Instruction Manual
Table Of Contents
- Table of Contents
- 1. Introduction
- 2. Radio Board Connector
- 3. Radio Board Block Summary
- 4. RF Section
- 5. Mechanical Details
- 6. EMC Compliance
- 7. RF Performance
- 8. EMC Compliance Recommendations
- 9. Board Revision History
- 10. Errata
- 11. Document Revision History
3.3.4 Matching Network for 2.4 GHz
The BRD4186C Radio Board incorporates a 2.4 GHz matching network which connects the 2.4 GHz RF input/output of the
EFR32MG24 to the one on-board printed Inverted-F antenna. The component values were optimized for the 2.4 GHz band RF perform-
ance and current consumption with 10 dBm output power.
For a detailed description of the matching network, see section 4.2.1 2.4 GHz RF Matching Description.
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, the option to connect the output to the UFL connector is
available. If using this option, move the series 0 Ohm resistor to the antenna to the series resistor to the UFL connector (see section
4.2.1 2.4 GHz RF Matching Description 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 BRD4186C Radio Board interface to the Wireless Starter Kit Mainboard.
For more information on the pin mapping between the EFR32MG24B210F1536IM48 and the connectors, refer to section
2.2 Radio
Board Connector Pin Associations.
3.3.7 Inverted-F Antenna
The BRD4186C Radio Board includes a printed inverted-F antenna (IFA) tuned to have close to 50 Ohm impedance at the 2.4 GHz
band.
For a detailed description of the antenna, see section
4.4 Inverted-F Antenna.
3.3.8 Serial Flash
The BRD4186C Radio Board is equipped with an 8 Mbit Macronix MX25R SPI flash that is connected directly to the EFR32MG24 to
support over-the-air (OTA) updates. For additional information on the pin mapping, see the BRD4186C schematic.
3.3.9 Serial EEPROM
The BRD4186C Radio Board is equipped with a serial I
2
C EEPROM for board identification and to store additional board-related infor-
mation.
BRD4186C Reference Manual
Radio Board Block Summary
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