The CH340C USB to TTL IC is a versatile USB bus converter chip that enables USB conversion to various serial interfaces, including standard serial, infrared (IrDA), and printer interfaces.

In serial interface mode, the CH340C provides common MODEM liaison signals, expanding computers’ asynchronous serial interface or directly converting standard serial devices to the USB bus.

With its full-speed USB device interface conforming to USB Specification Version 2.0, the CH340C only requires external crystal and capacitance components for operation. It emulates a standard serial interface, ensuring compatibility with serial application programs in Windows operating systems.

The CH340C features a hardware full-duplex serial interface with a transceiver buffer and supports communication baud rates ranging from 50bps to 2Mbps. It also supports common MODEM liaison signals such as RTS, DTR, DCD, RI, DSR, and CTS.

Additionally, the CH340C supports IrDA SIR infrared communication, with baud rates from 2400bps to 115200bps. It is compatible with 5V and 3.3V source voltages and comes in a lead-free SSOP-20 package, making it RoHS-compliant.

Overall, the CH340C USB to TTL IC offers a convenient and efficient solution for USB-to-serial conversion, providing compatibility with various serial interfaces and operating systems.