EFR32MG 2.4 GHz 13 dBm Radio Board BRD4153A Reference Manual The EFR32MG family of Wireless SoCs deliver a high performance, low energy wireless solution integrated into a small form factor package. By combining a high performance 2.4 GHz RF transceiver with an energy efficient 32-bit MCU, the family provides designers the ultimate in flexibility with a family of pin-compatible devices that scale from 128/256 kB of flash and 16/32 kB of RAM. The ultra-low power operating modes and fast wake-up times of the Silicon Labs energy friendly 32bit MCUs, combined with the low transmit and receive power consumption of the 2.4 GHz radio, result in a solution optimized for battery powered applications. To develop and/or evaluate the EFR32 Mighty Gecko, the EFR32MG Radio Board can be connected to the Wireless Starter Kit Mainboard to get access to display, buttons and additional features from Expansion Boards. silabs.com | Smart. Connected. Energy-friendly. RADIO BOARD FEATURES • Wireless SoC: EFR32MG1P132F256GM48 • CPU core: ARM Cortex-M4 with FPU • Flash memory: 256 kB • RAM: 32 kB • Operation frequency: 2.4 GHz • Transmit power: 13 dBm • Integrated PCB antenna, UFL connector (optional). • Crystals for LFXO and HFXO: 32.768 kHz and 38.4 MHz. Rev. 1.6 BRD4153A Reference Manual Introduction 1. Introduction The EFR32 Mighty Gecko Radio Boards provide a development platform (together with the Wireless Starter Kit Mainboard) for the Silicon Labs EFR32 Mighty Gecko Wireless System on Chips and serve as reference designs for the matching network of the RF interface. The BRD4153A Radio Board is designed to operate in the 2400-2483.5 MHz band with the RF matching network optimized to operate with 13 dBm output power. To develop and/or evaluate the EFR32 Mighty Gecko, the BRD4153A Radio Board can be connected to the Wireless Starter Kit Mainboard to get access to display, buttons and additional features from Expansion Boards and also to evaluate the performance of the RF interface. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 1 BRD4153A Reference Manual Radio Board Connector 2. Radio Board Connector 2.1 Introduction The board-to-board connector scheme allows access to all EFR32MG1 GPIO pins as well as the RESETn signal. For more information on the functions of the available pin functions, see the EFR32MG1 data sheet. 2.2 Radio Board Connector Pin Associations The figure below shows the pin mapping on the connector to the radio pins and their function on the Wireless Starter Kit Mainboard. P200 Upper Row 3v3 UIF_BUTTON1 / PF7 / P36 NC / P38 NC / P40 NC / P42 NC / P44 DEBUG.TMS_SWDIO / PF1 / F0 DEBUG.TDO_SWO / PF2 / F2 #RESET / F4 VCOM.TX_MOSI / PA0 / F6 VCOM.#CTS_SCLK / PA2 / F8 DISP_EXTCOMIN / PD13 / F10 UIF_BUTTON0 / PF6 / F12 DISP_ENABLE / PD15 / F14 DISP_SI / PC6 / F16 DISP_EXTCOMIN / PD13 / F18 PTI.DATA / PB12 / F20 USB_VBUS 5V Board ID SCL P201 Lower Row GND GND VCOM.#CTS_SCLK / PA2 / P0 P37 / High / SENSOR_ENABLE VCOM.#RTS_#CS / PA3 / P2 P39 / NC PD10 / P4 P41 / NC PD11 / P6 P43 / NC P45 / NC PD12 / P8 F1 / PF0 / DEBUG.TCK_SWCLK DEBUG.TDI / PF3 / P10 F3 / PF3 / DEBUG.TDI PC10 / P12 F5 / PA5 / VCOM_ENABLE PA4 / P14 F7 / PA1 / VCOM.RX_MISO VCOM_ENABLE / PA5 / P16 F9 / PA3 / VCOM.#RTS_#CS PTI.CLK / PB11 / P18 F11 / PF5 / UIF_LED1 PTI.DATA / PB12 / P20 F13 / PF7 / UIF_BUTTON1 PTI.SYNC / PB13 / P22 F15 / PC8 / DISP_SCLK DEBUG.TCK_SWCLK / PF0 / P24 F17 / PD14 / DISP_SCS DEBUG.TMS_SWDIO / PF1 / P26 F19 / PB13 / PTI.SYNC DEBUG.TDO_SWO / PF2 / P28 F21 / PB11 / PTI.CLK UIF_LED0 / PF4 / P30 USB_VREG UIF_LED1 / PF5 / P32 GND UIF_BUTTON0 / PF6 / P34 GND Board ID SDA VMCU_IN P1 / PC6 / DISP_SI P3 / PC7 P5 / PC8 / DISP_SCLK P7 / PC9 P9 / PA0 / VCOM.TX_MOSI P11 / PA1 / VCOM.RX_MISO P13 / PC11 P15 / NC P17 / NC P19 / NC P21 / NC P23 / NC P25 / NC P27 / NC P29 / NC P31 / PD13 / DISP_EXTCOMIN P33 / PD14 / DISP_SCS P35 / PD15 / DISP_ENABLE VRF_IN Figure 2.1. BRD4153A Radio Board Connector Pin Mapping silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 2 BRD4153A Reference Manual Radio Board Block Summary 3. Radio Board Block Summary 3.1 Introduction This section gives a short introduction to the blocks of the BRD4153A Radio Board. 