244x68 Graphic LCD Display

Part Number: CFA835-TFK

The CFA835 family of modules are intelligent graphic LCDs. They offer an outstanding package: a display, six-button keypad, GPIOs, LEDs, multiple interface choices and memory in an attractive stainless-steel bezel. This powerful module is a great choice for a front panel or user interface display. Between the graphic display and four status LEDs, messages can be quickly and clearly communicated, and the fully decoded keypad allows for clear and robust inputs from the user.

The CFA835 has versatile and reliable packet-based communications with a set of 61 commands that simplify programming. The commands include tools to draw lines, rectangles, and circles. This means putting graphs, tables, and charts on your display is simple. For example, create a chart to display temperature fluctuations over time.

The entire USB LCD module only needs a single power supply. The buck-boost switching supply means the module can operate on a wide power supply voltage range from +3.3v to +5.0v, making it perfect for embedded systems.

This module was made for the demands of a commercial environment. Its wide operating temperature range means this module keeps going in temperatures between -20°C and +70°C.

The fully decoded 6-button keypad allows any combination of key presses to be valid and unique. The keypad is backlit and the large translucent silicone keys are responsive. Plus, a physical keypad reduces the chance of accidental incorrect touches.

The LCD backlight and contrast are adjustable. Both are fully voltage regulated over the power supply range. The LCD backlight comprises 12 LEDs edge lighting the LCD. The keypad LEDs are separately controllable.

The display on this module has a light background with dark blue font.

CFA835-TFK Features
  • 244 x 68 pixel backlit LCD
    • Light background with dark blue font
    • Edge-lit backlight with 12 LEDs, 6 per side
    • Grayscale graphic LCD controller
    • 12 o'clock viewing direction
  • 6 button backlit fully decoded keypad
  • 4 bi-color (red/green) LEDs
    • Separate switching LED brightness controllers for keypad and LCD backlights
  • Interfaces: USB 2.0, Logic-level Serial, RS232 Serial, I2C and SPI
    • Multiple simultaneous serial/SPI/I2C/CAN interfaces (depending on GPIO use)
    • Packet based communication with a 61-command set
  • Powerful and adaptable module for embedded systems
    • MicroSD card slot
    • Thirteen general purpose input/output pins (GPIOs)
    • Operating Temperatures: -20 to 70°
    • Buck-boost switching supply allows wide supply voltage range (3.3v to 5.0v)
    • STMicroelectronics STM32F401 microcontroller
    • ARM 32-bit Cortex™-M4 CPU @ 84 MHz
    • 256K Flash, 64K RAM
    • Run STM32 embedded applications on the CFA835 hardware using our open source firmware as a starting point
Options available after clicking "Customize and Add to Cart":
  • Cables for connecting to a variety of host systems
  • ATX power supply control functionality allows the buttons on the CFA835 to replace the "power" and "reset" buttons on host system, simplifying front panel design
  • System Cooling Accessory Board (FBSCAB) for controlling fans and reading temperature sensors (up to 256 temperature sensors and 64 fans)
  • SLED or drive bay bracket for mounting into a system

Not sure which LCD module to choose? Compare all of our intelligent display modules.

Product Variants


Logic Level Serial / RS232 / USB


I2C / Logic Level Serial / RS232 / SPI / USB

Add to cart without customizations
Qty:
Prices without customizations:
Quantity Price
1 * $117.45
10 * $110.10
20 * $101.82
50 * $95.49
100 * $89.17
200 * $88.12
500 * $86.96
1000 * $86.17
* Contact us about potential lead times.
Need a written quote? Add to cart, then enter your email address in the "request a quote" box.

