SLWRB4182A

EFR32MG22 2.4 GHz 6 dBm Radio Board BRD4182A Reference Manual The BRD4182A Wireless Gecko Radio Board enables developers to develop Bluetooth® Low Energy applications. The board contains a 2.4 GHz Wireless Gecko Wireless System-on-Chip and is optimized for operating at 6 dBm output power. Radiated and conducted testing is supported with the on-board printed antenna and UFL connector. The BRD4182A Wireless Gecko Radio Board plugs into the Wireless Starter Kit Mainboard, which is included with the Wireless Gecko Starter Kit and gives access to debug interface, Virtual COM port, packet trace, display, buttons, LEDs, and additional features from expansion boards. With the supporting Simplicity Studio suite of tools, developers can take advantage of graphical wireless application development and visual energy profiling and optimization. The board also serves as an RF reference design for applications targeting 2.4 GHz wireless operation with 6 dBm output power. This document contains a brief introduction and description of the BRD4182A Radio Board features, focusing on the RF sections and performance. silabs.com | Building a more connected world. RADIO BOARD FEATURES • Wireless SoC: EFR32MG22C224F512IM40 • CPU core: ARM® Cortex®-M33 • Flash memory: 512 kB • RAM: 32 kB • Operation frequency: 2.4 GHz • Transmit power: 6 dBm • Integrated PCB antenna, UFL connector (optional) • Crystals for LFXO and HFXO: 32.768 kHz and 38.4 MHz • 8 Mbit low-power serial flash for over-theair updates Rev. 1.00 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Radio Board Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Radio Board Connector Pin Associations . . . . . . . . . . . . . . . . . . . . . 5 3. Radio Board Block Summary . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.2 Radio Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 6 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 UFL Connector . . . . . 3.3.6 Radio Board Connectors . . 3.3.7 Inverted-F Antenna . . . . 3.3.8 Serial EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 6 6 6 7 7 7 7 4. RF Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . 8 4.2 Schematic of the RF Matching Network. . . 4.2.1 Description of the 2.4 GHz RF Matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 . 8 4.3 Bill of Materials for the 2.4 GHz Matching . . . . . . . . . . . . . . . . . . . . . 8 4.4 Inverted-F Antenna . . . . . . . . . . . . . . . . . . . . 9 5. Mechanical Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 . . . . . . . . . . . . . . . 6. EMC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 6.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 .11 .11 .11 7. RF Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 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 . . . . . . . 7.1 Conducted Power Measurements . . . . . . . . . . . 7.1.1 Conducted Power Measurements with Unmodulated Carrier . 7.1.2 Conducted Power Measurements with Modulated Carrier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 .12 .13 7.2 Radiated Power Measurements . . . . . . 7.2.1 Maximum Radiated Power Measurements . 7.2.2 Antenna Pattern Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 .14 .14 8. EMC Compliance Recommendations . . . . . . . . . . . . . . . . . . . . . 15 . . . . . . . . . . . . . . . 8.1 Recommendations for 2.4 GHz ETSI EN 300-328 Compliance . silabs.com | Building a more connected world. . . . . . . . . . . . . . . . .15 Rev. 1.00 | 2 8.2 Recommendations for 2.4 GHz FCC 15.247 Compliance . . .15 . . . . . . . . . . . . . . . . . . . . . . . . . . 16 10. Errata. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 11. Document Revision History 18 9. Board Revision History silabs.com | Building a more connected world. