Ch340 Datasheet (I) 1 usb to Serial Port Chip ch340

Document Outline

• 1. Introduction
• 2. Features
• 3. Packages
• 4. Pin definitions
• 5. Function descriptions
  • 5.1. Clock, reset, power, connect
  • 5.2. Configuration information of CH340B
  • 5.3. DTR and multi-mode MCU download
  • 5.4. UART features
• 6. Parameters
  • 6.1. Absolute maximum ratings
  • 6.2. Electrical characteristics (5V)
  • 6.3. Electrical characteristics (3.3V)
  • 6.4. Timing parameters
• 7. Applications
  • 7.1. USB to 9-line RS232 UART
  • 7.2. USB to 3-line RS232 UART
  • 7.3. USB to RS232 UART, simplified version
  • 7.4. USB to RS485 UART
  • 7.5. USB to Infrared adapter
  • 7.6. Connect to MCU and supply power together
  • 7.7. Connect to MCU and supply power separately, avoiding bi-directional current poured backwards
  • 7.8. Connect to MCU and supply power separately, avoiding inward current poured backwards
  • 7.9. One-click USB download of MCU