Silicon Labs BRD4305A : BGM13S32 Module Radio Board Reference Manual

Silicon Labs BRD4305A : BGM13S32 Module Radio Board Reference Manual

BGM13S32 Module Radio Board BRD4305A Reference Manual

The BRD4305A Blue Gecko Radio Board contains a Blue Gecko BGM13S32 module which integrates Silicon Labs' EFR32BG13 Blue Gecko SoC into a small form factor System-in-Package (SiP) module. The fully certified module contains all components (a high-performance transceiver, an energy efficient 32-bit MCU, HF crystal, RF passives, and antenna) required for a system-level implementation of Bluetooth ® Low Energy and proprietary wireless networks operating in the 2.4 GHz band with 18 dBm output power.

The BRD4305A Blue Gecko Radio Board plugs into the Wireless Starter Kit Mainboard, which is included with the Blue Gecko Starter Kit and gives access to display, buttons, and additional features from expansion boards. With the supporting Simplicity Studio suite of tools, developers can take advantage of graphical wireless application develop ment, BGScript for Python-like scripting, and visual energy profiling and optimization.

This document contains a brief introduction and description of the BRD4305A Radio Board features, focusing on the RF performance.

RADIO BOARD FEATURES

• Wireless Module: BGM13S32F512GA • CPU core: ARM Cortex ® -M4 with FPU • Flash memory: 512 kB • RAM: 64 kB • Operation frequency: 2.4 GHz • Transmit power: 18 dBm • Integrated chip antenna, RF matching network, HF crystal, and decoupling • Option for UFL connector • Crystal for LFXO: 32.768 kHz • 8 Mbit low-power serial flash for over-the air updates

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Table of Contents

1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. Radio Board Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Radio Board Connector Pin Associations. . . . . . . . . . . . . . . . . . . . . 4

3. Radio Board Block Summary . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.2 Radio Board Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.3 Radio Board Block Description . . . . . . . . . . . . . . . . . . . . . . . . 5 3.3.1 Wireless SiP . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.3.2 LF Crystal Oscillator (LFXO) . . . . . . . . . . . . . . . . . . . . . . . 5 3.3.3 UFL Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3.3.4 Radio Board Connectors . . . . . . . . . . . . . . . . . . . . . . . . 6 3.3.5 Serial Flash . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.3.6 Serial EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4. Mechanical Details . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5. EMC Compliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.2 EMC Regulations for 2.4 GHz . . . . . . . . . . . . . . . . . . . . . . . . 8 5.2.1 ETSI EN 300-328 Emission Limits for the 2400-2483.5 MHz Band . . . . . . . . . . 8 5.2.2 FCC15.247 Emission Limits for the 2400-2483.5 MHz Band . . . . . . . . . . . . 8 5.2.3 Applied Emission Limits for the 2.4 GHz Band . . . . . . . . . . . . . . . . . 8

6. RF Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

6.1 Conducted Power Measurements . . . . . . . . . . . . . . . . . . . . . . . 9 6.1.1 Conducted Measurements in the 2.4 GHz Band . . . . . . . . . . . . . . . . 9

6.2 Radiated Power Measurements . . . . . . . . . . . . . . . . . . . . . . . .10

6.2.1 Radiated Measurements in the 2.4 GHz Band . . . . . . . . . . . . . . . . .10

7. EMC Compliance Recommendations . . . . . . . . . . . . . . . . . . . . . .11

7.1 Recommendations for 2.4 GHz ETSI EN 300-328 Compliance . . . . . . . . . . . . .11

7.2 Recommendations for 2.4 GHz FCC 15.247 Compliance . . . . . . . . . . . . . . .11

8. Board Revision History . . . . . . . . . . . . . . . . . . . . . . . . . .

9. Errata . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . .

12

13

14

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BRD4305A Reference Manual Introduction

1. Introduction

The BRD4305A Radio Boards provide a development platform (together with the Wireless Starter Kit Mainboard) for the Silicon Labs Blue Gecko BGM13S32 modules.

