====== Expansion Connectors (Board Revision 0.1 : 2015/10/26) ======
The ODROID-C2 provides 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.

* signal not connnected.

----
**J2 - 2x20 pins**
^ Pin Number ^ Expansion Net Name ^ Description ^ Pin Number ^ Expansion Net Name ^ Description ^
|1|3.3V Power|  |2|5.0V Power| |
|3|I2CA_SDA| Export GPIO#205  |4|5.0V Power| | 
|5|I2CA_SCL| Export GPIO#206 |6|Ground| |
|7|GPIOY.BIT3| Export GPIO#214, Wiring Pi GPIO#7|*8|TXD1|Export GPIO#244|
|9|Ground| |*10|RXD1|Export GPIO#245|
|11|GPIOY.BIT8| Export GPIO#219, Wiring Pi GPIO#0|12|GPIOY.BIT7|Export GPIO#218, Wiring Pi GPIO#1|
|13|GPIOX.BIT19|Export GPIO#247, Wiring Pi GPIO#2|14|Ground| |
|*15|GPIOX.BIT18|Export GPIO#246, Wiring PI GPIO#3|16|GPIOX.BIT7|Export GPIO#235, Wiring Pi GPIO#4, PWM1 |
|17|3.3V Power| |18|GPIOX.BIT5|Export GPIO#233, Wiring Pi GPIO#5|
|19|GPIOX.BIT10|Export GPIO#238, Wiring Pi GPIO#12|20|Ground| |
|21|GPIOX.BIT9|Export GPIO#237, Wiring Pi GPIO#13|22|GPIOX.BIT6|Export GPIO#234, Wiring Pi GPIO#6, PWM0 |
|23|GPIOX.BIT8|Export GPIO#236, Wiring Pi GPIO#14|24|GPIOX.BIT20|Export GPIO#248, Wiring Pi GPIO#10|
|25|Ground| |26|GPIOX.BIT21|Export GPIO#249, Wiring Pi GPIO#11|
|27|I2CB_SDA| Export GPIO#207 |28|I2CB_SCL| Export GPIO#208 |
|29|GPIOX.BIT4|Export GPIO#232, Wiring Pi GPIO#21|30|Ground| |
|31|GPIOX.BIT3|Export GPIO#231, Wiring Pi GPIO#22|32|GPIOX.BIT2|Export GPIO#230, Wiring Pi#26|
|33|GPIOX.BIT11|Export GPIO#239, Wiring Pi GPIO#23|34|Ground| |
|35|GPIOX.BIT0|Export GPIO#228, Wiring Pi GPIO#24|36|GPIOX.BIT1|Export GPIO#229, Wiring Pi GPIO#27|
|37|ADC.AIN1|10bit ADC#1 (0~1.8Volt)|38|1.8V Power|For ADC reference voltage. Output!|
|39|Ground| |40|ADC.AIN0|10bit ADC#0 (0~1.8Volt)|

* Note: Pin# 8,10,15 are not connected to the 40pin header accidentally on the Engineering sample boards. \\
This issue is resolved in the production version.

**J7 - 1x7 pins**

**This I2S expansion connector exists only on the C2**
^ Pin Number ^ Expansion Net Name ^ Description ^
|1|Ground|  |
|2|GPIOAO.BIT6|I2S Data Input  |
|3|P5V0| 5.0V Power|
|4|GPIOAO.BIT8| I2S MCLK |
|5|GPIOAO.BIT10| I2S LRCLK |
|6|GPIOAO.BIT9| I2S SCLK |
|7|GPIOAO.BIT11| I2S Data Output |