MCP23017 I/O Expansion Breakout Board

The main features of the MCP23017 are:
• High-speed I2C data interface, operating at 100 kHz, 400 kHz or 1.7 MHz;
• I²C-Bus address settable in 8 combinations;
• interrupt pins configurable for level and logic function;
• configurable interrupt source;
• polarity inversion register for inputs;
• external reset input;
• standby current of 1 μA max;
• supply voltage from 1.8 V to 5.5 V.

Breakout boards are prototyping boards with the relevant component already soldered on, whose connections are brought out to easy-to-use pads with a standard pitch and termination; these connections are typically 2.54 mm pitch pads, like those of classic DIP ICs.
To help those who would like to use SMD components but lack the means or skill to solder them, a number of ICs have been selected (including sensors, switching power supplies, battery chargers, linear amplifiers, etc.) and mounted on ready-to-use boards.
These breakout boards are useful both for those who want the best of SMD electronics already available in a “traditional” format, and for those who -while able to work with SMD components- need to have such components available on prototyping boards to fit into existing circuits and run tests, or to build prototypes that integrate the functions of the relevant ICs before making the final PCB for a piece of equipment.