CH9143 – BLE/UART/USB Three-Way Transceiver

CH9143 is a BLE/UART/USB transceiver (three-way bridge chip) from WCH (Nanjing Qinheng Microelectronics / Jiangsu Qin Heng). It enables transparent data transfer among Bluetooth Low Energy (BLE), USB, and UART interfaces.

• CH9143 – BLE / UART / USB Three-Way Transceiver
• CH9143 Features: BLE + UART + USB Bridge Chip
• WCH CH9143: Bluetooth, USB & Serial Data Bridge
• CH9143 Datasheet Summary – BLE/UART/USB Transceiver

CH9143 – BLE/UART/USB Three-Way Transceiver

Key Features

• Multi-interface data transfer: Bidirectional transparent transmission between BLE ↔ USB ↔ UART (any interface can forward data to the others).
• BLE support:
  • Modes: Slave, Master, and Master-Slave (combined).
  • BLE 4.2.
  • Configurable BLE communication and parameters in slave and master-slave modes.
  • Transmission distance up to ~100 m.
  • 8 adjustable TX power levels.
  • Supports connection from Windows / Linux / Android / iOS hosts.
  • Default broadcast name example (modules): CH9143BLE2U; passthrough service UUID typically 0xFFF0.
• UART:
  • Max baud rate: 1 Mbps.
  • AT command configuration.
  • Full MODEM signals: RTS, DTR, DCD, RI, DSR, CTS.
  • Data bits: 5/6/7/8; Stop bits: 1/2.
  • Parity: Odd, even, none, space (0), mark (1).
• USB:
  • Full-speed USB device interface (USB 2.0 compatible).
  • Two driver modes: Vendor driver or installation-free USB-CDC.
  • PC-side USB and BLE virtual serial port drivers provided (compatible with existing serial software/tools; no secondary development needed in most cases).
• Other:
  • Operating voltage: 2.5 V / 3.3 V.
  • 32 kHz clock source (optional external crystal).
  • Package: QFN28 (4 × 4 mm).
  • Online debug / data monitoring between USB, serial, and BLE.
  • Smart pairing support (with other CH914x devices in certain modes).

Typical Applications

• MCU/DSP/embedded systems
• Industrial instruments
• Smart home devices
• USB/serial wireless extension
• Debugging tools, dual-mode (USB + BLE) adapters, multi-interface redundancy

Official datasheet is available from WCH (CH9143DS1.PDF on wch.cn / wch-ic.com). Modules based on it (e.g., WeAct Studio boards) are also common for quick evaluation.