PCA9550DP,118

Overview

The PCA9550DP,118 is a 2-bit I²C bus LED driver manufactured by NXP Semiconductors. It features two open-drain outputs capable of sinking up to 25 mA per channel and 50 mA total per package. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies from 0 kHz to 400 kHz. It includes an internal oscillator for programmable blink rates, hardware reset functionality, and power-on reset. The component is housed in an 8-TSSOP surface-mount package.

Feature Summary

• Integrates an internal oscillator enabling programmable LED blinking without external components or continuous bus communication.
• Supports dual output states including steady on/off and two independently programmable blink rates with adjustable frequency and duty cycle.
• Provides hardware reset via low-active RESET pin and automatic initialization through power-on reset logic.

Applications

• LED lighting applications requiring reduced I²C bus traffic
• Systems needing independent LED status indication with programmable patterns
• Microcontroller-based designs where timer resources are limited

Procurement Notes

Verify component authenticity through authorized NXP distributors or certified partners. Confirm RoHS compliance status and REACH registration details prior to integration. Check current lifecycle status as the product may be subject to discontinuation notices. Ensure packaging specifications match assembly requirements for TSSOP-8 components.

Selection Notes

Select this component when designing systems requiring minimal I/O expansion for LED control with specific blinking patterns. Consider the 25 mA sink capability per output for direct LED driving. Evaluate the 2.3 V to 5.5 V operating range against system power rails. Assess thermal dissipation limits within the 8-TSSOP package for high-duty-cycle operations.

Part Context

This part belongs to the PCA9550 series of I²C bus LED drivers designed to offload timing tasks from microcontrollers. It differs from standard GPIO expanders by integrating dedicated blink rate registers and internal oscillators. The DP suffix indicates the TSSOP8 package variant, distinguishing it from SO8 or HVSON versions within the same functional family.

Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.