PCA9555DWR

I/o Expanders Overview

The PCA9555DWR is a remote 16-bit I/O expander manufactured by Texas Instruments, designed for I2C and SMBus interfaces. It provides eight quasi-bidirectional outputs and eight inputs, accessible via two 8-bit registers (Input and Output) and an Output Port Configuration register. The device operates with a supply voltage range of 1.65 V to 5.5 V and supports multiple package options including SOIC-24 and TSSOP-24. It features configurable interrupt outputs and high-current drive capabilities, making it suitable for systems requiring expanded I/O functionality over serial communication buses.

I/o Expanders Feature Summary

• Provides 16 bits of general-purpose remote I/O expansion through I2C and SMBus interfaces
• Supports configurable interrupt output signaling for efficient event monitoring
• Enables flexible input/output direction configuration via internal control registers

I/o Expanders Applications

• Portable devices requiring extended I/O capabilities within limited pin counts
• Industrial control systems utilizing I2C/SMBus communication protocols
• Consumer electronics needing additional relay or LED driving capacity

I/o Expanders Procurement Notes

Verify the specific suffix 'DWR' corresponds to the desired tape-and-reel packaging format and temperature grade. Confirm that the I2C address pins are configured correctly for your system topology to avoid bus conflicts. Ensure voltage levels on the I/O ports match the connected load requirements, as they operate at the VCC level.

I/o Expanders Selection Notes

Select this component when a 16-bit I/O expansion solution is required with low power consumption and standard I2C compatibility. Consider the operating voltage range and package size constraints relative to the PCB layout. Evaluate if the interrupt functionality meets the system's real-time response needs compared to polling methods.

I/o Expanders Part Context

This part belongs to the PCA9555 family of I/O expanders, which are widely used in embedded systems for adding digital inputs and outputs. The 'DWR' suffix typically denotes a specific reel quantity and package type (SOIC-24) offered by Texas Instruments for surface-mount assembly processes.

I/o Expanders Replacement Considerations

Check for direct pin-compatible alternatives such as the PCA9555DR or PCA9555PW depending on package preference. Verify electrical specifications like current drive and voltage ranges against any substitute parts to ensure functional equivalence in the existing circuit design.