Silicon Laboratories UG464 User Manual
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Silicon Laboratories UG464 User Manual

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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.
silabs.com | Building a more connected world.
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™
Rev. 1.0

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Summary of Contents for Silicon Laboratories UG464

  • Page 1 UG464: Thunderboard™ EFR32BG22 User's Guide The Thunderboard™ EFR32BG22 is a low cost, small form factor prototype and development platform for the EFR32BG22 Wireless TARGET DEVICE Gecko System-on-Chip. • EFR32 Wireless Gecko System-on-Chip (EFR32BG22C224F512IM40) The board is a small and cost effective, feature rich, prototype and development platform •...

  • Page 2: Table Of Contents

    Table of Contents 1. Introduction ....... . 4 1.1 Kit Contents ....... 4 1.2 Getting Started .
  • Page 3 5.2.3 Applied Emission Limits ......25 5.3 Relaxation with Modulated Carrier ..... . .25 5.4 Radiated Power Measurements .

  • Page 4: Introduction

    UG464: Thunderboard™ EFR32BG22 User's Guide Introduction 1. Introduction The Thunderboard EFR32BG22 (OPN: SLTB010A) has been designed to inspire customers to make battery operated IoT devices with the Silicon Labs EFR32BG22 Wireless Gecko System-on-Chip. The highlights of the board include four different environmental sensors and stereo PDM microphones accessible to the EFR32BG22 wireless MCU.

  • Page 5: Kit Hardware Layout

    UG464: Thunderboard™ EFR32BG22 User's Guide Introduction 1.4 Kit Hardware Layout The layout of the Thunderboard EFR32BG22 is shown below. 2.4 GHz Chip Antenna EFR32BG22 Left PDM Right PDM 30.4 mm Wireless Gecko Microphone Microphone Top View Bottom View Hall Effect...

  • Page 6: Specifications

    UG464: Thunderboard™ EFR32BG22 User's Guide Specifications 2. Specifications 2.1 Recommended Operating Conditions The following table is intended to serve as guideline for a correct use of Thunderboard EFR32BG22, indicating typical operating condi- tions and some design limits. Table 2.1. Recommended Operating Conditions...

  • Page 7: Current Consumption

    UG464: Thunderboard™ EFR32BG22 User's Guide Specifications 2.2 Current Consumption The table below summarizes the data sheet current consumption of the various components on the board. The operating current of the board greatly depends on the application. The number of enabled sensors, how often they are sampled and how often the radio is transmitting or receiving are examples of factors that influence the operating current.
  • Page 8 UG464: Thunderboard™ EFR32BG22 User's Guide Specifications Parameter Symbol Condition Unit On-board Debugger Sleep On-board debugger current consumption when USB cable is not inserted (EFM32GG12 EM4S mode current con- Current Consumption sumption) Minimum Board Current Minimum total board current consumption for VMCU = 3.0 µA...

  • Page 9: Hardware

    UG464: Thunderboard™ EFR32BG22 User's Guide Hardware 3. Hardware The core of the Thunderboard EFR32BG22 is the EFR32BG22 Wireless Gecko System-on-Chip. The board also contains several pe- ripherals connected to the EFR32BG22. For placement and layout of the hardware components the reader is referred to section 1.4 Kit...

  • Page 10: Power Supply

    UG464: Thunderboard™ EFR32BG22 User's Guide Hardware 3.2 Power Supply The kit can be powered through one of these interfaces: • USB Micro-B • Battery • Mini Simplicity connector The figure below shows the power options available on the kit and illustrates the main system power architecture.

  • Page 11: Peripherals

    UG464: Thunderboard™ EFR32BG22 User's Guide Hardware 3.4 Peripherals The Thunderboard EFR32BG22 contains a set of peripherals that can be accessed from the EFR32BG22. All the peripherals have ena- ble signals which can be used to completely turn off the peripherals that are not in use, or they can be put into a state that draws minus- cule amount of power.

  • Page 12: Si7021 Relative Humidity And Temperature Sensor

    UG464: Thunderboard™ EFR32BG22 User's Guide Hardware 3.4.1 Si7021 Relative Humidity and Temperature Sensor The Si7021 I C relative humidity and temperature sensor is a monolithic CMOS IC integrating humidity and temperature sensor ele- ments, an analog-to-digital converter, signal processing, calibration data, and an I C interface.

