PCA9550D,118

Overview

The PCA9550D,118 is a 2-bit I²C bus LED driver manufactured by NXP Semiconductors. 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 two open-drain outputs capable of sourcing 25 mA per channel with a total package limit of 50 mA. It utilizes an 8-TSSOP surface-mount package measuring 3.00 mm in width. The component includes an internal oscillator for programmable blink rates, hardware reset functionality, and power-on reset circuits.

Feature Summary

• Integrates an internal oscillator to enable programmable LED blinking without external components or continuous MCU intervention.
• Provides two open-drain outputs that can drive LEDs directly at 25 mA or function as general-purpose GPIO pins.
• Supports I²C bus and SMBus interfaces with noise filters on SCL/SDA inputs and low standby current consumption.

Applications

• LED indicator control in systems requiring reduced I²C bus communication traffic
• Timer release for microcontrollers in embedded applications
• General-purpose input/output expansion where limited pin counts are available

Procurement Notes

Verify the specific ordering code suffix to confirm the TSSOP-8 package variant. Confirm RoHS compliance status and REACH registration details prior to integration. Check manufacturer documentation for lead time updates as this part may be subject to lifecycle changes. Ensure ESD handling protocols are followed during assembly due to sensitive CMOS inputs.

Selection Notes

Select this component when only two independent output channels are required for LED driving or GPIO expansion. It is suitable for designs needing programmable hardware blinking to offload processing tasks from the main controller. Consider alternative models if more than two channels or higher current capabilities per package are necessary.

Part Context

This device belongs to the PCA9550 series of LED controllers designed for I²C bus applications. It distinguishes itself from standard I/O expanders by providing dedicated hardware blink rate programming. The series aims to minimize bus load by allowing the master device to set parameters once and let the IC handle repetitive toggling autonomously.

Replacement Considerations

Public confirmed substitute part numbers: None identified in provided documentation.