Silicon Laboratories BG22 Explorer Kit User manual

UG509: BG22 Explorer Kit User's Guide
The BG22 Explorer Kit is an ultra-low cost, small form factor devel-
opment and evaluation platform for the EFR32BG22 Wireless
Gecko System-on-Chip.
The BG22 Explorer Kit is focused on rapid prototyping and concept creation of IoT appli-
cations. It is designed around the EFR32BG22 SoC, which is an ideal device family for
developing energy-friendly connected IoT applications.
The kit features a USB interface, an on-board SEGGER J-Link debugger, one user-LED
and button, and support for hardware add-on boards via a mikroBus socket and a Qwiic
connector. The hardware add-on support allows developers to create and prototype ap-
plications using a virtually endless combination of off-the-shelf boards from mikroE,
sparkfun, AdaFruit, and Seeed Studios.
TARGET DEVICE
• EFR32BG22 Wireless Gecko System-on-
Chip (EFR32BG22C224F512IM40)
• High performance 2.4 GHz radio
• 32-bit ARM® Cortex®-M33 with 76.8 MHz
maximum operating frequency
• 512 kB flash and 32 kB RAM
KIT FEATURES
• User LED and push button
• 20-pin 2.54 mm breakout pads
•mikroBUS™ socket
• Qwiic® connector
• SEGGER J-Link on-board debugger
• Virtual COM port
• Packet Trace Interface (PTI)
• USB-powered
SOFTWARE SUPPORT
• Simplicity Studio™
ORDERING INFORMATION
• BG22-EK4108A
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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 ............................6
3. Hardware .................................7
3.1 Block Diagram ..............................7
3.2 Power Supply ..............................8
3.3 EFR32BG22 Reset ............................8
3.4 Push Button and LED............................8
3.5 On-board Debugger ............................9
3.6 Connectors ...............................10
3.6.1 Breakout Pads ............................11
3.6.2 MikroBUS Socket ...........................12
3.6.3 Qwiic Connector ............................13
3.6.4 Debug USB Micro-B Connector .......................13
4. Debugging ...............................14
4.1 On-board Debugger ............................14
4.2 Virtual COM Port .............................14
5. Radio .................................15
5.1 RF Section ...............................15
5.1.1 Description of the RF Matching .......................15
5.1.2 RF Section Power Supply .........................15
5.1.3 RF Matching Bill of Materials ........................16
5.1.4 Antenna ...............................16
5.1.5 Antenna Matching Bill of Materials ......................17
5.2 EMC Regulations for 2.4 GHz .........................17
5.2.1 ETSI EN 300-328 Emission Limits for the 2400-2483.5 MHz Band ...........17
5.2.2 FCC15.247 Emission Limits for the 2400-2483.5 MHz Band .............17
5.2.3 Applied Emission Limits .........................17
5.3 Relaxation with Modulated Carrier .......................18
5.4 Radiated Power Measurements ........................18
5.4.1 Maximum Radiated Power Measurement ...................19
5.4.2 Antenna Pattern Measurement .......................20
5.5 EMC Compliance Recommendations ......................22
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5.5.1 Recommendations for 2.4 GHz ETSI EN 300-328 Compliance ............22
5.5.2 Recommendations for 2.4 GHz FCC 15.247 Compliance ..............22
6. Schematics, Assembly Drawings, and BOM ...................23
7. Kit Revision History and Errata .......................24
7.1 Revision History .............................24
7.2 Errata .................................24
8. Board Revision History and Errata ......................25
8.1 Revision History .............................25
8.2 Errata .................................25
9. Document Revision History .........................26
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1. Introduction
The BG22 Explorer Kit has been designed to inspire customers to make IoT devices with the Silicon Labs EFR32BG22 Wireless Gecko
System-on-Chip. The kit includes a mikroBUS™ socket and Qwiic® connector, allowing users to add features to the kit with a large
selection of off-the-shelf boards.
Programming the BG22 Explorer 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. The BG22 Explorer Kit is supported in Simplicity Studio™ and a Board Sup-
port Package (BSP) is provided to give application developers a flying start.
