CH347

Part: CH347 (WCH)

Type: High-Speed USB Bridge Chip

Description: The CH347 is a high-speed USB bus bridge chip that provides asynchronous serial ports, I2C synchronous serial interfaces, SPI synchronous serial interfaces, JTAG interfaces, and SWD interfaces via the USB bus.

Operating Conditions:

• Supply voltage: 3.3V (VCC); CH347F I/O power supply (VIO) supports 1.8V, 2.5V, 3.3V
• Operating temperature: Not explicitly stated
• USB speed: 480Mbps
• Serial port baud rate: 1200bps to 9Mbps
• I2C transmission frequency: Up to 1MHz
• SPI transmission frequency: Up to 60MHz

Absolute Maximum Ratings:

• Not explicitly stated in the provided text.

Key Specs:

• USB device interface speed: 480Mbps
• Serial port baud rate range: 1200bps to 9Mbps
• Serial port receive FIFO size: 12KB
• Serial port transmit FIFO size: 4KB
• I2C transmission frequency: Up to 1MHz
• SPI transmission frequency: Up to 60MHz
• Reset delay after power-on (tRSTD): 15 mS (Min), 28 mS (Typ), 40 mS (Max)
• USB auto-suspend detection time (tSUSP): 3 mS (Min), 5 mS (Typ), 9 mS (Max)

Features:

• Built-in EEPROM for configurable operating mode, VID, PID, max current, manufacturer/product strings.
• Single 3.3V power supply.
• CH347F supports independent I/O power supply (3.3V, 2.5V, 1.8V).
• Provides 2 high-speed serial ports.
• Supports RS485 serial port transmit/receive enable control.
• Supports hardware flow control (CTS, RTS).
• Supports common MODEM handshake signals.
• Supports up to 8-channel GPIO input/output functions.
• Provides 1 2-wire I2C interface (Host/Master mode).
• Provides 1 4-wire SPI interface (Host/Master mode).
• SPI supports 2 chip select signal lines.
• SPI supports 8-bit/16-bit data structure, MSB/LSB transmission, modes 0/1/2/3.
• SPI supports hardware DMA transmit and receive.
• Provides 1 JTAG interface (Host/Master mode).
• Provides 1 SWD interface (Host/Master mode).

Applications:

• Expand asynchronous serial ports for computers.
• Upgrade ordinary serial devices or MCUs to the USB bus.
• Expand 2-wire or 4-wire synchronous serial interfaces for computers (e.g., EEPROM, FLASH, sensors).
• Expand JTAG interfaces for computers (e.g., CPU, DSP, FPGA, CPLD).
• Expand SWD interfaces for computers (e.g., ARM MCUs, CPUs).

Package:

• QFN28 (4x4mm)
• TSSOP20 (4.4x6.5mm)

Note: Dimensions are in mm (millimeters).

Pin center spacing is a nominal value with no error; other dimensions have an error no greater than ±0.2mm.