The CH340N is a compact USB-to-serial interface chip developed by WCH (Nanjing QinHeng Microelectronics), designed to facilitate communication between USB and UART interfaces. Encased in a space-saving SOP-8 package, it is ideal for applications requiring minimal PCB footprint.

Features :

• USB 2.0 Full-Speed Compliance: Operates at 12 Mbps, ensuring compatibility with USB 2.0 standards.
• Integrated Clock Oscillator: Eliminates the need for an external crystal oscillator, simplifying circuit design and reducing component count.
• Wide Baud Rate Support: Supports communication speeds ranging from 50 bps to 2 Mbps, accommodating various serial communication requirements.
• Voltage Flexibility: Operates with supply voltages from 3.0V to 5.5V, allowing integration with both 3.3V and 5V systems.
• Minimal External Components: Requires only a few external capacitors for operation, streamlining the design process.
• Driver Compatibility: Compatible with CH340/CH341 drivers, ensuring broad operating system support.

Specifications :

• Operating Voltage: 3.0V to 5.5V
• Operating Temperature Range: -20°C to +70°C
• USB Interface: Full-speed USB 2.0 compliant.
• UART Interface: Supports full-duplex communication with integrated transmit and receive buffers.
• Baud Rate: 50 bps to 2 Mbps.
• Package Type: SOP-8 (Small Outline Package)
• Dimensions: Approximately 4.9 mm × 6.0 mm × 1.5 mm

Applications :

• Microcontroller Communication: Facilitates USB connectivity for microcontrollers lacking native USB support.
• USB to TTL Converters: Used in USB to TTL serial converter modules for interfacing with serial devices.
• Embedded Systems: Ideal for space-constrained embedded applications requiring USB to serial communication.
• USB to RS232/RS485/RS422 Converters: With additional level-shifting circuitry, enables conversion to standard serial interfaces.

DataSheet : CH340N