USB LCD Displays
20x4 Character USB Display
Part Number: CFA735-YYK-KR
USB + Logic Level (0-5v) Serial 20x4 LCD module with Keypad, Yellow-Green Edge LED Backlight, STN Positive, Yellow-Green, Transflective, -20°C to +70°C, 12:00 o'clock viewing direction.
Our CFA835-YYK is the exact same hardware, with graphic capabilities and direct access to the SD Card at the same low price.
Not sure which USB LCD module to choose? Compare all of our intelligent display modules.
- LED backlit 20x4 LCD.
- Integrated LED backlit 6-button translucent silicon keypad with screened legend.
- Four bicolor (red + green) LEDs. The LEDs’ brightness can controlled by the host software, which allows mixing the LEDs to produce other colors (yellow and orange.)
- Fully decoded keypad: any key combination is valid and unique.
- LCD characters are contiguous in both X and Y directions to allow the host software to display "gapless" bar graphs in horizontal or vertical directions.
- Robust packet based communications protocol with 16-bit CRC.
- Compact size: fits in a 1U rack mount case (37.5mm overall height.)
- ATX power supply control functionality allows the buttons on the CFA735 to replace the "power" and "reset" buttons on your system, simplifying your front panel design (requires additional cables or hardware).
- Built-in microcontroller with field-upgradeable firmware.
- Non-volatile memory capability ("EEPROM"):
- Customize the "power-on" display and LED settings.
- 16-byte "scratch" register for storing IP, netmask, system serial number
- Run STM32 embedded applications on the CFA735 hardware.
- Open source firmware for CFA735 displays allows you to customize and write/run your own user code.
Our CFA835-YYK is the exact same hardware, with graphic capabilities and direct access to the SD Card at the same low price.
Not sure which USB LCD module to choose? Compare all of our intelligent display modules.
Product Variants
Logic Level Serial/USB
RS232/USB
Need a written quote? Add to cart, then enter your email address in the "request a quote" box.
Datasheet
Previous Versions of Datasheets
CFA735-xxx-KR Data Sheet Release Date 2012-10-12.pdf
(Datasheet V 2012-10-12, Hardware 1v0, Firmware 0vB)
(Datasheet V 2012-10-12, Hardware 1v0, Firmware 0vB)
CFA735-xxx-KR Data Sheet 0v9 Preliminary.pdf
(Datasheet V 0v9 Preliminary, Hardware 0v9, Firmware 0v9)
(Datasheet V 0v9 Preliminary, Hardware 0v9, Firmware 0v9)
Compliance Documents
TECHNICAL SPECS
Physical Characteristics
| Characters x Lines | 20 x 4 |
| Module Overall | width | height | depth |
|---|---|---|---|
| millimeters | 142 | 38 | 21 |
| inches | 5.591 | 1.496 | 0.827 |
| *depth doesn't include Keypad | |||
| Diagonal Dimension | 3.19" |
| Viewing Area | width | height |
|---|---|---|
| millimeters | 83.1 | 27.54 |
| inches | 3.272 | 1.084 |
| Active Area | width | height |
|---|---|---|
| millimeters | 77.97 | 22.38 |
| inches | 3.070 | 0.881 |
| Character Size | width | height |
|---|---|---|
| millimeters | 3.23 | 4.88 |
| inches | 0.127 | 0.192 |
| Character Pitch | width | height |
|---|---|---|
| millimeters | 3.9 | 5.6 |
| inches | 0.154 | 0.220 |
| Dot Size | width | height |
|---|---|---|
| millimeters | 0.3 | 0.33 |
| inches | 0.012 | 0.013 |
| Dot Pitch | width | height |
|---|---|---|
| millimeters | 0.33 | 0.35 |
| inches | 0.013 | 0.014 |
| Weight | 57g |
| Keystroke Travel | 2.4mm |
| Keypad Depth | 12:00mm |
Optical Characteristics
| Glass Type/Glass Color | STN/Yellow-Green |
| Polarizer | Transflective |
| View Direction | 12 o'clock |
| Sunlight Readable | Yes |
| Backlight Color | Yellow-Green |
| Backlight Type | LED |
| Mode | Positive |
| Foreground Color | Dark |
| Background Color | Yellow-Green |
Electrical Specifications
| Supply Voltage for Logic Maximum | 5.5V |
| Module Connector Pitch | 2.54mm |
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 | Logic Level Serial, USB |
Part Change Notice
Subscribe to Part Change Notices by email 
or RSS 
Part Change Notice #10959: As part of our continuous improvement program, the CFA735 and CFA835 series displays are being revised.
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. |
Product Update #10607: Price change for CFA735 based parts, effective 2014-09-01
Product Update #10429: Hardware version update from 0vA to 1v0.
