This product has reached end of life and has been replaced by CFA634YFHKS

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                This product is discontinued and has been replaced by CFA634-YFH-KS
20x4 SPI Character LCDPart Number: CFA634-NFA-KSCFA-634 Serial LCD 20x4, RoHS Compliant, No Backlight, FSTN Positive, Reflective, 0°C to +50°C, 6:00

Recommended replacement parts:

CFA634-YFH-KS or CFA634-TFH-KS
Product VariationsInterfacesLogic Level Serial InvertedSPILogic Level SerialI2CUSBRS232
ColorsYellow-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
        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
            Logic Level Serial, RS232, SPI

 picture_as_pdf Datasheets
picture_as_pdfCFA-634 v2.0.pdf
(Datasheet V 2.0, Hardware 2.3, Firmware 2.0)
picture_as_pdf634full v0 7.pdf
(Datasheet V 1.0, Hardware 0.7, Firmware 0.7)

Interfaces	Logic Level Serial Inverted SPI Logic Level Serial I2C USB RS232

Colors	Yellow-Green on Black Yellow-Green LED Backlight White on Blue White LED Backlight Black on Yellow-Green Yellow-Green LED Backlight Dark on Light-Gray White LED Backlight

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

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%

Notices

Part Change Notices

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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.

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

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)

20x4 SPI Character LCD

Part Number: CFA634-NFA-KS

Product Variations

Interfaces

Colors

Physical Characteristics

Optical Characteristics

Environmental

Electronics

Part Change Notices

Subscribe to Part Change Notices by email or RSS

Part Change Notice #10580: Reverted the SPI functionality to Crystalfontz CFA634 legacy implementation

Part Change Notice #10454: New v3.1 hardware version for CFA634 family of modules.

Part Change Notice #10308: Update CFA634 series to firmware v2.3 and wide temperature LCD.

LCD Software

User Forum

Tech Support

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