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WBR3 Wi-Fi Module

by Tuya Inc. - product page

Information  
Board code wbr3
MCU Realtek RTL8720CF
Series AmebaZ2
Partition layout Tuya (2x 896k apps)
Specifications  
Frequency 100 MHz
Flash size 2 MiB
RAM size 256 KiB
Voltage 3.0V - 3.6V
I/O 15x GPIO, 8x PWM, 3x UART
Wi-Fi 802.11 b/g/n
BLE v4.2
FCC ID 2ANDL-WBR3

Usage

Board code: wbr3

In platformio.ini:

[env:wbr3]
platform = libretiny
board = wbr3
framework = arduino

In ESPHome YAML:

rtl87xx:
  board: wbr3

Quick flashing guide

Pin Connection
PA15 / RX2 TX of USB-UART adapter
PA16 / TX2 RX of USB-UART adapter
PA00 (strapping pin) 3.3V to enter download mode
PA13 (strapping pin) 3.3V or floating
CEN (Chip-Enable) GND to reset the chip
  1. Connect the USB-UART adapter.
  2. Connect PA00 to 3.3V.
  3. Power-cycle the device or briefly short CEN to GND.
  4. Start the flashing process.

Pinout

Pinout

Pin functions

Name(s) UART IĀ²C SPI PWM Other
PA00 RX1 PWM0
PA01 TX1 PWM1
PA02 RX1 SCL0 CS0 PWM2
PA03 TX1 SDA0 SCK0 PWM3
PA04 MOSI0 PWM4
PA07 CS0
PA11 TX0 SCL0 PWM0
PA12 RX0 SDA0 PWM1
PA13 RX0 PWM7
PA14 TX0 PWM2
PA15 RX2 SCL0 CS0 PWM3
PA16 TX2 SDA0 SCK0 PWM4
PA17 PWM5
PA18 PWM6
PA19 SCL0 MOSI0 PWM7

Flash memory map

Flash size: 2 MiB / 2,097,152 B / 0x200000

Hex values are in bytes.

Name Code Start Length End
Partition Table part_table 0x000000 4 KiB / 0x1000 0x001000
System Data system 0x001000 4 KiB / 0x1000 0x002000
Calibration calibration 0x002000 4 KiB / 0x1000 0x003000
(reserved) - 0x003000 4 KiB / 0x1000 0x004000
Boot Image boot 0x004000 32 KiB / 0x8000 0x00C000
(reserved) - 0x00C000 16 KiB / 0x4000 0x010000
OTA1 Image ota1 0x010000 896 KiB / 0xE0000 0x0F0000
OTA2 Image ota2 0x0F0000 896 KiB / 0xE0000 0x1D0000
(reserved) - 0x1D0000 20 KiB / 0x5000 0x1D5000
Tuya Storage tuya 0x1D5000 64 KiB / 0x10000 0x1E5000
(reserved) - 0x1E5000 76 KiB / 0x13000 0x1F8000
LibreTiny Storage kvs 0x1F8000 32 KiB / 0x8000 0x200000

Flashing notes (download mode)

To enter the download mode it's required to use the strapping pin PA00. However, on the WBR3 that pin is on the bottom side of the PCB.

This means it is usually not possible to flash this module (via UART) without desoldering it.