STMicroelectronics X-NUCLEO-LED16A1

Overview

X-NUCLEO-LED16A1 from STMicroelectronics is an STM32 Nucleo-compatible 16-channel LED driver expansion board based on the LED1642GW IC, providing constant-current sink outputs (3–40 mA per channel), 20 V rated current generator voltage, 12/16-bit PWM grayscale control, and daisy-chain capability for multi-board cascading. It supports RGB or monochrome LED arrays in lighting, signage, and human-machine interface applications.

For engineers reviewing the X-NUCLEO-LED16A1 datasheet, X-NUCLEO-LED16A1 pinout, X-NUCLEO-LED16A1 application, or X-NUCLEO-LED16A1 equivalent, this board enables rapid prototyping of scalable LED control systems with Arduino UNO R3 and STM32 Nucleo hardware integration, fault detection (open/shorted LED), thermal shutdown, and dual power sourcing (USB or external).

Technical Context

The board implements the LED1642GW TSSOP-24 driver IC in a configured evaluation layout, using SPI serial interface (SDI/SDO/SCK/LE/PWCLK) for register programming and PWM timing control. It supports global 7-bit current gain adjustment across two ranges and per-channel 12/16-bit grayscale depth via software-controlled PWM clocking.

Hardware-level error detection includes open-circuit and short-circuit LED monitoring, with automatic thermal shutdown protection. Power routing allows selection between USB +5 V and external supply, while daisy-chain jumpers (J2/J3) enable serial cascade of multiple X-NUCLEO-LED16A1 boards without additional MCU GPIO overhead.

Key Specifications

Availability

X-NUCLEO-LED16A1 is available at Aetrix Electronics and suitable for LED signage systems, industrial HMI status panels, and embedded visual feedback applications requiring stable component supply, rapid Nucleo-based development, and scalable multi-board LED control.

Supply support for X-NUCLEO-LED16A1 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, designing and manufacturing microcontrollers, analog ICs, power devices, sensors, and digital media solutions for industrial, automotive, and consumer markets.

The X-NUCLEO series targets rapid prototyping and ecosystem expansion for STM32 microcontrollers, delivering plug-and-play hardware modules with standardized connectors (Arduino UNO R3 and ST Morpho) and validated firmware examples.

FAQ

Does X-NUCLEO-LED16A1 require external firmware or drivers?

No. The board operates with standard STM32 HAL libraries and ST-provided X-CUBE-LED example firmware. It uses standard SPI commands compatible with any STM32 Nucleo board supporting Arduino UNO R3 pinout, and no proprietary drivers are needed for basic initialization or PWM control.

Can multiple X-NUCLEO-LED16A1 boards be connected to one Nucleo board?

Yes - up to four boards can be daisy-chained using J2 and J3 jumpers to route SDO→SDI signals. Each board retains independent LE and PWCLK control, allowing synchronized or staggered PWM updates across all 64+ channels without additional GPIO usage beyond the base SPI bus.

What is the maximum LED forward voltage supported per channel?

The LED1642GW driver IC on the board supports up to 20 V compliance voltage. When powered by the +5 V USB rail, usable headroom limits practical Vf to ≤4.5 V per LED; with external 12–20 V supply applied to J4, full 20 V compliance enables high-Vf white or blue LEDs or 5–6 LED series strings.

Is thermal management integrated on the board?

Yes - the LED1642GW IC includes internal thermal shutdown circuitry that disables outputs when die temperature exceeds ~150 °C. The board's exposed-pad TSSOP-24 footprint (U1) and copper pour under U1 provide passive heat dissipation, and no heatsink or fan is required for ≤40 mA/channel operation at ambient ≤60 °C.