Datasheet

CFA835 Datasheet
(Hardware 2.0, Firmware 1.6)
Previous Versions of Datasheets
CFA835 Datasheet
(Datasheet V 2020-12-01, Hardware 1.7, Firmware 1.5)
CFA835 Datasheet
(Datasheet V 2020-02-03, Hardware 1.3, Firmware 1.2)
CFA835 Datasheet
(Datasheet V 20191021, Hardware 1.3, Firmware 1.0)

Part Change Notices

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Video Demonstrations

CFA835 VU Meter Emulation Demonstration

CFA835 Graphic LCD emulating a VU meter


Raspberry PI CFA835 Integration Video

Integrate a Raspberry Pi with a CFA835


TECHNICAL SPECS

Physical Characteristics

Column Dots x Row Dots 244 x 68
Module Overall width height depth
millimeters 142 38 20.8
inches 5.591 1.496 0.819
*depth doesn't include Keypad
Viewing Area width height
millimeters 83 27.5
inches 3.268 1.083
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 55g
Keystroke Travel 2.4mm
Keypad Depth 12mm

Optical Characteristics

Glass Type/Glass Color FSTN/Light Gray
Polarizer Transflective
View Direction 12 o'clock
Sunlight Readable Yes
Backlight Color White
Backlight Type LED
Mode Positive
Foreground Color Dark
Background Color Light Gray

Electrical Specifications

Supply Voltage for Logic Minimum 3.3V
Supply Voltage for Logic Maximum 5.5V
Supply Voltage for Logic Typical 5V
Supply Current Minimum 50mA
Supply Current Maximum 267mA

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 I2C, Logic Level Serial, RS232, SPI, USB

Part Change Notice

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Part Change Notice #11097: Display Controller Change

Products Affected: CFA735-TFK-KR, CFA735-TFK-KT, CFA735-TML-KR, CFA735-TML-KT, CFA835-TML, CFA835-TFK
Date Issued: August 4, 2021
Summary: Display Controller Change
Description: The display controller, UC1611, is no longer available in the form of bonding on the PCB which is how Crystalfontz has used it for this design. We are designing a drop-in replacement that uses the UC1611 heat seal package, which will continue to be supported, instead of the PCB bonding package.

This component package change requires us to alter the PCB by moving some components around so that the heat seal tool can be used without causing damage to any components.

Availability of the current hardware version is very limited due to the ongoing worldwide chip shortage. Contact sales@crystalfontz.com for availability and to stay updated for a more accurate ship date.
Reason: UC1611 is no longer supported in the PCB bondable package.
Availability: Fourth-quarter of 2021. If you would like samples when it becomes available, please contact sales@crystalfontz.com.

Part Change Notice #11083: Firmware Update

Products Affected: CFA735-TFK-KR, CFA735-TFK-KT, CFA735-TML-KR, CFA735-TML-KT, CFA835-TML, CFA835-TFK
Date Issued: April 27, 2021
Summary: Firmware Update
Description: Manufacturing changes for internal process improvements and updating the build instructions so that the serial number is properly returned when using command h01.

Hardware Version Change: the hardware version is not changing
Firmware Version Change: the firmware version is not changing
Reason: The serial number was not being stored properly in the module's bootloader at the time of manufacturing.
Availability: The update will go into effect in May of 2021.

Part Change Notice #11068: Updating the hardware and firmware to accommodate a new LCD controller.

Products Affected: CFA735-TFK-KR, CFA735-TFK-KT, CFA735-TML-KR, CFA735-TML-KT, CFA835-TML, CFA835-TFK
Date Issued: October 12, 2020
Summary: Updating the hardware and firmware to accommodate a new LCD controller.
Description: These changes are being made to the hardware for both the CFA735TFK and TML variants and 835 TFK and TML variants of displays:
The hardware and firmware now support the new LCD controller
The hardware has an improved ADC circuit for GPIO5 and GPIO6

835 only:
The firmware has been updated with new features including Live Display, analog to digital interpretation on GPIO5 and GPIO6, closed loop temperature control. The new datasheets will have more information on these changes.
Reason: The LCD controller went end-of-life and a replacement is needed.
Impact: This is intended as a drop-in replacement. If the new features listed for the 835 are not wanted, a field upgrade kit that supports the new controller without the new features is available.
Recommendation: Request samples to validate the new version.
Availability: Available now.
Price Change: Price is subject to change.

