PCA9554 Datasheet | onsemi

8-bit I2C and SMBus I/O Port with Interrupt Description The PCA9554 is a CMOS device that provides 8- bit parallel input/output port expansion for I2C and SMBus patible applications. This I/O expander provides a simple solution in applications where additional I/Os are needed: sensors, power switches, LEDs, pushbuttons, and fans. The PCA9554 consist of an input port register, an output port register, a configuration register, a polarity inversion register and an I2C/SMBus- patible serial interface. Any of the eight I/Os can be configured as an input or output by writing to the configuration register. The system master can invert the PCA9554 input data by writing to the active-...