  • Page 13: Veml6035 Ambient Light Sensor

    UG464: Thunderboard™ EFR32BG22 User's Guide Hardware 3.4.3 VEML6035 Ambient Light Sensor The VEML6035 is an ambient light sensor with I C digital interface. On Thunderboard EFR32BG22, the VEML6035 is connected through a switch. The switch must therefore be enabled by setting EFR32_SENSOR_EN high before it can be used by the application.

  • Page 14: Icm-20648 6-Axis Inertial Sensor

    UG464: Thunderboard™ EFR32BG22 User's Guide Hardware 3.4.5 ICM-20648 6-Axis Inertial Sensor The ICM-20648 is a 6-axis inertial sensor consisting of a 3-axis gyroscope and a 3-axis accelerometer. The sensor detects acceleration and angular rate in and around the X-, Y- and Z-axes with integrated 16-bit ADCs and programmable digital filters.

  • Page 15: Push Button And Led

    UG464: Thunderboard™ EFR32BG22 User's Guide Hardware 3.4.6 Push Button and LED The kit has one user push button, marked BTN0, that is connected to a GPIO on the EFR32BG22. The button is connected to pin PB03 and it is debounced by an RC filter with a time constant of 1 ms. The logic state of the button is high while the button is not being pressed, and low when the button is pressed.

  • Page 16: On-Board Debugger

    UG464: Thunderboard™ EFR32BG22 User's Guide Hardware 3.5 On-board Debugger The Thunderboard EFR32BG22 contains a microcontroller separate from the EFR32BG22 Wireless Gecko that provides the user with an on-board J-Link debugger through the USB Micro-B port. This microcontroller is referred to as the "on-board debugger", and is not programmable by the user.

  • Page 17: Connectors

    UG464: Thunderboard™ EFR32BG22 User's Guide Hardware 3.6 Connectors Featured on the Thunderboard EFR32BG22 is a Mini Simplicity Connector, a USB Micro-B connector and 20 breakout pads that follow the EXP header pinout. The connectors are placed on the top side of the board, and their placement and pinout can be seen in the figure below.

  • Page 18: Breakout Pads

    UG464: Thunderboard™ EFR32BG22 User's Guide Hardware 3.6.1 Breakout Pads 20 breakout pads, which follow the EXP header pinout, are provided, and allow connection of peripherals or add-on boards. Ten of the pads are located along the left side of the board and ten are located on the right side. The breakout pads expose I/O pins that can be used with most of the EFR32BG22's features.

  • Page 19: Mini Simplicity Connector

    UG464: Thunderboard™ EFR32BG22 User's Guide Hardware 3.6.2 Mini Simplicity Connector The Mini Simplicity connector is a 10-pin 1.27 mm pitch connector that allows the use of an external debugger such as the one found on a Silicon Labs Wireless Starter Kit (WSTK) mainboard. See section 4.2 External Debugger...

  • Page 20: Debugging

    UG464: Thunderboard™ EFR32BG22 User's Guide Debugging 4. Debugging The Thunderboard EFR32BG22 contains an on-board SEGGER J-Link Debugger that interfaces to the target EFR32BG22 using the Serial Wire Debug (SWD) interface. The debugger allows the user to download code and debug applications running in the target EFR32BG22.

  • Page 21: On-Board Debugger

    UG464: Thunderboard™ EFR32BG22 User's Guide Debugging 4.1 On-board Debugger The on-board debugger is a SEGGER J-Link debugger running on an EFM32 Giant Gecko. The debugger is directly connected to the debug and VCOM pins of the target EFR32BG22. When the debug USB cable is inserted, the on-board debugger is automatically active, and takes control of the debug and VCOM inter- faces.

  • Page 22: Virtual Com Port

    UG464: Thunderboard™ EFR32BG22 User's Guide Debugging 4.3 Virtual COM Port The virtual COM port (VCOM) is a connection to a UART on the EFR32BG22, and allows serial data to be sent and received from the device. The on-board debugger presents this as a virtual COM port on the host computer that shows up when the USB cable is inser- ted.

  • Page 23: Radio

    UG464: Thunderboard™ EFR32BG22 User's Guide Radio 5. Radio 5.1 RF Section This section gives a short introduction to the RF section of the BRD4184B board. The schematic of the RF section is shown in the figure below. 2.4 GHz Chip Antenna and...

