3.4 Expansion Header
On the right hand side of the Wireless STK Mainboard an angled 20-pin expansion header is provided to allow connection of peripher-
als or plugin boards. The connector contains a number of I/O pins that can be used with most of the EZR32 Happy Gecko's features.
Additionally, the VMCU, 3V3 and 5V power rails are also exported.
The connector follows a standard which ensures that commonly used peripherals such as an SPI, a UART and an I2C bus are available
on fixed locations in the connector. The rest of the pins are used for general purpose IO. This allows the definition of expansion boards
that can plug into a number of different Silicon Labs Starter Kits.
The figure below shows the pin assignment of the expansion header. Because of limitations in the number of available GPIO pins,
some of the expansion header pins are shared with kit features.
1
2
4
8
6
10
3
5
9
7
12
13
14
11
15
16
17
18
20
19
VMCU
SPI_MOSI / PE10
SPI_MISO / PE11
SPI_CLK / PE12
SPI_CS / PE13
UART_TX / PD4
UART_RX / PD5
I2C_SDA / PD6
5V
3V3
GND
PF2 / GPIO
PF4 / GPIO
PC9 / GPIO
PC10 / GPIO
PB11 / GPIO
NC
PD7 / I2C_SCL
Board ID SDA
Board ID SCL
Reserved (Board Identification)
EZR32 I/O Pin
Figure 3.3. Expansion Header
UG191: EZR32HG 434 MHz 10 dBm Wireless Starter Kit User's Guide
Connectors
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