CH9101R - USB-UART converter (QSOP16)

Description

The CH9101R is a USB to asynchronous UART serial bus converter integrated circuit designed for integration into electronic devices requiring USB to serial communication. The device operates as a full-speed USB device compliant with USB 2.0 and emulates a standard COM port, enabling direct interoperability with Windows systems using the built-in CDC driver or the proprietary VCP driver. Supported baud rates range from 50 bps to 3 Mbps, with full support for various data frame formats and MODEM control signals.

The CH9101R variant offers TXD, RXD pins, RTS, CTS, DTR, DCD, RI, and DSR signals, as well as TXS, RXS, TNOW, and SUSPEND auxiliary signals, enabling half-duplex and full-duplex communication, and RS485 transmitter control. The device features an internal oscillator, reset circuit, and EEPROM memory, allowing configuration of USB parameters such as VID, PID, and device description without the need for external clocking components. The CH9101R supports I/O logic power supply ranging from 1.8V to 5V, facilitating direct connection to microcontrollers with various voltage levels.

Features

• USB 2.0 Full Speed ​​Interface
• COM-compliant UART serial port emulation
• Baud rate range from 50 bps to 3 Mbps
• Supports 5, 6, 7, and 8 data bits and parity modes: none, even, odd, mark, and space
• Hardware support for MODEM RTS, CTS, DTR, DCD, RI, and DSR signals
• Automatic hardware RTS/CTS flow control
• TNOW output for controlling an RS485 transmitter
• VIO power supply ranges from 1.8 V to 5 V
• Built-in oscillator and reset circuitry, eliminating the need for a resonator
• Configurable EEPROM memory
• QSOP16 package