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This product is discontinued and has been replaced by CFA634-YDI-KU

20x4 USB Character LCD

Part Number: CFA634-YMC-KU

This is an early version of the CFA634. This page just exists for historical reference. If you'd like to puchase a current CFA634 please click here to see all our current CFA634 products.
  • square_foot Physical Characteristics

    Physical Characteristics

    Characters x Lines 20 x 4
    Module Overall width height depth
    millimeters 130 63 19.9
    inches 5.118 2.480 0.783
    PCB Outline width height depth
    millimeters 130 63 19.9
    inches 5.118 2.480 0.783
    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
  • visibility Optical Characteristics

    Optical Characteristics

    Glass Type/Glass Color STN/Blue
    Polarizer Transmissive
    View Direction 6 o'clock
    Backlight Color Yellow-Green
    Backlight Type LED
    Mode Negative
    Foreground Color Yellow
    Background Color Dark
  • nature Enviromental

    Environmental

    Operating Temperatures min max
    Celsius 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

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  • 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 #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.