ODROID-C2 Quadcore Development Board With Android 5.1 Lollipop Based

Processor

Amlogic S905 Quad Core Cortex™-A53 1.5GHz 64bit ARMv8 processor with Mali™ -450 GPU

RAM

Samsung K4B4G1646D : 2GByte DDR3 32bit RAM (512MByte x 4pcs)

eMMC module socket

8GB / 16GB / 32GB / 64GB MMC from Samsung
The eMMC storage access time is 2-3 times faster than the SD card. You can purchase 4 size options: 8GB, 16GB, 32GB and 64GB. Using an eMMC module will increase speed and responsiveness, similar to the way in which upgrading to a Solid State Drive (SSD) in a typical PC also improves performance over a mechanical hard drive (HDD).

Micro Secure Digital (MicroSD) Card slot

There are two different methods of storage for the operating system. One is by using a MicroSD Card and another is using an eMMC module, which is normally used for external storage for smartphones and digital cameras. The ODROID-C2 can utilize the newer UHS-1 SD model, which is about 2 times faster than a normal class 10 card.

5V2A DC input

This is for 5V power input, with an inner diameter of 0.8mm, and an outer diameter of 2.5mm. The ODROID-C2 consumes less than 0.5A in most cases, but it can climb to 2A if many passive USB peripherals are attached directly to the main board.

USB host ports

There are four USB 2.0 host ports. You can plug a keyboard, mouse, WiFi adapter, storage or many other devices into these ports. You can also charge your smartphone with it! If you need more than 4 ports, you can use a powered external USB hub to reduce the power load on the main device.

HDMI port

Type-A standard HDMI connector.

Ethernet RJ-45 jack

The standard RJ45 Ethernet port for LAN connection supports 10/100/1000Mbps speed.

Status / Power LEDs

The ODROID-C2 has four indicator LEDs that provide visual feedback.

Infrared (IR) receiver

This is a remote control receiver module that can accept standard 37.9Khz carrier frequency based wireless data in NEC format.

Micro USB OTG port

You can use the standard micro-USB connector with Linux Gadget drivers on your host PC, which means that the resources in the ODROID-C2 can be shared with typical PCs. You can also add a micro-USB to HOST connector if you need an additional USB host port. 
You can also power the C2 via this port using stable 5V/2A USB charger. 

General Purpose Input and Output (GPIO) ports

These 40pin GPIO port can be used as GPIO/I2C/UART/ADC for electronics and robotics. 
The 40 GPIO pins on an ODROID-C2 are a great way to interface with physical devices like buttons and LEDs using a lightweight Linux controller. If you’re a C/C++ or Python developer, there’s a useful library called WiringPi that handles interfacing with the pins. We’ve already ported the WiringPi v2 library to ODROID-C2.
Please note that pins #37, #38 and #40 are not compatible with Raspberry Pi B+ 40pin header. Those pins are dedicated for Analog input function.
Also note that all the GPIO ports are 3.3Volt. But the ADC inputs are limited to 1.8Volt.

Serial console port

Connecting to a PC gives access to the Linux console. You can see the log of the boot, or to log in to the C2 to change the video or network settings. Note that this serial UART uses a 3.3 volt interface. We recommend the USB-UART module kit from Hardkernel.

Gigabit Ethernet PHY

Realtek RTL8211F is a highly integrated Ethernet transceiver that complies with 10Base-T, 100Base-TX, and 1000Base-T IEEE 802.3 standards.

USB MTT hub controller

GENESYS LOGIC GL852G is used to implement the 4-port Hub function which fully complies with Universal Serial Bus Specification Revision 2.0. 

USB VBUS controller

NCP380 Protection IC for USB power supply from OnSemi.

Power switch port

You can add a slide switch or rocker switch on this port if you want to implement a hardware on/off switch.
If this port is closed, the power is off.
If this port is opened, the power is on.

Power supply circuit

Discrete DC-DC converters and LDOs are used for CPU/DRAM/IO power supply.

Power protector IC

NCP372 Over-voltage, Over-current, Reverse-voltage protection IC from OnSemi.