USB LCD Displays
Dark 20x4 Character USB LCD Module
Part Number: CFA634-YDI-KU
USB 20x4 character LCD module, RoHS / REACH compliant, Yellow-Green LED Backlight, FFSTN Negative (black), Transmissive, -20°C to +70°C operation, 6:00 viewing angle.
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 overlay to fit two 5.25" wide bays is available.
- The CFA634 can use any of SIX interfaces on any modules in the family by simply changing the interface selection using a command setting and making the appropriate jumper configurations.
- 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.
- 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.
Currently Shipping: HW Version 3.2, Firmware Version: 3.3.1
Product Variants
RS232
Logic Level Serial
SPI
I2C
USB
Logic Level Serial Inverted
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Datasheet
Previous Versions of Datasheets
CFA634 Series Data Sheet Release 2015-03-30.pdf
(Datasheet V 2015-03-30, Hardware 3.2, Firmware 3.2)
(Datasheet V 2015-03-30, Hardware 3.2, Firmware 3.2)
CFA634 Family Data Sheet Release 2013-09-10.pdf
(Datasheet V 2013-09-10, Hardware 3.1, Firmware 3.1)
(Datasheet V 2013-09-10, Hardware 3.1, Firmware 3.1)
CFA634 Family Preliminary Data Sheet Release 2013-08-21.pdf
(Datasheet V 2013-08-21, Hardware 3.1, Firmware 3.1)
(Datasheet V 2013-08-21, Hardware 3.1, Firmware 3.1)
Compliance Documents
TECHNICAL SPECS
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 |
| Diagonal Dimension | 3.92" |
| 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 | 7.3 |
| inches | 0.151 | 0.287 |
| 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 | 119g |
Optical Characteristics
| Glass Type | FFSTN |
| Polarizer | Transmissive |
| View Direction | 6 o'clock |
| Backlight Color | Yellow-Green |
| Backlight Type | LED |
| Mode | Negative |
| Foreground Color | Yellow-Green |
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% |
Electronics
| Interface | USB |
Part Change Notice
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Part Change Notice #11226: Change to ENIG from Gold Plating
Part Change Notice #11204: CFA634 Update to PCN11149
| Products Affected: | CFA634-TFH-KS, CFA634-TMI-KS, CFA634-YFH-KS, CFA634-YDI-KS, CFA634-TFH-KU, CFA634-TMI-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-YDI-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: | June 19, 2023 |
| Summary: | CFA634 Update to PCN11149 |
| Description: | Update to PCN11149: Electrical characteristics will be different including logic voltage. The inputs will be 5V tolerant but outputs from the CFA634 display modules will be 3.3V. For detailed changes, we will be releasing the updated datasheets on the relevant product pages. Contact support@crystalfontz.com if you would like to be notified when the updated datasheet is released. Original notice: The CFA634 family is having a hardware revision that utilizes a new processor and has other improvements that include: an independent voltage source so that the contrast is not affected by the input voltage, an interface select button, and will now support packet-based communication. The firmware has also been updated with additional features. JPBL will be closed by default which will enable the backlight to be powered from USB. Please refer to the datasheet for more information about the new hardware and firmware functions. |
| Reason: | Continuous improvement for this family of products. |
| Availability: | Contact Crystalfontz Support for up-to-date information by emailing support@crystalfontz.com. Contact Crystalfontz Sales to order samples of the new revision by emailing sales@crystalfontz.com. |
Part Change Notice #11149: New Hardware Revision
Part Change Notice #10658: Deprecation of "Drive Bay Kit Configurator" / New part numbers for drive bay kits.
| Products Affected: | CFA631-RMF-KU, CFA633-YYB-KS, CFA633-TMC-KS, CFA633-RMC-KS, CFA633-YYB-KU, CFA633-TMC-KU, CFA633-RMC-KU, CFA635-YYE-KS, CFA635-TMF-KS, CFA635-TFE-KS, CFA635-TMF-KL, CFA635-TFE-KL, CFA631-TMF-KU, CFA635-TFE-KU, CFA635-YYE-KL, CFA635-TMF-KU, CFA635-YYE-KU, DS635-AL, DS635-BG, DS635-BK, DS635-AK, CFA533-YYH-KS, CFA533-YYH-KU, CFA533-TMI-KS, CFA533-TMI-KU, CFA533-YYH-KL, CFA533-TMI-KL, CFA533-YYH-KC, CFA533-TMI-KC, CFA533-YYH-KI, CFA633-YYH-KS, CFA633-TMI-KS, CFA633-YYH-KU, CFA633-TMI-KU, CFA632-YFH-KS, CFA632-YDI-KS, CFA632-YFH-KU, CFA632-YDI-KU, CFA634-TFH-KS, CFA634-TMI-KS, CFA634-YFH-KS, CFA634-YDI-KS, CFA634-TFH-KU, CFA634-TMI-KU, CFA634-YFH-KU, CFA634-YDI-KU, CFA633-RDI-KU, CFA633-RDI-KS, CFA533-TFH-KU, CFA533-TFH-KS, CFA633-TFH-KU, CFA633-TFH-KS, CFA533-TFH-KL, CFA533-TFH-KC, CFA735-TFK-KR, CFA735-TFK-KT, CFA735-TML-KR, CFA735-TML-KT, CFA735-YYK-KR, CFA735-YYK-KT, CFA632-YDI-KL, CFA632-YDI-KN, CFA632-YDI-KC, CFA632-YDI-KP, CFA632-YFH-KL, CFA632-YFH-KN, CFA632-YFH-KC, CFA632-YFH-KP, CFA634-YDI-KC, CFA634-TMI-KC, CFA634-YFH-KC, CFA634-TFH-KC, CFA634-YFH-KL, CFA634-TFH-KL, CFA634-TMI-KL, CFA634-YDI-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, CFA631P-TMF-KU |