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rev. 1.00 | 3 BRD4182A Reference Manual Introduction 1. Introduction The EFR32™ Wireless Gecko Radio Boards provide a development platform (together with the Wireless Starter Kit Mainboard) for the Silicon Labs EFR32 Wireless Gecko Wireless System-on-Chips and serve as reference designs for the matching network of the RF interface. The BRD4182A Radio Board is designed to operate in the 2400-2483.5 MHz band with the RF matching network optimized for operating at 6 dBm output power. To develop and/or evaluate the EFR32 Wireless Gecko, the BRD4182A Radio Board can be connected to the Wireless Starter Kit Mainboard to get access to debug interface, Virtual COM port, packet trace, display, buttons, LEDs, and additional features from expansion boards, and also to evaluate the performance of the RF interface. silabs.com | Building a more connected world. Rev. 1.00 | 4 BRD4182A Reference Manual Radio Board Connector 2. Radio Board Connector 2.1 Introduction The board-to-board connector scheme allows access to all EFR32MG22 GPIO pins as well as the RESETn signal. For more information on the functions of the available pins, see the EFR32MG22 data sheet. 2.2 Radio Board Connector Pin Associations The figure below shows the mapping between the connector and the EFR32MG22 pins and their function on the Wireless Starter Kit Mainboard. P200 Upper Row 3v3 NC / P36 NC / P38 NC / P40 DBG_TDO_SWO / PA03 / P42 NC / P44 DBG_TMS_SWDIO / PA02 / F0 DBG_TDO_SWO / PA03 / F2 DBG_RESET / #RESET / F4 VCOM_TX / PA05 / F6 VCOM_CTS / PA08 / F8 UIF_LED0 / PD02 / F10 UIF_BUTTON0 / PB00 / F12 DISP_ENABLE / SENSOR_ENABLE / PC07 / F14 DISP_MOSI / PC00 / F16 DISP_EXTCOMIN / PA00 / F18 PTI_DATA / PC04 / F20 USB_VBUS 5V Board ID SCL GND P37 / PC07 / DISP_ENABLE / SENSOR_ENABLE P39 / NC P41 / PA04* / DBG_TDI* P43 / NC P45 / NC F1 / PA01 / DBG_TCK_SWCLK F3 / PA04* / DBG_TDI* F5 / PB04 / VCOM_ENABLE F7 / PA06 / VCOM_RX F9 / PA07 / VCOM_RTS F11 / PD03 / UIF_LED1 F13 / PB01 / UIF_BUTTON1 F15 / PC02 / DISP_SCLK F17 / PC06 / DISP_SCS F19 / PC05 / PTI_SYNC F21 / NC USB_VREG GND Board ID SDA P201 Lower Row GND PC01** / P0 PC03*** / P2 UIF_BUTTON0 / PB00 / P4 UIF_BUTTON1 / PB01 / P6 UIF_LED0 / PD02 / P8 UIF_LED1 / PD03 / P10 PB02 / P12 DISP_EXTCOMIN / PA00 / P14 DBG_TCK_SWCLK / PA01 / P16 DBG_TMS_SWDIO / PA02 / P18 DBG_TDO_SWO / PA03 / P20 DBG_TDI* / PA04 / P22 NC / P24 NC / P26 NC / P28 NC / P30 NC / P32 NC / P34 GND VMCU_IN P1 / PC00 / DISP_MOSI P3 / PC01** P5 / PC02 / DISP_SCLK P7 / PC03*** P9 / PA05 / VCOM_TX P11 / PA06 / VCOM_RX P13 / PB03 P15 / PB04 / VCOM_ENABLE P17 / NC P19 / PA07 / VCOM_RTS P21 / PA08 / VCOM_CTS P23 / NC P25 / PC04 / PTI_DATA P27 / PC05 / PTI_SYNC P29 / PC06 / DISP_SCS P31 / PC07 / DISP_ENABLE / SENSOR_ENABLE P33 / NC P35 / NC VRF_IN * Optional 0R resistor should be mounted to enable this connection. ** Mutually exclusive connections. Default: PC01 to P3. *** Mutually exclusive connections. Default: PC03 to P7. Figure 2.1. BRD4182A Radio Board Connector Pin Mapping silabs.com | Building a more connected world. Rev. 1.00 | 5 BRD4182A 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 BRD4182A Radio Board. 3.2 Radio Board Block Diagram The block diagram of the BRD4182A Radio Board is shown in the figure below. I2C UFL Connector 2.4 GHz RF GPIO UART Debug EFR32 EFR32 Wireless SoC Packet Trace 24AA024 Serial EEPROM 2.4 GHz RF SPI SPI I2C Radio Board Connectors 2.4 GHz RF AEM 8k 8 Mbit MX25R Serial Flash .4M 38 .76 32 LF Crystal Matching Network & Output Selection HF Crystal Inverted-F PCB Antenna Figure 3.1. BRD4182A Block Diagram 3.3 Radio Board Block Description 3.3.1 Wireless MCU The BRD4182A Wireless Gecko Radio Board incorporates an EFR32MG22C224F512IM40 Wireless System-on-Chip featuring 32-bit Cortex®-M33 core, 512 kB of flash memory, 32 kB of RAM and a 2.4 GHz band transceiver with output power up to 6 dBm. For additional information on the EFR32MG22C224F512IM40, refer to the EFR32MG22 Data Sheet. 