PCA9554

PCA9554 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 compatible 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−compatible 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−high polarity inversion register. The PCA9554 features an active low interrupt output which indicates to the system master that an input state has changed. The device’s extended addressing capability allows up to 8 devices to share the same bus. Features 400 kHz I2C Bus Compatible (Note 1) 2.3 V to 5.5 V Operation Low Standby Current 5 V Tolerant I/Os 8 I/O Pins that Default to Inputs at Power−up High Drive Capability Individual I/O Configuration Polarity Inversion Register Active Low Interrupt Output Internal Power−on Reset No Glitch on Power−up Noise Filter on SDA/SCL Inputs Cascadable up to 8 Devices Industrial Temperature Range 16−lead TSSOP Package These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Applications White Goods (dishwashe...