The GU128x32D-7806A is a VFD module from Noritake Itron with a 128x32 dot graphic display function, which can display 2/3/4 x 16+ characters. It features a single 5V supply, a high-brightness blue-green display screen, a working temperature of -40°C to +85°C, 6 multi-sized fonts (Katakana/International) and 4/8-bit parallel LCD and serial interfaces.
This manual describes the features, electrical and optical specifications, and command set of the GU128x32D-7806A dot graphic VFD module. It covers power requirements, interface options (4‑/8‑bit parallel and asynchronous serial), and LCD‑compatible commands.
Detailed sections explain parallel and serial communication timing, extended graphic commands, port I/O configuration, and reset procedures, allowing developers to integrate the module into equipment with minimal hardware changes.
| Display Area | 54.89 x 13.93 mm |
|---|---|
| Dot Size / Pitch | 0.33 x 0.34 mm (horizontal) / 0.43 x 0.44 mm (vertical) |
| Luminance | 800 cd/m² (typ.) |
| Illumination Colour | Blue‑Green |
| Operating Temperature | -40 °C to +85 °C |
| Storage Temperature | -40 °C to +85 °C |
| Operating Humidity | 20 % to 80 % RH @ 25 °C |
| Power Supply Current | 250 mA (typ.) |
| Logic High Input (VIH) | 0.8 VDC min. |
| Logic High Output (VOH) | 3.5 VDC min. |
The module operates from –40 °C to +85 °C.
Brightness is set with the lum value in the command byte: 0xOOH for full brightness, 0x01H for 75 %, 0x02H for 50 %, and 0x03H for 25 %.
The module supports 4‑/8‑bit parallel LCD interfaces and asynchronous serial interfaces at TTL level.