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Updated MCP23008 MCP23017 (markdown)

andrethomas 2018-08-12 19:15:12 +02:00
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MCP23008-MCP23017.md

@ -8,6 +8,8 @@ Generally available breakout boards for the MCP23017 look similar to this:
![https://github.com/andrethomas/images/raw/master/mcp230xx/mcp23017_breakout.jpg](https://github.com/andrethomas/images/raw/master/mcp230xx/mcp23017_breakout.jpg) ![https://github.com/andrethomas/images/raw/master/mcp230xx/mcp23017_breakout.jpg](https://github.com/andrethomas/images/raw/master/mcp230xx/mcp23017_breakout.jpg)
The MCP23008 has 8 IO pins which the MCP230xx driver uses as D0 - D7. The MCP23017 has 16 IO pins which the MCP230xx driver uses as D0 - D15. This is visualised in the circuit diagram below but it's important to note that the MCP23017 actually differentiates between PORTA (being A0 to A7) and PORTB (being B0 to B7) - The MCP230xx driver combines the two ports in sequence to translate to pins represented as D0 through D15 for the MCP23017.
The chip, can however, be wired up quite easily especially if you can source the DIP version of the chip. Here's a basic outline of what a typical circuit would require to be functional: The chip, can however, be wired up quite easily especially if you can source the DIP version of the chip. Here's a basic outline of what a typical circuit would require to be functional:
![Manual Wiring for MCP23008 / MCP23017](https://github.com/andrethomas/images/blob/master/mcp230xx/mcp230xx_manual_wiring_v2.png) ![Manual Wiring for MCP23008 / MCP23017](https://github.com/andrethomas/images/blob/master/mcp230xx/mcp230xx_manual_wiring_v2.png)