SparkFun Blocks for Intel® Edison - I2C Breakout Block
Contributors:
CaseyTheRobot
CaseyTheRobot 
Board Overview
I2C Block Functional Diagram TOP
I2C Port - Standard I2C port broken out. VOUT provides power based on Level Select position.
Level Select - Provides level selection between 3.3V and VSYS levels on VOUT. Default 3.3V
Expansion Header - The 70-pin Expansion header breaks out the functionality of the Intel Edison. This header also passes signals and power throughout the stack. These function much like an Arduino Shield.