Expansion Connectors

The Odroid-c1 povides one 40-pin dual row expansion header “J2”. The location and pinout of these connectors is illustrated blew.
All signals on expansion headers are 3.3V except Analog input signal(1.8V).
Built-in pull-up/down resistor value is 60Kohm in the GPIOs.

GPIO wPi Name Alternative/
Driving Capability
Mode V PU/PD PIN PIN PU/PD V Mode Alternative/
Driving Capability
Name wPi GPIO
- - 3.3V - - - - 1 2 - - - - 5.0V - -
74 - I2CA_SDA - IN 1 - 3 4 - - - - 5.0V - -
75 - I2CA_SCL - IN 1 - 5 6 - - - - GND - -
83 7 GPIOY.3 -/2mA IN 0 P/U 7 8 P/U 1 ALT1 - GPIOX.16 - 113
- - GND - - - - 9 10 P/U 1 ALT1 - GPIOX.17 - 114
88 0 GPIOY.8 -/3mA IN 1 P/U 11 12 P/U 0 IN -/2mA GPIOY.7 1 87
116 2 GPIOX.19 -/2mA IN 1 P/U 13 14 - - - - GND - -
115 3 GPIOX.18 -/2mA IN 0 P/D 15 16 P/U 1 IN -/3mA GPIOX.7 4 104
- - 3.3V - - - - 17 18 P/U 1 IN -/3mA GPIOX.5 5 102
107 12 GPIOX.10 PWM1/2mA IN 1 P/U 19 20 - - - - GND - -
106 13 GPIOX.9 -/3mA IN 1 P/U 21 22 P/U 1 IN -/3mA GPIOX.6 6 103
105 14 GPIOX.8 -/4mA IN 1 P/U 23 24 P/D 0 IN -/2mA GPIOX.20 10 117
- - GND - - - - 25 26 P/U 1 IN - GPIOX.21 11 118
76 - I2CB_SDA - IN 1 - 27 28 - 1 IN - I2CB_SCL - 77
101 21 GPIOX.4 -/3mA IN 1 P/U 29 30 - - - - GND - -
100 22 GPIOX.3 -/3mA IN 1 P/U 31 32 P/U 1 IN -/3mA GPIOX.2 26 99
108 23 GPIOX.11 PWM0/3mA IN 0 P/D 33 34 - - - - GND - -
97 24 GPIOX.0 -/3mA IN 1 P/U 35 36 P/U 1 IN -/3mA GPIOX.1 27 98
- - ADC.AIN0 10bit ADC#1(0~1.8V) - - - 37 38 - - - Output! 1.8V REF - -
- - GND - - - - 39 40 - - - 10bit ADC#0 (0~1.8V) ADC.AIN1 - -

This I2S expansion connector exists only on the C1+

GPIO Name Alternative/
Driving Capability
Mode V PU/PD PIN
- GND - - - - 1
6 GPIOAO.6 I2S Data Input/2mA IN 0 - 2
- 5.0V - - - - 3
8 GPIOAO.8 I2S MCLK/2mA ALT2 0 P/U 4
10 GPIOAO.10 I2S LRCLK/2mA ALT2 0 P/U 5
9 GPIOAO.9 I2S SCLK/2mA ALT2 0 P/U 6
11 GPIOAO.11 I2S Data output/2mA ALT2 0 P/U 7