3.2 Radio Board Block Diagram The block diagram of the EFR32MG Radio Board is shown in the figure below. I2C UFL Connector 2.4 GHz RF GPIO UART Debug EFR32 EFR32 Wireless SoC AEM Packet Trace 2.4 GHz RF Inverted-F PCB Antenna SPI SPI I2C Radio Board Connectors 2.4 GHz RF Matching Network & Path Selection 24AA0024 8 Mbit MX25R Serial EEPROM Serial Flash 32 .76 8k LF Crystal .4M 38 HF Crystal Figure 3.1. BRD4153A Block Diagram 3.3 Radio Board Block Description 3.3.1 Wireless MCU The BRD4153A EFR32 Mighty Gecko Radio Board incorporates an EFR32MG1P132F256GM48 Wireless System on Chip featuring 32-bit Cortex-M4 with FPU core, 256 kB of flash memory and 32 kB of RAM and a 2.4 GHz band transceiver with output power up to 16.5 dBm. For additional information on the EFR32MG1P132F256GM48, refer to the EFR32MG1 Data Sheet. 3.3.2 LF Crystal Oscillator (LFXO) The BRD4153A Radio Board has a 32.768 kHz crystal mounted. 3.3.3 HF Crystal Oscillator (HFXO) The BRD4153A Radio Board has a 38.4 MHz crystal mounted. 3.3.4 Matching Network for 2.4 GHz The BRD4153A Radio Board incorporates a 2.4 GHz matching network which connects the 2.4 GHz TRX pin of the EFR32MG1 to the one on-board printed Inverted-F antenna. The component values were optimized for the 2.4 GHz band RF performace and current consumption with 13 dBm output power. For detailed description of the matching network, see Chapter 4.2.1 Description of the 2.4 GHz RF Matching. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 3 BRD4153A Reference Manual Radio Board Block Summary 3.3.5 Inverted-F Antenna The BRD4153A Radio Board includes a printed Inverted-F antenna (IFA) tuned to have close to 50 Ohm impedance at the 2.4 GHz band. For detailed description of the antenna see Chapter 4.5 Inverted-F Antenna. 3.3.6 UFL Connector To be able to perform conducted measurements, Silicon Labs added an UFL connector to the Radio Board. The connector allows an external 50 Ohm cable or antenna to be connected during design verification or testing. Note: By default the output of the matching network is connected to the printed Inverted-F antenna by a series component. It can be connected to the UFL connector as well through a series 0 Ohm resistor which is not mounted by default. For conducted measurements through the UFL connector the series component to the antenna should be removed and the 0 Ohm resistor should be mounted (see Chapter 4.2 Schematic of the RF Matching Network for further details). 3.3.7 Radio Board Connectors Two dual-row, 0.05” pitch polarized connectors make up the EFR32MG Radio Board interface to the Wireless Starter Kit Mainboard. For more information on the pin mapping between the EFR32MG1P132F256GM48 and the Radio Board Connector, refer to Chapter 2.2 Radio Board Connector Pin Associations. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 4 BRD4153A Reference Manual RF Section 4. RF Section 4.1 Introduction This section gives a short introduction to the RF section of the BRD4153A. 4.2 Schematic of the RF Matching Network The schematic of the RF section of the BRD4153A Radio Board is shown in the following figure. 