244x68 Graphic LCD Display

Part Number: CFA835-TFK

Pricing

Quantity Price ea.
1 $101.25
10 $98.30
20 $92.56
50 $86.81
100 $81.06
200 $75.32
500 $69.57
1000 * $63.83
* Contact us about potential lead times.
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Datasheet

CFA835 Datasheet
(Datasheet V 2020-02-03, Hardware 1.3, Firmware 1.2)

Part Change Notices

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Product Variants


Logic Level Serial / RS232 / USB

Description

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

CFA835-TFK Features
  • STMicroelectronics STM32F401 microcontroller
  • ARM 32-bit Cortex™-M4 CPU @ 84 MHz
  • 256K Flash, 64K RAM
  • 244x68 pixel backlit LCD
  • Sitronix ST7529 32 grayscale graphic LCD controller
  • Buck-boost switching supply allows wide supply voltage range (3.3v to 5.0v)
  • CFA10052 Crystalfontz custom hardware
  • Separate switching LED brightness controllers for keypad and LCD backlights
  • 6 button backlit fully decoded keypad
  • 4 bi-color (red/green) LEDs
  • USB, RS232, Logic Level Serial interface
    • Multiple serial/SPI/I2C/CAN interfaces (depending on GPIO use)
  • Packet based communication with a 61-command set
    • Command include tools to draw lines, rectangles, and circles
  • 12 o'clock viewing angle
  • microSD card slot
  • Up to 20 general purpose IO pins (GPIOs)
  • Operating Temperatures: -20 to 70°
  • Edge-lit backlight with 12 LEDs, 6 per side
  • Add one of two types of mountings brackets
  • Add CFA-FBSCABs to customize your order for temperature sensing and fan controls (up to 256 temperature sensors and 64 fans)

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. It's 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.

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.

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 Logic Level Serial, RS232, USB

Part Change Notice

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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.