3.3.2 LF Crystal Oscillator (LFXO) The BRD4182A Radio Board has a 32.768 kHz crystal mounted. For details regarding the crystal configuration, refer to application note AN0016.2: Oscillator Design Considerations. 3.3.3 HF Crystal Oscillator (HFXO) The BRD4182A Radio Board has a 38.4 MHz crystal mounted. For details regarding the crystal configuration, refer to application note AN0016.2: Oscillator Design Considerations. 3.3.4 Matching Network for 2.4 GHz The BRD4182A Radio Board incorporates a 2.4 GHz matching network which connects the 2.4 GHz RF input/output of the EFR32MG22 to the one on-board printed Inverted-F antenna. The component values were optimized for the 2.4 GHz band RF performance and current consumption with 6 dBm output power. silabs.com | Building a more connected world. Rev. 1.00 | 6 BRD4182A Reference Manual Radio Board Block Summary For detailed description of the matching network, see section 4.2.1 Description of the 2.4 GHz RF Matching. 3.3.5 UFL Connector To be able to perform conducted measurements, Silicon Labs added a 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 0 Ohm resistor. To support conducted measurements, or the connection of an external antenna, there is option to connect the output to the UFL connector. For this, the series 0 Ohm resistor to the antenna should be moved to the position of the series resistor to the UFL connector (see section 4.2.1 Description of the 2.4 GHz RF Matching for further details). On the layout, the footprints of these two resistors have overlapping pads to prevent simultaneous connection of the antenna and the UFL connector. 3.3.6 Radio Board Connectors Two dual-row, 0.05” pitch polarized connectors make up the BRD4182A Radio Board interface to the Wireless Starter Kit Mainboard. For more information on the pin mapping between the EFR32MG22C224F512IM40 and the Radio Board Connector, refer to section 2.2 Radio Board Connector Pin Associations. 3.3.7 Inverted-F Antenna The BRD4182A 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 section 4.4 Inverted-F Antenna. 3.3.8 Serial EEPROM The BRD4182A Radio Board is equipped with a serial I2C EEPROM for board identification and to store additional board related information. silabs.com | Building a more connected world. Rev. 1.00 | 7 BRD4182A Reference Manual RF Section 4. RF Section 4.1 Introduction This section gives a short introduction to the RF section of the BRD4182A Radio Board. 4.2 Schematic of the RF Matching Network The schematic of the RF section of the BRD4182A Radio Board is shown in the following figure. High Frequency Crystal U1B EFR32MG22 3 9 2 4 L102 1 C102 C101 TBD NM 100N 120P PAVDD 1 GND 15 2 C107 C106 C105 TBD NM 100N 120P CC1 50R_R1 18P C3 R1 50R_Lant2 L3 RF Analog Power RFVDD Inverted-F Antenna AT1 50R_IFA 0R 0R INVERTED_F HFXTAL_O L103 BLM18AG102SN1 C2 Antenna Tuning Component Path Selection 50R_CC1 14 P2 GND 12 C103 RF2G4_IO C1 10 2 BLM18AG102SN1 L1 RF I/O X1 38.4 MHz 1 Supply Filtering VDCDC RF Crystal HFXTAL_I 2.4 GHz Matching Network GND Ground RFVSS GND GND 13 R2 50R_P2 0R NM PA Power 3 1 GND 2 U.FL GND UFL Connector PAVDD GND GND Figure 4.1. Schematic of the RF Section of the BRD4182A 4.2.1 Description of the 2.4 GHz RF Matching The 2.4 GHz RF matching connects the RF2G4_IO pin to the on-board printed Inverted-F Antenna. The component values were optimized for the 2.4 GHz band RF performance and current consumption with the targeted 6 dBm output power. The matching network consists of a three-element impedance matching and harmonic filter circuitry and a DC blocking capacitor. For conducted measurements the output of the matching network can also be connected to the UFL connector by removing the series R1 resistor 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 Bill of Materials for the 2.4 GHz Matching The Bill of Materials of the 2.4 GHz matching network of the BRD4182A Radio Board is shown in the following table. Table 4.1. Bill of Materials for the BRD4182A 2.4GHz RF Matching Network