CAT9534WI-GT2

Overview

The CAT9534WI-GT2 is an 8-bit I/O expander designed for I2C and SMBus interfaces. It provides general-purpose digital input and output functionality with configurable configuration registers. The device features an interrupt output pin to signal data changes or events to the host processor. It operates within a supply voltage range of 1.65 V to 5.5 V, supporting low-power applications. The component is available in a TSSOP-16 package and supports standard and fast-mode I2C communication protocols up to 400 kHz.

Feature Summary

• Configurable I/O ports allow individual pins to be set as inputs or outputs via internal configuration registers.
• Interrupt output mechanism signals specific port changes or events to the system controller without continuous polling.
• Supports multiple I2C slave addresses to enable multiple devices on the same bus line.

Applications

• Portable consumer electronics requiring additional GPIO lines
• Industrial control systems utilizing I2C/SMBus networks
• Embedded systems needing remote I/O expansion

Procurement Notes

Verify the exact ordering suffix and package variant against the manufacturer's current datasheet before procurement. Confirm that the supplier provides original documentation matching the part number. Check for any recent product change notifications regarding packaging or testing procedures. Ensure compatibility with your system's I2C voltage levels and address configuration requirements.

Selection Notes

Select this component when an 8-bit I/O expansion solution is required for I2C-based architectures. Consider the operating voltage range and package availability relative to your PCB design constraints. Evaluate the interrupt functionality needs against simpler expanders without interrupt outputs. Compare power consumption specifications if battery-operated applications are involved.

Part Context

This part belongs to the CAT9534 family of I/O expanders from onsemi. It serves as a bridge between microcontrollers and peripheral devices, extending the limited I/O capabilities of the main processor. The WI-GT2 designation indicates the specific package type and tape-and-reel packaging format used for automated assembly processes.

Replacement Considerations

The PCA9534 from NXP Semiconductors is a functionally similar 8-bit I/O expander with interrupt support. Verify pinout compatibility and register mapping differences before substitution. Other alternatives may include parts from Texas Instruments or Analog Devices offering comparable I2C interface specifications.