STMicroelectronics STEVAL-LLL014V1

Overview

STEVAL-LLL014V1 from STMicroelectronics is a four-string automotive LED driver evaluation kit based on the ALED7709ATR boost-mode LED driver and SPC582B60E1 32-bit Power Architecture MCU. It supports 4.5–42 V input, delivers 150 mA per channel with mixed PWM/analog dimming, adaptive boost voltage control, and NTC-based LED temperature monitoring for AEC-Q100 Grade 1 lighting systems.

For engineers reviewing the STEVAL-LLL014V1 datasheet, STEVAL-LLL014V1 pinout, STEVAL-LLL014V1 application, or STEVAL-LLL014V1 equivalent, this kit enables rapid validation of multi-string LED driver configurations, I²C-controlled dimming schemes, thermal-aware boost regulation, and automotive-grade MCU-driven lighting control in headlamp and DRL subsystems.

Technical Context

The kit integrates the ALED7709ATR - a 4-channel low-side constant-current LED driver with integrated boost DC/DC controller (400 kHz spread-spectrum switching) - and the SPC582B60E1 MCU, which generates synchronized PWM signals for analog dimming and FSW synchronization via I²C. Boost operation is disabled below 6 V input to prevent unstable regulation.

Adaptive boost voltage adjustment dynamically tracks forward voltage variations across LED strings, minimizing power dissipation in the ALED7709ATR. Onboard NTC sensing enables closed-loop thermal derating, while the modular design allows disconnection of the onboard MCU for external I²C host control.

Key Specifications

Availability

STEVAL-LLL014V1 is available at Aetrix Electronics and suitable for automotive headlamp modules, daytime running light (DRL) systems, and adaptive front-lighting systems (AFS) requiring stable component supply, validated reference designs, and production-ready firmware integration paths.

Supply support for STEVAL-LLL014V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and automotive-grade analog devices for industrial, automotive, and consumer applications.

The STEVAL-LLL014V1 belongs to ST's Automotive LED Lighting Evaluation Kit product line, engineered to accelerate development of AEC-Q100-compliant LED driver subsystems with integrated thermal protection, EMI-optimized switching, and MCU-coordinated dimming.

FAQ

What software is required to configure the STEVAL-LLL014V1?

The STSW-LLL014GUI Windows-based graphical user interface is required. It communicates over USB to the onboard ST-LINK/V2-1 debugger, enabling real-time register configuration, LED current tuning, dimming mode selection, and thermal threshold adjustment without firmware recompilation.

Can the onboard SPC582B60E1 be bypassed for external MCU control?

Yes - the evaluation board provides dedicated I²C test points and jumper-selectable isolation between the ALED7709ATR and SPC582B60E1. Removing JP1 disconnects the MCU's I²C lines, allowing direct control from an external host system using standard I²C protocol and register map defined in DB5016.

Does the kit support SEPIC topology in addition to boost?

No - although the ALED7709ATR IC supports both boost and SEPIC modes internally, the STEVAL-LLL014V1 hardware is configured exclusively for boost operation with fixed inductor and diode layout. SEPIC implementation would require PCB redesign and component substitution per the ALED7709ATR datasheet guidelines.

What is the maximum total LED string voltage supported?

The board supports up to 40 V total output voltage per string, limited by the ALED7709ATR's 42 V absolute maximum boost output rating and the selected external MOSFET and diode ratings. At 150 mA per channel and 40 V, total power per string is 6 W, with thermal design validated per DB5016 Rev 2.