New Original IC PCA9554D,118

The PCA9554 and PCA9554A are 16-pin CMOS devices that provide 8 bits of GeneralPurpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications andwere developed to enhance the NXP Semiconductors family of I2C-bus I/O expanders.The improvements include higher drive capability, 5 V I/O tolerance, lower supply current,individual I/O configuration, 400 kHz clock frequency, and smaller packaging. I/Oexpanders provide a simple solution when additional I/O is needed for ACPI powerswitches, sensors, push buttons, LEDs, fans, and so on.The PCA9554/PCA9554A consist of an 8-bit Configuration register (Input or Outputselection); 8-bit Input Port register, 8-bit Output Port register and an 8-bit PolarityInversion register (active HIGH or active LOW operation). The system master can enablethe I/Os as either inputs or outputs by writing to the I/O configuration bits. The data foreach input or output is kept in the corresponding Input Port or Output Port register. Thepolarity of the read register can be inverted with the Polarity Inversion register. Allregisters can be read by the system master. Although pin-to-pin and I2C-bus addresscompatible with the PCF8574 series, software changes are required due to theenhancements and are discussed in Application Note AN469.

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