The PCA9554 and PCA9554A are 16-pin CMOS devices that
provide 8 bits of General Purpose parallel Input/Output (GPIO)
2
expansion for I C/SMBus applications and were developed to
enhance the Philips family of I C I/O expanders. The improvements
include higher drive capability, 5V I/O tolerance, lower supply
current, individual I/O configuration, 400 kHz clock frequency, and
smaller packaging. I/O expanders provide a simple solution when
additional I/O is needed for ACPI power switches, sensors,
pushbuttons, LEDs, fans, etc..
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