STMicroelectronics STM32L562CEU6

Overview

STM32L562CEU6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 32-bit microcontroller with TrustZone® security, FPU, and SMPS support. It delivers 165 DMIPS at up to 110 MHz, integrates 512 KB Flash (dual-bank read-while-write), 256 KB SRAM (64 KB with hardware parity), and operates from 1.71–3.6 V across –40°C to 125°C. It targets secure, battery-constrained IoT edge nodes requiring cryptographic acceleration (AES+PKA), on-the-fly Octo-SPI decryption, and sub-µA low-power modes.

For engineers reviewing the STM32L562CEU6 datasheet, STM32L562CEU6 pinout, STM32L562CEU6 application, or STM32L562CEU6 equivalent, key selection criteria include TrustZone-enabled secure boot, 17 nA shutdown current, SMPS vs LDO power mode trade-offs, and UFQFPN48 package compatibility with high-density PCB layouts.

Technical Context

The device implements a dual-core security architecture via Arm TrustZone®, enabling strict isolation between secure and non-secure firmware execution, memory regions, and peripherals-enforced by the Global TrustZone Controller (GTZC) and SAU configuration. Boot integrity is anchored by a unique entry point and Hide Protection Area (HDP).

Power management combines an integrated SMPS step-down converter (62 µA/MHz @ 3 V) and LDO regulator, supporting dynamic voltage scaling and multiple low-power states-including 222 nA standby with RTC and 3.16 µA Stop 2-with 5 µs wakeup latency. Clocking includes four PLLs, auto-trimmed multispeed oscillator (±0.25%), and USB/SAI/ADC-dedicated clock domains.

Key Specifications

Pinout & Package

STM32L562CEU6 is housed in a 48-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package measuring 7 × 7 mm with 0.5 mm pitch, optimized for space-constrained industrial and portable designs. Pin definitions follow ST's standard STM32L5 series layout with dedicated VDD/VSS pairs, multiple I/O groups supporting independent supply domains (down to 1.08 V), and dedicated TrustZone-secured debug (SWD) and reset (NRST) terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32U575ZIT6 and RA4M3GFP, the STM32L562CEU6 uniquely balances sub-20 nA shutdown, integrated SMPS, and hardware TrustZone-making it optimal for long-life, physically exposed, and cryptographically demanding edge endpoints where power and security co-constraints dominate.

Availability

STM32L562CEU6 is available at Aetrix Electronics and suitable for smart utility meters, wearable health monitors, industrial wireless sensor nodes, and secure access control terminals requiring stable component supply across extended product lifecycles.

Supply support for STM32L562CEU6 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 automotive semiconductors with emphasis on energy efficiency and functional safety.

The STM32L5 series targets ultra-low-power, security-critical embedded applications-delivering Arm TrustZone, cryptographic accelerators, and sub-µA power modes for battery-operated IoT endpoints and industrial edge devices.

FAQ

What is the maximum operating frequency and corresponding power mode configuration?

The STM32L562CEU6 achieves 110 MHz maximum CPU frequency using the internal 48 MHz oscillator with PLL multiplication. This requires the SMPS step-down converter enabled and voltage scaling set to Range 1. In LDO mode, max frequency is reduced to 80 MHz due to voltage headroom limitations, increasing active current to 106 µA/MHz.

How does TrustZone implementation differ from software-only security frameworks?

TrustZone provides hardware-enforced isolation between secure and non-secure worlds-partitioning memory, peripherals, and interrupts at silicon level. Unlike software frameworks, it prevents unauthorized access even if the OS or application layer is compromised, and enables secure boot with immutable root-of-trust via HDP and RDP protection levels.

Which low-power mode retains RTC functionality while minimizing current draw?

Standby mode with RTC enabled draws 222 nA and maintains calendar, alarms, and 32×32-bit backup registers powered by VBAT. This mode disables all clocks except LSE and RTC domain, preserving timekeeping and wake-on-alarm capability without RAM retention-ideal for decade-long battery operation in metering applications.

Can the OCTOSPI interface support encrypted external Flash without CPU intervention?

Yes-the On-the-Fly Decryption Engine (OTFDEC) decrypts Octo-SPI reads in hardware using AES-128/256 keys stored in secure memory. Decrypted data is delivered directly to the bus matrix without exposing plaintext in SRAM or requiring firmware involvement, satisfying secure boot and code confidentiality requirements.