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Add MCP23008 i2c IO expander

KiCad Bot requested to merge github/fork/nivekg/MCP23008 into master

Created by: nivekg

Hey people,

Here's a symbol for the MCP23008 i2c IO expander. Since they come in three different packages, I made three symbols with the package name abbreviations added to the end of the symbol name. Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/MCP23008-MCP23S08-Data-Sheet-20001919F.pdf

The screenshot of the symbols are attached.

MCP23008_P: mcp23008_p

MCP23008_SO: mcp23008_so

MCP23008_SS: mcp23008_ss

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