2.4 GHz Matching & Filtering Network U1B RF Crystal 10 HFXTAL_N HFXI L2 L1 RF I/O 2G4RF_IOP Path Selection & Harmonic Suppression Inverted-F Antenna AT1 C3 17 C1 C2 INVERTED_F Supply Filtering RFVDD L102 11 HFXTAL_P HFXO RF Analog Power 1 2 BLM18AG601SN1 9 C102 C103 100P 10P PAVDD 2G4RF_ION R2 0R NM Ground RFVDD RFVSS L103 16 14 GND P1 3 PA Power 1 2 BLM18AG601SN1 18 C106 220N GND PAVDD PAVSS 15 1 2 C107 U.FL 10P GND GND GND Test Connector Figure 4.1. Schematic of the RF Section of the BRD4153A 4.2.1 Description of the 2.4 GHz RF Matching The 2.4 GHz matching connects the 2G4RF_IOP pin to the on-board printed Inverted-F Antenna. The 2G4RF_ION pin is connected to ground. For higher output powers (13 dBm and above), besides the impedance matching circuitry, it is recommended to use additional harmonic filtering as well at the RF output. The targeted output power of the BRD4153A board is 13 dBm. Therefore, the RF output of the IC is connected to the antenna through a four-element impedance matching and harmonic filter circuitry. For conducted measurements the output of the matching network can also be connected to the UFL connector by removing the series C3 capacitor between the antenna and the output of the matching and adding a 0 Ohm resistor to the R2 resistor position between the output of the matching and the UFL connector. 4.3 RF Section Power Supply On the BRD4153A Radio Board the power supply pins of the RF section (RFVDD, PAVDD) are directly connected to the output of the on-chip DC-DC converter. This way, by default, the DC-DC converter provides 1.8 V for the entire RF section (for details, see the schematic of the BRD4153A). 4.4 Bill of Materials for the 2.4 GHz Matching The Bill of Materials of the 2.4 GHz matching network of the BRD4153A Radio Board is shown in the following table. Table 4.1. Bill of Materials for the BRD4153A 2.4 GHz 13 dBm RF Matching Network Component name Value Manufacturer Part Number C1 2.0 pF Murata GRM1555C1H2R0WA01 C2 1.0 pF Murata GRM1555C1H1R0WA01 L1 1.8 nH Murata LQP15MN1N8W02 L2 3.0 nH Murata LQP15MN3N0W00 silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 5 BRD4153A Reference Manual RF Section 4.5 Inverted-F Antenna The BRD4153A Radio Board includes an on-board printed Inverted-F Antenna tuned for the 2.4 GHz band. Due to the design restrictions of the Radio Board, the input of the antenna and the output of the matching network can't be placed directly next to each other. Therefore, a 50 Ohm transmission line was necessary to connect them. With the actual line length, the impedance of the antenna at the double-harmonic frequency is transformed closer to a "critical load impedance range", which increases the radiated level of the harmonic. To reduce the harmonic radiation a tuning component was used instead of a series 0 Ohm resistor between the matching network output and the antenna input. For the actual Radio Board design (with the actual transmission line length) a small value capacitor was used (C3 capacitor with value of 3.9 pF) to transform the impedance at the double-frequency harmonic away from the critical region while keeping the impedance at the fundamental close to 50 Ohm. With this the suppression of the radiated double-frequency, harmonic increases by approximately. 5 dB. The resulting impedance and reflection are shown in the following figure. Figure 4.2. Impedance and Reflection of the Inverted-F Antenna of the BRD4153A silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 6 BRD4153A Reference Manual Mechanical Details 5. Mechanical Details The BRD4153A EFR32 Mighty Gecko Radio Board is illustrated in the figures below. DC-DC Inductor DC-DC & Supply Filter Caps. EFR32xx 30 mm OTA Flash Frame of the Optional Shielding Can 45 mm Figure 5.1. BRD4153A Top View 5 mm 24 mm Board Identification P 200 P 201 15 mm 27.3 