PCA8574; PCA8574A Remote 8-bit I/O expander for I2C-bus with interrupt Rev.
3 — 3 June 2013 Product data sheet 1.
General description The PCA8574/74A provides general-purpose remote I/O expansion via the two-wire bidirectional I2C-bus (serial clock (SCL), serial data (SDA)).
The devices consist of eight quasi-bidirectional ports, 400 kHz I2C-bus interface, three hardware address inputs and interrupt output operating between 2.
3 V and 5.
5 V.
The quasi-bidirectional port can be independently assigned as an input to monitor interrupt status or keypads, or as an output to activate indicator devices such as LEDs.
The system master can read from the input port or write to the output port throu...

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