PCA9634PW,118

Overview

The PCA9634PW,118 is an I²C-bus controlled 8-bit LED driver optimized for RGBA color mixing applications. It features eight independent outputs with individual 8-bit PWM controllers operating at a fixed frequency of 97 kHz and a group PWM controller for unified dimming or blinking. The device supports Fast-mode Plus (Fm+) interfaces up to 1 MHz and operates within a supply voltage range of 2.3 V to 5.5 V. Outputs are 5.5 V tolerant with configurable open-drain or totem-pole configurations.

Feature Summary

• Provides independent 8-bit resolution PWM control for each LED output alongside a shared group PWM controller for synchronized dimming or blinking functions.
• Supports Fast-mode Plus (Fm+) I²C bus interface allowing higher data rates and dense bus operation capabilities.
• Features software programmable LED grouping and multiple sub-call addresses to minimize bus commands during complex color mixing sequences.

Applications

• RGBA color mixing systems requiring precise individual channel brightness control
• LED displays utilizing synchronized global dimming or strobing effects
• I²C bus controlled lighting architectures needing high-speed communication

Procurement Notes

Verify the specific package variant as the base model PCA9634 is available in multiple packages including TSSOP24. Confirm the suffix ,118 corresponds to the required tape and reel quantity. Check current lifecycle status as NXP product availability may vary by region and date.

Selection Notes

Select this component when independent per-channel brightness adjustment is required alongside global intensity control. Ensure the system requires Fm+ speed capabilities and that the 25 mA sink current per pin meets the load requirements without external drivers.

Part Context

This part belongs to the PCA9634 series of LED controllers designed specifically for applications demanding high-resolution color mixing. It represents an evolution in I²C LED drivers by integrating Fast-mode Plus support for improved bus efficiency in multi-device setups.

Replacement Considerations

Direct substitutes include other PCA9634 variants with different packaging options such as HVQFN16. Verify pin compatibility and electrical specifications before replacing with older PCA9632 or PCA9635 models.

FAQ

Can the PCA9634 be used for general-purpose GPIO expansion?

No, the PCA9634 is strictly an LED driver. For GPIO expansion, consider the PCA9551 or PCF8574 series which offer dedicated input/output capabilities.

What is the maximum frequency supported by the I²C interface?

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