STMicroelectronics X-NUCLEO-LED12A1

Overview

X-NUCLEO-LED12A1 from STMicroelectronics is an LED driver expansion board for STM32 Nucleo platforms, integrating four LED1202 12-channel drivers to control up to 48 LEDs (6×8 white + 4×4 RGB matrices), supporting independent 8-bit analog and 12-bit digital dimming per channel with 20 mA/channel drive capability and 350 mV typ. headroom voltage.

For engineers reviewing the X-NUCLEO-LED12A1 datasheet, X-NUCLEO-LED12A1 pinout, X-NUCLEO-LED12A1 application, or X-NUCLEO-LED12A1 equivalent, this board enables rapid prototyping of multi-LED visual interfaces using Arduino UNO R3 and STM32 Morpho connectors, with scalable stacking, RoHS/WEEE compliance, and free STM32Cube-compatible firmware.

Technical Context

The board implements I²C-controlled LED1202 drivers (I²C addresses 0x58–0x5B) with integrated 5 V output capability and low quiescent current operation. Each LED1202 provides 12 independently dimmable constant-current sinks with 20 mA max per channel and 350 mV typical headroom voltage at full load.

Power architecture includes dual supply paths: internal 3.3 V/5 V from Nucleo board or external 5–24 V via Phoenix connector J13, selected by jumper J15; on-board LDL112PT-TR LDO supplies stable 3.7 V for LED biasing.

Key Specifications

Availability

X-NUCLEO-LED12A1 is available at Aetrix Electronics and suitable for smart home lighting interfaces, industrial status displays, embedded visual feedback systems, and educational LED control labs requiring stable component supply and rapid STM32-based development.

Supply support for X-NUCLEO-LED12A1 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, power management ICs, sensors, and analog/mixed-signal devices for industrial, automotive, and consumer applications.

The X-NUCLEO series targets rapid prototyping of STM32-based systems, with the LED12A1 variant specifically engineered to simplify high-channel-count LED matrix control using standardized Nucleo expansion interfaces and STM32Cube ecosystem integration.

FAQ

What microcontroller platforms is the X-NUCLEO-LED12A1 compatible with?

The board is designed exclusively for STM32 Nucleo development boards with Arduino UNO R3 and Morpho headers. It communicates via I²C and requires no additional level-shifting for 3.3 V logic. Compatibility is verified across STM32 Nucleo-64 and Nucleo-144 families using STM32CubeMX and X-CUBE-LED12A1 firmware.

Does the board support external LED panels beyond the included 48-LED panel?

Yes - the double-row pin array connector (CN7/CN10) provides access to all 48 LED sink outputs and control signals, enabling connection of custom LED matrices. The J13 Phoenix connector accepts 5–24 V external supply, and jumper J15 routes power appropriately to maintain 350 mV headroom across channels under varying forward voltage loads.

How is dimming controlled on the X-NUCLEO-LED12A1?

Each of the 48 channels supports independent brightness control via combined 8-bit analog (current gain scaling) and 12-bit digital (PWM duty cycle) dimming registers accessible over I²C. This dual-stage method achieves >16-bit effective resolution while minimizing flicker and maintaining consistent color point across RGB LEDs.

Is firmware provided, and what development tools are supported?

ST provides the X-CUBE-LED12A1 software expansion package for STM32Cube, including HAL drivers, example projects for various Nucleo boards, and API functions for initializing drivers, setting current levels, and configuring dimming modes. Development is supported in STM32CubeIDE, Keil MDK, and IAR Embedded Workbench.