| Date Issued: | July 1, 2015 |
| Summary: | Deprecation of "Drive Bay Kit Configurator" / New part numbers for drive bay kits. |
| Description: | Starting August 1, 2015 the "Drive Bay Kit Configurator" located at https://www.crystalfontz.com/products/select_kit.html will no longer be functional for ordering one of our Serial or USB displays (CFA533, CFA631, CFA632, CFA633, CFA634, CFA635, and CFA735) in a bracket or SLED. This functionality is being moved to the Customize and Add to Cart process when checking out. This will allow for further customization by our customers to better fit their needs. This change will eliminate the current "kits", but will add options not previously available such as pre-configured ATX functionality, and ALL the currently available interfaces will be orderable in a drive bay bracket or SLED. The new part numbers will have the bracket / SLED and overlay type as a PREFIX to the configured part number. The choice for bracket / SLED to a display order will be via the cart options. Our CFA835 displays were introduced with these configuration options. To see how the new options will look, and what the new part numbers will look like, please see one of our CFA835 parts: https://www.crystalfontz.com/cart/addtocart.php?product_id=2277&qty=1 NOTE: The SLED is only available for the CFA635, CFA735, and CFA835 products. |
| Reason: | As part of our continuous improvement process, we are integrating the ordering of displays in drive bay and SLED kits as part of the display ordering process. |
| Impact: | Drive bay kits in their current configuration will no longer be available. |
| Recommendation: | Place orders prior to 2015-08-01 for upcoming production needs via our website or by contacting our logistics department via email: sales@crystalfontz.com, or by calling 1-888-206-9720 (International call +1-509-892-1200). After the 2015-08-01, please contact our engineering department via support@crystalfontz.com to assist you with ordering your bracket / SLED kits. |
| Availability: | Starting 2015-08-01, the bracket and SLED options for our serial and USB display will be part of the ordering process for the displays |
| Price Change: | Pricing bracket / SLED configurations will reflect manufacturing costs. |
Part Change Notice #10650: CFA634 Firmware update
Part Change Notice #10580: Reverted the SPI functionality to Crystalfontz CFA634 legacy implementation
Product Update #10494: New pricing for CFA634 family effective 2013-07-01
| Products Affected: | CFA634-TFH-KS, CFA634-TMI-KS, CFA634-YFH-KS, CFA634-YDI-KS, CFA634-TFH-KU, CFA634-TMI-KU, CFA634-YFH-KU, CFA634-YDI-KU |
| Date Issued: | May 17, 2013 |
| Summary: | New pricing for CFA634 family effective 2013-07-01 |
| Description: | PCN #10454 announced the new v3.1 hardware version for CFA634 family of modules: https://www.crystalfontz.com/products/pcn.phtml?id=10454 Pricing at the time of the PCN was issued was published as TBD. This update notices publishes pricing for the CFA634 family of modules effective 2013-07-01 2013-07-01 Edit: Corrected TMI variant 200 piece pricing. |
| Impact: | All CFA634 based parts. |
| Availability: | New pricing is effective orders placed on 2013-07-01 or later. |
| Price Change: | - - Effective 2013-07-01 - - CFA634-TFH-KS and CFA634-TFH-KU 1 + : US$55.00 10 + : US$49.40 20 + : US$46.60 50 + : US$43.90 100 + : US$41.20 200 + : US$38.40 500 + : US$35.70 1000 + : US$32.90 CFA634-TMI-KS and CFA634-TMI-KU 1 + : US$54.00 10 + : US$48.40 20 + : US$45.70 50 + : US$43.00 100 + : US$40.30 200 + : US$38.00 500 + : US$35.00 1000 + : US$32.30 CFA634-YDI-KS and CFA634-YDI-KU 1 + : US$56.00 10 + : US$49.80 20 + : US$47.00 50 + : US$44.30 100 + : US$41.50 200 + : US$38.70 500 + : US$36.00 1000 + : US$33.20 CFA634-YFH-KS and CFA634-YFH-KU 1 + : US$54.00 10 + : US$47.90 20 + : US$45.20 50 + : US$42.60 100 + : US$39.90 200 + : US$37.20 500 + : US$34.60 1000 + : US$31.90 |
Part Change Notice #10455: New v3.1 firmware to support CFA634 hardware v3.1 family of module
Part Change Notice #10454: New v3.1 hardware version for CFA634 family of modules.
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:
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=10308 |
| 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 |
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:
|
| 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) |
Compatible Cables
For reference only. For design purposes, please use the specifications in the datasheet.
