SLTB004A

UG309: Thunderboard Sense 2 User's Guide The Thunderboard™ Sense 2 is the ultimate multi-sensor, multiprotocol cloud inspiration kit. The board is a small and cost effective, feature rich, prototype and development platform based on the EFR32™ Mighty Gecko Wireless System-on-Chip. The Thunderboard Sense 2 is an ideal platform for developing energy-friendly connected IoT devices. This is a true multi-protocol capable kit, supporting proprietary stacks and standard protocols such as Zigbee, Thread and Bluetooth® low energy. KEY POINTS • EFR32MG12 Mighty Gecko Wireless SoC with 38.4 MHz operating frequency, 1024 kB flash and 256 kB RAM • 2.4 GHz ceramic chip antenna • Fine grained power-control for ultra low power operation The Thunderboard Sense 2 ships with a ready to use Bluetooth demo that works with a cloud connected smartphone app, showcasing easy collection of environmental and motion sensor data. • Seven sensors and four high brightness controllable RGB LEDs A built in SEGGER J-Link debugger ensures easy customization and development. • 8-Mbit flash for OTA programming and data logging • User LEDs/pushbuttons • SEGGER J-Link on-board debugger • Virtual COM port • Mini Simplicity connector for AEM and packet trace using external Silicon Labs debugger • 20-pin 2.54 mm breakout pads • Power sources include USB, coin cell and external batteries ON-BOARD SENSORS • Relative humidity and temperature sensor • UV index and ambient light sensor • Hall effect sensor • Indoor air quality gas sensor • 6-axis inertial sensor • Barometric pressure sensor • MEMS microphone SOFTWARE SUPPORT • Simplicity Studio™ • Energy Profiler • Network Analyzer silabs.com | Building a more connected world. Rev. 1.00 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1 Kit Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Hardware Content . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.3 Kit Hardware Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . 6 2.3 Current Consumption . . . . . . . . . . . . . . . . . . . . . . 7 . . . . . . . 3. Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.1 Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3.2 Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 3.3 EFR32MG12 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 3.4 Sensors and RGB LEDs . . . . . . . . . . . 3.4.1 Si7021 Relative Humidity and Temperature Sensor 3.4.2 Si1133 UV Index and Ambient Light Sensor . . . 3.4.3 BMP280 Barometric Pressure Sensor . . . . . 3.4.4 Si7210 Hall Effect Sensor . . . . . . . . . 3.4.5 CCS811 Indoor Air Quality Gas Sensor . . . . 3.4.6 ICM-20648 6-Axis Inertial Sensor . . . . . . 3.4.7 ICS-43434 MEMS Microphone . . . . . . . 3.4.8 RGB LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 .13 .13 .14 .14 .15 .16 .17 .18 3.5 Push Buttons and RG LED . . . . . . . . . . . . . . . . . . . . . . . . .19 3.6 Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19 3.7 On-board Debugger . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 .22 .23 .23 .23 4. Debugging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 3.8 Connectors . . . . . . . 3.8.1 Breakout Pads . . . 3.8.2 Mini Simplicity Connector 3.8.3 USB Micro-B Connector 3.8.4 Battery Connector . . 4.1 On-board Debugger Considerations . . . . . . . . . . . . . . . . . . . . . .24 4.2 Virtual COM Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25 4.3 Mini Simplicity Connector . . . . . . . . . . . . . . . . . . . . . . . . . .25 5. Radio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.1 RF Section . . . . . . . . . 5.1.1 Description of the RF Matching 5.1.2 RF Section Power Supply . . 5.1.3 RF Matching Bill of Materials . 5.1.4 Antenna . . . . . . . . silabs.com | Building a more connected world. