9
ODROID-XU4 USER MANUAL
HDMI port
The XU4 model uses a standard Type-A HDMI connector.
Ethernet RJ-45 jack
The standard RJ45 Ethernet port for LAN connection supports
10/100/1000 Mbps speed. The green LED Flashes when there is 100
Mbps connectivity, and the yellow LED Flashes when there is 1000
Mbps connectivity.
General Purpose Input and Output (GPIO) ports
The 30-pin GPIO port can be used as GPIO/IRQ/SPI/ADC, and
the 12-pin GPIO port can be used as GPIO/I2S/I2C for electronics and
robotics. The GPIO pins on an ODROID-XU4 are a great way to inter-
face with physical devices like buttons and LEDs using a lightweight
Linux controller. If you’re a C/C++ or Python developer, there’s a use-
ful library called WiringPi that handles interfacing with the pins, which
is described in Chapter 4. Note that all of the GPIO ports are 1.8Volt,
and the ADC inputs are limited to 1.8Volt. If a sensor or peripheral
needs higher voltage, the GPIO ports may be level-shifted to 3.3V or
5V using the XU4 Level Shifter Shield.
Serial console port
Connecting to a PC gives access to the Linux console. You can
monitor the boot process, or to log in to the XU4 to perform root main-
tenance. Note that this serial UART uses a 1.8 volt interface, and it is
recommended to use the USB-UART module kit available from Hard-
kernel. A Molex 5268-04a (2.5mm pitch) is mounted on the PCB, and
its mate is Molex 50-37-5043 Wire-to-Board Crimp Housing.
RTC (Real Time Clock) backup battery connector
If you want to add a RTC functions for logging or keeping time
when offline, just connect a Lithium coin backup battery (CR2032 or
equivalent). All of the RTC circuits are included on the ODROID-XU4
by default. It connects with a Molex 53398-0271 1.25mm pitch Head-
er, Surface Mount, Vertical type (Mate with Molex 51021-0200).
Gigabit Ethernet
The Realtek RTL8211F is a highly intergrated 10/100/1000M
Ethernet transceiver that complies with 10Base-T, 100Base-TX, and
1000Base-T IEEE 802.3 standards.
USB MTT hub controller
The Genesys GL3521 is a 2-port, low-power, and configurable
USB 3.0 SuperSpeed hub controller.
Chapter 1
