Intel Galileo Data sheet

Arduino Shield Supported Features

Galileo is compatible with Arduino Uno shields and is designed to support 3.3V or 5V shields, following the Arduino Uno Revision 3, including:

 

14 digital input/output pins, of which 6 can be used as Pulse Width Modulation (PWM) outputs;

• Each of the 14 digital pins on Galileo can be used as an input or output, using pinMode(),      digitalWrite(), and digitalRead() functions. 
• The pins operate at 3.3 volts or 5 volts. Each pin can source a max of 10mA or sink a maximum of 25    mA and has an internal pull-up resistor (disconnected by default) of 5.6k to 10 kOhms. 

A0 – A5 -  

• 6 analog inputs, via an AD7298 analog-to-digital (A/D) converter (datasheet) o Each of the 6 analog inputs, labeled A0 through A5, provides 12 bits of resolution (i.e., 4096 different values). By default they measure from ground to 5 volts. 

I 2C* bus, TWI, with SDA and SCL pins that are near to the AREF pin. 

•  TWI: A4 or SDA pin and A5 or SCL pin. Support TWI communication using the Wire library. 

 SPI 

•  Defaults to 4MHz to support Arduino Uno shields. Programmable up to 25MHz.

UART 

• (serial port) Programmable speed UART port (Pins 0 (RX) and 1 (TX)) 

ICSP (SPI) - 

• a 6 pin in-circuit serial programming (ICSP) header, located appropriately to plug into existing shields. These pins support SPI communication using the SPI library. 

 VIN. 

• The input voltage to the Galileo board when it's using an external power source (as opposed to 5 volts from the regulated power supply connected at the power jack). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin. 
•        Warning: The voltage applied to this pin must be a regulated 5V supply otherwise it could damage the Galileo board or cause incorrect operation. 

 5V output pin. 

• This pin outputs 5V from the external source or the USB connector. Maximum current draw to the shield is 800 mA 

 3.3V output pin.

•  A 3.3 volt supply generated by the on-board regulator. Maximum current draw to the shield is 800 mA 

 GND. 

•  Ground pins. 

IOREF. 

• The IOREF pin on Galileo allows an attached shield with the proper configuration to adapt to the voltage provided by the board. The IOREF pin voltage is controlled by a jumper on the board, i.e., a selection jumper on the board is used to select between 3.3V and 5V shield operation. 

 RESET button/pin 

•  Bring this line LOW to reset the sketch. Typically used to add a reset button to shields that block the one on the board. 

 AREF is unused on Galileo. Providing an external reference voltage for the analog inputs is not supported. 

• For Galileo it is not possible to change the upper end of the analog input range using the AREF pin and the analogReference() function.

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