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26 .26 .26 .26 .27 Rev. 1.00 | 2 5.1.5 Antenna Matching Bill of Materials . . . . . . . . . . . . . .27 5.2 EMC Regulations for 2.4 GHz . . . . . . . . . . . . . . 5.2.1 ETSI EN 300-328 Emission Limits for the 2400-2483.5 MHz Band 5.2.2 FCC15.247 Emission Limits for the 2400-2483.5 MHz Band . . 5.2.3 Applied Emission Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28 .28 .28 .28 5.3 Radiated Power Measurements . . . . . . 5.3.1 Maximum Radiated Power Measurement 5.3.2 Antenna Pattern Measurement . . . . . . . . . . . . . . . . . . . . . . . .29 .29 .30 5.4 EMC Compliance Recommendations . . . . . . . . . . . 5.4.1 Recommendations for 2.4 GHz ETSI EN 300-328 Compliance 5.4.2 Recommendations for 2.4 GHz FCC 15.247 Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32 .32 .32 6. Schematics, Assembly Drawings and BOM . . . . . . . . . . . . . . . . . . . 33 7. Kit Revision History and Errata . . . . . . . . . . . . . . . . . . . . . . . 34 . . .34 8. Board Revision History and Errata . . . . . . . . . . . . . . . . . . . . . . 35 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1 Revision History . . . . . . . . . . . . . . . . 8.1 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 8.2 Errata . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 9. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . 36 . . . . silabs.com | Building a more connected world. Rev. 1.00 | 3 UG309: Thunderboard Sense 2 User's Guide Introduction 1. Introduction The Thunderboard Sense 2 (OPN: SLTB004A) has been designed to inspire customers to make battery operated IoT devices with the Silicon Labs EFR32MG12 Mighty Gecko Wireless System-on-Chip. The highlights of the board include seven different environmental sensors and four high brightness RGB LEDs accessible to the EFR32MG12 wireless MCU. The sensors and LEDs have been grouped into power domains that can be turned on and off by the application code as needed. By default, the board starts up in the lowest power operating mode, with all sensors disabled. Programming the Thunderboard Sense 2 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. Included on the board is an 8 Mbit serial flash that can be used for Over-The-Air (OTA) firmware upgrade, or as a general purpose non-volatile memory. The Thunderboard Sense 2 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 Connector using an external Silicon Labs debugger. See AN958 for more information about debugging and programming interfaces that can be used with Silicon Labs' starter kits. Connecting external hardware to the Thunderboard Sense 2 can be done using the 20 breakout pads which present peripherals from the EFR32MG12 Mighty Gecko such as I2C, SPI, UART and GPIOs. The breakout pads follow the same pinout as the expansion headers (EXP) on other Silicon Labs Starter Kits. Figure 1.1. Thunderboard Sense 2 1.1 Kit Contents The following items are included in the box: • 1x Thunderboard Sense 2 board (BRD4166A) silabs.com | Building a more connected world. Rev. 1.00 | 4 UG309: Thunderboard Sense 2 User's Guide Introduction 1.2 Hardware Content The following key hardware elements are included on the Thunderboard Sense 2: • EFR32MG12 Mighty Gecko Wireless SoC with 38.4 MHz operating frequency, 1024 kB flash and 256 kB RAM • 2.4 GHz ceramic antenna for wireless transmission • Silicon Labs Si7021 relative humidity and temperature sensor • Silicon Labs Si1133 UV index and ambient light sensor • Silicon Labs Si7210 hall effect sensor • Bosch Sensortec BMP280 barometric pressure sensor • ams CCS811 indoor air quality gas sensor • TDK InvenSense ICM-20648 6-axis inertial sensor • TDK InvenSense ICS-43434 MEMS microphone • Four high brightness RGB