Pin #
Signal name
1
NC
2
T1OUT
3
R1IN
4
NC
5
GND
6
NC
7
CTS
8
RTS
9
NC
UEXT
The UEXT connector is typically used to attach additional modules to the board. It nests three popular
interfaces – UART, I2C, and SPI. You can also find 3.3V power output and GND (respectively, pin #1 and
pin #2).
Pin #
Signal name
1
3.3V
2
GND
3
USART2_TX
4
USART2_RX
5
I2C1_SCL
6
I2C1_SDA
7
SPI3_MISO
8
SPI3_MOSI
9
SPI3_SCK
10
CS_UEXT
SD/MMC
Pin #
Signal name
1
MCIDAT2
2
CS_MMC
3
SPI3_MOSI
4
3.3V
5
SPI3_SCK
6
GND
7
SPI3_MISO
8
MCIDAT1
9
Not connected
10
Not connected
11
Not connected
12
Not connected
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