Silicon Laboratories UG524 User Manual
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Silicon Laboratories UG524 User Manual

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UG524: xG24 Dev Kit User's Guide
The xG24 Dev Kit is a low-cost, small form factor development
and evaluation platform for the EFR32MG24 Wireless Gecko Sys-
tem-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 xG24 Dev Kit is an ideal
platform for developing energy-friendly connected IoT devices.
The xG24 Dev Kit ships with a Bluetooth demo that works with a cloud-connected smart-
phone app, showcasing easy collection of environmental and motion sensor data.
A built-in SEGGER J-Link debugger ensures easy debugging through the USB Micro-B
connector.
silabs.com | Building a more connected world.
Copyright © 2022 by Silicon Laboratories
TARGET DEVICE
• EFR32 Wireless Gecko System-on-Chip
(EFR32MG24B310F1536IM48-B)
• High-performance 2.4 GHz radio
• 32-bit ARM® Cortex®-M33 with 78.0 MHz
maximum operating frequency
• 1536 flash and 256 kB RAM
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
• MEMS stereo microphones
• Pressure sensor
• 32 Mbit flash for OTA programming and
data logging
• RGB LED and two push buttons
• Precise voltage reference and dedicated
U.FL connector for ADC measurements
• 20-pin 2.54 mm breakout pads
• Qwiic® connector
• 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
• External battery connector
SOFTWARE SUPPORT
• Simplicity Studio™
Rev. 0.1

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Summary of Contents for Silicon Laboratories UG524

  • Page 1 UG524: xG24 Dev Kit User's Guide The xG24 Dev Kit is a low-cost, small form factor development TARGET DEVICE and evaluation platform for the EFR32MG24 Wireless Gecko Sys- tem-on-Chip. • EFR32 Wireless Gecko System-on-Chip (EFR32MG24B310F1536IM48-B) 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 5.1.4 Antenna .......25 5.1.5 Antenna Matching Bill of Materials ..... .25 5.2 EMC Regulations for 2.4 GHz .

  • Page 4: Introduction

    UG524: xG24 Dev Kit User's Guide Introduction 1. Introduction The xG24 Dev Kit (OPN: xG24-DK2601B) has been designed to inspire customers to make battery-operated IoT devices with the Sili- con Labs EFR32MG24 Wireless Gecko System-on-Chip. The highlights of the board include five different environmental sensors, ster- eo I2S microphones, and a dedicated ADC U.FL connector and precise voltage reference, all accessible to the EFR32MG24 wireless...

  • Page 5: Kit Hardware Layout

    UG524: xG24 Dev Kit User's Guide Introduction 1.4 Kit Hardware Layout xG24 Dev Kit layout is shown below. 2.4 GHz Chip Antenna 30.4 mm Right I2S Reset Button Left I2S Microphone Top View Microphone Bottom View EFR32MG24 Wireless Gecko Hall Effect U.FL (ADC)

  • Page 6: Specifications

    UG524: xG24 Dev Kit User's Guide Specifications 2. Specifications 2.1 Recommended Operating Conditions Parameter Symbol Unit USB Supply Input Voltage — — Battery Supply Input Voltage VBAT 1,2,3 Supply Input Voltage (VMCU supplied externally) VMCU Operating Temperature — — ˚C Note: 1.

  • Page 7: Current Consumption

    UG524: xG24 Dev Kit User's Guide Specifications 2.2 Current Consumption The operating current of the board greatly depends on the application. The table below attempts to give some indication of how different features of the board contribute to the overall power consumption. Note that the numbers are taken from the data sheets for the devi- ces.
  • Page 8 UG524: xG24 Dev Kit 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) From EFR32MG24 Wireless Gecko SoC data sheet From Si7021-A20 data sheet...

  • Page 9: Hardware

    UG524: xG24 Dev Kit User's Guide Hardware 3. Hardware The core of the xG24 Dev Kit is the EFR32MG24 Wireless Gecko System-on-Chip. The board also contains several peripherals con- nected to the EFR32MG24. Refer to section 1.4 Kit Hardware Layout for placement and layout of the hardware components.

  • Page 10: Power Supply

    UG524: xG24 Dev Kit User's Guide Hardware 3.2 Power Supply The kit can be powered through one of these interfaces: • USB Micro-B • Battery (CR2032 battery or external battery connected through 2-pin battery header) • Mini Simplicity connector The figure below shows the power options available on the kit and illustrates the main system power architecture.

  • Page 11: Peripherals

    UG524: xG24 Dev Kit User's Guide Hardware 3.4 Peripherals The xG24 Dev Kit contains a set of peripherals that can be accessed from the EFR32MG24. All the peripherals have enable 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 minuscule amount of power.

  • Page 12: Si7021 Relative Humidity And Temperature Sensor

    UG524: xG24 Dev Kit 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: Ics-43434 Mems Stereo Microphones

    UG524: xG24 Dev Kit User's Guide Hardware 3.4.3 ICS-43434 MEMS Stereo Microphones The ICS-43434 microphones are omnidirectional MEMS microphones with a wideband frequency response and a digital I S output. The microphones include a MEMS sensor, signal conditioning, ADC, filters, and different operating modes. The ICS-43434 is a bottom port microphone, and it is placed on the bottom side of xG24 Dev Kit with acoustic ventilation holes going through to the top side.

  • Page 14: Icm-20689 6-Axis Inertial Sensor

    UG524: xG24 Dev Kit User's Guide Hardware 3.4.4 ICM-20689 6-Axis Inertial Sensor The ICM-20689 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: Veml6035 Ambient Light Sensor

    UG524: xG24 Dev Kit User's Guide Hardware 3.4.5 VEML6035 Ambient Light Sensor The VEML6035 is an ambient light sensor with I C digital interface. On xG24 Dev Kit, the VEML6035 is connected through a switch. The switch must therefore be enabled by setting PC09 high before it can be used by the application.

