PCA9634D,118

Overview

The PCA9634D,118 is an I²C-bus controlled 8-bit LED driver optimized for RGBA color mixing applications. It features eight outputs with individual 8-bit PWM controllers operating at 97 kHz and a group controller at 190 Hz. The device supports Fast-mode Plus (Fm+) interfaces up to 1 MHz. Supply voltage ranges from 2.3 V to 5.5 V, with outputs tolerant to 5.5 V. Sink current is 25 mA at 5 V, while source current reaches 10 mA in totem-pole mode. Operating temperature spans -40°C to +85°C.

Feature Summary

• Supports independent 8-bit resolution brightness control per output alongside unified group dimming and blinking capabilities.
• Enables asynchronous external PWM control via the active-low Output Enable pin for synchronized multi-device operations.
• Facilitates complex bus addressing through software-programmable LED groups and three sub-call I²C addresses.

Applications

• RGBA color mixing systems
• Backlight illumination drivers
• LED display matrix controllers

Procurement Notes

Verify component status as the manufacturer indicates end-of-life or obsolescence phases. Confirm package integrity upon receipt, as surface-mount components require inspection for solder joint quality. Ensure ESD handling protocols are strictly followed during installation. Cross-reference datasheet revisions to confirm register compatibility with existing firmware implementations before deployment.

Selection Notes

Select this component when precise individual LED brightness adjustment combined with global dimming is required. Ideal for applications demanding high-speed I²C communication up to 1 MHz. Suitable for designs requiring flexible addressing schemes to minimize bus traffic. Consider thermal dissipation limits within the SOIC-20 package for high-density layouts.

Part Context

Part of the PCA9634 family, representing the NXP Semiconductors line of I²C-controlled LED drivers. Designed for integration into microcontroller-based lighting systems. The 'D' suffix denotes the SOIC-20 plastic small outline package. The ',118' suffix specifies the standard reel packaging configuration for automated assembly processes.

Replacement Considerations

PCA9551PW,118 is listed as a manufacturer-recommended alternative.

FAQ

What is the maximum frequency for the I²C interface?

The device supports Fast-mode Plus (Fm+) operation with frequencies up to 1 MHz.

How many levels of brightness control are available per LED?

Each LED output has an 8-bit resolution, providing 256 steps of linear brightness control.