  • Page 24: Antenna

    UG464: Thunderboard™ EFR32BG22 User's Guide Radio 5.1.4 Antenna The BRD4184B has an on-board ceramic antenna. The land pattern for the antenna on the PCB layout was designed based on the recommendations of the antenna data sheet. Due to the fact that there is a significant difference between the layout (practically the board size) of the BRD4184B and the antenna evalua- tion board, the applied antenna matching network deviates from the recommendation.

  • Page 25: Applied Emission Limits

    UG464: Thunderboard™ EFR32BG22 User's Guide Radio 5.2.3 Applied Emission Limits The overall applied limits are shown in the table below. For the harmonics that fall into the FCC restricted bands, the FCC 15.209 limit is applied, and the ETSI EN 300-328 limit is applied for the rest.

  • Page 26: Radiated Power Measurements

    UG464: Thunderboard™ EFR32BG22 User's Guide Radio 5.4 Radiated Power Measurements The output power of the EFR32BG22 was set to 6 dBm. The board was supplied through its USB connector by connecting to a PC through a USB cable. During the measurements the board was rotated in three cuts, see the reference plane illustration in the figure below. The radiated powers of the fundamental and the harmonics were measured with horizontal and vertical reference antenna polarizations.

  • Page 27: Antenna Pattern Measurement

    UG464: Thunderboard™ EFR32BG22 User's Guide Radio 5.4.2 Antenna Pattern Measurement The measured typical antenna patterns are shown in the figures below. Normalized Radiation Pattern [dB], XY cut 0° 315° 45° 270° 90° 225° 135° Horizontal 180° Vertical Figure 5.4. Antenna Pattern - XY silabs.com | Building a more connected world.
  • Page 28 UG464: Thunderboard™ EFR32BG22 User's Guide Radio Normalized Radiation Pattern [dB], XZ cut 0° 315° 45° 270° 90° 225° 135° Horizontal 180° Vertical Figure 5.5. Antenna Pattern - XZ silabs.com | Building a more connected world. Rev. 1.0 | 28...

  • Page 29: Emc Compliance Recommendations

    UG464: Thunderboard™ EFR32BG22 User's Guide Radio Normalized Radiation Pattern [dB], YZ cut 0° 315° 45° 270° 90° 225° 135° Horizontal 180° Vertical Figure 5.6. Antenna Pattern - YZ 5.5 EMC Compliance Recommendations 5.5.1 Recommendations for 2.4 GHz ETSI EN 300-328 Compliance As it was shown in the previous chapter, with the EFR32BG22 output power set to 6 dBm, the radiated power of the fundamental of the BRD4184B complies with the 20 dBm limit of the ETSI EN 300-328.

  • Page 30: Schematics, Assembly Drawings, And Bom

    UG464: Thunderboard™ EFR32BG22 User's Guide Schematics, Assembly Drawings, and BOM 6. Schematics, Assembly Drawings, and BOM Schematics, assembly drawings, and bill of materials (BOM) are available through Simplicity Studio when the kit documentation pack- age has been installed. They are also available from the kit page on the Silicon Labs website: http://www.silabs.com/.

  • Page 31: Kit Revision History

    UG464: Thunderboard™ EFR32BG22 User's Guide Kit Revision History 7. Kit Revision History The kit revision can be found printed on the box label of the kit, as outlined in the figure below. The kit revision history is summarized in the table below.

  • Page 32: Board Revision History And Errata

    UG464: Thunderboard™ EFR32BG22 User's Guide Board Revision History and Errata 8. Board Revision History and Errata 8.1 Revision History The board revision can be found laser printed on the board, and the board revision history is summarized in Table 8.1 Board Revision History on page Table 8.1.

  • Page 33: Document Revision History

    UG464: Thunderboard™ EFR32BG22 User's Guide Document Revision History 9. Document Revision History Revision 1.0 June, 2021 • Initial document version. silabs.com | Building a more connected world. Rev. 1.0 | 33...
  • Page 34 Note: This content may contain offensive terminology that is now obsolete. Silicon Labs is replacing these terms with inclusive language wherever possible. For more information, visit www.silabs.com/about-us/inclusive-lexicon-project Trademark Information Silicon Laboratories Inc. , Silicon Laboratories , Silicon Labs , SiLabs...

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