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Product InformationAccessory Type: 16 Digital IO Expansion ModuleFor Use With: Arduino BoardProduct Range: -Product OverviewDFR0626 is a Gravity: MCP23017 I2C 16 digital IO expansion module. This Gravity:MCP23017 I2C IO 16 digital IO expansion module has 2 groups of IO pins, GPIOAand GPIOB. Each group has 8 independent IO interfaces, and each IO interface canbe set to input, output, pull-up input (connect to 100KR pull-up resistor),interrupt and so on.Supporting to expand 128 IOs at mostMultiple IO modeChangeable I2C address by dial switchMultiple VCC and GND pins leadedCompatible with both 3.3V and 5VOperating voltage range from 3.3V to 5.5VDimension is 44x32mm / 1.73x1.26inch