PCA9533D/02,112

Overview

The PCA9533D/02,112 is a 4-bit I²C LED dimmer IC manufactured by NXP Semiconductors. It features four open-drain outputs capable of sinking up to 25 mA per bit and 100 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 Hz to 400 kHz. It includes an internal oscillator for programmable blink rates and duty cycles, enabling 256 brightness levels. The component is housed in an SOIC-8 package and functions as both an LED driver and general-purpose I/O expander.

Feature Summary

• Integrates fully programmable internal oscillators for two selectable blink rates with adjustable frequency and duty cycle
• Provides direct LED driving capability through open-drain outputs with edge rate control to minimize noise
• Supports simultaneous operation on the same I²C bus via fixed address differentiation between /01 and /02 variants

Applications

• RGB color tuning and backlight applications requiring multi-level brightness control
• General-purpose parallel input/output expansion for sensors, buttons, and alarm monitoring
• ACPI power switch management and fan control interfaces

Procurement Notes

Verify component authenticity through authorized distributors or official NXP channels due to end-of-life status. Confirm package integrity and pin alignment against datasheet specifications before integration. Ensure I²C bus addressing aligns with the specific /02 variant fixed address requirements to prevent communication conflicts.

Selection Notes

Select this component when a compact solution for low-channel LED dimming and GPIO expansion is required. The fixed I²C address simplifies system design by eliminating hardware address pins. Consider the thermal dissipation limits and output current constraints when designing for high-density LED arrays or multiple peripheral connections.

Part Context

This part belongs to the PCA9533 family of 4-bit I²C LED dimmers. It shares functional similarities with the PCA9532 but offers enhanced programmability through internal oscillators. The /02 suffix denotes a specific fixed I²C bus address distinct from the /01 variant, allowing mixed usage on a single bus line.

Replacement Considerations

PCA9533DP/02,118 (TSSOP-8 package variant)