The CH9102X is a high-speed USB-to-UART bridge IC developed by WCH (Jiangsu Qinheng Microelectronics). It enables seamless communication between a USB host and UART-based embedded systems, making it ideal for programming, debugging, firmware updates, and serial data communication. The device integrates a USB 2.0 Full-Speed interface, an internal clock, power-on reset, and firmware, eliminating the need for an external crystal oscillator. The CH9102X variant supports 3.3 V UART I/O and is widely used on development boards such as ESP32 and other MCU-based designs.
Key Features
USB 2.0 Full-Speed (12 Mbps) compliant device interface
USB-to-UART bridge supporting baud rates from 50 bps to 4 Mbps
3.3 V UART I/O (CH9102X variant)
Integrated clock oscillator (no external crystal required)
Built-in power-on reset circuit
Hardware full-duplex UART with independent TX/RX buffers
Supports 5, 6, 7, or 8 data bits
Supports None, Odd, Even, Mark, and Space parity
Supports RTS/CTS hardware flow control
Supports MODEM signals: RTS, CTS, DTR, DSR, DCD, and RI
TNOW output for automatic RS-485 transmit/receive control
Compatible with built-in CDC drivers and vendor VCP drivers on major operating systems
Available in compact RoHS-compliant QFN packages
#CH9102X #USBtoUART #USBBridge #UART #SerialConverter #WCH #USB20 #EmbeddedSystems #ESP32 #MCU #RS485 #FirmwareUpdate #Debugging #IoT #PCBDesign
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