USB LCD Displays
20x4 SPI Character LCD
Part Number: CFA634-YFH-KP
SPI interface, 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.
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 |
| 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/Glass Color | FSTN/Light-Gray |
| Polarizer | Transflective |
| View Direction | 6 o'clock |
| Sunlight Readable | Yes |
| Backlight Color | Yellow-Green |
| Backlight Type | LED |
| Mode | Positive |
| Foreground Color | Dark |
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 | SPI |
Part Change Notice
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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, 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
| Products Affected: | 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, 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 |
| Date Issued: | March 25, 2015 |
| Summary: | CFA634 Firmware update |
| Last revision: | 3.1 |
| Description: | As part of our continuous improvement process, the CFA634 firmware is being revised from 3.1 to 3.2 with the following changes:
Updated datasheet will include details of the above changes, as well as general fixes. |
| Reason: | Bug fixes and usability improvements. |
| Impact: | Changes effect all CFA634 products. Firmware update is compatible with existing code, other than changes to command 30. |
| Recommendation: | Prior to implementing the new firmware into production, it is recommended that engineering samples be ordered and tested. |
| Availability: | Displays with new firmware will begin shipping during 2Q 2015. |
| Price Change: | No price change is planned for this change. |
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. |
Product Update #10531: (New Product) CFA634YFHKP
| New Product: | CFA634-YFH-KP |
| Date Issued: | August 29, 2013 |
| Summary: | (New Product) CFA634YFHKP |
| Description: | Intelligent Serial LCD Modules: SPI Interface, 20x4 LCD module, Y/G LED Backlight, FSTN Positive, -20°C to +70°C, 6:00 |
For reference only. For design purposes, please use the specifications in the datasheet.