mm 28.6 mm WSTK Sensor Enable Selection Interface Connector Interface Connector Figure 5.2. BRD4153A Bottom View silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 7 BRD4153A Reference Manual EMC Compliance 6. EMC Compliance 6.2 EMC Regulations for 2.4 GHz 6.2.1 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 unwanted emissions in the 1 GHz to 12.75 GHz domain the specified limit is -30 dBm EIRP. 6.2.2 FCC15.247 Emission Limits for the 2400-2483.5 MHz Band FCC 15.247 allows conducted output power up to 1 Watt (30 dBm) in the 2400-2483.5 MHz band. For spurious emmissions the limit is -20 dBc based on either conducted or radiated measurement, if the emission is not in a restricted band. The restricted bands are specified in FCC 15.205. In these bands the spurious emission levels must meet the levels set out in FCC 15.209. In the range from 960 MHz to the frequency of the 5th harmonic it is defined as 0.5 mV/m at 3 m distance (equals to -41.2 dBm in EIRP). Additionally, for spurious frequencies above 1 GHz, FCC 15.35 allows duty-cycle relaxation to the regulatory limits. For the EmberZNet PRO the relaxation is 3.6 dB. Therefore, the -41.2 dBm limit can be modified to -37.6 dBm. If operating in the 2400-2483.5 MHz band the 2nd, 3rd and 5th harmonics can fall into restricted bands. As a result, for those the -37.6 dBm limit should be applied. For the 4th harmonic the -20 dBc limit should be applied. 6.2.3 Applied Emission Limits for the 2.4 GHz Band The above ETSI limits are applied both for conducted and radiated measurements. The FCC restricted band limits are radiated limits only. Besides that, Silicon Labs applies those to the conducted spectrum i.e., it is assumed that, in case of a custom board, an antenna is used which has 0 dB gain at the fundamental and the harmonic frequencies. In that theoretical case, based on the conducted measurement, the compliance with the radiated limits can be estimated. The overall applied limits are shown in the table below. Table 6.1. Applied Limits for Spurious Emissions for the 2.4 GHz Band Harmonic Frequency Limit 2nd 4800~4967 MHz -37.6 dBm 3rd 7200~7450.5 MHz -37.6 dBm 4th 9600~9934 MHz -30 dBm 5th 12000~12417.5 MHz -37.6 dBm silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 8 BRD4153A Reference Manual RF Performance 7. RF Performance 7.1 Conducted Power Measurements During measurements, the EFR32MG Radio Board was attached to a Wireless Starter Kit Mainboard which was supplied by USB. The voltage supply for the Radio Board was 3.3 V. 7.1.1 Conducted Measurements in the 2.4 GHz band The BRD4153A board was connected directly to a Spectrum Analyzer through its UFL connector (the C3 capacitor was removed and a 0 Ohm resistor was soldered to the R2 resistor position). During measurements, the voltage supply for the board was 3.3 V provided by the mainboard. The supply for the RF section was 1.8 V provided by the on-chip DC-DC converter (for details, see the schematic of the BRD4153A). The transceiver was operated in continuous carrier transmission mode. The output power of the radio was set to 13 dBm. The typical output spectrum is shown in the following figure. Figure 7.1. Typical Output Spectrum of the BRD4153A As it can be observed, the fundamental is slightly lower than 13 dBm limit and the strongest unwanted emission is the double-frequency harmonic and it is under the -37.6 dBm applied limit. Note: The conducted measurement is performed by connecting the on-board UFL connector to a Spectrum Analyzer through an SMA Conversion Adapter (P/N: HRMJ-U.FLP(40)). This connection itself introduces approximately 0.3 dB insertion loss. