PCA9552D,112

Overview

The PCA9552D,112 is a 16-bit I2C-bus LED controller manufactured by NXP Semiconductors. It features 16 open-drain outputs with a maximum sink current of 25 mA per bit and 200 mA per package. The device operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz in Fast Mode. It includes an internal oscillator for programmable blink rates and duty cycles, allowing independent control of LED brightness without continuous bus communication. The component is housed in a TSSOP-24 package.

Feature Summary

• Integrates an internal oscillator to generate two user-programmable blink rates and duty cycles for each output channel.
• Provides independent PWM dimming control for 16 channels to support RGB color mixing and backlight applications.
• Utilizes open-drain outputs capable of directly driving LEDs with high sink current capacity.

Applications

• RGB color mixing systems requiring discrete brightness steps
• Display backlight control units
• General-purpose I/O expansion via unused bits

Procurement Notes

Verify the specific suffix '112' against the official datasheet to confirm tape-and-reel packaging specifications. Confirm that the D variant corresponds to the SOIC or TSSOP package type intended for your assembly process. Check for end-of-life status as distribution availability may be limited.

Selection Notes

Select this component when independent PWM dimming is required for multiple LEDs without burdening the microcontroller's timer resources. It is suitable for applications needing high sink current per channel and flexible address configuration on the I2C bus. Consider thermal dissipation limits if operating near maximum current ratings.

Part Context

This part belongs to the PCA95xx series of I2C-bus controllers designed for LED illumination. It complements other expanders like the PCA9551 by offering higher channel density and dedicated hardware blink functionality. The series addresses the need for efficient LED management in complex lighting architectures.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing I2C addressing schemes before considering alternative models from the same family.

FAQ

How does the PCA9552 handle LED blinking?

It uses an internal oscillator programmed with two distinct blink rates and duty cycles. Once configured, the device autonomously blinks LEDs without further commands from the bus master.

What is the maximum current capability?

Each output bit can sink up to 25 mA, with a total package limit of 200 mA (or 100 mA per octal group depending on thermal constraints).