Silicon Laboratories UG524 Manuel utilisateur

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.

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™

Table of Contents

1. Introduction ................................

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 EFR32MG24 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 ICS-43434 MEMS Stereo Microphones ....................13

3.4.4 ICM-20689 6-Axis Inertial Sensor ......................14

3.4.5 VEML6035 Ambient Light Sensor ......................15

3.4.6 BMP384 Barometric Pressure Sensor .....................15

3.4.7 External Memory ............................16

3.4.8 Push Buttons and RGB LED ........................16

3.4.9 Precise ADC Voltage Reference ......................16

3.4.10 IADC U.FL Connector..........................17

3.5 On-board Debugger ............................17

3.6 Connectors ...............................18

3.6.1 Breakout Pads ............................19

3.6.2 Qwiic Connector ............................20

3.6.3 Mini Simplicity Connector .........................20

3.6.4 Debug USB Micro-B Connector .......................20

4. Debugging ...............................21

4.1 On-board Debugger ............................22

4.2 External Debugger.............................22

4.2.1 External Debugger Considerations ......................22

4.3 Virtual COM Port .............................23

5. Radio .................................24

5.1 RF Section ...............................24

5.1.1 RF Matching Description .........................24

5.1.2 RF Section Power Supply .........................24

5.1.3 RF Matching Bill of Materials ........................24

silabs.com | Building a more connected world. Rev. 0.1 | 2

5.1.4 Antenna ...............................25

5.1.5 Antenna Matching Bill of Materials ......................25

5.2 EMC Regulations for 2.4 GHz .........................26

5.2.1 ETSI EN 300-328 Emission Limits for the 2400-2483.5 MHz Band ...........26

5.2.2 FCC15.247 Emission Limits for the 2400-2483.5 MHz Band .............26

5.2.3 Applied Emission Limits .........................26

5.3 Relaxation with Modulated Carrier .......................26

5.4 Radiated Power Measurements ........................27

5.4.1 Maximum Radiated Power Measurement ...................27

5.4.2 Antenna Pattern Measurement .......................28

5.5 EMC Compliance Recommendations ......................30

5.5.1 Recommendations for 2.4 GHz ETSI EN 300-328 Compliance ............30

5.5.2 Recommendations for 2.4 GHz FCC 15.247 Compliance ..............30

6. Schematics, Assembly Drawings, and BOM ...................31

7. Kit Revision History and Errata .......................32

7.1 Revision History .............................32

7.2 Errata .................................32

8. Board Revision History and Errata ......................33

8.1 Revision History .............................33

8.2 Errata .................................33

9. Document Revision History .........................34

silabs.com | Building a more connected world. Rev. 0.1 | 3

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

MCU. The peripherals have been grouped into power domains that can be turned on and off by the application code as needed.

Programming the xG24 Dev Kit is easily done using a USB Micro-B cable and the on-board J-Link debugger. A USB virtual COM port

provides a serial connection to the target application, and the Packet Trace Interface (PTI) offers invaluable debug information about

transmitted and received packets in wireless links. Included on the board is a 32 Mbit serial flash that can be used for Over-The-Air

(OTA) firmware upgrade, or as a general purpose non-volatile memory. The xG24 Dev Kit is supported in Simplicity Studio™, and a

Board Support Package (BSP) is provided to give application developers a flying start.

Energy profiling and advanced wireless network analysis and debugging tools are available through the provided Mini Simplicity Con-

nector using an external Silicon Labs debugger.

Connecting external hardware to the xG24 Dev Kit can be done using the 20 breakout pads which present peripherals from the

EFR32MG24 Wireless Gecko such as I2C, SPI, UART, and GPIOs. The breakout pads follow the same pinout as the expansion head-

ers (EXP) on other Silicon Labs Starter Kits. The board also features a Qwiic connector which can be used to connect hardware from

the Qwiic Connect System through I2C.

1.1 Kit Contents

The following items are included in the box:

• 1x MG24 Dev Kit board (BRD2601B)

• 1x USB Type A to Micro-B cable

1.2 Getting Started

Detailed instructions for how to get started with your new xG24 Dev Kit can be found on the Silicon Labs web page:

silabs.com/development-tools

1.3 Hardware Content

The following key hardware elements are included on the xG24 Dev Kit:

• EFR32MG24 Wireless Gecko SoC with 78.0 MHz operating frequency, 1536 kB flash, and 256 kB RAM

• 2.4 GHz ceramic antenna for wireless transmission

• Silicon Labs Si7021 relative humidity and temperature sensor

• Silicon Labs Si7210 hall effect sensor

• TDK InvenSense ICM-20689 6-axis inertial sensor

• Two ICS-43434 MEMS microphones

• Bosch Sensortec BMP384 barometric pressure sensor

• Ambient light sensor (VEML6035)