Part Change Notice #10404: WHQL Drivers for CFA735 family
Part Change Notice #10401: CFA735 family firmware 0vB
| Products Affected: | CFA735-TFK-KR, CFA735-TFK-KT, CFA735-TML-KR, CFA735-TML-KT, CFA735-YYK-KR, CFA735-YYK-KT |
| Date Issued: | February 3, 2012 |
| Summary: | CFA735 family firmware 0vB |
| Last revision: | 0vA |
| Description: | As part of our continuous improvement process, a new version of the CFA735 firmware is being released to address possible functional and performance issues. |
| Reason: | Corrects the RAM Layout for the STM32F103RC microcontroller. |
| Impact: | Low. |
| Recommendation: | We are recommending that all CFA735 modules be updated to 0vB firmware as soon as possible. NOTE: 0vB firmware requires 0vA hardware. See PCN 10400. |
| Availability: | CFA735 modules shipped from Crystalfontz America Inc, on or after 2012-02-06 |
| Price Change: | This firmware update does not effect the pricing of the CFA735 family. |
Part Change Notice #10400: CFA735 family hardware 0vA
| Products Affected: | CFA735-TFK-KR, CFA735-TFK-KT, CFA735-TML-KR, CFA735-TML-KT, CFA735-YYK-KR, CFA735-YYK-KT |
| Date Issued: | January 31, 2012 |
| Summary: | CFA735 family hardware 0vA |
| Last revision: | 0v9 |
| Description: | As part of our continuous improvement process, a new version of the CFA735 hardware is being released to address functional and performance issues. There is a supporting firmware revision for this hardware release. See PCN 10399. |
| Reason: | A 1MΩ 0603 resistor has been added at RC2 in support of fixing and extraneous byte received by the host when using the serial interface after a module reset. There is additional support for this fix in firmware 0vA. |
| Impact: | All CFA735 family modules are affected with this hardware update. |
| Recommendation: | All CFA735 modules that use the serial interface or GPIO lines should update to the new 0vA hardware and supporting firmware. If you require assistance loading the 0603 1MΩ resistor in RC2, please contact support@crystalfontz.com. |
| Availability: | Hardware 0vA and supporting firmware is shipping as standard release as of 2012/01/30. |
| Price Change: | No price change. |
Part Change Notice #10399: CFA735 family firmware 0vA
| Products Affected: | CFA735-TFK-KR, CFA735-TFK-KT, CFA735-TML-KR, CFA735-TML-KT, CFA735-YYK-KR, CFA735-YYK-KT |
| Date Issued: | January 31, 2012 |
| Summary: | CFA735 family firmware 0vA |
| Last revision: | 0v9 |
| Description: | As part of our continuous improvement process, a new version of the CFA735 firmware is being released to address functional and performance issues. There is a supporting hardware revision for this firmware release. See PCN 10400. |
| Reason: |
|
| Impact: | All CFA735 family modules are affected with this firmware update. Firmware version 0vA requires supporting hardware version 0vA. |
| Recommendation: | All CFA735 modules that use the serial interface or GPIO lines should update to the new 0vA firmware and supporting hardware. If you require assistance loading the 0603 1MΩ resistor in RC2, please contact support@crystalfontz.com. |
| Availability: | Firmware 0vA and supporting hardware is shipping as standard release as of 2012/01/30. |
| Price Change: | No price change. |
Product Update #10388: (New Product) CFA735-YYK-KR
Product Update #10377: CFA635 to CFA735 Migration
| Products Affected: | CFA635-YYE-KS, CFA635-TMF-KS, CFA635-TFE-KS, CFA635-TMF-KL, CFA635-TFE-KL, CFA635-TFE-KU, CFA635-YYE-KL, CFA635-TMF-KU, CFA635-YYE-KU, CFA735-TFK-KR, CFA735-TFK-KT, CFA735-TML-KR, CFA735-TML-KT, CFA735-YYK-KR, CFA735-YYK-KT |
| Date Issued: | January 3, 2012 |
| Summary: | CFA635 to CFA735 Migration |
| Description: | Detailed in formation on migrating from the CFA635 family to the CFA735 family of intelligent modules. The document covers the similarities and differences between the two family of modules. |
| Reason: | Support for the CFA735 product announcement. |
| Recommendation: | All CFA635 users should download and read the document. |
| Availability: | Q1 2012 – Initial run of CFA735 family available. Limited Quantities. Q2 2012 – Production level shipments of CFA735 family. Q3 2012 - CFA735 fully replaces CFA635. |
| Attachment: | CFA735_Migration_doc.pdf (734KB) |
Product Update #10376: Announcing CFA735 family of intelligent LCD modules with CFA635 emulation.
| New Products: | CFA735-TFK-KR, CFA735-TFK-KT, CFA735-TML-KR, CFA735-TML-KT, CFA735-YYK-KR, CFA735-YYK-KT |
| Date Issued: | January 3, 2012 |
| Summary: | Announcing CFA735 family of intelligent LCD modules with CFA635 emulation. |
| Description: | Crystalfontz America Inc. is proud to announce the release of the CFA735 family of intelligent modules. The CFA735 family represents the first of a new generation of our serial and USB interface modules as part of our continuous improvement process. Designed as an easy replacement for the CFA635 family of modules, the CFA735 family is a significant improvement in capability, capacity, flexibility and usability. The CFA735 family in CFA635 Emulation Mode has native support for simultaneous USB and Serial operation. There is an option to order the CFA735 with the CFA-RS-232-01 level inverter for full-swing RS-232 interfaces. The CFA735 family is available as a bare module, with your choice of internal / external USB cable, or with a serial cable kit (power, internal, and external connectivity). |
| Reason: | The CFA735 in CFA635 emulation mode is being released as a replacement for the CFA635 family of modules. The CFA635 family of modules has reached it's EOL. |
| Impact: | Customers migrating from the CFA635 family should place orders for engineering samples, and qualify as required by established procedures. |
| Availability: | The first run of the CFA735 family is available for immediate shipment in limited quantities. The initial release of the CFA735 family is CFA635 Emulation Mode. Our goal was to allow our customers that have integrated the CFA635 into their systems the ability to migrate to the CFA735 in CFA635 Emulation Mode with the least amount of interruption. Q1 2012 – Initial run of CFA735 family available. Limited Quantities. Q2 2012 – Production level shipments of CFA735 family. Q3 2012 - CFA735 fully replaces CFA635. |
| Price Change: | Please see the individual product pages for current pricing. |
| Attachment: | CFA735_Product_Announcement.pdf (2MB) |
For fan control and temperature sensing, use with:
For reference only. For design purposes, please use the specifications in the datasheet.