By carrying the BGM13S32 module, the BRD4305A Radio Board is designed to operate in the 2400-2483.5 MHz with the maximum of 18 dBm output power.

To develop and/or evaluate the BGM13S32 module, the BRD4305A Radio Board can be connected to the Wireless Starter Kit Main board to get access to display, buttons, and additional features from expansion boards (EXP boards).

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BRD4305A Reference Manual Radio Board Connector

2. Radio Board Connector 2.1 Introduction

The board-to-board connector scheme allows access to all BGM13S32 GPIO pins as well as the RESETn signal. For more information on the functions of the available pins, see the BGM13S32 data sheet.

2.2 Radio Board Connector Pin Associations

The figure below shows the mapping between the connector and the BGM13S32 pins and their function on the Wireless Starter Kit Mainboard.

P201 Lower Row P200 Upper Row

GND VCOM.#CTS_SCLK / PA2 / P0 VCOM.#RTS_#CS / PA3 / P2 PD10 / P4 PD11 / P6 PD12 / P8 DEBUG.TDI / PF3 / P10 PC10 / P12 PA4 / P14 VCOM_ENABLE / PA5 / P16 PTI.CLK / PB11 / P18 PTI.DATA / PB12 / P20 PTI.SYNC / PB13 / P22 DEBUG.TCK_SWCLK / PF0 / P24 DEBUG.TMS_SWDIO / PF1 / P26 DEBUG.TDO_SWO / PF2 / P28 UIF_LED0 / PF4 / P30 UIF_LED1 / PF5 / P32 UIF_BUTTON0 / PF6 / P34 GND 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 3v3 UIF_BUTTON1 / PF7 / P36 NC / P38 NC / P40 NC / P42 NC / P44 DEBUG.TMS_SWDIO / PF1 / F0 DEBUG.TDO_SWO / PF2 / F2 DEBUG.RESET / RADIO_#RESET / F4 P17 / NC P19 / NC VCOM.TX_MOSI / PA0 / F6 VCOM.#CTS_SCLK / PA2 / F8 P21 / NC P23 / NC P25 / NC P27 / 1V8* P29 / NC P31 / PD13 / DISP_EXTCOMIN P33 / PD14 / DISP_SCS P35 / PD15 / DISP_ENABLE VRF_IN UIF_LED0 / PF4 / 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 GND P37 / PD9 / SENSOR_ENABLE P39 / NC P41 / NC P43 / NC P45 / NC F1 / PF0 / DEBUG.TCK_SWCLK

F3 / PF3 / DEBUG.TDI

F5 / PA5 / VCOM_ENABLE F7 / PA1 / VCOM.RX_MISO

F9 / PA3 / VCOM.#RTS_#CS F11 / PF5 / UIF_LED1 F13 / PF7 / UIF_BUTTON1 F15 / PC8 / DISP_SCLK F17 / PD14 / DISP_SCS F19 / PB13 / PTI.SYNC

F21 / PB11 / PTI.CLK

USB_VREG GND Board ID SDA

* Connection is available by mounting the corresponding 0 Ohm resistor.

(See the schematic of the Radio Board for details.)

Figure 2.1. BRD4305A Radio Board Connector Pin Mapping silabs.com

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BRD4305A 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 BRD4305A Radio Board.

3.2 Radio Board Block Diagram

The block diagram of the BRD4305A Radio Board is shown in the figure below.

I2C

Radio Board Connectors

GPIO UART Debug AEM Packet Trace SPI EFR32

SiP Module

RF In/Out Chip Antenna

2.4 GHz RF 2.4 GHz RF UFL Connector Path Selection 24AA0024 Serial EEPROM 8 Mbit MX25R Serial Flash 32.768k

LF Crystal

Figure 3.1. BRD4305A Block Diagram 3.3 Radio Board Block Description 3.3.1 Wireless SiP

The BRD4305A Blue Gecko Radio Board incorporates an BGM13S32F512GA Blue Gecko BGM13S32 module featuring 32-bit Cor tex ® -M4 with FPU core, 512 kB of flash memory, 64 kB of RAM and a 2.4 GHz band transceiver with output power up to 18 dBm. For additional information on the BGM13S32F512GA, refer to the BGM13S data sheet.

