PCA9555PWRE4

I/o Expanders Overview

The PCA9555PWRE4 is a remote 16-bit I2C and SMBus I/O expander manufactured by Texas Instruments. It provides general-purpose digital input and output expansion via a two-wire serial interface. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. It features an interrupt output pin for efficient event monitoring and configuration registers that allow individual pins to be set as inputs or outputs. The component is housed in a 24-TSSOP surface-mount package and is designed for operation across a temperature range of -40°C to +85°C.

I/o Expanders Feature Summary

• Provides 16-bit I/O expansion through standard I2C and SMBus interfaces
• Includes dedicated interrupt output pin for asynchronous status signaling
• Features configuration registers enabling flexible input/output pin assignment

I/o Expanders Applications

• Portable devices requiring extended GPIO capabilities
• Industrial control systems utilizing SMBus communication
• Consumer electronics with limited microcontroller pins

I/o Expanders Procurement Notes

Verify the presence of the 'E4' suffix, which indicates lead-free packaging compliance. Confirm the specific tape-and-reel quantity requirements against distributor specifications. Ensure the ordering part number matches the exact package variant needed for the PCB footprint. Cross-reference the manufacturer datasheet revision to confirm pinout consistency before finalizing procurement orders.

I/o Expanders Selection Notes

Select this component when a 16-bit expansion solution is required over the 8-bit PCA9554. The TSSOP-24 package offers a balance of pin count and board space efficiency compared to larger packages. Consider the 2.3 V minimum operating voltage if interfacing with low-voltage logic domains. Verify that the system bus speed does not exceed the 400 kHz maximum specification for reliable data transmission.

I/o Expanders Part Context

This part belongs to the PCA9555 series of remote I/O expanders from Texas Instruments. It serves as a legacy alternative to newer variants like the TCA9555, which may offer different voltage ranges or power characteristics. The E4 suffix specifically denotes environmental compliance regarding lead content in the manufacturing process.

I/o Expanders Replacement Considerations

• PCA9555PWR
• PCA9555PW

I/o Expanders FAQ

What is the function of the configuration registers?

The configuration registers allow each of the 16 I/O bits to be independently defined as either an input or an output, providing flexible system integration.

Does the PCA9555PWRE4 support SMBus protocols?

Yes, the device is compatible with both I2C and SMBus serial communication standards.

How is the interrupt signal generated?

The interrupt output pin activates when an input state changes or when a register value differs from its expected state, depending on the configuration settings.