Expansion Connectors

The ODROID-C2 provides 40-pin dual row expansion header “J2” and 7-pin single row expansion header “J7”.
The location and pinout of these connectors are illustrated blow. (Board Revision 0.2 : 2016/02/26)
All signals on expansion headers are 3.3V except Analog input signal.
If you use the engineering sample, refer a pin map on this link. Expansion Connectors (Board Revision 0.1 : 2015/10/26)

ODROID-C2 doesn't support the HW SPI pin interface.

GPIO wPi Name Alternative Mode V PU/PD PIN PIN PU/PD V Mode Alternative Name wPi GPIO
- - 3.3V - - - - 1 2 - - - - 5.0V - -
205 - I2CA_SDA - IN 1 - 3 4 - - - - 5.0V - -
206 - I2CA_SCL - IN 1 - 5 6 - - - - GND - -
249 7 GPIOX.21 - IN 1 P/U 7 8 P/U 1 ALT2 /dev/ttyS1 TXD1 - 240
- - GND - - - - 9 10 P/U 1 ALT2 /dev/ttyS1 RXD1 - 241
247 0 GPIOX.19 - IN 1 P/U 11 12 P/D 0 IN - GPIOX.10 1 238
239 2 GPIOX.11 - IN 1 P/U 13 14 - - - - GND - -
237 3 GPIOX.9 - IN 1 P/U 15 16 P/U 1 IN - GPIOX.8 4 236
- - 3.3V - - - - 17 18 P/U 1 IN - GPIOX.5 5 233
235 12 GPIOX.7 PWM1 IN 1 P/U 19 20 - - - - GND - -
232 13 GPIOX.4 - IN 1 P/U 21 22 P/U 1 IN - GPIOX.3 6 231
230 14 GPIOX.2 - IN 1 P/U 23 24 P/U 1 IN - GPIOX.1 10 229
- - GND - - - - 25 26 P/D 0 IN - GPIOY.14 11 225
207 - I2CB_SDA - IN 1 - 27 28 - 1 IN - I2CB_SCL - 208
228 21 GPIOX.0 - IN 1 P/U 29 30 - - - - GND - -
219 22 GPIOY.8 - IN 1 P/U 31 32 P/U 1 IN - GPIOY.13 26 224
234 23 GPIOX.6 PWM0 IN 0 P/D 33 34 - - - - GND - -
214 24 GPIOY.3 - IN 1 P/U 35 36 P/U 1 IN - GPIOY.7 27 218
- - ADC.AIN1 10bit ADC (0~1.8V) - - - 37 38 - - - - 1.8V REF - -
- - GND - - - - 39 40 - - - 10bit ADC(00~1.8V) ADC.AIN0 - -

This I2S expansion connector exists only on the C2

GPIO Name Alternative Mode V PU/PD PIN
- GND - - - - 1
128 GPIOAO.6 SPDIF Output ALT4 0 P/U 2
- 5.0V - - - 3
130 GPIOAO.8 I2S MCLK ALT4 1 P/U 4
132 GPIOAO.10 I2S LRCLK ALT4 0 P/U 5
131 GPIOAO.9 I2S SCLK ALT4 1 P/U 6
133 GPIOAO.11 I2S Data Output ALT4 0 P/U 7

Square soldering pad is Pin #1 as below picture.