WR2 Module

Scope of application

This topic describes relevant information about WR2 module during MCU connection development.

WR2 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 built-in Wi-Fi network protocol stack and various library functions. WR2 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, WR2 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 WR2 Module Datasheet.

Typical application diagram

Figure 1 is a reference diagram of coordinated processing mode of the module and 3.3 V MCU.

Figure 2 is a 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 supply current of the module should exceed 500 mA, and total capacity of 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 WR2 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.