CH9120

Introduction to CH9120
CH9120 is a network communication module designed to enable serial-to-Ethernet or serial-to-Wi-Fi conversion, facilitating seamless data transmission between serial devices (e.g., RS232/RS485) and networks. It supports TCP/UDP protocols, static/dynamic IP configuration, and transparent transmission, making it ideal for industrial automation, IoT, and remote monitoring.
Key features include:
- Dual-mode support: Ethernet (10/100M) and Wi-Fi (802.11 b/g/n).
- Flexible protocols: TCP server/client, UDP, HTTP, etc.
- Easy configuration: Web-based or AT commands.
- Wide voltage range: 3.3V–5V DC, suitable for embedded systems.
CH9120 simplifies legacy device networking, offering reliability and low power consumption. Its compact design and compatibility with microcontrollers (e.g., Arduino, STM32) make it a versatile solution for modern connectivity needs.

The CH9120 is a network interface chip. Equivalent products include:
- W5500 (Hardware TCP/IP chip)
- ENC28J60 (Ethernet controller)
- DM9000 (Ethernet controller)
- LAN8720 (PHY chip, requires external MCU)
These alternatives offer similar Ethernet connectivity but may differ in features like protocol support, interface type, or required external components. Choose based on your project's needs.

The CH9120 is a versatile Ethernet-to-UART converter chip with these key features:
- Dual Communication Modes: Supports TCP Server/Client, UDP, or HTTP for flexible networking.
- Hardware Protocols: Integrates MAC+PHY, reducing external components.
- High-Speed UART: Baud rate up to 3 Mbps for fast data transfer.
- Multiple Config Methods: Configure via AT commands, Web Server, or Configuration Tool.
- Low Power: Operates at 3.3V with power-saving modes.
- Built-in Storage: Saves settings in non-volatile memory.
- Compact Package: Available in LQFP48 for space-constrained designs.
Ideal for IoT, industrial control, and serial device networking.

The CH9120 is manufactured by Jiangsu Qinheng Co., Ltd. (commonly known as WCH), a Chinese company specializing in integrated circuits (ICs) and communication chips.
WCH is a well-known manufacturer of cost-effective microcontrollers, USB interface chips, and Ethernet controllers, widely used in embedded systems and industrial applications. The CH9120 is an Ethernet-to-serial converter chip, enabling serial devices to connect to networks.
The company is recognized for its reliable, low-power solutions and strong presence in the domestic and global IC markets.

The CH9120 is a network interface chip primarily used for serial-to-Ethernet or serial-to-WiFi conversion. Key application areas include:
1. Industrial Control – Connects serial devices (PLC, sensors) to networks for remote monitoring.
2. IoT Devices – Enables wireless communication for smart home and embedded systems.
3. POS/Retail – Links serial printers or terminals to cloud/management systems.
4. Medical Equipment – Facilitates networked data transmission for diagnostic devices.
5. Security Systems – Integrates serial cameras/alarms into IP-based networks.
It simplifies legacy serial device networking with low power consumption and compact design.

The CH9120 is typically available in a QFN-32 package (5x5 mm). This compact, surface-mount design is suitable for high-density PCB layouts. It supports Ethernet and serial communication, making it ideal for embedded networking applications. The QFN package offers good thermal and electrical performance. Always refer to the datasheet for exact dimensions and pinout details.