DB9 Serial to USB HID Multi-Protocol USB Keyboard Mouse Emulation Programmable Baud rate adjustable

Product Description:
The CH9329 is a versatile USB-to-serial protocol converter IC designed to simplify USB HID (Human Interface Device) integration in embedded systems. It enables seamless communication between serial devices (MCUs, PCs, etc.) and USB hosts, supporting keyboard, mouse, and custom HID device emulation with robust configurability.

Key Features:

• Multi-Communication Modes:
  • Protocol Mode (Default): Frame-based command control for precise USB HID operations.
  • ASCII Mode: Simplified text-to-USB keypress translation.
  • Pass-Through Mode: Direct data transfer for custom HID applications.
• USB HID Emulation:
  • Keyboard: Full key combinations, multimedia keys (volume, play/pause), and LED status feedback.
  • Mouse: Absolute (4096×4096 resolution) and relative cursor control with scroll wheel support.
  • Custom HID: Bidirectional data transfer for specialized devices (up to 64-byte packets).
• Flexible Configuration:
  • Adjustable baud rate (up to 2Mbps), address filtering, VID/PID customization, and string descriptors.
  • Hardware/software mode switching and factory reset capability.
• Robust Integration:
  • Master-slave communication with error detection (CRC checksum) and auto-retry.
  • Supports Windows/Linux/Android/macOS and USB 2.0 full-speed compatibility.
• Applications:
  Ideal for POS systems, industrial controllers, smart home devices, medical equipment, and DIY projects requiring USB HID emulation.