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Block Diagram and Schematic

ODROID-C1 targets to be a cheap, small and flexible enough computer for daily life.
Built with ARM Cortex-A5 Quad-core CPU and Mali450MP2 GPU, and open source software, ODROID-C1 can serve as a platform to make lots of applications for different purposes.

Schematics and drawings are available here.
For the new C1+
For the original C1

C1+ has below improvements from the original C1

- Change the HDMI connector to Type-A from Type-D.
- Improved SD card compatibility
- CEC function regardless of the RTC backup battery installation
- Power path from USB OTG port as well as DC-Jack
- Expose I2S signals for external audio DAC





ProcessorAmlogic S805 : Quad Core Cortex™-A5 processor with Dual Core Mali-450 GPU
eMMC module socket8GB/64GB : Toshiba
eMMC 16GB/32GB : Sandisk iNAND Extreme
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 slotThere 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-C1 can utilize the newer UHS-1 SD model, which is about 2 times faster than a normal class 10 card.
Note that there are some cards which needs additional booting delay time around 30 seconds.
According to our test, most Sandisk Micro-SD cards don't cause the booting delay. We will make a compatibility list soon.
5V2A DC inputhis is for 5V power input, with an inner diameter of 0.8mm, and an outer diameter of 2.5mm. The ODROID-C1 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 portsThere 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.
Micro HDMI portTo minimize the size of the board, we used the Type-D micro-HDMI connector.
Ethernet RJ-45 jackThe standard RJ45 Ethernet port for LAN connection supports 10/100/1000Mbps speed.
Green LED Flashes when there is 100Mbps connectivity
Yellow(Orange) LED Flashes when there is 1000Mbps connectivity
Status / Power LEDsThe ODROID-C1 has four indicator LEDs that provide visual feedback.
Red LED : Power Hooked up to 5V power
Blue LED
Alive Solid light : u-boot is running
Flashing : Kernel is running (heart beat)
Infrared (IR) receiverThis 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-C1 can be shared with typical PCs.
You can also add a micro-USB to HOST connector if you need an additional USB host port.
Note that this port cannot be used for power input if you have the original C1. C1+ can accept the power input.
General Purpose Input and Output (GPIO) portsThese 40pin GPIO port can be used as GPIO/I2C/SPI/UART/ADC for electronics and robotics.
The 40 GPIO pins on an ODROID-C1 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-C1.
Note that all the GPIO ports are 3.3Volt. The ADC inputs are limited to 1.8Volt.
Serial console portConnecting to a PC gives access to the Linux console.
You can see the log of the boot, or to log in to the C1 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.
Molex 5268-04a(2.5mm pitch) is mounted on the PCB. Its mate is Molex 50-37-5043 Wire-to-Board Crimp Housing.
RTC (Real Time Clock) backup battery connectorIf 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-C1 by default.
Molex 53398-0271 1.25mm pitch Header, Surface Mount, Vertical type (Mate with Molex 51021-0200)
Gigabit Ethernet PHYRealtek RTL8211F is a highly integrated Ethernet transceiver that complies with 10Base-T, 100Base-TX, and 1000Base-T IEEE 802.3 standards.
USB MTT hub controllerGENESYS LOGIC GL852G is used to implement the 4-port Hub function which fully complies with Universal Serial Bus Specification Revision 2.0.
USB VBUS controllerNCP380 Protection IC for USB power supply from OnSemi.
Boot media selectorIf this port is opened, the first boot media is always eMMC.
If this port is closed, the first boot media is always SD-card.
Power switch portYou 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 circuitDiscrete DC-DC converters LDOs are used for CPU/DRAM/IO power supply.
Power protector ICNCP372 Over-voltage, Over-current, Reverse-voltage protection IC from OnSemi.

Due to the limited power output from a computer's USB port, we suggest only powering the ODROID-C1 with a good quality 5V/2A PSU

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.

