PCA9552BS,118

Overview

The PCA9552BS,118 is a 16-bit I/O expander from NXP Semiconductors designed for I2C-bus and SMBus applications. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features open-drain outputs with a maximum sink current of 50 mA per bit and includes an interrupt output capability. Packaged in an HVQFN-24 format, it functions across an industrial temperature range of -40°C to +85°C, consuming 135 µA during operation.

Feature Summary

• Provides 16 general-purpose input/output expansion via standard I2C/SMBus interfaces
• Features open-drain outputs capable of driving loads directly without external pull-ups
• Includes interrupt output functionality to signal state changes to the host controller

Applications

• General purpose parallel input/output expansion in embedded systems
• ACPI power switch control and monitoring
• Sensor interface expansion
• Push-button and alarm monitoring integration

Procurement Notes

Verify the package type matches project requirements, as datasheets indicate both TSSOP24 and HVQFN24 variants exist within the PCA9552 family. Confirm the specific suffix corresponds to the desired physical footprint before ordering. Ensure compatibility with system voltage levels and bus speed requirements. Cross-reference the manufacturer part number with official NXP documentation to avoid confusion with similar LED driver models.

Selection Notes

Select this component when 16 digital I/O lines are required over an I2C bus. It is suitable for applications needing direct drive capabilities with moderate current requirements. Consider the interrupt feature if real-time status polling is inefficient. Verify that the operating voltage range aligns with the system's power rails and that the package size fits the PCB layout constraints.

Part Context

This device belongs to the PCA955x series of I/O expanders, which are widely used for adding parallel I/O ports to microcontrollers. It serves as a bridge between serial communication buses and parallel peripheral devices. The series is known for low power consumption and robust ESD protection, making it suitable for various industrial and consumer electronics applications requiring reliable data acquisition and control.

Replacement Considerations

The PCA9535BS,118 is a documented low-power variant within the same family offering similar functionality. Other compatible parts include the PCA9555BS,118 for standard performance or the PCAL9539APW,118 for agile I/O configurations. Always verify pinout compatibility and electrical specifications before substituting.