CH9350L Dual USB Master to MCU Serial interface.

The CH9350 Dual Master USB to Serial Converter is a sophisticated communication bridge designed to simplify data exchange between USB devices and serial interfaces. Based on the CH9350L microcontroller from WCH (Nanjing Qinheng Microelectronics), this versatile chip enables seamless connectivity for hobbyists, educators, and professionals working on embedded systems, industrial automation, and custom interface solutions. Its dual master capability makes it particularly well-suited for applications requiring simultaneous USB host and device functionality.

Key Features:

• Dual Master Architecture: Supports both USB host and USB device modes simultaneously, enabling flexible connectivity options.
• Multiple Serial Interfaces: Provides UART, SPI, and I2C communication protocols for broad compatibility with peripheral devices.
• Plug-and-Play Operation: No external firmware development required for standard USB-to-serial conversion applications.
• Compact LQFP48 Package: Space-efficient 48-pin surface-mount package (approximately 7mm x 7mm) suitable for integration into dense PCB layouts.
• USB 2.0 Full-Speed Support: Operates at up to 12 Mbps for reliable data transfer rates.
• Wide Voltage Range: Operates from 3.3V to 5V, accommodating various system power requirements.
• Part Number: CH9350L (as marked on the IC: "CH9350L" and date code "1504765819").
• Built-in USB Protocol Handling: Hardware-level USB enumeration and data packet management reduces host processor overhead.
• UART Baud Rates: Supports standard baud rates from 300 bps up to 2 Mbps for serial communication.
• Integrated Clock Generation: On-chip oscillator eliminates the need for external crystal components in many applications.
• GPIO Pins: Multiple general-purpose I/O pins available for control signals and status indication.
• ESD Protection: Built-in electrostatic discharge protection on USB pins enhances reliability in industrial environments.
• Low Power Modes: Sleep and suspend modes reduce power consumption in battery-operated applications.
• Temperature Range: Industrial-grade operating temperature range suitable for demanding environments.
• RoHS Compliant: Lead-free package meets environmental standards for modern electronics manufacturing.

Applications

• USB-to-Serial Adapters: Create custom USB-to-UART, USB-to-SPI, or USB-to-I2C converter devices for debugging and development.
• Industrial Automation: Interface legacy serial equipment with modern USB-enabled control systems and computers.
• Embedded System Development: Simplify communication between development boards and host PCs for programming and data logging.
• Custom HID Devices: Design bespoke human interface devices such as barcode scanners, card readers, and custom input peripherals.
• Educational Projects: Teach students about USB protocols, serial communication, and hardware-software integration.

Why Choose the CH9350 Dual Master USB to Serial Converter? The CH9350L combines powerful dual master USB functionality with versatile serial interfaces in a single, cost-effective package. Its hardware-managed USB protocols and flexible communication options make it an excellent choice for developers seeking to bridge the gap between USB and traditional serial devices without the complexity of extensive firmware development. Whether you're upgrading legacy equipment or creating cutting-edge custom interfaces, the CH9350 delivers reliable performance and simplified integration.