Connecting external hardware to the BG22 Explorer Kit can be done using the 20 breakout pads which present peripherals from the
EFR32BG22 Wireless Gecko such as I2C, SPI, UART and GPIOs. The mikroBUS socket allows inserting mikroBUS add-on boards
which interface with the EFR32BG22 through SPI, UART or I2C. The Qwiic connector 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 BG22 Explorer Kit board (BRD4108A)
1.2 Getting Started
Detailed instructions for how to get started with your new BG22 Explorer Kit can be found on the Silicon Labs web page:
https://www.silabs.com/dev-tools
1.3 Hardware Content
The following key hardware elements are included on the BG22 Explorer Kit:
• EFR32BG22 Wireless Gecko SoC with 76.8 MHz operating frequency, 512 kB kB flash, and 32 kB RAM
• 2.4 GHz matching network and ceramic antenna for wireless transmission
• One LED and one push button
• On-board SEGGER J-Link debugger for easy programming and debugging, which includes a USB virtual COM port and Packet
Trace Interface (PTI)
• MikroBUS socket for connecting click boards™ and other mikroBUS add-on boards
• Qwiic connector for connecting Qwiic Connect System hardware
• Breakout pads for GPIO access and connection to external hardware
• Reset button
UG509: BG22 Explorer Kit User's Guide
Introduction
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1.4 Kit Hardware Layout
BG22 Explorer Kit layout is shown below.
Top View
Push Button
35.6 mm
55.9 mm
Reset Button
Breakout Pads
USB Micro-B Connector
- Virtual COM port
- Debug access
- Packet trace
LED
Qwiic
Connector
On-board USB
J-Link Debugger
mikroBUS Socket
EFR32BG22
Wireless Gecko
2.4 GHz
Chip Antenna
Figure 1.1. BG22 Explorer Kit Hardware Layout
UG509: BG22 Explorer 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
Supply Input Voltage (VMCU supplied externally) VVMCU +3.31V
Operating Temperature TOP – +20 – ˚C
Note: 1The typical supply voltage to the EFR32BG22 is 3.0 V, but the maximum voltage is a function of temperature and average life-
time current load. Over a 10-year lifespan, the average lifetime current load should not exceed 60 mA when the supply voltage is 3.3 V.
See the EFR32BG22 data sheet for more information.
2.2 Current Consumption
The operating current of the board greatly depends on the application and the amount of external hardware connected. The table below
attempts to give some indication of typical current consumptions for the EFR32BG22 and the on-board debugger. Note that the num-
bers are taken from the data sheets for the devices. For a full overview of the conditions that apply for a specific number from a data
sheet, the reader is encouraged to read the specific data sheet.
Table 2.1. Current Consumption
Parameter Symbol Condition Typ Unit
EFR32BG22 Current Con-
sumption1
IBG22 MCU current consumption in EM0 mode with all peripher-
als disabled (module supply voltage = 3.0 V, VSCALE2,
38.4 MHz crystal, CPU running Prime from flash at 25 °C)
28 µA/MHz
Radio system current consumption in receive mode, active
packet reception (VDD = 3.0 V, MCU in EM1 and all MCU
peripherals disabled, HCLK = 38.4 MHz, 1Mbit/s, 2GFSK,
f = 2.4 GHz at 25 °C)
3.8 mA
Radio system current consumption in transmit mode (VDD
= 3.0 V, MCU in EM1 and all MCU peripherals disabled,
HCLK = 38.4 MHz, f = 2.4 GHz, CW, 6 dBm output power
at 25 °C)
8.4 mA
On-board Debugger Sleep
Current Consumption 2
IDBG On-board debugger current consumption when USB cable
is not inserted (EFM32GG12 EM4S mode current con-
sumption)
80 nA
1 From EFR32BG22 data sheet
2From EFM32GG12 data sheet
UG509: BG22 Explorer Kit User's Guide
Specifications
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3. Hardware
The core of the BG22 Explorer Kit is the EFR32BG22 Wireless Gecko System-on-Chip. Refer to section 1.4 Kit Hardware Layout for
placement and layout of the hardware components.
3.1 Block Diagram
An overview of the BG22 Explorer Kit is illustrated in the figure below.
Memory
Radio
Device Connectivity & Debugging
J-Link
Debugger
USB Micro-B
Connector
2.4 GHz
Antenna
8 Mbit
MX25R
Button and LED
EFR32BG22
Wireless SoC
Breakout Pads
(EXP-Header pinout)
Expandability
Qwiic
Connector
mikroBUS
Socket
User Button
& LED
Mini-Simplicity
Connector
Serial Flash
Figure 3.1. Kit Block Diagram
UG509: BG22 Explorer Kit User's Guide
Hardware
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3.2 Power Supply
The kit is powered by the debug USB cable as illustrated in the figure below.