  • Page 16: External Memory

    UG524: xG24 Dev Kit User's Guide Hardware 3.4.7 External Memory The xG24 Dev Kit includes a 32 Mbit Macronix SPI Flash that is connected directly to the EFR32MG24. The MX25R series are ultra-low power serial flash devices, so there is no need for a separate enable switch to keep current consumption down. However, it is important that the flash is always put in deep power down mode when not used.

  • Page 17: Iadc U.fl Connector

    UG524: xG24 Dev Kit User's Guide Hardware 3.4.10 IADC U.FL Connector The kit features a U.FL connector which is connected to the EFR32MG24 IADC through one of the dedicated ADC input pins (AIN0) in a single-ended configuration. The dedicated ADC inputs facilitate optimal connections between external signals and the IADC.

  • Page 18: Connectors

    UG524: xG24 Dev Kit User's Guide Hardware 3.6 Connectors The xG24 Dev Kit features 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. For additional information on the connectors, see the following sub-sections.

  • Page 19: Breakout Pads

    UG524: xG24 Dev Kit User's Guide Hardware 3.6.1 Breakout Pads Twenty 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 EFR32MG24's features.

  • Page 20: Qwiic Connector

    UG524: xG24 Dev Kit User's Guide Hardware 3.6.2 Qwiic Connector The xG24 Dev Kit features a Qwiic connector compatible with Qwiic Connect System hardware. The Qwiic connector provides an easy way to expand the functionality of the xG24 Dev Kit with sensors, LCDs, and other peripherals over the I C interface.

  • Page 21: Debugging

    UG524: xG24 Dev Kit User's Guide Debugging 4. Debugging The xG24 Dev Kit contains an on-board SEGGER J-Link Debugger that interfaces to the target EFR32MG24 using the Serial Wire De- bug (SWD) interface. The debugger allows the user to download code and debug applications running in the target EFR32MG24. Addi- tionally, it also provides a VCOM port to the host computer that is connected to the target device's serial port for general purpose com- munication between the running application and the host computer.

  • Page 22: On-Board Debugger

    UG524: xG24 Dev Kit 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 EFR32MG24. When the debug USB cable is inserted, the on-board debugger is automatically activated, and takes control of the debug and VCOM interfaces.

  • Page 23: Virtual Com Port

    UG524: xG24 Dev Kit User's Guide Debugging 4.3 Virtual COM Port The virtual COM port (VCOM) is a connection to a UART on the EFR32MG24, 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 24: Radio

    UG524: xG24 Dev Kit User's Guide Radio 5. Radio 5.1 RF Section This section gives a short introduction to the RF section of the BRD2601B board. The schematic of the RF section is shown in the figure below. High 2.4 GHz...

  • Page 25: Antenna

    UG524: xG24 Dev Kit User's Guide Radio 5.1.4 Antenna The BRD2601B 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 datasheet. Due to the fact that there is a significant difference between the layout (practically the board size) of the BRD2601B and the antenna evaluation board, the applied antenna matching network deviates from the recommendation.

  • Page 26: Emc Regulations For 2.4 Ghz

    UG524: xG24 Dev Kit User's Guide Radio 5.2 EMC Regulations for 2.4 GHz 5.2.1 ETSI EN 300-328 Emission Limits for the 2400-2483.5 MHz Band Based on ETSI EN 300-328 the allowed maximum fundamental power for the 2400-2483.5 MHz band is 20 dBm EIRP. For the unwan- ted emissions in the 1 GHz to 12.75 GHz domain the specified limit is -30 dBm EIRP.

  • Page 27: Radiated Power Measurements

    UG524: xG24 Dev Kit User's Guide Radio As it can be observed, the BLE 125 Kb/s coded modulation scheme has the lowest relaxation factors. These values will be used as the worst case relaxation factors for the radiated measurements. 5.4 Radiated Power Measurements The output power of the EFR32MG24 was set to 10 dBm.

  • Page 28: Antenna Pattern Measurement

    UG524: xG24 Dev Kit 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° 0° at X axis Vertical Figure 5.4.
  • Page 29 UG524: xG24 Dev Kit User's Guide Radio Normalized Radiation Pattern [dB], XZ cut 0° 315° 45° 270° 90° 225° 135° Horizontal 180° 0° at Z axis Vertical Figure 5.5. Antenna Pattern - XZ silabs.com | Building a more connected world.

  • Page 30: Emc Compliance Recommendations

    UG524: xG24 Dev Kit User's Guide Radio Normalized Radiation Pattern [dB], YZ cut 0° 315° 45° 270° 90° 225° 135° Horizontal 180° 0° at Z axis 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 EFR32MG24 output power set to 10 dBm, the radiated power of the fundamental of the BRD2601B complies with the 20 dBm limit of the ETSI EN 300-328.

  • Page 31: Schematics, Assembly Drawings, And Bom

    UG524: xG24 Dev Kit 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: silabs.com.

  • Page 32: Kit Revision History And Errata

    UG524: xG24 Dev Kit User's Guide Kit Revision History and Errata 7. Kit Revision History and Errata 7.1 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 Table 7.1 Kit Revision History on page...

  • Page 33: Board Revision History And Errata

    UG524: xG24 Dev Kit 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 33.

  • Page 34: Document Revision History

    UG524: xG24 Dev Kit User's Guide Document Revision History 9. Document Revision History Revision 0.1 April, 2022 • Initial document release. silabs.com | Building a more connected world. Rev. 0.1 | 34...
  • Page 35 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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