J2 - 2×20 pins

Pin Number Expansion Net Name Description Driving Capability Pin Number Expansion Net Name Description Driving Capability
13.3V Power 25.0V Power
3I2CA_SDA Export GPIO#74 45.0V Power
5I2CA_SCL Export GPIO#75 6Ground
7GPIOY.BIT3 Export GPIO#83, Wiring Pi GPIO#7 2mA 8TXD1Export GPIO#113
9Ground 10RXD1Export GPIO#114
11GPIOY.BIT8 Export GPIO#88, Wiring Pi GPIO#0 3mA 12GPIOY.BIT7Export GPIO#87, Wiring Pi GPIO#1 2mA
13GPIOX.BIT19Export GPIO#116, Wiring Pi GPIO#2 2mA 14Ground
15GPIOX.BIT18Export GPIO#115, Wiring PI GPIO#3 2mA 16GPIOX.BIT7Export GPIO#104, Wiring Pi GPIO#4 3mA
173.3V Power 18GPIOX.BIT5Export GPIO#102, Wiring Pi GPIO#5 3mA
19GPIOX.BIT10(MOSI)Export GPIO#107, Wiring Pi GPIO#12, PWM1 2mA 20Ground
21GPIOX.BIT9(MISO)Export GPIO#106, Wiring Pi GPIO#13 3mA 22GPIOX.BIT6Export GPIO#103, Wiring Pi GPIO#6 3mA
23GPIOX.BIT8(SPI_SCLK)Export GPIO#105, Wiring Pi GPIO#14 4mA 24GPIOX.BIT20Export GPIO#117, Wiring Pi GPIO#10 2mA
25Ground 26GPIOX.BIT21Export GPIO#118, Wiring Pi GPIO#11 2mA
27I2CB_SDA Export GPIO#76 28I2CB_SCL Export GPIO#77
29GPIOX.BIT4Export GPIO#101, Wiring Pi GPIO#21 3mA 30Ground
31GPIOX.BIT3Export GPIO#100, Wiring Pi GPIO#22 3mA 32GPIOX.BIT2Export GPIO#99, Wiring Pi#26 3mA
33GPIOX.BIT11Export GPIO#108, Wiring Pi GPIO#23, PWM0 3mA 34Ground
35GPIOX.BIT0Export GPIO#97, Wiring Pi GPIO#24 3mA 36GPIOX.BIT1Export GPIO#98, Wiring Pi GPIO#27 3mA
37ADC.AIN110bit ADC#1 (0~1.8Volt) 381.8V PowerFor ADC reference voltage. Output!
39Ground 40ADC.AIN010bit ADC#0 (0~1.8Volt)

J7 - 1×7 pins

This I2S expansion connector exists only on the C1+

Pin Number Expansion Net Name Description Driving Capability
3P5V0 5.0V Power
7GPIOAO.BIT11 I2S Data Output 2mA

UART Console Connector

|Pin 4 - GND|
|Pin 3 - RXD|
|Pin 2 - TXD|
|Pin 1 - VCC|


Enable the OTG device function on ODROID-C1+

C1+ PCB Rev 0.4 2015/09/30 has a new jumper J8.

Remove the Jumper on J8 if you don't use the USB OTG port as a power input
It will reduce the power consumption and heat significantly.

Remove the J8 jumper to make a stable access to the device mode (Gadget driver or ADB/Fastboot interface).

If you remove the J8 Jumper, the power path from the micro-USB port is disabled.

If your C1+ PCB is previous version, you need to desolder the R94 as described in this link.


Caution : Over-Voltage Protection feature

1. The power source must be connected to the DC-Jack.
Micro-USB-OTG and other 5Volt rails have not the protection feature.

2. Micro-USB power path Jumper(J8) must be removed to enable the Over-Voltage Protection.

3. Maximum over-voltage must be lower than 16Volt.

Regulatory Compliance Documents

en/c1_hardware.txt · Last modified: 2017/07/04 11:02 by john1117
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