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Tuya IoT Development Platform

Wi-Fi & Bluetooth LE ST (G07) (WBRU) Board

Last Updated on : 2022-10-26 06:59:47

This multifunctional development board comes with a WBRU Wi-Fi and Bluetooth Low Energy (LE) combo module and an STM32G070 microcontroller (MCU) from STMicroelectronics. It can work with circuit modules or boards to help you prototype ideas and evaluate solutions.

Wi-Fi & Bluetooth LE ST (G07) (WBRU) Board Wi-Fi & Bluetooth LE ST (G07) (WBRU) Board

Applications

  • This development board applies to most custom solutions developed with the MCU SDK. You can use it to build Wi-Fi projects where the network modules communicate with the MCU through the serial protocol.
  • Develop with the board to build your IoT projects easily and fast.
  • You can use this board for different development purposes.
    • Embedded program development and debugging
    • App development and debugging
    • Creating connected devices that can be controlled with a mobile phone
    • Getting started with IoT development and learning how the Wi-Fi-based control system works

Components

The development board is integrated with Tuya’s proprietary high-performance WBRU Wi-Fi and Bluetooth LE combo module and STM32G070 MCU from STMicroelectronics. It has onboard MCU reset buttons, LED, power port, and a USB-to-serial chip.
For more information, see the WBRU Module Datasheet.
For more information, see Wi-Fi General Solution.

I/O port and pin description

Wi-Fi & Bluetooth LE ST (G07) (WBRU) Board
  • 1: Micro-USB: Input 5V DC voltage and provide one extended serial port.

  • 2: Button (RST): Reset the STM32G070 MCU. Press the button to output low level signals.

  • 3: LED indicator: Indicate the power state when the board is powered via the micro-USB connection.

  • 4: Power selection jumper: Use a jumper cap to switch the power supply between the USB connection and external power supply.

  • 5: USB to UART jumper: Use a jumper cap on PA9 and PA10 to connect to the USB-to-serial chip.

  • 6: UART selection jumper: Use a jumper cap on PA2 and PA3 to connect the MCU to the WBRU module.

  • 7: LED indicator: When PC6 outputs high, the LED is on.

  • 8: External battery pin header: Connect a button cell to the positive (+) and negative (-) terminals for verifying low power mode.

    Pin description

    No. Symbol Description Alternate functions
    1 NC Leave it floating. -
    2 NC Leave it floating. -
    3 RST Reset the STM32G070 MCU. Active low. -
    4 3.3V 3.3V power pin. -
    5 5V 5V power pin. -
    6 GND Ground pin. -
    7 GND Ground pin. -
    8 NC Leave it floating. -
    9 PA0 I/O SPI2_SCK, USART2_CTS, USART4_TX, ADC_IN0, TAMP_IN2, and WKUP1
    10 PA1 I/O SPI1_SCK/I2S1_CK, USART2_RTS_DE_CK, USART4_RX, TIM15_CH1N, I2C1_SMBA, EVENTOUT, and ADC_IN1
    11 PA4 I/O SPI1_NSS/I2S1_WS, SPI2_MOSI, TIM14_CH1, EVENTOUT, ADC_IN4, and RTC_OUT2
    12 PA5 I/O SPI1_SCK/I2S1_CK, USART3_TX, EVENTOUT, and ADC_IN5
    13 PA6 I/O SPI1_MISO/I2S1_MCK, TIM3_CH1, TIM1_BKIN, USART3_CTS, TIM16_CH1, and ADC_IN6
    14 PA7 I/O SPI1_MOSI/I2S1_SD, TIM3_CH2, TIM1_CH1N, TIM14_CH1, IM17_CH1, and ADC_IN7
    15 PB11 I/O SPI2_MOSI, USART3_RX, I2C2_SDA, and ADC_IN15
    16 PB10 I/O USART3_TX, SPI2_SCK, I2C2_SCL, and ADC_IN11
    17 PC13 I/O TIM1_BKIN, TAMP_IN1,RTC_TS, RTC_OUT1, and WKUP2
    18 PB9 I/O IR_OUT, TIM17_CH1, USART3_RX, SPI2_NSS, I2C1_SDA, and EVENTOUT
    19 PA15 I/O SPI1_NSS/I2S1_WS, USART2_RX, USART4_RTS_DE_CK, USART3_RTS_DE_CK, and EVENTOUT
    20 PD2 I/O USART3_RTS_DE_CK, TIM3_ETR, and TIM1_CH1N
    21 PB5 I/O SPI1_MOSI/I2S1_SD, TIM3_CH2, TIM16_BKIN, I2C1_SMBA, and WKUP6
    22 PA8 I/O MCO, SPI2_NSS, TIM1_CH1, and EVENTOUT
    23 PA11 I/O SPI1_MISO/I2S1_MCK, USART1_CTS, TIM1_CH4, TIM1_BKIN2, and I2C2_SCL
    24 PA12 I/O SPI1_MOSI/I2S1_SD, USART1_RTS_DE_CK, TIM1_ETR, I2S_CKIN, and I2C2_SDA
    25 PB12 I/O SPI2_NSS, TIM1_BKIN, TIM15_BKIN, EVENTOUT, and ADC_IN16
    26 PB15 I/O SPI2_MOSI, TIM1_CH3N, TIM15_CH1N, TIM15_CH2, EVENTOUT, and RTC_REFIN
    27 PB14 I/O SPI2_MISO, TIM1_CH2N, USART3_RTS_DE_CK, TIM15_CH1, I2C2_SDA, and EVENTOUT
    28 PB13 I/O SPI2_SCK, TIM1_CH1N, USART3_CTS, TIM15_CH1N, I2C2_SCL, and EVENTOUT
    29 GND Ground pin. -
    30 VCCA ADC power ground. -
    31 PB7 I/O USART1_RX, SPI2_MOSI, TIM17_CH1N, USART4_CTS, I2C1_SDA, and EVENTOUT
    32 PB6 I/O USART1_TX, TIM1_CH3, TIM16_CH1N, SPI2_MISO, I2C1_SCL, and EVENTOUT
  • STM32G070 MCU debugging pins

