NXP supports its GPIO Expanders with several demo board tools that can be used to develop software and evaluate performance of the devices. The I²C 2005-1 Evaluation Board is an I²C-based system that allows field application engineers, designers, and educators to use their Personal Computer to easily test, demonstrate, and experiment with I²C bus interface devices. The demonstration board is a valuable training tool that allows multiple operations to be performed in a setting similar to a real system environment. The board supports a maximum I²C bus speed of 400 kHz. The I²C bus FM-plus Development Kit and associated GPIO daughter cards provide a quick way to learn about the devices and the I²C bus protocol. The cards are modular, so they increase design flexibility while providing easy access to the expander’s I/O pins. The board supports a maximum I²C bus speed of 1 MHz.