Level Serial Character LCD20x4 Logic Level Serial Character LCD
Logic Level Serial,
Details20x4 Inverted Logic Level Serial Character LCD20x4 Inverted Logic Level Serial Character LCD
Logic Level Serial Inverted,
DetailsYellow-Green 20x4 Character SPI LCDYellow-Green 20x4 Character SPI LCD
SPI,
Details20x4 Serial RS232 Character LCD20x4 Serial RS232 Character LCD
RS232,
Details20x4 Character Display LCD20x4 Character Display LCD
USB,
  • square_foot Physical Characteristics

    Physical Characteristics

    Characters x Lines 20 x 4
    Module Overall width height depth
    millimeters 130 63 15.9
    inches 5.118 2.480 0.626
    PCB Outline width height depth
    millimeters 130 63 15.9
    inches 5.118 2.480 0.626
    Viewing Area Width Height
    millimeters 102 41.5
    inches 4.016 1.634
    Active Area Width Height
    millimeters 93.54 34
    inches 3.683 1.339
    Character Size Width Height
    millimeters 3.84 6.38
    inches 0.151 0.251
    Character Pitch Width Height
    millimeters 4.68 8.9
    inches 0.184 0.350
    Dot Size Width Height
    millimeters 0.72 0.86
    inches 0.028 0.034
    Dot Pitch Width Height
    millimeters 0.78 0.92
    inches 0.031 0.036
    Weight 147g
  • visibility Optical Characteristics

    Optical Characteristics

    Glass Type/Glass Color FSTN/Light Gray
    Polarizer Reflective
    View Direction 6 o'clock
    Sunlight Readable Yes
    Backlight Type None
    Mode Positive
    Foreground Color Dark
    Background Color Light Gray
  • nature Enviromental

    Environmental

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

    Electronics

    Interface USB
  • picture_as_pdf Datasheets
    picture_as_pdf
    CFA-634 v2.0.pdf
    (Datasheet V 2.0, Hardware 2.3, Firmware 2.0)
    picture_as_pdf
    634full v0 7.pdf
    (Datasheet V 1.0, Hardware 0.7, Firmware 0.7)


Part Change Notice

Subscribe to Part Change Notices by email Email subscription for changes to CFA634-NFA-KU or RSS RSS feed for changes to CFA634-NFA-KU
  • text_snippet
    Part Change Notice #10580: Reverted the SPI functionality to Crystalfontz CFA634 legacy implementation
    Products Affected: CFA634-YMC-KS, CFA634-NFA-KS, CFA634-TFB-KS, CFA634-TMC-KS, CFA634-YFB-KU, CFA634-YMC-KU, CFA634-NFA-KU, CFA634-TFB-KU, CFA634-TMC-KU, CFA634-NFG-KS, CFA634-TFH-KS, CFA634-TMI-KS, CFA634-YFH-KS, CFA634-YDI-KS, CFA634-NFG-KU, CFA634-TFH-KU, CFA634-YFH-KU, CFA634-YDI-KU, CFA634-YDI-KC, CFA634-TMI-KC, CFA634-YFH-KC, CFA634-TFH-KC, CFA634-YFH-KL, CFA634-TFH-KL, CFA634-TMI-KL, CFA634-TFH-KP, CFA634-YFH-KP, CFA634-TMI-KP, CFA634-YDI-KP, CFA634-TFH-KN, CFA634-YFH-KN, CFA634-TMI-KN, CFA634-YDI-KN
    Date Issued: December 20, 2013
    Summary: Reverted the SPI functionality to Crystalfontz CFA634 legacy implementation
    Last revision: v3.1.5
    Description: Reverted the SPI functionality to Crystalfontz CFA634 legacy implementation where the MISO line is used as a busy indicator instead of the module's unused transmit line. Firmware will migrate from v3.1.5 to v3.1.6.
    Reason: To maintain legacy functionality.
    Impact: Impact to customers utilizing SPI functionality only.
    Recommendation: For questions please contact Technical Service at 1-888-206-9720.
  • text_snippet
    Part Change Notice #10454: New v3.1 hardware version for CFA634 family of modules.
    Products Affected: CFA634-NFA-KS, CFA634-TFB-KS, CFA634-NFA-KU, CFA634-TFB-KU, CFA634-NFG-KS, CFA634-TFH-KS, CFA634-TMI-KS, CFA634-YFH-KS, CFA634-YDI-KS, CFA634-NFG-KU, CFA634-TFH-KU, CFA634-TMI-KU, CFA634-YFH-KU, CFA634-YDI-KU
    Date Issued: February 6, 2013
    Summary: New v3.1 hardware version for CFA634 family of modules.
    Last revision: HW v2.4
    Description: As part of our continuous improvement process, the CFA634 family of modules has been redesigned to fall more in line with our other Value Add families of intelligent modules.

