Intel Galileo Board GALILEO1 Data Sheet
Product codes
GALILEO1
Order Number: 329681-003US
Galileo Jumper Configuration
There are three jumpers on Galileo that are used to vary the configuration of the board.
IOREF Jumper
To allow Galileo support both 3.3V and 5V shields, the external operating voltage is controlled via a jumper.
When the jumper is connected to 5V, Galileo is configured to be compatible with 5V shields and IOREF is set to
5V. When the jumper is connected 3.3V, Galileo is configured to be compatible with 3.3V shields and IOREF is
5V. When the jumper is connected 3.3V, Galileo is configured to be compatible with 3.3V shields and IOREF is
set to 3.3V.
The input range of the Analog pins is also controlled by the IOREF jumper and must not exceed the chosen
operating voltage. However, the resolution of AnalogRead() remains at 5 V/1024 units for the default 10-bit
operating voltage. However, the resolution of AnalogRead() remains at 5 V/1024 units for the default 10-bit
resolution or, 0.0049V (4.9mV) per unit regardless of IOREF jumper setting.
Warning: The IOREF jumper should be used to match the board and shield operating voltages. Incorrectly
setting the voltage could damage the board or the shield.
I
2
C* Address Jumper
To prevent a clash between the I
2
C* Slave address of the on board I/O expander and EEPROM with any external
I
2
C Slave devices, jumper J2 can be used to vary the I
2
C* address of the on-board devices.
With J2 connected to pin 1 (marked with white triangle), the 7-bit I/O Expander address is 0100001 and the 7-
bit EEPROM address is 1010001. Changing the jumper position changes the I/O Expander address to 0100000
and the EEPROM address to 1010000.
and the EEPROM address to 1010000.
VIN Jumper
On Galileo, the VIN pin can be used to supply 5V from the regulated power supply connected at the power jack
to attached shields or devices. If there is a need to supply more than 5V to a shield using VIN then the VIN
jumper should be removed from Galileo to break the connection between the on-board 5V supply and the VIN
connection on the board header.
connection on the board header.
Warning: If the VIN jumper is not removed and more than 5V is connected to VIN, it may damage the board or
lead to unreliable operation.