3.6.1 Breakout Pads
Twenty breakout pads, which follow the EXP header pinout, are provided, and allow connection of peripherals or add-on boards. Ten of
the pads are located along the left side of the board and ten are located on the right side. The breakout pads expose I/O pins that can
be used with most of the EFR32MG24's features. Additionally, the VMCU (main power rail), 3V3 (LDO regulator output), and 5V power
rails are also exposed.
The breakout pads are pinned out similar to the EXP header found on other Silicon Labs Starter Kits, which ensures that commonly
used peripherals such as SPI, UART, and I
2
C buses are available on fixed locations. The rest of the pins are used for general purpose
IO. This allows the definition of EXP boards that can plug into a number of different Silicon Labs starter kits.
The pin-routing on EFR32 is very flexible, so most peripherals can be routed to any pin. However, pins may be shared between the
breakout pads and other functions on the xG24 Dev Kit. The table below includes an overview of the EXP header and functionality that
is shared with the kit.
Table 3.2. Expansion Header Pinout
Pin
Connection
EXP Header Function
Shared Feature
Right Side Breakout Pins
2
VMCU
EFR32MG24 voltage domain, included in AEM measurements.
4
PC03
SPI_COPI
IMU & Flash
6
PC02
SPI_CIPO
IMU & Flash
8
PC01
SPI_SCLK
IMU & Flash
10
PA07
SPI_CS
IMU_SPI_CS (when SENSOR_ENABLE = 1)
12
PA05
UART_TX
VCOM & Mini Simplicity
14
PA06
UART_RX
VCOM & Mini Simplicity
16
PC05
I2C_SDA
Qwiic I
2
C bus
18
5V
Board USB voltage
20
3V3
Board controller supply
Left Side Breakout Pins
1
GND
Ground
3
PB02
GPIO
BTN0
5
AIN3
ADC Negative Input
7
AIN2
ADC Positive Input
9
PB00
GPIO
LEDB
11
PB03
GPIO
BTN1
13
PD02
GPIO
LEDR
15
PC04
I2C_SCL
Qwiic I
2
C bus
17
BOARD_ID_SCL
Connected to Board Controller for identification of add-on boards.
19
BOARD_ID_SDA
Connected to Board Controller for identification of add-on boards.
UG524: xG24 Dev Kit User's Guide
Hardware
silabs.com
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