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 9 BRD4153A Reference Manual RF Performance 7.2 Radiated Power Measurements During measurements, the EFR32MG Radio Board was attached to a Wireless Starter Kit Mainboard which was supplied by USB. The voltage supply for the Radio Board was 3.3 V. The radiated power was measured in an antenna chamber by rotating the DUT 360 degrees with horizontal and vertical reference antenna polarizations in the XY, XZ and YZ cuts. The measurement axes are shown in the figure below. Figure 7.2. DUT: Radio Board with the Wireless Starter Kit Mainboard (Illustration) Note: The radiated measurement results presented in this document were recorded in an unlicensed antenna chamber. Also the radiated power levels may change depending on the actual application (PCB size, used antenna, and so on). Therefore, the absolute levels and margins of the final application are recommended to be verified in a licensed EMC testhouse. 7.2.1 Radiated Measurements in the 2.4 GHz band For the transmitter antenna, the on-board printed Inverted-F antenna of the BRD4153A board was used (the C3 capacitor was mounted). During measurements, the board was attached to a Wireless Starter Kit Mainboard (BRD4001 (Rev. A02) ) which was supplied through USB. During measurements, the voltage supply for the board was 3.3 V provided by the mainboard. The supply for the RF section was 1.8 V provided by the on-chip DC-DC converter (for details, see the schematic of the BRD4153A). The transceiver was operated in continuous carrier transmission mode. The output power of the radio was set to 13 dBm based on the conducted measurement. The results are shown in the table below. Table 7.1. Maximums of the Measured Radiated Powers of BRD4153A 2.4 GHz EIRP [dBm] Orientation Margin [dB] Limit in EIRP [dBm] Fund 16.1 XZ/H 13.9 30 2nd -52.1 XZ/H 14.5 -37.6 3rd -57.3 XZ/H 20.3 -37.6 4th Noise* -/- >20 -30 5th Noise* -/- >10 -37.6 * Signal level is below the Spectrum Analyzer noise floor. As it can be observed, thanks to the high gain of the Inverted-F antenna, the level of the fundamental is higher than 13 dBm. The strongest harmonic is the double-frequency one and thanks to the additional suppression provided by the C3 capacitor its level is only around -50 dBm. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 10 BRD4153A Reference Manual EMC Compliance Recommendations 8. EMC Compliance Recommendations 8.1 Recommendations for 2.4 GHz ETSI EN 300-328 compliance As it was shown in the previous chapter, the radiated power of the fundamental of the BRD4153A EFR32 Mighty Gecko Radio Board complies with the 20 dBm limit of the ETSI EN 300-328 both in case of the conducted and the radiated measurements. The harmonic emissions are under the -30 dBm limit. Although the BRD4153A Radio Board has an option for mounting a shielding can, that is not required for the compliance. 8.2 Recommendations for 2.4 GHz FCC 15.247 compliance As it was shown in the previous chapter, the radiated power of the fundamental of the BRD4153A EFR32 Mighty Gecko Radio Board complies with the 30 dBm limit of the FCC 15.247. The harmonic emissions are under the -37.6 dBm applied limit both in case of the conducted and the radiated measurements. Although the BRD4153A Radio Board has an option for mounting a shielding can, that is not required for the compliance. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 11 BRD4153A Reference Manual Board Revisions 9. Board Revisions Table 9.1. BRD4153A Radio Board Revisions Radio Board Revision Description A01 Initial release A02 Temp. sensor enabled. A03 Updated EFR32 to revision C0. Note: The silkscreen marking on the board (e.g., PCBxxxx A00) denotes the revision of the PCB. The revision of the actual Radio Board can be read from the on-board EEPROM. