Introduction

This is the documentation for Adafruit's xCA9554 driver for the Arduino platform. It is designed specifically to work with Adafruit dev and breakout boards that use TCA9554 or PCA9554

This library allows you to communicate with the TCA/PCA9554 I/O expander chip using I2C. The chip extends the number of I/O pins available for use in your projects. It is capable of interfacing with both 3.3V and 5V logic levels.

Dependencies

This library depends on the Adafruit BusIO library for low-level communication, and the standard Wire library for I2C communication.

Author

Written by Limor Fried/Ladyada for Adafruit Industries.

License

BSD license, all text here must be included in any redistribution.