3.3.2 LF Crystal Oscillator (LFXO)

The BRD4305A Radio Board has a 32.768 kHz crystal mounted. For details regarding the crystal configuration, refer to Application Note "AN0016.1: Oscillator Design Considerations".

3.3.3 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 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 measure ments through the UFL connector, the series component to the antenna should be removed and the 0 Ohm resistor should be mounted (see section for further details).

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BRD4305A Reference Manual Radio Board Block Summary

3.3.4 Radio Board Connectors

Two dual-row, 0.05” pitch polarized connectors make up the BRD4305A Radio Board interface to the Wireless Starter Kit Mainboard.

For more information on the pin mapping between the BGM13S32F512GA and the Radio Board Connector, refer to section

2.2 Radio Board Connector Pin Associations .

3.3.5 Serial Flash

The BRD4305A Radio Board is equipped with an 8 Mbit Macronix MX25R SPI flash that is connected directly to the BGM13S32 to support over-the-air (OTA) updates. For additional information on the pin mapping see the BRD4305A schematic.

3.3.6 Serial EEPROM

The BRD4305A Radio Board is equipped with a serial I 2 C EEPROM for board identification and to store additional board related infor mation.

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BRD4305A Reference Manual Mechanical Details

4. Mechanical Details

The BRD4305A Radio Board is illustrated in the figures below.

40 mm LF XTAL UFL Connector RF Output Selection xGM13S OTA Flash 20 mm 33 mm 37.5 mm

Figure 4.1. BRD4305A Top View

Board Identification 27.3 mm 28.6 mm 20 mm 5 mm Interface Connector Interface Connector 24 mm

Figure 4.2. BRD4305A Bottom View silabs.com

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BRD4305A Reference Manual EMC Compliance

5. EMC Compliance 5.1 Introduction

Compliance of the fundamental and harmonic levels of the BRD4305A Radio Board is tested against the following standards: • 2.4 GHz: • ETSI EN 300-328 • FCC 15.247

5.2 EMC Regulations for 2.4 GHz 5.2.1 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 unwan ted emissions in the 1 GHz to 12.75 GHz domain, the specific limit is -30 dBm EIRP.

5.2.2 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 speci fied 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.

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 harmon ics the -37.6 dBm limit should be applied. For the 4th harmonic the -20 dBc limit should be applied.

5.2.3 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 spec trum. 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.

Table 5.1. Applied Limits for Spurious Emissions for the 2.4 GHz Band Harmonic

2nd 3rd 4th 5th

Frequency

4800~4967 MHz 7200~7450.5 MHz 9600~9934 MHz 12000~12417.5 MHz

Limit

-37.6 dBm -37.6 dBm -30 dBm -37.6 dBm

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BRD4305A Reference Manual RF Performance

6. RF Performance 6.1 Conducted Power Measurements

During measurements, the BRD4305A 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.

6.1.1 Conducted Measurements in the 2.4 GHz Band

The BRD4305A Radio Board was connected directly to a Spectrum Analyzer through its UFL connector (the was removed and a 0 Ohm resistor was soldered to the position). The supply for the module (VDD) was 3.3 V provided by the mainboard; for details, see the sche matic of the BRD4305A. The transceiver was operated in continuous carrier transmission mode. The output power of the radio was set to 18 dBm.

The typical output spectrum is shown in the following figure.

Figure 6.1. Typical Output Spectrum of the BRD4305A

As shown in the figure, the fundamental is slightly lower than 18 dBm and all of the unwanted emissions are under the -37.6 dBm ap plied 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.

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BRD4305A Reference Manual RF Performance

6.2 Radiated Power Measurements

During measurements, the BRD4305A 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 de grees with horizontal and vertical reference antenna polarizations in the XY, XZ, and YZ cuts. The measurement planes are illustrated in the figure below.

Figure 6.2. 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 radi ated 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.