• Macronix ultra low power 32 Mbit SPI flash (MX25R3235F)

• RGB LED and two push buttons

• U.FL connector and precise external voltage reference for ADC measurements

• Power enable signals and isolation switches for ultra-low power operation

• On-board SEGGER J-Link debugger for easy programming and debugging, which includes a USB virtual COM port and Packet

Trace Interface (PTI)

• Mini Simplicity connector for access to energy profiling and advanced wireless network debugging

• Breakout pads for GPIO access and connection to external hardware

• Qwiic connector for connecting external hardware from the Qwiic Connect System

• Reset button

• Automatic switchover between USB and battery power

• CR2032 coin cell holder and external battery connector

UG524: xG24 Dev Kit User's Guide

Introduction

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1.4 Kit Hardware Layout

xG24 Dev Kit layout is shown below.

Top View Bottom View

Push Buttons

30.4 mm

51.0 mm

Reset Button

20-pin EXP-header

Breakout Pads

U.FL (ADC)

Connector

6-axis

Inertial Sensor

qwiic Header

USB Micro-B Connector

- Virtual COM port

- Debug access

- Packet trace

Hall Effect

Sensor

Humidity and

Temperature Sensor

Mini Simplicity

Connector

Pressure

Sensor

Ambient

Light & UV

Sensor

EFR32MG24

Wireless Gecko

2.4 GHz

Chip Antenna

On-board USB

J-Link Debugger

External

Battery Connector

CR2032 Coin Cell

Holder

Left I2S

Microphone

Right I2S

Microphone

RGB LED

Figure 1.1. xG24 Dev Kit Hardware Layout

UG524: xG24 Dev Kit User's Guide

Introduction

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2. Specifications

2.1 Recommended Operating Conditions

Parameter Symbol Min Typ Max Unit

USB Supply Input Voltage VUSB — 5.0 — V

Battery Supply Input Voltage VVBAT 1.9 3.0 3.6 V

Supply Input Voltage (VMCU supplied externally)1,2,3 VVMCU 1.9 3.3 3.6 V

Operating Temperature TOP — 25 — ˚C

Note:

1. Brightness of the RGB LED will vary with the supply voltage. Due to manufacturing tolerances, functionality is not guaranteed

over the entire working range.

2. To optimize efficiency, EFR32MG24's internal DC-DC converter should be set in BYPASS mode when the input voltage ap-

proaches the output voltage, typically for supply voltages lower than 2.2 V. More details are found in EFR32MG24's data sheet.

3. Not recommended for use with rechargeable Lithium batteries. Most Li-Ion and Li-Po cells exceed 3.6 V when fully charged.

UG524: xG24 Dev Kit User's Guide

Specifications

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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. For a full overview of the conditions that apply for a specific number from a data sheet, the reader is encouraged to read the specif-

ic data sheet.

Table 2.1. Current Consumption

Parameter Symbol Condition Typ Unit

EFR32 Current Consump-

tion1

IEFR32 MCU current consumption in EM0 mode with all peripher-

als disabled (DC-DC converter at 3.0 V input and 1.8 V

output, 39 MHz crystal, CPU running Prime from flash at

25 ˚C)

33.9 µA/MHz

EM4, no BURTC, no LF oscillator 0.25 µA

Radio system current consumption in receive mode, active

packet reception (DC-DC converter at 3.0 V input and 1.8

V output, MCU in EM1 and all MCU peripherals disabled,

HCLK = 39 MHz, 1Mbit/s, 2GFSK, f = 2.4 GHz, VSCALE1

at 25 ˚C)

4.4 mA

Radio system current consumption in transmit mode (DC-

DC converter at 3.0 V input and 1.8 V output, MCU in

EM1P and all MCU peripherals disabled, HCLK = 39 MHz,

f = 2.4 GHz, CW, 10 dBm output power, VSCALE1 at 25

˚C)

