MSRP $19.99

EFR32BG22 Thunderboard Kit

Thunderboard BG22 is a small form-factor, optimized development platform for adding Bluetooth connectivity to battery-powered IoT products. 

MSRP $19.99


Small Form Factor Thunderboard

  • EXP compatible breakouts

Target device

  • EFR32BG22
    • Secure Bluetooth 5.2 SoCs for high-volume products
    • 76.8 MHz, ARM Cortex-M33 with 512 kB of flash and 32 kB RAM
    • Bluetooth 5.2 Radio with supported for direction finding and LE coded PHY
  • 38.4 MHz HFXO crystal
  • 32.768 kHz LFXO crystal
  • 2.4 GHz matching network and chip antenna

On-board Board controller

  • J-Link debugger
    • SWD physical layer
  • Packet trace over UART/async protocol
  • Virtual COM with hardware flow control

USB Micro-B connector for debug connection

User interface features:

  • 1x button (with EM2 wake-up)
  • 1x LED

Data storage / OTA support

  • 8 Mbit SPI flash

Power save features

  • Controllable and separate power domain(s) for sensors

Mobile app for Android and iOS

  • View sensor data, control LEDs and detect button pushes
  • iOS app implemented in swift
  • Android app implemented in native code
  • Source code available at GitHub


Mini Simplicity Debug Connector (SLSDA001A compatible) with access to:

  • AEM
  • PTI
  • VCOM
  • SWD

Setting up your Thunderboard BG22 Kit


  • Thunderboard BG22 Kit
  • Coin cell battery or Micro-USB cable (not included)

Step 1: Unbox Thunderboard BG22

  1. Remove Thunderboard EFR32BG22 from the box.
  2. Supply power to your Thunderboard EFR32BG22: place a battery in the coin cell battery holder on the bottom of the board, or plug in a micro-USB cable.

Step 2: Use the Thunderboard Mobile App

There are several apps available for Thunderboard from Silicon Labs and our partners. In this guide, we will use the official app from Silicon Labs.

  1. Download the Thunderboard mobile app
  2. Enable Bluetooth on your mobile phone

Launch the app to discover your Thunderboard BG22.

Press the Reset button on the Thunderboard BG22 to restart advertising.  

After connecting with the Thunderboard BG22 you will be taken to the app dashboard. 

Step 3: Try the Sensors

When you have successfully connected the Thunderboard BG22, we are ready to test the board features. 

  • Select the motion and calibrate the board and test the accelerometer and gyroscope.
  • Select "Environment" to test a number of environmental sensors
    • Humidity and Temperature: Blow or cover the temp. sensor with your finger
    • Light: Cover or shine a light on the board
    • Magnetic Field and Door State: Move a magnet near the Hall Effect sensor and observe the effects
    • Motion: Move the board to the other side of the room or building
  • Select "I/O" to test a buttons and LEDs.
    • Switches: Press the two push buttons on the board    
    • Lights: The app switches will turn on/off the small LEDs on the board     

Developing with your Thunderboard BG22 Kit


  • Thunderboard BG22 Kit
  • Micro-USB cable
  • Simplicity Studio
  • Bluetooth SDK

Step 1: Get Simplicity Studio

Download Simplicity Studio and run the installer. If you already have Simplicity Studio installed, you can skip to Step 5.

Step 2: Connect to your computer

Connect the Thunderboard EFR32BG22 to your computer using a micro-USB B cable. A blue LED should turn on next to the USB connector to verify connectivity.

Step 3: Install drivers

Follow the Installation Wizard so it can install the basic drivers.

Step 4: Log-in

By logging in, you will get access to the required wireless stacks and SDKs for Thunderboard EFR32BG22. You do not need to register your Thunderboard EFR32BG22 at this time.

Step 5: Install the latest software

5a. If this is your first time to install Simplicity Studio, simply follow the Install Wizard recommendations based on the detected “Connected Devices”.

5b. If you already had Simplicity Studio installed, click on the “Update Software” button and choose the “Install Wizard” from the bottom of the dialog box.

5c. Insure that latest version of the "Bluetooth SDK" (version 2.6 or later) is installed.

5d. In the Launcher window, click to change the preferred SDK, and choose the Gecko SDK Suite featuring the latest Bluetooth SDK.

Step 6: Cloning a Project

In the Launcher perspective, with your EFR32BG22 kit selected in the Devices window, select the desired project from the available “Software Examples”. This action will clone the pre-tested project. From here you can explore and modify and source code, compile, and debug.


workshop series

Bluetooth Workshops: BG22 Project Series

Join us on the 3rd Tuesday of every month and learn new ways to integrate Bluetooth connectivity into your next project with the help of Silicon Labs expert engineers. Each project session will explore and solve challenges developers often face when building new Bluetooth designs.

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