LEDs from Broadcom Limited (ASMT-YTB7-0AA02) • One bi-color LED and two push buttons • Power enable signals for fine grained power-control • Macronix ultra low power 8-Mbit SPI flash (MX25R8035F) • On-board SEGGER J-Link debugger for easy programming and debugging, which includes a USB virtual COM port • Mini Simplicity connector for access to energy profiling and advanced wireless network debugging • Breakout pads for GPIO access and connection to external hardware • Reset button • Automatic switchover between USB and battery power • CR2032 coin cell holder and external battery connector 1.3 Kit Hardware Layout The layout of the Thunderboard Sense 2 is shown below. RGB LED 1 Si7210 Hall Effect Sensor 2.4 GHz Chip Antenna EFR32MG12 Mighty Gecko 30 mm RGB LED 2 Top View Bottom View Acoustic hole BMP280 Pressure Sensor ICS-43434 MEMS Microphone Si1133 Ambient Light & UV On-board USB Sensor J-Link Debugger Mini-Simplicity Connector External Battery Connector CCS811 Indoor Air Quality Sensor 20-pin EXP-header Breakout Pads ICM-20648 6-axis Inertial Sensor 45 mm Si7021 Humidity and Temperature Sensor Reset Button RGB LED 0 Push Button 1 Push Button 0 USB Micro-B Connector - Virtual COM port - Debug access CR2032 Coin Cell Holder RGB LED 3 Figure 1.2. Thunderboard Sense 2 Hardware Layout silabs.com | Building a more connected world. Rev. 1.00 | 5 UG309: Thunderboard Sense 2 User's Guide Specifications 2. Specifications 2.1 Absolute Maximum Ratings Parameter Symbol Min USB Input Voltage VUSB-MAX Battery Input Voltage (VMCU) VBAT-MAX LDO output current IVREG-LOAD Voltage on any I/O breakout pad VDIGPIN Current per I/O pin (sink) Typ Max Unit 0 +5.5 V 0 +3.6 V 300 mA VMCU+0.3 V IIOMAX 50 mA Current per I/O pin (source) IIOMAX 50 mA Current for all I/O pins (sink) IIOALLMAX 200 mA Current for all I/O pins (source) IIOALLMAX 200 mA ESD Susceptibility HBM (Human Body Model) VESD 2 kV -0.3 2.2 Recommended Operating Conditions Parameter Symbol Min Typ Max Unit USB Supply Input Voltage VUSB +4.5 +5.0 +5.5 V Battery Supply Input Voltage VVBAT +2.0 +3.3 V Supply Input Voltage (VMCU supplied externally) VVMCU +2.0 +3.3 V Operating Temperature 1 TOP -35 85 ˚C 1 Using the CCS811 gas sensor limits the operating temperature range from -5 to 50 ˚C. silabs.com | Building a more connected world. Rev. 1.00 | 6 UG309: Thunderboard Sense 2 User's Guide Specifications 2.3 Current Consumption 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. The table below attempts to give some indication of how different features of the board contribute to the overall power consumption. Please note that some numbers are measured values, while others are taken from the datasheets for the devices. For a full overview of the conditions that apply for a specific number from a datasheet, the reader is encouraged to read the specific datasheet. Table 2.1. Current Consumption Parameter EFR32 Current Consumption 1 UV/ALS Current Consumption 2 RH/Temp Sensor Current Consumption 3 Barometric Pressure Sensor Current Consumption 4 Microphone Current Consumption5 CCS811 Current Consumption 6 IMU Current Consumption 7 RGB LED Current Consumption 8 Symbol IEFR32 ISi1133 ISi7021 Condition ICCS811 IIMU IRGB Max Unit 3.4 mA Radio in receive mode. 10 mA Radio transmitter active @ 8 dBm 26 mA Standby 0.125 µA ADC Conversion in Progress 0.525 µA Responding to commands and calculating results 4.5 mA Standby, -40 to +85˚C 0.06 0.62 µA RH conversion in progress 150 180 µA Temperature conversion in progress 90 120 µA Peak IDD during I2C operations 3.5 4.0 mA 0.1 0.3 µA 1 Hz forced mode, pressure & temperature, lowest power 2.8 4.2 µA Peak current during pressure measurement 0.72 1.12 mA Current at temperature measurement 0.33 mA Sleep mode current (fs