Silicon Laboratories Thunderboard EFM32GG12, User Manual

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3.8.1 Breakout Pads
The board provides access to a total of 34 breakout pads of which 28 map to I/O pins of EFM32GG12. 17 of these are located along
the left side of the board while the remaining 17 are located on the right side of the board. The breakout pads allow access to VMCU
(EFM32GG12 power rail), 3.3V (debug LDO regulator), and 5V power rails.
The upper 20 of the breakout pads are pinned out similar to the EXP header found on 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 expansion boards that can be used in conjunction with a number of different Silicon
Labs starter kits.
The pin-routing on the EFM32GG12 is very flexible, so most peripherals can be routed to any pin. However, some pins are shared
between the breakout pads and other functions on the Thunderboard EFM32GG12. The table below shows an overview of the breakout
pads and functionality that is shared with the kit.
Table 3.1. Expansion Header Pinout
Pin Connection EXP Header Function Shared Feature Peripheral Mapping
Right Side Breakout Pins
2 VMCU EFM32GG12 voltage domain, included in AEM measurements.
4 PA0 SPI_MOSI US3_TX #0
6 PA1 SPI_MISO US3_RX #0
8 PA2 SPI_SCLK US3_CLK #0
10 PA3 SPI_CS US3_CS #0
12 PC4 UART_TX U0_TX #4
14 PC5 UART_RX U0_RX #4
16 PE4 I2C_SDA I2C0_SDA #7
18 5V Board USB voltage
20 3V3 Board controller supply
Left Side Breakout Pins
1 GND Ground
3 PD0 CAN_RX CAN0_RX #2
5 PD1 CAN_TX CAN0_TX #2
7 PA4 GPIO
9 PA5 GPIO
11 PA6 GPIO
13 PE15 GPIO
15 PE5 I2C_SCL I2C0_SCL #7
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.
Table 3.2. Remaining GPIO breakout pads
Pin EFM32G
G12 I/O
pin Kit peripheral/feature connection Pin EFM32G
G12 I/O
pin Kit peripheral/feature connection
21 PB12 MIC_CLK (PDM_CLK #3) 22 PE8 GPIO
UG371: Thunderboard EFM32GG12 User's Guide
Hardware
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