PCA9956BTWY

Overview

The PCA9956BTWY is a 24-channel constant-current LED driver IC manufactured by NXP USA Inc. It operates on an I²C bus interface with support for Fm+ speeds. The device provides linear PWM dimming with 12-bit resolution per channel, enabling high-precision color mixing and brightness control. Each output channel delivers up to 65mA of current, with a maximum supply voltage rating of 5.5V and individual channel voltage tolerance up to 20V. The component is housed in a 38-HTSSOP package with exposed pad and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates 24 independent constant-current channels for precise multi-color LED control
• Supports 12-bit linear PWM dimming for smooth gradient transitions and accurate grayscale rendering
• Includes built-in diagnostic capabilities for detecting open and short circuit conditions on LED outputs

Applications

• Backlighting systems for displays and monitors
• RGB LED arrays for decorative lighting and smart illumination
• Status indicator arrays in industrial equipment

Procurement Notes

Verify the specific suffix 'Y' against the manufacturer's official datasheet to confirm tape-and-reel packaging orientation and pin-out compatibility. Ensure the design supports the required I²C bus speed and that the PCB layout accommodates the thermal requirements of the 38-HTSSOP package with exposed pad for adequate heat dissipation during operation.

Selection Notes

Select this component when a high channel count is required for complex RGB matrices or large-scale backlighting applications. It is suitable for designs needing independent current control per channel without external transistors. Consider the 65mA output capability and 20V voltage tolerance to ensure compatibility with the target LED forward voltage and current specifications.

Part Context

This part belongs to the PCA9956B family of LED drivers from NXP Semiconductors. It is designed as a solution for applications requiring multiple individually controllable LED channels via a standard two-wire serial interface. The device simplifies system architecture by integrating current regulation and PWM generation directly into the IC.

Replacement Considerations

The PCA9956A is a related variant within the same product family. Verify pin compatibility and functional equivalence before substitution. Other NXP models such as the PCA9958 offer similar channel counts but utilize SPI interfaces instead of I²C.