    No. Symbol Description Alternate functions
    1 3.3V 3.3V power pin. -
    2 GND Ground pin. -
    3 SWC The serial wire debug port (SW-DP), SWCLK PA14, BOOT0, USART2_TX, and EVENTOUT
    4 SWD The serial wire debug port (SW-DP), SWDIO PA13, IR_OUT, and EVENTOUT
  • WBRU module debugging pins

    No. Symbol Description Alternate functions
    1 LRX I/O GPIOA_15, which can be used as the UART_Log_RXD pin to receive logs.
    2 LTX I/O GPIOA_16, which can be used as the UART_Log_TXD pin to send logs.
    3 MA0 I/O GPIOA_0. Pull-up will trigger the testing mode. It is not recommended to add an external pull-up resistor for this pin.
    4 MEN The reset pin. Active low. -
    5 GND Ground pin. -
    6 MVC 3.3V power pin on the module. -

Load-carrying capacity

  • When micro-USB inputs 5V DC voltage, the board can supply power to external components.

    Power pin Rated voltage/maximum current
    VDD 5V/0.4A
    VCC 3.3V/0.4A

    The micro-USB input port is connected to a 5V/0.5A resettable fuse in series. The total supply current and output current of the development board cannot exceed 0.5A.

  • Characteristics of the output voltage of 3.3V

    Output current 0A 0.15A 0.3A 0.45A
    Output voltage 3.34V 3.36V 3.37V 3.37V

    We tested the voltage under the condition that there is no output voltage on the micro-USB (CN1) terminal.

Schematic diagram and PCB

  • The schematic diagram of the board:

    Wi-Fi & Bluetooth LE ST (G07) (WBRU) Board

  • The PCB board:

    Wi-Fi & Bluetooth LE ST (G07) (WBRU) Board

Jumper settings

  • The board has a built-in USB-to-serial chip. You can use a jumper cap on PA9 and PA10 to connect the MCU to the USB-to-serial chip.

    Pin connection description

    Silkscreen P2 P3
    MCU pin PA10 PA9
    USB-to-serial chip USB-TXD USB-RXD
  • You can use a jumper cap on PA2 and PA3 to connect the MCU to the WBRU module.

    Pin connection description

    Silkscreen P5 P7
    MCU pin PA3 PA2
    WBRU module TX RX
  • You can use a jumper cap to switch the power supply between the USB connection and external power supply. The following table provides the description of pin header P4.

    Silkscreen Description
    BAT Place a jumper cap on BAT and 3.3V to supply power via battery.
    3.3V 3.3V power output pin.
    USB Place a jumper cap on USB and 3.3V to supply power via USB connection.

    The + and - pin headers are used to connect to a CR2450 battery.

Module connection for flashing

For flashing license and firmware, connect pins following the table and figure shown below.

Microcontroller board Pin header P11 Module pin Connector
Wi-Fi & Bluetooth LE ST (G07) (WBRU) board MVC 3V3 Connect to UART with jumper wires
GND GND
MEN EN
MA0 PA0
LTX L_TX
LRX L_RX

USB-to-serial chip driver

Download the USB-to-serial chip driver for your operating system.

Things to note

  • The board has a built-in micro-USB port, so the additional power board is not necessary.
  • If you connect the board to a power board, do not use the micro-USB port for voltage input.