CH341A
USB-to-UART/SPI/I2C/Parallel converter with flexible interface options and EEPROM configuration
Product Overview
Description
CH341A is a versatile multi-protocol USB converter supporting UART, SPI, I2C, and parallel interfaces.
With EEPROM configuration and hardware flow control, this chip provides flexibility for complex embedded applications.
The chip is ideal for applications requiring multiple interface types or upgrading legacy parallel devices to USB.
Product Series
CH
Primary Application
Multi-protocol adapters
Key Features
- Multi-protocol support: UART/SPI/I2C/Parallel
- USB 2.0 Full Speed compliant
- Built-in clock oscillator
- EEPROM for configuration storage
- Hardware flow control
- 5V and 3.3V IO support
- Flexible interface selection
- WHQL certified drivers
Specifications
| Interface | USB 2.0 Full Speed to UART/SPI/I2C/Parallel |
|---|---|
| Baud Rate | 50bps to 2Mbps (UART) |
| IO Voltage | 5V or 3.3V (selectable) |
| USB Speed | Full Speed (12Mbps) |
| SPI Speed | Up to 5MHz |
| I2C Speed | Standard and Fast mode |
| Clock Source | Built-in oscillator |
| Temperature Range | -40°C to +85°C |
| Package | SOP-28, SSOP-20 |
Applications
Multi-protocol adapters
Electronic system design
Legacy parallel port conversion
Power conversion and supply
SPI Flash programmers
Electronic system design
I2C device communication
Communication and interface
Industrial control interfaces
Industrial automation and control
Test equipment
Electronic system design
FAE Expert Insights
"CH341A is incredibly versatile for applications needing multiple interface types. I've used it in universal programmers that need to support SPI Flash, I2C EEPROM, and UART devices. The EEPROM configuration allows the chip to remember settings between power cycles. One consideration: the SPI speed is limited to 5MHz, so it's not suitable for high-speed Flash programming. For those applications, use CH347 instead. The parallel interface mode is useful for upgrading legacy LPT devices to USB."
Multi-protocol flexibility in a single chip
— Michael Zhang, BeiLuo