6.2.1 Radiated Measurements in the 2.4 GHz Band

The supply for the module (VDD) was 3.3 V provided by the mainboard; for details, see the BRD4305A schematic. The transceiver was operated in continuous carrier transmission mode. The output power of the radio was set to 18 dBm based on the conducted measure ment.

The fundamental was set to the frequency where the maximum antenna gain was measured. The results are shown in the table below.

Note:

The frequency in which the antenna gain has its maximum value can vary between modules due to the technological spreading of the passive RF components and the antenna.

Table 6.1. Maximums of the Measured Radiated Powers in EIRP [dBm] Frequency

Fund (2460 MHz) 2nd 3rd

EIRP [dBm]

17.1

-41.6

<-50 * 4th 5th <-50 * <-50 * * Signal level is below the Spectrum Analyzer noise floor.

Orientation

XY/H YZ/V -/ -/ -/-

Margin [dB]

12.9

4 >10 >10 >10

Limit in EIRP [dBm]

30 -37.6

-37.6

-30 -37.6

As shown in the table, the level of the fundamental is around 17 dBm. The strongest harmonic is the double-frequency one and it is compliant with the -37.6 dBm applied limit with 4 dB margin.

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BRD4305A Reference Manual EMC Compliance Recommendations

7. EMC Compliance Recommendations 7.1 Recommendations for 2.4 GHz ETSI EN 300-328 Compliance

As shown in the previous section, the power of the fundamental frequency of the BRD4305A Blue Gecko Radio Board with 18 dBm output is compliant with the 20 dBm limit of the ETSI EN 300-328 regulation in both the conducted and radiated measurements. The harmonic emissions are under the -30 dBm limit with large margin.

7.2 Recommendations for 2.4 GHz FCC 15.247 Compliance

As shown in the previous section, the power of the fundamental frequency of the BRD4305A Blue Gecko Radio Board with 18 dBm output is compliant with the 30 dBm limit of the FCC 15.247 regulation. The harmonic emissions are under the -37.6 dBm applied limit.

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BRD4305A Reference Manual Board Revision History

8. Board Revision History Table 8.1. BRD4305A Radio Board Revisions Radio Board Revision

A02 A01 A00

Description

Updated module PCB footprint and antenna clearance dimensions.

Updated module revision and footprint. Pin 1V8 to WSTK pad conn. option.

Initial revision.

Note:

The silkscreen marking on the board (e.g. PCBxxxx A00) denotes the revision of the PCB. The revision of the actual Radio Board is laser printed in the "Board Info" field on the PCB. Also, it can be read from the on-board EEPROM.

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9. Errata

There are no known errata at present.

BRD4305A Reference Manual Errata

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10. Document Revision History Revision 1.00

July, 2018 • Initial document revision.

BRD4305A Reference Manual Document Revision History

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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 and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. Silicon Labs shall have no liability for the consequences of use of the information supplied herein. This document does not imply or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products are not designed or authorized to be used within any Life Support System without the specific written consent of Silicon Labs. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant personal injury or death. Silicon Labs products are not designed or authorized for military applications. Silicon Labs products shall under no circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons.

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Silicon Laboratories Inc.® , Silicon Laboratories®, Silicon Labs®, SiLabs® and the Silicon Labs logo®, Bluegiga®, Bluegiga Logo®, Clockbuilder®, CMEMS®, DSPLL®, EFM®, EFM32®, EFR, Ember®, Energy Micro, Energy Micro logo and combinations thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZRadio®, EZRadioPRO®, Gecko®, ISOmodem®, Micrium, Precision32®, ProSLIC®, Simplicity Studio®, SiPHY®, Telegesis, the Telegesis Logo®, USBXpress® Limited. All other products or brand names mentioned herein are trademarks of their respective holders. , Zentri , Z-Wave, and others are trademarks or registered trademarks of Silicon Labs. ARM, CORTEX, Cortex-M3 and THUMB are trademarks or registered trademarks of ARM Holdings. Keil is a registered trademark of ARM

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