STMicroelectronics L99LD21-ADIS

Overview

L99LD21-ADIS from STMicroelectronics is an automotive LED driver expansion board designed to interface with the SPC560B-DIS discovery board, enabling control of four independent high-brightness LED strings for front lighting applications. It integrates two soldered L99LD21 flexible LED drivers, features dual 36-pin extension headers (100 mil pitch), and supports GUI-based configuration via Windows PC using a USB mini-B cable.

For engineers reviewing the L99LD21-ADIS datasheet, L99LD21-ADIS pinout, L99LD21-ADIS application, or L99LD21-ADIS equivalent, this board provides ready-to-run firmware, GUI-controlled dimming and fault monitoring, and hardware-level compatibility with SPC560B-DIS for rapid prototyping of adaptive front-lighting systems (AFS) in automotive embedded development.

Technical Context

The L99LD21-ADIS functions as a plug-in evaluation platform-not a standalone IC-leveraging the SPC560B-DIS microcontroller board for real-time PWM generation, current regulation, and diagnostics. Each onboard L99LD21 driver delivers up to 150 mA per channel with integrated open-load, short-to-battery, and overtemperature protection.

Hardware resources include two 2×36-pin 100-mil headers for bidirectional signal routing (PWM, enable, status flags, I²C/SPI interface lines), and mechanical design optimized for stacking onto the SPC560B-DIS baseboard. No on-board power conversion circuitry is present; input voltage must be supplied externally at 5 V and 12 V rails.

Key Specifications

Availability

L99LD21-ADIS is available at Aetrix Electronics and suitable for automotive lighting prototyping, AFS algorithm validation, and SPC560B-based ECU development requiring stable component supply and traceable evaluation hardware sourcing.

Supply support for L99LD21-ADIS 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, specializing in automotive-grade analog, power, and microcontroller solutions with ISO/TS 16949-certified manufacturing.

The L99LD21-ADIS belongs to ST's automotive LED driver evaluation platform family, engineered specifically to accelerate functional safety-compliant front-lighting system development for ASIL-B applications.

FAQ

Is L99LD21-ADIS a standalone controller or does it require additional hardware?

No, L99LD21-ADIS is not standalone. It requires the SPC560B-DIS discovery board for MCU-level control, power sequencing, and communication. The board contains no processor, clock source, or USB interface-only LED driver ICs and interconnect headers.

What voltage rails must be supplied to operate L99LD21-ADIS?

The board requires two external DC supplies: 5 V for logic and communication interfaces, and 12 V for LED string biasing. These are delivered via the SPC560B-DIS board's power distribution network when stacked; no onboard regulators convert between rails.

Does L99LD21-ADIS support CAN or LIN communication for automotive integration?

No. L99LD21-ADIS uses parallel GPIO and SPI/I²C signals routed through its 36-pin headers to the SPC560B-DIS. CAN/LIN functionality depends entirely on the host SPC560B-DIS firmware implementation-not the expansion board itself.

Can L99LD21-ADIS drive RGB or addressable LEDs?

No. It is designed exclusively for constant-current driving of monochrome high-brightness LED strings (e.g., white DRL or headlamp LEDs). It lacks pixel-level addressing, color mixing circuitry, or WS2812/NeoPixel protocol support.