Component Name Value Manufacturer Part Number L1 2.6 nH Murata LQP03HQ2N6B02 C1 1.2 pF Murata GRM0335C1H1R2WA01D C2 1.3 pF Murata GRM0335C1H1R3BA01D CC1 18 pF Murata GJM0335C1E180GB01D C3 Not Mounted - - silabs.com | Building a more connected world. Rev. 1.00 | 8 BRD4182A Reference Manual RF Section 4.4 Inverted-F Antenna The BRD4182A 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. The resulting impedance, that is presented to the output of the matching network, is shown in the following figure. During the measurement, the BRD4182A Radio Board was attached to a Wireless Starter Kit Mainboard. As it can be observed, the antenna impedace (blue curve) is close to 50 Ohm in the entire 2.4 GHz band, the reflection (red curve) is under -10 dB. Figure 4.2. Impedance and Reflection of the Inverted-F Antenna of the BRD4182A Board Measured from the Matching Output silabs.com | Building a more connected world. Rev. 1.00 | 9 BRD4182A Reference Manual Mechanical Details 5. Mechanical Details The BRD4182A Radio Board is illustrated in the figures below. DCDC Inductor PAVDD 2.4 GHz EFR32xG22 Supply Matching RF Output Filtering Network Selection DCDC & Supply Filter Caps. 30 mm LFXTAL Antenna Tuning Component Frame of the HFXTAL Optional RFVDD Printed Shielding UFL OTA Supply Inverted-F Can Connector Flash Filtering Antenna 45 mm Figure 5.1. BRD4182A Top View 5 mm 24 mm PA04 to DBG_TDI Selection Board Display Identification Enable Selection WSTK Sensor Enable Selection 27.3 mm PC03 to Exp Header Selection 28.6 mm PC01 to Exp Header Selection 15 mm Interface Connector PAVDD Supply Selection Interface Connector Figure 5.2. BRD4182A Bottom View silabs.com | Building a more connected world. Rev. 1.00 | 10 BRD4182A Reference Manual EMC Compliance 6. EMC Compliance 6.1 Introduction Compliance of the fundamental and harmonic levels of the BRD4182A Radio Board is tested against the following standards: • 2.4 GHz: • ETSI EN 300-328 • FCC 15.247 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 specific 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 emissions 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 which equals to -41.2 dBm in EIRP. 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 harmonics the -41.2 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. In addition, Silicon Labs applies the same restrictions to the conducted spectrum. By doing so, compliance with the radiated limits can be estimated based on the conducted measurement, by assuming the use of an antenna with 0 dB gain at the fundamental and the harmonic frequencies. The overall applied limits are shown in the table below. For the harmonics, that fall into the FCC restricted bands, the FCC 15.209 limit is applied, the ETSI EN 300-328 limit is applied for the rest. Table 6.1. Applied Limits for Spurious Emissions for the 2.4 GHz Band Harmonic Frequency Limit 2nd 4800~4967 MHz -41.2 dBm 3rd 7200~7450.5 MHz -41.2 dBm 4th 9600~9934 MHz -30.0 dBm 5th 12000~12417.5 MHz -41.2 dBm silabs.com | Building a more connected world. Rev. 1.00 | 11 BRD4182A Reference Manual RF Performance 7. RF Performance 7.1 Conducted Power Measurements During measurements, the BRD4182A 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 Power Measurements with Unmodulated Carrier The transceiver was operated in unmodulated carrier transmission mode. The output power of the radio was set to 6 dBm. The typical output spectrums are shown in the following figures. Figure 7.1. Typical Output Spectrum of the BRD4182A; PAVDD = 3.3 V As shown in the figure, the fundamental is close to 6 dBm and all of the unwanted emissions are under the -41.2 dBm 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 | Building a more connected world. Rev. 1.00 | 12 BRD4182A Reference Manual RF Performance 7.1.2 Conducted Power Measurements with Modulated Carrier Depending on the applied modulation scheme, and the Spectrum Analyzer