【Driver-Free HID Operation】 Supports keyboard, mouse, and custom HID modes; no drivers required for Windows Linux macOS Android systems; compatible with USB 2.0 full speed protocol
【Wide Voltage Compatibility】 Operates on 3.3V to 5.5V power supply; supports 3.3V TTL logic level with 5V input compatibility; Suitable for embedded and IoT applications
【High Baud Rate Communication】 Supports 300bps to 115200bps serial communication; error rate less than 2% with automatic baud rate detection; suitable for data scanning and automation scripts
【Low Power Standby Mode】 Consumes less than 1mA in sleep mode; 16-byte FIFO data buffer prevents data loss; designed for energy-efficient and long-term operation
【Easy Integration with Development Boards】 Compatible with for Arduino for Raspberry Pi and STM32 platforms; provides transparent transmission ASCII and protocol modes for flexible application development

Product Parameters Parameters

Operating Voltage: 3.3V-5.5V DC (3.3V/5V System Compatible)

USB Protocol: USB 2.0 Full Speed (12Mbps), HID Class Compliant

UART Baud Rate: 300bps–115200bps (±2% Error, Auto-Detect Support)

Logic Level: 3.3V TTL (5V Tolerant)

HID Modes: Keyboard/Mouse/Custom HID (4 Modes Configurable)

Interface: UART/TTL (Default 9600bps)

Package: SOP-16 (Industrial Compact Design)

Operating Temperature: -40°C to +85°C

Data Buffer: 16-Byte FIFO (Prevents Data Loss)

Standby Current:
Pin Functions ( )

VCC: Power Input (3.3V-5.5V DC, Max 100mA).

GND: Power Ground (Common with System).

TXD: UART Transmitter (Connect to Target Device RXD).

RXD: UART Receiver (Connect to Target Device TXD).

D+: USB Data Positive (Direct to Computer USB Port).

D-: USB Data Negative (Direct to Computer USB Port).

ACT#: Status Indicator (Low = USB Connected, Optional LED).

FAQ

1.
Q: Computer not recognizing USB device?

→ Check D+/D- wiring; install official CH341 driver; disable driver signature enforcement (Win10/11).

2.
Q: Keyboard input delay/key loss?

→ Ensure baud rate match (default 9600bps); add >10ms between serial data; avoid repeated key values (use protocol mode).

3.
Q: Mouse movement not smooth?

→ Use absolute mouse mode (CH9329F variant); switch to touchscreen mode on Linux for compatibility.

4.
Q: Custom HID data error?

→ In transparent mode, ensure packets ≤64 bytes; verify checksum in protocol mode.

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