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PCF8574; PCF8574A Remote 8-bit I/O expander for I2C-bus ...
www.nxp.comRemote 8-bit I/O expander for I2C-bus with interrupt Table 5. PCF8574A address map 8. I/O programming 8.1 Quasi-bidirectional I/Os A quasi-bidirectional I/O is an input or output po rt without using a direction control register. Whenever the master reads the register, the value returned to master depends on the actual voltage or status of the pin.