Selection guide for RuiNeng RN721X, RN7302 and RN820X measurement chips with features, pinouts and electrical specs.
The guide provides an overview of three measurement‑SOC families from RuiNeng: the RN721X single‑phase SOC, the RN7302 three‑phase meter chip and the RN820X single‑phase meter chip. Each section includes an introduction, key features, system block diagram, pin assignment and electrical characteristics.
Detailed specifications such as flash size, ADC channels, operating voltage range, measurement accuracy and typical application circuits are listed, helping designers choose the appropriate chip for smart electric‑meter designs. This manual is written in Chinese.
| Flash memory | 128 KB |
|---|---|
| EEPROM memory | 32 KB |
| RAM | 16 KB |
| CPU maximum frequency | 29.4912 MHz |
| Supply voltage range | 2.8 V ~ 5.5 V |
| Active energy measurement error | ±0.1 % |
| Frequency measurement error | ±0.02 % |
| UART interfaces | 5 ports |
The RN721X operates from 2.8 V to 5.5 V.
The chip provides five UART ports.
Active energy measurement error is ±0.1 % over an 8000:1 dynamic range.
The flash memory size is 128 KB.