settings specified by the relevant EMC regulations, the measured power levels are usually lower compared to the results with unmodulated carrier. These differences will be measured and used as relaxation factors on the results of the radiated measurement performed with unmodulated carrier. This way, the radiated compliance with modulated transmission can be evaluated. In this case, both the ETSI EN 300-328 and the FCC 15.247 regulations define the following Spectrum Analyzer settings for measuring the unwanted emissions above 1 GHz: • Detector: Average • RBW: 1 MHz The table below shows the measured differences in case of the supported modulation schemes. Table 7.1. Measured Relaxation Factors for the Supported Modulation Schemes Applied Modulation (Packet Length: 255 bytes) BLE Coded PHY: 125 Kb/s (PRBS9) [dB] BLE Coded PHY: 500 Kb/s (PRBS9) [dB] BLE 1M PHY: 1 Mb/s (PRBS9) [dB] BLE 2M PHY: 2 Mb/s (PRBS9) [dB] 2nd harmonic -2.7 -3.1 -3.3 -9.1 3rd harmonic -4.8 -5.2 -5.2 -10.7 4th harmonic -5.5 -6.5 -6.7 -11.9 5th harmonic -6.3 -6.5 -6.7 -11.4 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 relaxarion factors for the radiated measurements. 7.2 Radiated Power Measurements During measurements, the BRD4182A 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 board 360 degrees with horizontal and vertical reference antenna polarizations in the XY, XZ, and YZ cuts. The measurement planes are illustrated in the figure below. X Z Y Figure 7.2. Illustration of Reference Planes with a Radio Board Plugged into the Wireless Starter Kit Mainboard 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. silabs.com | Building a more connected world. Rev. 1.00 | 13 BRD4182A Reference Manual RF Performance 7.2.1 Maximum Radiated Power Measurements For the transmitter antenna, the on-board printed inverted-F antenna of the BRD4182A Radio Board was used (the R1 resistor was mounted). The supply for the RF section (RFVDD) and the 2.4 GHz power amplifier (PAVDD) was 1.8 V provided by the on-chip DC-DC converter; for details, see the schematic of the BRD4182A. The transceiver was operated in unmodulated carrier transmission mode. The output power of the radio was set to 6 dBm based on the conducted measurement. The results are shown in the tables below. The correction factors are applied based on the BLE 125 Kb/s coded modulation, showed in section 7.1.2 Conducted Power Measurements with Modulated Carrier. For the rest of the supported modulation schemes the correction factors are larger, thus the related calculated margins would be higher compared to the ones shown in the table below. Thus the below margins can be considered as worst case margins. Table 7.2. Maximums of the Measured Radiated Powers in EIRP [dBm] and the Calculated Modulated Margins in [dB] with the Wireless Starter Kit Mainboard; PAVDD = 1.8 V BLE 125 Kb/s Coded Modulation Frequency (2450 MHz) Measured Unmodulated EIRP [dBm] Orientation Correction Factor [dB] Calculated Modulated EIRP [dBm] Modulated Margin [dB] Fund 9.2 YZ/V NA (0 is used) 9.2 20.8 30.0 2nd -43.0 XZ/V -2.7 -45.7 4.5 -41.2 3rd -40.3 YZ/H -4.8 -45.1 3.9 -41.2 4th -46.7 YZ/H -5.5 -52.2 11.0 -30.0 5th -40.2 XZ/H -6.3 -46.5 5.3 -41.2 Limit in EIRP [dBm] * Signal level is below the Spectrum Analyzer noise floor. As it it is shown in the table, with 6 dBm output power, the radiated power of the fundamental is higher than 6 dBm due to the high antenna gain. The 3rd and 5th harmonics are above the limit in with the Wireless Starter Kit Mainboard in case of the unmodulated carrier transmission. But with the relaxation of the supported modulation schemes, the margin is at least 3.9 dB and 5.3 dB, respectively. 