PCA9532PW,118

Overview

The PCA9532PW,118 is a 16-bit I²C-bus and SMBus LED dimmer optimized for RGB color mixing and backlight applications. It features an internal oscillator with two user-programmable blink rates and duty cycles coupled to the output PWM. The device provides open-drain outputs that directly drive LEDs with a maximum sink current of 25 mA per bit and 200 mA per package. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz in a TSSOP24 package.

Feature Summary

• Integrated internal oscillator enabling programmable blink rates and duty cycles for precise LED brightness control without external components
• Direct LED driving capability via open-drain outputs with specified sink current limits per channel and package
• Hardware reset functionality ensuring register initialization to default states upon power-up or active low signal

Applications

• Red/Green/Blue (RGB) color mixing systems
• Display backlight brightness adjustment
• General-purpose parallel input/output expansion for sensors and switches

Procurement Notes

Verify the complete part number including the suffix ,118 to ensure correct packaging configuration. Confirm compatibility with the target I²C bus voltage levels and check thermal dissipation requirements for the TSSOP24 package under full load conditions. Ensure the design accounts for the specific address pin configurations available on this variant.

Selection Notes

Select this component when 256 discrete dimming steps are required for RGB or backlight applications. It is suitable for designs needing integrated blinking functions to reduce microcontroller overhead. Consider the 25 mA per-bit sink limit and total package current constraints when determining the number of driven LEDs.

Part Context

This part belongs to the PCA9532 series of LED dimmers from NXP Semiconductors. It serves as a specialized I/O expander focused on lighting control rather than general-purpose digital expansion. The PW suffix indicates the TSSOP24 surface-mount package type used for compact circuit board implementations.

Replacement Considerations

PCA9533 offers similar dimming capabilities but with only 4 bits and different addressing constraints. For higher channel counts, PCA9535 provides 16-bit I/O expansion but lacks dedicated LED dimming hardware features.