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 12 BRD4153A Reference Manual Errata 10. Errata Table 10.1. BRD4153A Radio Board Errata Radio Board Revision Problem Description A01 Temp. sensor disabled. Temp. sensor enable resistor (R203) was mounted to the "disable" (R204) position. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 13 BRD4153A Reference Manual Document Revision History 11. Document Revision History Revision 1.6 2016-11-20 Minor editorial updates Revision 1.5 2016-10-31 Corrected error in radio board connector pinout diagram. Revision 1.4 2016-05-24 Updating Board Revisions content. Revision 1.3 2016-05-05 Adding Introduction chapter; moving SoC Description chapter (short ver.) to Block Description chapter. Minor improvements. Revision 1.2 2016-02-11 Adding RF Section Power Supply chapter. Minor improvements. Revision 1.1 2016-01-28 Fising image render problem. Revision 1.0 2015-11-16 Initial document version. silabs.com | Smart. Connected. Energy-friendly. Rev. 1.6 | 14 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2. Radio Board Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2.2 Radio Board Connector Pin Associations. . . . . . . . . . . . . . . . . . . . . 2 3. Radio Board Block Summary . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.2 Radio Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.3 Radio Board Block Description . 3.3.1 Wireless MCU . . . . . . 3.3.2 LF Crystal Oscillator (LFXO) . 3.3.3 HF Crystal Oscillator (HFXO) . 3.3.4 Matching Network for 2.4 GHz. 3.3.5 Inverted-F Antenna . . . . 3.3.6 UFL Connector . . . . . . 3.3.7 Radio Board Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 3 3 3 4 4 4 4. RF Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.2 Schematic of the RF Matching Network . . 4.2.1 Description of the 2.4 GHz RF Matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 . 5 4.3 RF Section Power Supply . . . . . . . . . . . . . . . . . . . 5 4.4 Bill of Materials for the 2.4 GHz Matching . . . . . . . . . . . . . . . . . . . . 5 4.5 Inverted-F Antenna . . . . . . . . . . . . . . . . . . . . . 6 . . . . . . . . . . . . . . . . . . 5. Mechanical Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6. EMC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 6.2 EMC Regulations for 2.4 GHz . . . . . . . . . . . . . 6.2.1 ETSI EN 300-328 Emission Limits for the 2400-2483.5 MHz Band 6.2.2 FCC15.247 Emission Limits for the 2400-2483.5 MHz Band. . . 6.2.3 Applied Emission Limits for the 2.4 GHz Band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8 8 8 7. RF Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.1 Conducted Power Measurements . . . . . . 7.1.1 Conducted Measurements in the 2.4 GHz band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 . 9 7.2 Radiated Power Measurements . . . . . . 7.2.1 Radiated Measurements in the 2.4 GHz band . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10 .10 . . 8. EMC Compliance Recommendations . . . . . . . . . . . . . . . . . . . . . .11 8.1 Recommendations for 2.4 GHz ETSI EN 300-328 compliance . . . . . . . . . . . . .11 8.2 Recommendations for 2.4 GHz FCC 15.247 compliance . . . . . . . . . . . . .11 9. Board Revisions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Table of Contents 15 . . 10. Errata. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 11. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . 14 Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Table of Contents 16 Simplicity Studio One-click access to MCU and wireless tools, documentation, software, source code libraries & more. Available for Windows, Mac and Linux! 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