Product
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
- 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 128 temperature sensors and 32 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 Variations
Colors | Dark on Yellow-Green Yellow-Green LED BacklightDark on Light Gray White LED BacklightLight on Blue White LED Backlight |
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- square_foot Physical Characteristics
Physical Characteristics
Column Dots x Row Dots 244 x 68 Module Overall width height depth millimeters 142 38 20.8 inches 5.59 1.50 0.82 *depth doesn't include Keypad Diagonal Dimension 3.19" Viewing Area Width Height millimeters 83 27.5 inches 3.27 1.08 Active Area Width Height millimeters 77.97 22.38 inches 3.07 0.88 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 - visibility Optical Characteristics
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 - electric_bolt Electrical Specification
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 Module Connector Pitch 2.54mm - nature Environmental
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% - cable Electronics
Electronics
Interface Logic Level Serial, RS232, USB -
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Additional Resources
Product Note:
Currently Shipping: Hardware Version 2v0 Firmware Version 1v6
Part Change Notices
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Part Change Notice #11247: Keypad LED, H1 Header, Firmware, and Polarizer Change
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Product Update #11111: PCN 11097 is now in effect
Products Affected: CFA735-TFK-KR, CFA735-TFK-KT, CFA735-TML-KR, CFA735-TML-KT, CFA835-TML, CFA835-TFK Date Issued: January 17, 2022 Summary: PCN 11097 is now in effect Description: PCN 11097 has been completed and is now in effect. Please refer to PCN 11097 for more information. Please submit any questions to support@crystalfontz.com. - text_snippet
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. - text_snippet
Part Change Notice #11083: Firmware Update
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Part Change Notice #11068: Updating the hardware and firmware to accommodate a new LCD controller.
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Part Change Notice #11062: Firmware Update Available
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Product Update #11055: CFA835 Firmware Version 1.1 is now available. Firmware update to correct a USB data handling issue.
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Part Change Notice #10959: As part of our continuous improvement program, the CFA735 and CFA835 series displays are being revised.
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Part Change Notice #10669: CFA635, CFA735, and CFA835 displays with ATX (power on / off / reset) functionality enabled serial cable bundle change.
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Product Update #10582: (New Product) CFA835-TFK