20 mA

RH/Temp Sensor Current

Consumption 2

ISi7021 Standby, -40 to +85˚C 0.06 µA

RH conversion in progress 150 µA

Temperature conversion in progress 90 µA

Peak IDD during I2C operations 3.5 mA

Hall Effect Sensor Current

Consumption 3

ISi7210 Sleep mode at 3.3 V 50 µA

Average current for periodic activation at 3.3 V, sleep tim-

er enabled, 200 msec sleep time

0.4 µA

Conversion in progress at 3.3 V 5 mA

Microphone Current Con-

sumption4,5

IMIC Sleep mode, fs less than 3.125 kHz 12 µA

Performance mode (VDD = 1.8 V) 490 µA

IMU Current Consumption 6IIMU Full-chip sleep mode at 1.8 V supply 6 µA

Gyroscope + Accelerometer 6-Axis low power mode, 100

Hz update rate at 1.8 V supply

1.9 mA

External Flash Current Con-

sumption 7

IMX25R3235F Deep Power-down at 1.8 V supply 7 nA

Standy at 1.8 V supply 5 µA

Program current (PP) at 1.8 V supply 3.5 mA

Ambient Light Sensor Cur-

rent Consumption 8

IVEML6035 Shutdown at 1.8 V supply 0.5 µA

Operation mode at 1.8 V supply (ALS only) 170 µA

Pressure Sensor Current

Consumption 9

IBMP384 Sleep current 2 µA

Peak current during pressure measurement 700 µA

Precise Voltage Reference IADC_VREF Enabled at 3.3 V supply 127 µA

UG524: xG24 Dev Kit User's Guide

Specifications

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Parameter Symbol Condition Typ Unit

On-board Debugger Sleep

Current Consumption 10

IDBG On-board debugger current consumption when USB cable

is not inserted (EFM32GG12 EM4S mode current con-

sumption)

80 nA

1 From EFR32MG24 Wireless Gecko SoC data sheet

2 From Si7021-A20 data sheet

3 From Si7210 data sheet

4 From ICS-43434 data sheet

5 Per microphone

6 From ICM-20689 data sheet

7 From MX25R3235F data sheet

8 From VEML6035 data sheet

9 From BMP384 data sheet

10 From EFM32GG12 data sheet

UG524: xG24 Dev Kit User's Guide

Specifications

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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.

3.1 Block Diagram

An overview of the xG24 Dev Kit is illustrated in the figure below.

Memory

Sensors

ADC

Radio

Device Connectivity

Debugging

J-Link

Debugger

USB Micro-B

Connector

2.4 GHz

Antenna

32 Mbit

MX25R

Buttons and LED

EFR32MG24

Wireless SoC

Breakout Pads

(EXP-Header pinout)

Si7021 Si7210

VEML6035

Temperature

& Humidity

Sensor

Ambient

Light

Sensor

Hall Effect

Sensor

ICS-43434 ICM-20689

2x I2S

Microphones

6-axis Inertial

Sensor

BMP384

Pressure

Sensor

User Buttons

& RGB LED

Mini-Simplicity

Connector

Serial Flash

2.4 GHz

Antenna

SMA

Connector

Voltage

Reference

2.4 GHz

Antenna

SMA

Connector

U.FL

Connector

Qwiic

Connector

Figure 3.1. Kit Block Diagram

UG524: xG24 Dev Kit User's Guide

Hardware

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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.

USB Micro-B LDO

5V0

IN OUT

Automatic

Switchover

3V3

VMCU

Battery

EFR32MG24

Wireless SoC

Peripherals

Mini Simplicity

Connector

Figure 3.2. xG24 Dev Kit Power Architecture

Power is normally applied either through the USB cable or a CR2032 battery. A 2-pin 1.25 mm pitch battery connector for external bat-

teries is also available as an alternative to a CR2032 battery. When the USB cable is connected, VBUS is regulated down to 3.3 V. An

automatic switchover circuit switches the main system power from battery power to USB power when the USB cable is inserted, and

protects the battery from reverse current.

Power can also be applied through the Mini Simplicity connector. There must be no other power sources present on the kit as power is

injected directly to the VMCU net. It is important to follow this recommendation to avoid power conflicts and backfeeding the battery.

Powering the xG24 Dev Kit through the Mini Simplicity connector allows current measurements using the Advanced Energy Monitoring

(AEM) as described in section 4.2 External Debugger.

Important: When powering the board through the Mini Simplicity connector, the USB and battery power sources must be removed.

The power supply options are summarized in the table below.

Table 3.1. xG24 Dev Kit Power Options

Supply Mode Typical Input Voltage VMCU Source 3V3 5V

USB power 5.0 V On-board regulator On-board regulator USB VBUS

Battery 3.0 V Battery voltage Disconnected No voltage present

Mini Simplicity 3.3 V Debugger dependent Disconnected No voltage present

3.3 EFR32MG24 Reset

The EFR32MG24 can be reset by a few different sources:

• A user pressing the RESET button.

•The on-board debugger pulling the #RESET pin low.

• An external debugger pulling the #RESET pin low.

UG524: xG24 Dev Kit User's Guide

Hardware

silabs.com | Building a more connected world. Rev. 0.1 | 10

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