The Sitronix ST7920 LCD controller/driver specification details its 8‑bit, 4‑bit and serial MPU interfaces, display RAM, power modes and pin functions.
The ST7920 is a dot‑matrix LCD controller/driver that supports 8‑bit, 4‑bit and serial MPU interfaces. It integrates display RAM, character generator ROMs, graphic RAM and built‑in power‑saving features in a single chip, making it suitable for battery‑operated portable products.
The document provides electrical characteristics, pin‑out diagrams, timing diagrams, and application circuits. It describes the power‑supply range (2.7 V‑5.5 V), low‑power modes, built‑in booster circuit, and the LCD segment/common configuration (33‑common × 64‑segment). Detailed pad layout and function tables enable designers to connect the device correctly.
| Supply voltage range | 2.7 V to 5.5 V |
|---|---|
| Interface types | 8‑bit, 4‑bit and serial MPU |
| Character RAM (DDRAM) size | 64 × 16 bits (max 16 × 4 characters) |
| Graphic RAM (GDRAM) size | 64 × 256 bits |
| Character ROM (CGROM) capacity | 8192 characters, 16 × 16 dot matrix |
| Power consumption (Normal mode) | 450 µA @ 5 V |
| Power consumption (Standby mode) | 30 µA max @ 5 V |
| Power consumption (Sleep mode) | 3 µA max @ 5 V |
The device operates from 2.7 V up to 5.5 V.
The CGROM stores 8192 characters, each 16 × 16 dots.
Normal mode draws 450 µA, standby 30 µA, and sleep 3 µA at 5 V.