UG464: Thunderboard™ EFR32BG22

User's Guide

The Thunderboard™ EFR32BG22 is a low cost, small form factor

prototype and development platform for the EFR32BG22 Wireless

Gecko System-on-Chip.

The board is a small and cost effective, feature rich, prototype and development platform

based on the EFR32™ Wireless Gecko System-on-Chip. The Thunderboard

EFR32BG22 is an ideal platform for developing energy-friendly connected IoT devices.

The Thunderboard EFR32BG22 ships with a Bluetooth demo that works with a cloud

connected smartphone app, showcasing easy collection of environmental and motion

sensor data, as well as button and LED control.

A built in SEGGER J-Link debugger ensures easy debugging through the USB Micro-B

connector.

TARGET DEVICE

• EFR32 Wireless Gecko System-on-Chip

(EFR32BG22C224F512IM40)

• 32-bit ARM® Cortex®-M33 with 76.8

MHz maximum operating frequency

• 512 kB flash and 32 kB RAM

• Energy-efficient radio core with low

active and sleep currents

• Bluetooth 5.2 Direction Finding

• Integrated PA with up to 6 dBm (2.4

GHz) TX power

• Secure Boot with Root of Trust and

Secure Loader (RTSL)

KIT FEATURES

• 2.4 GHz ceramic chip antenna

• Power control of on-board peripherals for

ultra low power operation

• Relative humidity and temperature sensor

• Ambient light sensor

• Hall effect sensor

• 6-axis inertial sensor

• PDM stereo microphones

• 8 Mbit flash for OTA programming and

data logging

• User LED and push button

• 20-pin 2.54 mm breakout pads

• SEGGER J-Link on-board debugger

• Virtual COM port

• Packet Trace Interface (PTI)

• Mini Simplicity connector for AEM and

packet trace using external Silicon Labs

debugger

• USB or coin cell battery powered.

SOFTWARE SUPPORT

• Simplicity Studio™

silabs.com

| Building a more connected world. Rev. 1.0

Table of Contents

1. Introduction ................................4

1.1 Kit Contents ...............................4

1.2 Getting Started ..............................4

1.3 Hardware Content .............................4

1.4 Kit Hardware Layout ............................5

2. Specifications ...............................6

2.1 Recommended Operating Conditions ......................6

2.2 Current Consumption ............................7

3. Hardware .................................9

3.1 Block Diagram ..............................9

3.2 Power Supply ..............................10

3.3 EFR32BG22 Reset ............................10

3.4 Peripherals ...............................11

3.4.1 Si7021 Relative Humidity and Temperature Sensor ................12

3.4.2 Si7210 Hall Effect Sensor .........................12

3.4.3 VEML6035 Ambient Light Sensor ......................13

3.4.4 PDM Stereo Microphones .........................13

3.4.5 ICM-20648 6-Axis Inertial Sensor ......................14

3.4.6 Push Button and LED ..........................15

3.4.7 External Memory ............................15

3.5 On-board Debugger ............................16

3.6 Connectors ...............................17

3.6.1 Breakout Pads ............................18

3.6.2 Mini Simplicity Connector .........................19

3.6.3 Debug USB Micro-B Connector .......................19

4. Debugging ...............................20

4.1 On-board Debugger ............................21

4.2 External Debugger.............................21

4.3 Virtual COM Port .............................22

5. Radio .................................23

5.1 RF Section ...............................23

5.1.1 Description of the RF Matching .......................23

5.1.2 RF Section Power Supply .........................23

5.1.3 RF Matching Bill of Materials ........................23

5.1.4 Antenna ...............................24

5.1.5 Antenna Matching Bill of Materials ......................24

5.2 EMC Regulations for 2.4 GHz .........................24

5.2.1 ETSI EN 300-328 Emission Limits for the 2400-2483.5 MHz Band ...........24

5.2.2 FCC15.247 Emission Limits for the 2400-2483.5 MHz Band .............24

silabs.com

| Building a more connected world. Rev. 1.0 | 2