PCA9534 8-bit I2C-bus And SMBus Low Power I/O Port With Interrupt

The PCA9534 is a 16-pin CMOS device that provide 8 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus SMBus applications and was 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/O expanders provide a simple solution when additional I/O is needed for ACPI Power Switches Sensors push buttons, LEDs fans, etc. The PCA9534 consists of an 8-bit Configuration Register (Input or Output selection); 8-bit Input Register 8-bit Output Register and an 8-bit Polarity Inversion Register (active HIGH or active LOW operation). The system master 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 or Output Register The polarity of the Input Port Register CAN be inverted with the Polarity Inversion Register All Registers CAN be read by the system master. Although pin-to-pin and I2C-bus address compatible with the PCF8574 series, software changes are required due to the enhancements and are discussed in Application Note AN469. The PCA9534 is identical to the PCA9554 except for the removal of the internal I/O pull-up resistor which greatly reduces power consumption when the I/Os are held LOW. The PCA9534 open-drain interrupt output is activated when any input state differs from its corresponding input port Register state and is used to indicate to the system master that an input state has changed. The power-on reset sets the Registers to their default values and initializes the device state machine. Three hardware pins (A0, A1, A2) vary the fixed I2C-bus address and allow up to eight devices to share the same I2C-bus SMBus
By NXP Semiconductors
PCA9534 's PackagesPCA9534 's pdf datasheet

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PCA9534 Pinout, Pinouts
PCA9534 pinout,Pin out
This is one package pinout of PCA9534,If you need more pinouts please download PCA9534's pdf datasheet.

PCA9534 Application circuits
PCA9534 circuits
This is one application circuit of PCA9534,If you need more circuits,please download PCA9534's pdf datasheet.

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