PCA9745BTW/Q900J

Overview

The PCA9745BTW/Q900J is a daisy-chain SPI-compatible 16-channel constant current LED driver optimized for RGBA LEDs in amusement products. It features individual 8-bit PWM controllers at 31.25 kHz and group PWM controllers with adjustable frequencies from 15 Hz to 16.8 seconds. The device operates on a 3 V to 5.5 V supply, supporting up to 20 V LED voltage. Output peak current is adjustable via an 8-bit DAC from 225 µA to 57 mA. It includes four selectable gradation control groups for automated brightness ramping without MCU intervention.

Feature Summary

• Supports daisy-chain SPI serial bus interface for efficient connectivity
• Provides independent 8-bit resolution PWM control for each of the 16 channels
• Includes group PWM functionality for synchronized dimming or blinking across all LEDs
• Features programmable output current adjustment via internal digital-to-analog converters

Applications

• Amusement product lighting systems
• RGBA LED color mixing applications
• LED displays requiring synchronized dimming
• Blinking light effects in entertainment equipment

Procurement Notes

Verify that the specific suffix Q900J corresponds to the required automotive-grade qualification and packaging configuration. Confirm the operating temperature range aligns with your system's environmental requirements. Ensure the SPI interface timing matches your controller's specifications before finalizing the order.

Selection Notes

Select this component when designing systems requiring precise individual channel control combined with global synchronization capabilities. It is suitable for applications needing high-resolution brightness adjustment and automated gradation control. Consider the 57 mA maximum sink current and 20 V output voltage limits when determining compatibility with the target LED array.

Part Context

This part belongs to NXP's PCA9745 family of LED drivers, designed specifically for complex lighting scenarios. The series supports various interfaces and channel counts to accommodate different system complexities. This specific variant integrates automotive-grade reliability standards into the standard functional architecture.

Replacement Considerations

Check for direct substitutes within the PCA9745 family that may offer different package options or interface variations. Verify pinout compatibility if replacing existing designs. Ensure any alternative maintains the same SPI protocol and current drive capabilities.