SMC2004A liquid crystal display module is a standard character dot matrix liquid crystal display module produced by SUNMAN, which can display 20 characters * 4 lines of Western characters, and the character size is 2.95X4.75(WXH) mm. It is equipped with HD44780 interface liquid crystal display controller, which can be directly connected with MCU single chip microcomputer, and is widely used in various instruments and electronic equipment.
This manual describes the SMC2004A liquid crystal display module, its main technical parameters, physical dimensions, and backlight characteristics. It includes the operating voltage range, temperature limits, and backlight voltage and current specifications.
The document also details the HD44780‑compatible controller interface, signal pin assignments, basic operation sequences, data pointer control, and the required initialization commands. Reference circuit diagrams for 8051‑based connections and backlight resistor values are provided. This manual is written in Chinese.
| Working temperature range | -20 °C to +70 °C |
|---|---|
| Storage temperature range | -20 °C to +70 °C |
| Module size | 98.0 mm × 93.0 mm |
The module contains an HD44780‑compatible controller (HP44780) built into the LCD.
Initialization is performed by writing a series of commands (e.g., 0x38) with short delays, as listed in the manual’s initialization steps.
The backlight operates at 4.2 V with an internal resistor of 5.1 Ω and an external resistor of 10 Ω, drawing about 80 nA; the current must not exceed 120 % of the rated value.