IC MCP23008 I/O Port Expander 8-bit I2C
Product information:
Add 8 pins to your microcontroller with this MCP23008 port expander. The MCP23008 uses 2 I2C pins (which can be shared with other I2C devices) and in return you get 8 extra multifunctional pins. You can set each pin as an input, output, input with pull-up or open drain. You can even connect an interrupt signal so that your microcontroller gets a signal when one of the pins changes so that you don't have to poll the chip yourself every time.
The chip has an adjustable I2C address (using ADDR0-2 pins). Connect the pins to ground or power and you can set 8 different addresses.
Because the chip operates at 2.7V to 5.5V, you can use it with any setup (e.g. 3.3V or 5V).
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