ST Sitronix ST7920 is a liquid crystal display driver chip with 8-bit, 4-bit and serial micro-processor control interfaces. It can display letters, numbers, Chinese characters and custom block displays. The chip has low power consumption (2.7V to 5.5V) and can provide power saving needs for battery-powered portable products.
The ST7920 is a low‑power LCD controller that supports 16×2 character displays and multiple interface modes (8‑bit, 4‑bit and serial). It includes built‑in character ROMs for Chinese and Latin characters, graphic RAM, and icon RAM, allowing flexible display configurations.
The document provides detailed pin assignments, electrical specifications, and functional descriptions such as power‑up reset, segment control, and timing options, enabling designers to integrate the controller into battery‑operated or low‑power devices. This manual is written in Chinese.
| Supply voltage | 2.7 V to 5.5 V |
|---|---|
| Maximum operating frequency | 2 MHz (when Vep = 5 V) |
| Display size | 16×2 characters |
| Chinese character ROM | 8192 characters (16×16) |
| Latin character ROM | 128 characters (16×8) |
| Icon RAM size | 256 bytes |
The controller operates from 2.7 V up to 5.5 V.
The built‑in ROM contains 8192 Chinese characters of 16×16 size.
It supports three interface modes: 8‑bit parallel, 4‑bit parallel, and serial, selectable via the PSB pin.
The controller can run up to 2 MHz when Vep is 5 V.