PCA9557 8-bit I²C-bus And SMBus I/O Port With Reset

The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus and I2C-bus applications. The PCA9557 consists of an 8-bit input port Register 8-bit output port Register and an I2C-bus SMBus Interface It has low current consumption and a high-impedance open-drain output pin, IO0. The system master CAN enable the PCA9557 's I/O as either input or output by writing to the configuration Register The system master CAN also invert the PCA9557 inputs by writing to the active HIGH polarity inversion Register Finally, the system master CAN reset the PCA9557 in the event of a time-out by asserting a LOW in the reset input. The power-on reset puts the Registers in their default state and initializes the I2C-bus SMBus state machine. The RESET pin causes the same reset/initialization to occur without de-powering the part.
By NXP Semiconductors
PCA9557 's PackagesPCA9557 's pdf datasheet

PCA9557 Pinout, Pinouts
PCA9557 pinout,Pin out
This is one package pinout of PCA9557,If you need more pinouts please download PCA9557's pdf datasheet.

PCA9557 Application circuits
PCA9557 circuits
This is one application circuit of PCA9557,If you need more circuits,please download PCA9557's pdf datasheet.

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