EFR32xG28 868-915 MHz 20 dBm (xG28-RB4401C)

Overview

The EFR32ZG28 Radio Board is the radio board delivered with xG28-PK6025A Website. It contains a Wireless System-On-Chip from the EFR32ZG28 family built on an ARM Cortex®-M33 processor with excellent low power capabilities.

The BRD4401C a.k.a. xG28-RB4401C radio board plugs into the Wireless Pro Kit Mainboard BRD4002A and is supported as one of Radio Boards.

Hardware

  • EFR32ZG28B322F1024IM68 SoC

  • CPU core: ARM Cortex®-M33 with FPU

  • Flash memory: 1024 kB

  • RAM: 256 kB

  • Transmit power: up to +20 dBm

  • Operation frequency: 868-915 MHz

  • Crystals for LFXO (32.768 kHz) and HFXO (39 MHz).

  • Silicon Labs Si7021 relative humidity and temperature sensor

  • Low-power 128x128 pixel Memory LCD

  • Macronix ultra low power 8-Mbit SPI flash (MX25R8035F)

For more information about the EFR32ZG28 SoC and BRD4401C board, refer to these documents:

Supported Features

The xg28_rb4401c board supports the hardware features listed below.

on-chip / on-board
Feature integrated in the SoC / present on the board.
2 / 2
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files.
vnd,foo
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.

Connections and IOs

In the following table, the column Name contains Pin names. For example, PA2 means Pin number 2 on PORTA, as used in the board’s datasheets and manuals.

Name

Function

Usage

PA8

UART_TX

UART Console TX

PA9

UART_RX

UART Console RX

PB1

GPIO

Push Button 0

PB2

GPIO

LED0

PB3

GPIO

Push Button 1

PC1

US1_TX

Display/Flash SPI MOSI

PC2

US1_RX

Serial Flash MISO

PC3

US1_CLK

Serial Flash/Display SPI Clock

PC4

US1_CS

Serial Flash Chip Select

PC5

I2C0_SCL

Si7021 I2C Clock

PC6

GPIO

External COM Inversion Signal

PC7

I2C0_SDA

Si7021 I2C Data

PC8

US1_CS

Display Serial Chip Select

PC9

GPIO

Display Control Access

PC11

GPIO

Si7021 Enable

PD3

GPIO

LED1

The default configuration can be found in boards/silabs/radio_boards/xg28_rb4401c/xg28_rb4401c_defconfig

System Clock

The EFR32ZG28 SoC is configured to use the 39 MHz external oscillator on the board.

Serial Port

The EFR32ZG28 SoC has one USART and three EUSARTs. USART0 is connected to the board controller and is used for the console.

Programming and Debugging

The xg28_rb4401c board supports the runners and associated west commands listed below.

flash debug

Flashing

Connect the BRD4002A board with a mounted BRD4401C radio module to your host computer using the USB port.

Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b xg28_rb4401c samples/hello_world
west flash

Open a serial terminal (minicom, putty, etc.) with the following settings:

  • Speed: 115200

  • Data: 8 bits

  • Parity: None

  • Stop bits: 1

Reset the board and you should see the following message in the terminal:

Hello World! xg28_rb4401c/efr32zg28b322f1024im68