User's Manual

18 Single Board Computer
2. GPIO header
This 40-pin GPIO (General-purpose Input/Output) header can be
designated (in software) as an input or output pin and is used for
a wide range of purposes. Of the 40 pins, 28 are GPIO pins (shared
with SPI/UART/I2C pins). Please refer to the tables below for the pin
denitions for Linux Yocto and Win 10 IoT Core.
Win 10 IoT core
Pin denition Pin# 40P GPIO Pin# Pin denition
3V 1 2
5V
I2C2_SDA 145 3 4
I2C2_SCL 144 5 6 GND
UART1_RTS# 155 7 8 151 UART1_TXD
GND 9 10 150 UART1_RXD
UART1_CTS# 154 11 12 121 GPIO4_IO25
JTAG_TMS 13 14 GND
JTAG_TRST 15 16 86 GPIO3_IO22
3V 17 18 87 GPIO3_IO23
ECSPI2_MOSI 139 19 20 GND
ECSPI2_MISO 140 21 22 JTAG_TCK
ECSPI2_SCLK 138 23 24 141 ECSPI2_SS0
GND 25 26 68 ECSPI2_SS1
I2C3_SDA 147 27 28 146 I2C3_SCL
JTAG_TDO 29 30 GND
GPIO3_IO24 88 31 32 131 PWM3
PWM4 130 33 34 GND
GPIO4_IO24 120 35 36 85 GPIO3_IO21
JTAG TDI 37 38 119 GPIO4_IO23
GND 39 40 122 GPIO4_IO26