STMicroelectronics STM32L462RET6

Overview

STM32L462RET6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 512 KB Flash, 160 KB SRAM, and integrated analog peripherals including 12-bit ADC (5 Msps), dual 12-bit DAC, op-amp with PGA, and AES-128/256 hardware accelerator. It targets battery-powered IoT sensor nodes requiring precise timing, secure firmware updates, and audio preprocessing.

For engineers reviewing the STM32L462RET6 datasheet, STM32L462RET6 pinout, STM32L462RET6 application, or STM32L462RET6 equivalent, key selection criteria include its 2.05 µA Stop 2 mode current, 4 µs wake-up latency, LPUART/SAI/USB FS support, and UFBGA100 (7×7 mm) package compatibility with high-density PCB layouts.

Technical Context

The device implements FlexPowerControl architecture with seven low-power modes, including Shutdown (22 nA), Standby with RTC (375 nA), and Stop 2 (2.05 µA), enabled by a dual-voltage regulator system and autonomous peripheral operation in Stop states. Its ART Accelerator™ delivers zero-wait-state execution from Flash at 80 MHz.

Clock management includes dual PLLs (system/audio), four independent oscillators (HSI16, MSI, LSE, HSI48), and clock recovery for USB without external crystal. The interconnect matrix enables concurrent bus access for CPU, DMA, and peripherals without arbitration delay.

Key Specifications

Pinout & Package

STM32L462RET6 is packaged in UFBGA100 (7×7 mm, 0.5 mm pitch), suitable for space-constrained portable designs. Pin functions are validated per STMicroelectronics DS11913 Rev 5 Section 4 (Pinouts and pin description).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L462RET6, STM32L476RGT6 trades audio capability for double Flash and display support, while STM32L552RET6 replaces CAN with TrustZone security - making the L462 optimal for cost-sensitive, audio-integrated, CAN-connected edge nodes where moderate security suffices.

Availability

STM32L462RET6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensor hubs, and industrial predictive maintenance nodes requiring stable component supply across multi-year production cycles.

Supply support for STM32L462RET6 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 components for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding rich analog integration, cryptographic acceleration, and long battery life - optimized for IoT endpoints, wearables, and energy-harvesting systems.

FAQ

What is the maximum operating frequency and corresponding performance metric?

The STM32L462RET6 operates at up to 80 MHz with an Arm Cortex-M4 core featuring FPU and DSP extensions. Its performance is quantified at 100 DMIPS (Dhrystone 2.1) and 273.55 CoreMark® (3.42 CoreMark/MHz), validated under full-speed Flash execution with ART Accelerator enabled.

Does STM32L462RET6 support crystal-less USB operation?

Yes. The device integrates a 48 MHz HSI48 oscillator with clock recovery system (CRS), enabling full-speed USB 2.0 operation without an external crystal. This reduces bill-of-materials cost and PCB footprint while maintaining ±0.25% accuracy required for USB packet timing.

How many low-power modes does STM32L462RET6 offer, and what is the lowest active current?

It provides seven low-power modes: Shutdown (22 nA), Standby (106 nA), Standby with RTC (375 nA), Stop 0/1/2 (1.15–2.05 µA), and Low-power Run (84 µA/MHz). The lowest active mode is Stop 2 at 2.05 µA, retaining SRAM content and allowing wake-up via LPUART, EXTI, or RTC alarm.

What analog peripherals are integrated, and how are they isolated?

The MCU integrates a 12-bit 5 Msps ADC, two 12-bit DACs, one operational amplifier with programmable gain amplifier (PGA), two ultra-low-power comparators, and a voltage reference buffer (2.048 V or 2.5 V). All analog blocks share an independent VDDA supply domain, electrically isolated from digital rails to minimize noise coupling in precision measurements.