PCA9958HN/Q900Y

Overview

The PCA9958HN/Q900Y is a 24-channel constant current LED driver IC designed for automotive and industrial applications. It features a 10 MHz SPI interface and operates within a supply voltage range of 2.7 V to 5.5 V. Each channel provides up to 63 mA output current with 8-bit PWM resolution at a fixed frequency of 31.25 kHz. The device supports programmable brightness, fade-in/fade-out effects, and includes diagnostic features such as open/short detection and thermal shutdown. It is housed in a 40-pin HVQFN package rated for temperatures from -40°C to +85°C.

Feature Summary

• Provides 24 independent constant current output channels capable of sinking up to 63 mA per channel.
• Integrates an 8-bit linear DAC for precise peak current regulation across the full output range.
• Supports complex lighting effects including programmable fade-in, fade-out, and blinking sequences via dedicated PWM controllers.
• Includes built-in diagnostic circuits for detecting open loads, short circuits, and thermal overload conditions.

Applications

• Automotive interior ambient lighting systems
• RGB or RGBA LED matrix displays
• Instrument cluster status indicators
• Door and console illumination modules

Procurement Notes

Verify that the specific suffix Q900Y corresponds to the required tape-and-reel packaging configuration and AEC-Q100 qualification level. Confirm that the operating temperature range meets the specific environmental requirements of the target application, as standard variants may differ. Ensure compatibility with the host microcontroller's SPI voltage levels and timing constraints before finalizing procurement.

Selection Notes

Select this component when a high-density solution is required for controlling multiple LEDs with individual brightness and color control capabilities. It is suitable for designs needing advanced lighting effects like breathing lights without external microcontroller processing overhead. Consider the HVQFN40 package size and thermal dissipation characteristics relative to the PCB layout and available space constraints.

Part Context

This part belongs to NXP's PCA995x family of LED drivers, which are optimized for automotive and industrial lighting. Unlike I2C-based counterparts, this model utilizes a serial peripheral interface for higher bandwidth communication. It serves as a specialized driver for complex RGB/RGBA configurations where precise current matching and dynamic lighting effects are critical for user experience.

Replacement Considerations

PCA9958HNY is a parameter-equivalent alternative within the same product line.

FAQ

What is the maximum output current per channel?

Each of the 24 channels can sink a constant current of up to 63 mA.

Does the device support daisy-chaining?

Yes, it supports a four-wire SPI interface that allows for daisy-chaining multiple devices to expand the number of controlled LEDs.

How is the output current precision specified?

The absolute accuracy is ±7.5% at 60 mA and ±9% at 30 mA, with a maximum channel-to-channel mismatch of ±5%.