    The module is keeping the same dimensions, mounting points, and existing header locations.

    Changes:
    - LCD controller is changing from Samsung S6A0073 to Rockworks RW1067
    - Holtek HT48R30 is being replaced by Cypress PSoC CY8C27443
    - USB interface integrated on PCB using FTDI FT232RL
    - PCB layout changed to accommodate new LCD controller, new microcontroller, integrated USB interfaces
    - The following hardware functionality has been migrated to firmware control;
    - - Interface selection
    - - Data normal / Inverted
    - - Splash screen control
    - - Baud rate

    * Specifications are subject to change
    Reason: Samsung S6A0073 LCD controller is EOL. Module has been redesigned to incorporate the Rockworks RW1067. The Holtek HT48R30 one-time-programmable controller replaced with the Cypress PSoC CY8C27443 for improved functionality.
    Impact: This new hardware version is designed to be as fit and form compatible as possible with the current shipping hardware. There are major changes to the PCB layout due to the re-design of the CFA634 family.

    Existing header locations and mounting points are renaming the same.

    Additional header locations have been added for programming the PSoC and future functionality.
    Recommendation: Engineering samples should be available Quarter 3, 2013. Please send an email to support@crystalfontz.com to work with our engineering and support team to assist you with the migration.
    Availability: Q3 2013 - Samples available
    End of Q3 / Beginning Q4 2013 - Transition to new version when previous version is exhausted
    Q1 2014 - All CFA634 shipments new hardware
    Price Change: We are anticipating an increase in pricing.
    New pricing is TBD
  • text_snippet
    Part Change Notice #10308: Update CFA634 series to firmware v2.3 and wide temperature LCD.
    Products Affected: CFA634-YMC-KS, CFA634-NFA-KS, CFA634-TFB-KS, CFA634-TMC-KS, CFA634-YFB-KU, CFA634-YMC-KU, CFA634-NFA-KU, CFA634-TFB-KU, CFA634-TMC-KU, CFA634-NFG-KS, CFA634-TFH-KS, CFA634-TMI-KS, CFA634-YFH-KS, CFA634-YDI-KS, CFA634-NFG-KU, CFA634-TFH-KU, CFA634-TMI-KU, CFA634-YFH-KU, CFA634-YDI-KU
    Date Issued: January 10, 2011
    Summary: Update CFA634 series to firmware v2.3 and wide temperature LCD.
    Last revision: Hardware v2.3, Firmware v2.0
    Description: In a continuation of product improvement the CFA634 series has the following improvements:
    1. Wide temperature support with -20°C to +70°C operation / -30°C to +80°C storage

    2. The bezel changed from black painted metal to stainless steel. Stainless steel has lower environmental impact and improves ESD protection. If your design has the bezel exposed, it will show the silver color of the stainless steel rather than the previous painted black bezel.

    3. The previous CFA634-YMC-KS and CFA634-YMC-KU (new CFA634-YDI-KS and CFA634-YDI-KU) changed from STN to double negative (FFSTN) LCD for improved appearance.

    4. Firmware revision to match hardware revision and is now displayed on the boot screen
      Reason: Improvements in design allow for better manufacturing, ESD protection, and appearance.
      Impact: The new version is designed to be Fit, Form, and Function compatible with previous versions of the CFA634 series. Semi-Custom and Defined Parts will have updated part numbers.
      Recommendation: Engineering samples should be available by the end of Quarter 1, 2011. Please send an email to support@crystalfontz.com to work with our engineering and support team to assist you with the migration.
      Availability: Volume availability Second Quarter 2011.
      Price Change: No price change at this time
      Attachment: 634_Wide_Temp_PCN.pdf (285KB)
    5. text_snippet
      Part Change Notice #10281: Revision change for USB board because we have changed the layout of the board, also the silk screen.
      Products Affected: CFA632-YFB-KU, CFA632-YMC-KU, CFA632-NFA-KU, CFA634-YFB-KU, CFA634-YMC-KU, CFA634-NFA-KU, CFA634-TFB-KU, CFA634-TMC-KU
      Date Issued: May 14, 2010
      Summary: Revision change for USB board because we have changed the layout of the board, also the silk screen.
      Description: Changed from v3.0 to v3.1, added ground trace around outside of PCB, changed layout, made aesthetic changes to the silk screen.
      Reason: Wanted to add 94v0 and WEEE symbol (trash can with "X") to the silk screen.
      Impact: Put new photos of the changed USB board on the site on the LCD modules which have the change.
      Availability: Immediately
      Price Change: None.
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