Part Change Notice #11062: Firmware Update Available

Products Affected: CFA835-TML, CFA835-TFK
Date Issued: February 11, 2020
Summary: Firmware Update Available
Description: The firmware is being revised from v1.1 to v1.2
Reason: To correct an issue when the size of a font file on an SD card exceed the buffer size. The revised firmware will stop reading from the SD card until the buffer can accept the remainder of the file.
Impact: This issue only affected files with very large fonts
Recommendation: Customers who use large fonts should update to the latest firmware. It is recommended that any user who upgrades to the new firmware test the upgrade in their system before upgrading all modules.
Availability: The revised firmware is available now in a field upgrade kit.
https://www.crystalfontz.com/products/document/4216/835_firmware_1v2_field_upgradekit.zip
Price Change: N/A

Product Update #11055: CFA835 Firmware Version 1.1 is now available. Firmware update to correct a USB data handling issue.

Products Affected: CFA835-TML, CFA835-TFK
Date Issued: October 31, 2019
Summary: CFA835 Firmware Version 1.1 is now available.
Firmware update to correct a USB data handling issue.
Description: Fixed an issue with the USB data handling, primarily affecting the command 40 (0x28) subcommand 2 “Send Image Data to Display from Host.” Other USB data throughput improvements were also made.
Impact: The main effect of these changes is that command packets sent via USB may have slightly different reply times depending on the type of packet.

The firmware revision number has also incremented, as such the command 1 (0x01) “Get Module Information” will return “CFA835:hX.X:f1.1”
Availability: The firmware is available now. Upgrade information is included in the datasheet.

Part Change Notice #10959: As part of our continuous improvement program, the CFA735 and CFA835 series displays are being revised.

Products Affected: CFA735-TFK-KR, CFA735-TFK-KT, CFA735-TML-KR, CFA735-TML-KT, CFA735-YYK-KR, CFA735-YYK-KT, CFA835-TML, CFA835-TFK, CFA835-YYK
Date Issued: July 12, 2018
Summary: As part of our continuous improvement program, the CFA735 and CFA835 series displays are being revised.
Description: Components have been updated to ensure the long-term availability of the modules.

The LCD glass used has been changed to improve contrast.
Availability: Samples will be available in November 2018.
Last time buys of the current design may be made until January 2019.

Part Change Notice #10669: CFA635, CFA735, and CFA835 displays with ATX (power on / off / reset) functionality enabled serial cable bundle change.

Products Affected: CFA835-TML, CFA835-TFK, CFA835-YYK
Date Issued: July 29, 2015
Summary: CFA635, CFA735, and CFA835 displays with ATX (power on / off / reset) functionality enabled serial cable bundle change.
Description: As part of our continuous improvement process, CFA635 KS, CFA735 KT, and CFA835 display modules with the ATX (power on / off / reset) functionality enabled will have their RS-232 SERIAL cable bundle options changed from a serial cable and WRPWRY24 to a serial cable and a WRPWRY25. With TX (power on / off / reset) functionality enabled, additional
Reason: The WRPWRY24 is a power only cable and suitable for powering the CFA635, CFA735, and CFA835 when properly configured. When the displays are configured for ATX (power on / off / reset) functionality additional connections are necessary for proper operation. The WRPWRY25 offers the additional connections.
Impact: Full functionality will now be available as the part is shipped.
Availability: Immediate.
Price Change: There is no price change associated with this change.

Product Update #10582: (New Product) CFA835-TFK

New Product: CFA835-TFK
Date Issued: February 3, 2014
Summary: (New Product) CFA835-TFK
Description: Intelligent USB LCD Modules: USB+Serial Graphic LCD Module, Keypad, White LED Backlight, FSTN Positive, Transflective, -20°C to +70°C, 12:00.
For reference only. For design purposes, please use the specifications in the datasheet.