CH347
USB to SPI/I2C/UART/GPIO bridge with high-speed operation Ideal for industrial and consumer applications with excellent performance and reliability.
Product Overview
Description
CH347 is a flexible USB bridge chip supporting multiple serial protocols through a single USB interface.
With SPI up to 30MHz, I2C up to 1MHz, and UART up to 3Mbps, this chip is ideal for development tools and test equipment.
The chip provides GPIO pins for additional control and status monitoring.
Product Series
CH
Primary Application
Development tools
Key Features
- Multi-protocol support (SPI/I2C/UART)
- High-speed SPI up to 30MHz
- Flexible GPIO pins
- USB 2.0 Full Speed
- Virtual COM port support
- DLL API for direct access
- Multiple interfaces simultaneously
- Low cost
Specifications
| USB | USB 2.0 Full Speed |
|---|---|
| SPI | Up to 30MHz |
| I2C | Up to 1MHz |
| UART | Up to 3Mbps |
| GPIO | Up to 8 |
| Package | QSOP28, SSOP20 |
Applications
Development tools
Electronic system design
Test equipment
Electronic system design
Production programmers
Electronic system design
Multi-protocol adapters
Electronic system design
Embedded debugging
Electronic system design
FAE Expert Insights
"CH347 is perfect for development tools requiring multiple protocols. I use it in a universal programmer that supports SPI Flash, I2C EEPROM, and UART devices. The 30MHz SPI speed handles high-speed Flash programming. The unified USB interface simplifies the design compared to using multiple converter chips. The DLL API provides fine control over timing for picky devices. Highly recommended for tool developers."
Single chip replaces multiple converters
— Kevin Wang, BeiLuo
Frequently Asked Questions
Can CH347 operate all interfaces simultaneously?
Yes, CH347 can operate SPI, I2C, and UART interfaces simultaneously through the USB interface. The chip multiplexes data over USB. Each interface has independent configuration and buffering. Total USB bandwidth is shared among active interfaces. For high-throughput applications, consider the aggregate data rate.
All interfaces can be active simultaneously. Monitor total bandwidth for high-throughput applications. Contact our FAE team for multi-interface configuration.