7.2.2 Antenna Pattern Measurements The measured normalized antenna patterns are shown in the following figures. Normalized Radiation Pattern [dB], BRD4182A with WSTK, XY cut 0 Normalized Radiation Pattern [dB], BRD4182A with WSTK, XZ cut 0° 0 -5 315° 45° -10 0 315° 45° -10 315° -15 -20 -20 -25 -25 -30 90° 225° 270° 135° 180° -30 90° -35 225° Horizontal Vertical 270° 135° 180° 0°= Z axis 45° -10 -15 -20 -35 0° -5 -15 -30 0°= X axis 0° -5 -25 270° Normalized Radiation Pattern [dB], BRD4182A with WSTK, YZ cut 90° -35 225° Horizontal Vertical 135° 180° 0°= Z axis Horizontal Vertical Figure 7.3. Normalized Antenna Pattern of the BRD4182A with the Wireless Starter Kit Mainboard silabs.com | Building a more connected world. Rev. 1.00 | 14 BRD4182A Reference Manual EMC Compliance Recommendations 8. EMC Compliance Recommendations 8.1 Recommendations for 2.4 GHz ETSI EN 300-328 Compliance As shown in section 7.2.1 Maximum Radiated Power Measurements, the power of the fundamental of the BRD4182A Wireless Gecko Radio Board with 6 dBm output is compliant with the 20 dBm limit of the ETSI EN 300-328 regulation. With the supported modulation schemes, the harmonics are also compliant with the relevant limits. Although the BRD4182A Radio Board has an option for mounting a shielding can, it is not required for the compliance. 8.2 Recommendations for 2.4 GHz FCC 15.247 Compliance As shown in section 7.2.1 Maximum Radiated Power Measurements, the power of the fundamental of the BRD4182A Wireless Gecko Radio Board with 6 dBm output is compliant with the 30 dBm limit of the FCC 15.247 regulation. With the supported modulation schemes, the harmonics are also compliant with the relevant limits. Although the BRD4182A Radio Board has an option for mounting a shielding can, it is not required for the compliance. silabs.com | Building a more connected world. Rev. 1.00 | 15 BRD4182A Reference Manual Board Revision History 9. Board Revision History The board revision can be found laser engraved in the Board Info field on the bottom side of the PCB, as outlined in the figure below. The revision printed on the silkscreen marks the PCB revision. PCB Revision Board Revision PCB4182A Rev. B01 BRD4182A Rev. B05 123456789 Figure 9.1. Revision Info Table 9.1. BRD4182A Radio Board Revision History Board Revision Description B05 New P/N for X2. B04 Removed optional/not mounted components. Fixed L101 P/N. B03 Updated U1 P/N. Fixed X2 P/N. B02 Updated matching network. B01 Updated matching network. B00 X3-->X1. Updated U1, X1 P/N, matching and USART markings. PCB sikscreen fix. A02 Matching layout improvement at C1 GND pad. A01 Mounted U1. Updated C1, C2 P/N. A00 Initial production release. silabs.com | Building a more connected world. Rev. 1.00 | 16 BRD4182A Reference Manual Errata 10. Errata There are no known errata at present. silabs.com | Building a more connected world. Rev. 1.00 | 17 BRD4182A Reference Manual Document Revision History 11. Document Revision History Revision 1.0 March, 2020 • Initial document revision. silabs.com | Building a more connected world. Rev. 1.00 | 18 Simplicity Studio One-click access to MCU and wireless tools, documentation, software, source code libraries & more. Available for Windows, Mac and Linux! IoT Portfolio www.silabs.com/IoT SW/HW www.silabs.com/simplicity Quality www.silabs.com/quality Support and Community community.silabs.com Disclaimer Silicon Labs intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Labs products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Labs reserves the right to make changes without further notice to the product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. Without prior notification, Silicon Labs may update product firmware during the manufacturing process for security or reliability reasons. Such changes will not alter the specifications or the performance of the product. Silicon Labs shall have no liability for the consequences of use of the information supplied in this document. This document does not imply or expressly grant any license to design or fabricate any integrated circuits. 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