WBR3D Module

WBR3D is a low power embedded Wi-Fi and Bluetooth LE combo module developed by Tuya Smart.

Scope of application

This topic describes relevant information about WBR3D module during MCU connection development.

WBR3D is a low power embedded Wi-Fi and Bluetooth LE combo module developed by Tuya Smart. The module consists of a highly integrated radio-frequency identification (RFID) chip RTL8720DN and a few peripheral components, with a built-in Wi-Fi network protocol stack and various library functions. WBR3D also has a low power 32-bit CPU, 512 KB static random access memory (SRAM), 4MB external flash, and rich peripheral resources.

As a real time operating system (RTOS) platform, WBR3D integrates all function libraries of Wi-Fi MAC and TCP/IP protocols. You can develop your own embedded Wi-Fi products.

For more information, see WBR3D Module Datasheet.

Typical application diagram

• Reference diagram of coordinated processing mode of the module and 3.3 V MCU:

  

• Reference diagram of coordinated processing mode of the module and 5 V MCU:

  

Design specification

• Module power supply:

  • When the module is in the working mode, the maximum transient current reaches 392 mA. It is recommended that the supply current of the 3.3 V module should exceed 450 mA.
  • In the PCB layout, capacitors C1 and C2 at the power input pin shall be arranged near the power supply pin. The capacitance shall exceed 10 uF.

• Module pin: RST pin only resets the module hardware, but cannot clear Wi-Fi network configuration information.

  • The ADC port cannot be used as an ordinary I/O port. When not in use, the pin can float. As the ADC input port, the input voltage ranges from 0 V to 1.0 V.
  • UART0 is the user serial port. When the module is powered on, the serial port outputs the information, which can be ignored by the user.

• Radio frequency (RF) of the module:

  • The module has a PCB onboard antenna.

  • When a PCB onboard antenna is used in the Wi-Fi module, it is recommended that the distance between the module antenna and other metal parts should be at least 15 mm, in order to optimize the Wi-Fi performance. Wiring and copper pour are not allowed in the antenna area of the PCB, in order not to affect the antenna performance. Key points of layout:

    • Make sure that there is no substrate medium directly below or directly above the printed antenna.
    • Make sure that the printed antenna is away from the copper sheet. In this way, the antenna radiation effect is guaranteed to the maximum extent.