The SPI to Quad UART TTL Converter Module CH9434M is designed to expand the serial communication capabilities of microcontrollers and embedded systems. It offers four full-duplex asynchronous TTL UART interfaces, each compatible with the 16C550 standard. With support for high-speed communication up to 4 Mbps, this module also includes features like independent FIFO buffers, baud rate flexibility, and built-in support for common modem control signals.

Features:

• Working Voltage: 3.3V.
• Baud Rate Support: Configurable baud rate range from 1200 to 40,000,000 bps.
• Independent FIFO Buffers: Each UART has separate transmit (1536 bytes) and receive (2048 bytes) FIFO buffers.
• Four Independent UARTs: Fully independent, enhanced 16C550-compatible asynchronous UART interfaces.
• Data Format: Supports 5, 6, 7, or 8 data bits and 1 or 2 stop bits.
• Parity Support: Supports odd, even, none, space (0), and mark (1) parity modes.
• Modem Signals: Supports RTS, DTR, DCD, RI, DSR, and CTTS modem control signals.
• Half-Duplex RS485: Includes half-duplex RS485 transmit/receive enable pin.
• SPI Speed: Supports SPI communication speeds up to 32 Mbit/s.

Applications:

• Microcontroller and Embedded Systems: Expands the serial communication interfaces for embedded projects.
• Data Acquisition: Ideal for applications requiring multiple UART interfaces for communication with sensors, peripherals, and other devices.
• RS485 Communication: Suitable for industrial automation systems and long-distance communication using RS485 half-duplex mode.
• Serial Port Expansion: Perfect for situations where more than one serial port is needed on a system with limited UART ports.
• Modem and Communication Systems: Useful for connecting and managing multiple modems and serial communication devices.