WR3E Module

WR3E is a low power embedded Wi-Fi module developed by Tuya Smart.

Scope of application

This topic describes relevant information about WR3E module during MCU connection development.

WR3E 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 extended flash chip, with a built-in Wi-Fi network protocol stack and various library functions. WR3E 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, WR3E 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 WR3E Module Datasheet.

Typical application diagram

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

  

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

  

Design specification

• Module power supply:

  • During continuous emission of the module’s TX, the maximum current is 295 mA. It is recommended that the supply current of 3.3 V module should exceed 400 mA, and the total capacity of the external filter capacitor should exceed 10 uF.
  • In the PCB layout, the power 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 the module datasheet.

• 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.