Product
This product is discontinued please contact support to see if there is a replacement part available.
SPI 20x4 Character LCD (EOL)
Part Number: CFA634-NFG-KS
CFA-634 Serial LCD 20x4, RoHS Compliant, No Backlight, FSTN Positive, Reflective -20°C to +70°C 6:00
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:
- 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.
- 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.
- 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.
- 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 Variations
Interfaces | Logic Level Serial InvertedSPILogic Level SerialI2CUSBRS232 |
|---|
Colors | Yellow-Green on Black Yellow-Green LED BacklightWhite on Blue White LED BacklightBlack on Yellow-Green Yellow-Green LED BacklightDark on Light-Gray White LED Backlight |
|---|
- square_foot Physical Characteristics
Physical Characteristics
Characters x Lines 20 x 4 Module Overall width height depth millimeters 130 63 15.9 inches 5.12 2.48 0.63 PCB Outline width height depth millimeters 130 63 15.9 inches 5.12 2.48 0.63 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 0.151 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 Environmental
Environmental
Operating Temperatures min max Celsius -20° 70° Fahrenheit -4° 158° Storage Temperatures min max Celsius -30° 80° Fahrenheit -22° 176° Humidity min max Non-condensing 0% 90% - cable Electronics
Electronics
Interface Logic Level Serial, RS232, SPI -
picture_as_pdf Datasheets
Part Change Notices
Subscribe to Part Change Notices by email 
or RSS 
- text_snippet
Part Change Notice #10580: Reverted the SPI functionality to Crystalfontz CFA634 legacy implementation
- text_snippet
Part Change Notice #10455: New v3.1 firmware to support CFA634 hardware v3.1 family of module
- text_snippet
Part Change Notice #10454: New v3.1 hardware version for CFA634 family of modules.
- text_snippet
Part Change Notice #10316: Minor PCB revision to accommodate longer life MLCC capacitors. Hardware and firmware updating to v2.4.
Products Affected: 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 1, 2011 Summary: Minor PCB revision to accommodate longer life MLCC capacitors. Hardware and firmware updating to v2.4. Last revision: Hardware v2.3, Firmware v2.3 Description: In a continuation of product improvement the CFA634 series has the following improvements:
- PCB changes to accommodate MLCC capacitors. This hardware revision to v2.4 impacts C7, C3, and C4.
- The firmware will be updated to v2.4 to reflect the new hardware version. No other changes to the firmware are being made.
Minor PCB revision to v2.4 to accommodate longer life MLCC capacitors. Firmware will be updated to v2.4 reflect hardware version.Reason: Manufacturing improvements allow for building the CFA634 series with MLCC capacitors. The MLCC have a longer life than the electrolytic capacitors currently being used. Impact: The new version is designed to be Fit, Form, and Function compatible with previous versions of the CFA634 series.
Please see the v2.3 PCN for physical differences from older versions:
https://www.crystalfontz.com/products/pcn.phtml?id=10308Recommendation: 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 - text_snippet
Product Update #10313: New Product in Intelligent Serial LCD Modules: CFA634-NFG-KS
- 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:
- Wide temperature support with -20°C to +70°C operation / -30°C to +80°C storage
- 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.
- 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.
- 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)