USB Micro-B LDO
5V0
IN OUT
Automatic
Isolation
3V3
VMCU
EFR32BG22
Wireless SoC
Peripherals
Peripherals
Peripherals
Peripherals
Figure 3.2. BG22 Explorer Kit Power Topology
The 5 V power net on the USB bus is regulated down to 3.3 V using an low-dropout regulator (LDO). An automatic isolation circuit
isolates the LDO when the USB cable is not plugged in.
Power can be injected externally on the VMCU net if the USB cable is removed and no other power sources are present on the kit.
Failure to follow this guideline can cause power conflicts and damage the LDO.
3.3 EFR32BG22 Reset
The EFR32BG22 can be reset by a few different sources:
• A user pressing the RESET button.
• The on-board debugger pulling the #RESET pin low.
3.4 Push Button and LED
The kit has one user push button, marked LED0, that is connected to a GPIO on the EFR32BG22. The button is connected to pin PC07
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.
The kit also features one yellow LED, marked LED0, that is controlled by a GPIO pin on the EFR32BG22. The LED is connected to pin
PA04 in an active-high configuration.
EFR32BG22
EFR32_LED0
EFR32_BUTTON0
User
Button & LED
PC07 (GPIO.EM4WU8)
PA04 (GPIO)
Figure 3.3. Button and LED
UG509: BG22 Explorer Kit User's Guide
Hardware
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3.5 On-board Debugger
The BG22 Explorer Kit 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 pro-
grammable by the user. When the USB cable is removed, the on-board debugger goes into a very low power shutoff mode (EM4S),
consuming around 80 nA typically (EFM32GG12 data sheet number).
In addition to providing code download and debug features, the on-board debugger also presents a virtual COM port for general pur-
pose application serial data transfer. The Packet Trace Interface (PTI) is also supported which offers invaluable debug information
about transmitted and received packets in wireless links.
The figure below shows the connections between the target EFR32BG22 device and the on-board debugger.
Refer to chapter 4. Debugging for more details on debugging.
EFR32MG
EFR32BG22
PA01 (GPIO.SWCLK)
PA02 (GPIO.SWDIO)
PA03 (GPIO.SWV)
PA05 (USART1.TX)
PA06 (USART1.RX)
PA07 (USART1.RTS)
PA08 (USART1.CTS)
DBG_VCOM_TX
DBG_VCOM_RX
DBG_VCOM_CTS
DBG_VCOM_RTS
DBG_SWCLK
DBG_SWDIO
DBG_SWO
On-Board
J-Link
Debugger
Host
PC USB
DBG_PTI_DATA PC04 (FRC.DOUT)
PC05 (FRC.DFRAME)
DBG_PTI_FRAME
DBG_RESET RESETn
Figure 3.4. On-Board Debugger Connections
UG509: BG22 Explorer Kit User's Guide
Hardware
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3.6 Connectors
The BG22 Explorer Kit features a USB Micro-B connector, 20 breakout pads, a mikroBUS connector for connecting mikroBUS add-on
boards, and a Qwiic connector for connecting Qwiic Connect System hardware. The connectors are placed on the top side of the board,
and their placement and pinout are shown in the figure below. For additional information on the connectors, see the following sub chap-
ters.
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
PA4
RST
PA0
Breakout Pads
mikroBUS
Connector
USB Micro-B
Connector
J1 J2
J202
J201
GND
5V
PC7
PD3 - MIKROE_QWIIC_I2C_SDA
PD2 - MIKROE_QWIIC_I2C_SCL
PB1 - MIKROE_UART_TX
PB2 - MIKROE_UART_RX
PB3 - MIKROE_INT
PB4 - MIKROE_PWM
GND
VMCU
PC0 - MIKROE_SPI_MOSI
PC1 - MIKROE_SPI_MISO
PC2 - MIKROE_SPI_SCK
PC3 - MIKROE_SPI_CS
PC6 - MIKROE_RST
PB0 - MIKROE_ANALOG
Qwiic
Connector
P202
P900
Figure 3.5. BG22 Explorer Kit Connectors
UG509: BG22 Explorer Kit User's Guide
Hardware
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