NXP PCA9554CPWJ

PCA9554CPWJ is an 8bit I²C-bus and SMBus I/O port with interrupt CMOS device. It provides 8 bits of general purpose parallel input/output (GPIO) expansion for I²C-bus/SMBus applications and were 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, 400KHz clock frequency, and smaller packaging. I/O expanders provide a simple solution when additional I/O is needed for ACPI power switches, sensors, push buttons, LEDs, fans, and so on. It consist of an 8-bit configuration register (input or output selection); 8-bit input port register, 8-bit output port register and an 8-bit Polarity inversion register (active HIGH or active LOW operation). The system can enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or output is kept in the corresponding Input port or output port register.