EFR32xG28 Explorer Kit (xG28-EK2705A)

Board Overview

EFR32xG28 Explorer Kit (xG28-EK2705A)

Name:

xg28_ek2705a

Vendor:

Silicon Laboratories

Status:

Maintained

Architecture:

arm

SoC:

efr32zg28b312f1024im48

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Overview

The EFR32xG28 Explorer Kit is a small form factor development and evaluation platform based on the EFR32xG28 System-on-Chip. The EFR32xG28 Explorer Kit is focused on rapid prototyping and concept creation of IoT applications for Sub-GHz and Bluetooth LE like Wi-SUN, Amazon Sidewalk, Z-Wave, Wireless M-Bus, and proprietary networks.

Hardware

• EFR32ZG28B312F1024IM48 SoC

• CPU core: ARM Cortex®-M33 with FPU

• Flash memory: 1024 kB

• RAM: 256 kB

• Transmit power: up to +10 dBm (2.4 GHz) and +14 dBm (sub-GHz)

• Operation frequency: 2.4 GHz and sub-GHz

• Crystals for HFXO (39 MHz) and LFXO (32.768 kHz) on the board

For more information about the xG28 SoC and Explorer Kit, refer to these documents:

• EFR32xG28 Datasheet

• EFR32xG28 Reference Manual

• xG28-EK2705A User Guide

Supported Features

The xg28_ek2705a 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.

xg28_ek2705a/efr32zg28b312f1024im48 target

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M33 CPU1	arm,cortex-m33
ADC	on-chip	Silicon Labs Series 2 IADC1	silabs,iadc
Bluetooth	on-chip	Silicon Labs Series 2 Bluetooth HCI1	silabs,bt-hci-efr32
Clock control	on-chip	Silicon Labs Series 2 CMU1	silabs,series-clock
	on-chip	Silicon Labs Series 2 HFRCODPLL1	silabs,series2-hfrcodpll
	on-chip	Generic fixed-rate clock provider3	fixed-clock
	on-chip	Silicon Labs Series 2 LFXO1	silabs,series2-lfxo
	on-chip	Silicon Labs Series 2 LFRCO1	silabs,series2-lfrco
	on-chip	Silicon Labs Series 2 HFRCOEM231	silabs,series2-hfrcoem23
	on-chip	Silicon Labs Series 2 HFXO1	silabs,hfxo
	on-chip	Generic fixed factor clock provider22	fixed-factor-clock
Comparator	on-chip	Silicon Labs Series 2 ACMP2	silabs,acmp
Counter	on-chip	Silicon Labs TIMER Counter5	silabs,timer-counter
	on-chip	Silicon Labs Series 2 BURTC1	silabs,burtc-counter
	on-chip	Silicon Labs PROTIMER counter1	silabs,protimer
CRC	on-chip	Silabs General Purpose CRC1	silabs,gpcrc
Cryptographic accelerator	on-chip	Silicon Labs Series 2 SE Mailbox1	silabs,gecko-semailbox
DAC	on-chip	Silicon Labs Series 2 VDAC 1	silabs,vdac
Debug	on-chip	Silicon Labs Packet Trace Interface1	silabs,pti
	on-chip	ARMv8 instrumentation trace macrocell1	arm,armv8m-itm
DMA	on-chip	Silicon Labs Series 2 LDMA1	silabs,ldma
Flash controller	on-chip	Silicon Labs Series 2 MSC1	silabs,series2-flash-controller
GPIO & Headers	on-chip	Silicon Labs Series 2 GPIO Peripheral1	silabs,gpio
	on-chip	Silicon Labs Series 2 GPIO Port4	silabs,gpio-port
	on-board	GPIO pins exposed on Mikro BUS headers1	mikro-bus
	on-board	STEMMA QT is a 4-pin JST-SH connector for I2C devices1	stemma-qt-connector
I2C	on-chip	Silicon Labs Series 2 I2C11	silabs,i2c
Input	on-board	Group of GPIO-bound input keys1	gpio-keys
Interrupt controller	on-chip	ARMv8-M NVIC (Nested Vectored Interrupt Controller)1	arm,v8m-nvic
LED	on-board	Group of GPIO-controlled LEDs1	gpio-leds
	on-board	Group of PWM-controlled LEDs1	pwm-leds
MMU / MPU	on-chip	ARMv8-M MPU (Memory Protection Unit)1	arm,armv8m-mpu
MTD	on-chip	Flash node1	soc-nv-flash
	on-board	Fixed partitions of a flash (or other non-volatile storage) memory1	fixed-partitions
Networking	on-chip	Silicon Labs Series 2 Radio Interface1	silabs,series2-radio
Pin control	on-chip	Silicon Labs Series 2 DBUS Pin Controller1	silabs,dbus-pinctrl
PWM	on-chip	Silicon Labs TIMER PWM14	silabs,timer-pwm
	on-chip	Silicon Labs LETIMER PWM1	silabs,letimer-pwm
Regulator	on-chip	Silicon Labs Series 2 DC-DC converter1	silabs,series2-dcdc
Retained memory	on-chip	Silicon Labs Series 2 BURAM1	silabs,buram
RTC	on-chip	Silicon Labs Series 2 SYSRTC1	silabs,sysrtc
Serial controller	on-chip	Silicon Labs Series 2 USART1	silabs,usart-uart
SPI	on-chip	Silicon Labs Series 2 EUSART 12	silabs,eusart-spi
SRAM	on-chip	Generic on-chip SRAM1	mmio-sram
Timer	on-chip	ARMv8-M System Tick1	arm,armv8m-systick
	on-chip	Silicon Labs TIMER14	silabs,series2-timer
	on-chip	Silicon Labs LETIMER1	silabs,series2-letimer
Watchdog	on-chip	Silicon Labs Series 1-2 WDOG11	silabs,gecko-wdog

System Clock

The xG28 SoC is configured to use the HFRCODPLL oscillator at 78 MHz as the system clock, locked to the 39 MHz crystal oscillator.

Serial Port

The xG28 SoC has 1 USART and 3 EUSARTs. USART0 is connected to the board controller and is used for the console.

Programming and Debugging

The xg28_ek2705a board supports the runners and associated west commands listed below.

	flash	debug	debugserver	attach	rtt	reset
jlink	✅ (default)	✅ (default)	✅	✅	✅	✅
silabs_commander	✅

Flashing

Connect the Explorer Kit 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_ek2705a 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_ek2705a

Bluetooth

To use Bluetooth functionality as well as other wireless functionality, run the command below to retrieve necessary binary blobs from the Silicon Labs HAL repository.

west blobs fetch hal_silabs

Then build the Zephyr kernel and a Bluetooth sample with the following command. The Observer sample application is used in this example.

# From the root of the zephyr repository
west build -b xg28_ek2705a samples/bluetooth/observer