UIF-420A (LCD + 23 Key)

Need a simple and effective user interface without the overhead of graphics or touch screens? The UIF Series provides a practical solution by combining a character LCD and keypad input into a single, dedicated module. It is ideal for applications where reliability, clarity, and ease of implementation are more important than advanced visual effects.

For projects that do not require complex graphics, the UIF Series offers a clean and efficient alternative. By integrating the LCD display and keypad into one device, system complexity is reduced, wiring is simplified, and development time is shortened. This makes the UIF Series well suited for industrial controllers, embedded systems, and cost-sensitive applications.

Text data can be displayed on the LCD via RS232C, SPI, or I²C (CuNET), and key input data is transmitted back to the host system as key codes. Handling both display output and key input through standard communication interfaces allows flexible system integration while keeping firmware design straightforward.

• Key input data transmitted via SPI or RS232 protocol
• Built-in 20 × 4 character LCD (supports I²C / SPI / RS232 display control)
• Software-controlled LCD backlight ON/OFF
• Four (4) on/off status LEDs
• Programmable buzzer with millisecond-level control
• Key buzzer sound ON/OFF feature
• Key status and individual key values can be monitored
• Selectable RS232C baud rate from 4,800 to 115,200 bps
• Selectable CuNET (I²C) address range: 0 to 7
• Dimensions (W × H × D): 7.87 × 4.33 × 1.34 inches

 FAQ

Q: Do I need to program this device?
A: No programming is required on this device itself.
This product is simply an LCD display with a keypad — it does not have a built-in controller. You connect it to an external controller such as an MCU or an Arduino. When the controller sends data via RS-232, the text appears on the LCD. When a key is pressed, the keypad sends a corresponding code back to the controller. In short, the controller handles all the logic, and this module works purely as an input/output interface.

Dimension