WR3 Module

WR3 is a low power embedded Wi-Fi module developed by Tuya Smart.

Scope of application

This topic describes relevant information about WR3 module during MCU connection development.

WR3 is a low power embedded Wi-Fi module developed by Tuya Smart. The module consists of a highly integrated radio-frequency identification (RFID) chip RTL8710BN and an external flash chip, with a built-in Wi-Fi network protocol stack and various library functions. WR3 also has low-power ARM CM4F, WLAN MAC, and 1T1R WLAN. The highest basic frequency is 125 MHz. The module has 256 KB built-in static random access memory (SRAM), 2 MB flash, and numerous peripheral resources. As a real time operating system (RTOS) platform, WR3 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 WR3 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 continuous emission status, the maximum current is 428 mA. It is recommended that the supply current of the module should exceed 500 mA, and the total capacity of the external filter capacitor should exceed 10 uF.
  • In the PCB layout, filter capacitor at the power input pin shall be arranged near the power supply pin.

• Module pin:

  • There are no special pins. For more information, see WR3 Module Datasheet.

• Radio frequency (RF) of the module:

  • The module only supports PCB onboard antennas.

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