STMicroelectronics STM32L476MEY6TR

Overview

STM32L476MEY6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit microcontroller with FPU, operating up to 80 MHz (100 DMIPS), featuring 512 KB flash, 128 KB SRAM, USB OTG FS, LCD controller, and integrated SMPS support. It delivers 39 µA/MHz run current in SMPS mode and supports -40 °C to 105 °C operation - deployed in battery-powered medical sensors and portable industrial HMI displays.

For engineers reviewing the STM32L476MEY6TR datasheet, STM32L476MEY6TR pinout, STM32L476MEY6TR application, or STM32L476MEY6TR equivalent, key selection criteria include verified low-power mode timing (4 µs Stop wakeup), dual 12-bit DAC channels, 3× 12-bit ADCs at 5 Msps, CAN 2.0B interface, and UFBGA144 package compatibility with PCB layout constraints for compact wearable designs.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz, alongside a memory protection unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture includes three voltage regulators (LDO/SMPS/VREFBUF) and FlexPowerControl supporting seven low-power modes - Shutdown (30 nA), Standby with RTC (420 nA), and Stop 2 (1.1 µA).

Clock system comprises four independent sources: 4–48 MHz HSE, 32 kHz LSE for RTC, 16 MHz HSI (±1%), and auto-trimmed MSI (±0.25%). Three PLLs independently feed CPU, USB, and audio domains, while the 14-channel DMA controller enables concurrent peripheral-to-memory transfers without CPU intervention.

Key Specifications

Pinout & Package

STM32L476MEY6TR is housed in a 144-ball Ultra-Fine-Pitch Ball Grid Array (UFBGA144) package with 0.8 mm ball pitch and 10 mm × 10 mm body size, compliant with ECOPACK2 environmental standards. Pin functions are validated per STMicroelectronics DS10198 Rev 11 Section 4 (Pinouts and pin description), Table 16.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power Arm Cortex-M4 microcontroller applications.

Compared with STM32L476VGT6, the MEY6TR offers superior space efficiency and lower system-level cost in volume production; versus STM32L562VEY6TR, it provides optimal energy-per-cycle for battery-critical applications where hardware security extensions are not mandated.

Availability

STM32L476MEY6TR is available at Aetrix Electronics and suitable for portable medical monitors, smart energy meters, industrial HMI panels, and automotive cabin controllers requiring stable component supply across multi-year product lifecycles.

Supply support for STM32L476MEY6TR 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 analog chips for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding extended battery life, rich analog integration, and robust connectivity - optimized for intelligent edge nodes in healthcare, metering, and human-machine interfaces.

FAQ

What is the maximum operating frequency and corresponding performance metric of STM32L476MEY6TR?

The STM32L476MEY6TR operates at up to 80 MHz, delivering 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz). This performance level is sustained via the ART Accelerator™, which enables zero-wait-state execution from internal flash memory, making it suitable for real-time control algorithms and sensor data preprocessing without external RAM.

Does STM32L476MEY6TR support external memory expansion, and what interfaces are available?

Yes, STM32L476MEY6TR supports external memory via two dedicated interfaces: the Flexible Static Memory Controller (FSMC) for NOR, PSRAM, and NAND flash, and the Quad SPI interface for high-speed serial flash. The FSMC provides address/data bus multiplexing and wait-state control, while Quad SPI achieves up to 80 MHz clock rates with 4-bit data transfer - both validated in ST's AN4760 and RM0351 reference manuals.

How does the power architecture of STM32L476MEY6TR enable ultra-low-power operation in battery-powered systems?

It implements FlexPowerControl with seven low-power modes, including Shutdown (30 nA), Standby with RTC (420 nA), and Stop 2 (1.1 µA). Integrated SMPS support reduces run-mode current to 39 µA/MHz, while the 4 µs wakeup from Stop mode minimizes latency penalties. These features are confirmed in DS10198 Rev 11 Tables 27–37 and enable >5-year operation on a single CR2032 in periodic-sensing applications.

What development tools and debug interfaces are supported by STM32L476MEY6TR?

The MCU supports Serial Wire Debug (SWD) and JTAG via its SWJ-DP interface, fully compatible with ST-LINK/V2-1 and third-party debug probes. It also includes Embedded Trace Macrocell™ (ETM) for instruction trace and ITM for printf-style debugging. ST's STM32CubeIDE, HAL libraries, and STM32CubeMX configuration tool provide validated support - all documented in UM1727 and RM0351.