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PCA9554 - 8-bit I2C and SMBus I/O Port

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.

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 Inversi.

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Datasheet preview – PCA9554

Datasheet Details

Part number PCA9554
Manufacturer onsemi
File Size 160.07 KB
Description 8-bit I2C and SMBus I/O Port
Datasheet download datasheet PCA9554 Datasheet
Additional preview pages of the PCA9554 datasheet.

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Full PDF Text Transcription

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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.
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