CH343P

CH343 is a USB bus converter chip that implements USB-to-high-speed asynchronous serial port conversion and provides common MODEM handshake signals. It is used to expand asynchronous serial ports for computers, or to directly upgrade ordinary serial port devices or MCUs to USB bus.

Applications

• USB to TTL Serial
• USB to RS232 Serial
• USB to RS485
• Serial Device Firmware Upgrade

Key features

• Full-speed USB device interface, compatible with USB V2.0.
• Built-in firmware emulating a standard serial port, enabling upgrade of existing serial peripheral devices or addition of extra serial ports via USB.
• Fully compatible with serial port applications under Windows OS on the host PC — no modification required.
• Supports driver-free OS built-in CDC class drivers or high-speed multi-function VCP vendor drivers.
• Hardware full-duplex serial port with independent TX/RX buffers; supports baud rates from 50bps to 6Mbps.
• Serial port supports 5, 6, 7, or 8 data bits; supports odd, even, space, mark, and no parity.
• Supports commonly used MODEM control signals: RTS, DTR, DCD, RI, DSR, CTS.
• Supports CTS and RTS hardware automatic flow control.
• Supports half-duplex mode; provides TNOW transmit-active status signal for RS485 direction switching.
• Supports RS232 interface via external level-shifting devices.
• USB side supports 5V and 3.3V supply voltage.
• Serial port I/O independently powered; supports 5V, 3.3V, 2.5V, and 1.8V supply voltages with reverse-current protection.
• Built-in power-on reset and internal clock; no external crystal required.
• CH343P features built-in EEPROM for configuring VID, PID, maximum current, vendor and product information strings, and other parameters.
• Built-in Unique ID (USB serial number).
• Available in SOP16, ESSOP10, and QFN16 lead-free packages, RoHS compliant.