STMicroelectronics STM32L562ZET6

Overview

STM32L562ZET6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 32-bit microcontroller with TrustZone® security, 110 MHz max clock, 512 KB Flash (dual-bank read-while-write), 256 KB SRAM (64 KB with hardware parity), and integrated SMPS step-down converter. It delivers 165 DMIPS and supports secure firmware installation via embedded RSS and TF-M. Used in battery-powered industrial sensors requiring long runtime, cryptographic integrity, and real-time analog acquisition.

For engineers reviewing the STM32L562ZET6 datasheet, STM32L562ZET6 pinout, STM32L562ZET6 application, or STM32L562ZET6 equivalent, key selection criteria include TrustZone-enabled peripheral isolation, sub-100 nA standby current with RTC, dual 12-bit ADCs at 5 Msps, AES+PKA hardware acceleration, and LQFP144 package compatibility with legacy STM32L4/L5 footprint migration paths.

Technical Context

The STM32L562ZET6 implements a dual-domain Arm Cortex-M33 core with separate secure/non-secure execution states enforced by TrustZone®, MPU, and GTZC peripherals. Its ART Accelerator includes an 8-KB instruction cache enabling zero-wait-state execution from Flash at 110 MHz.

Power architecture integrates both LDO and SMPS regulators-SMPS mode achieves 62 μA/MHz run current at 3 V-while low-power modes leverage batch acquisition (BAM) and three independent voltage scaling domains. Security includes on-the-fly OCTOSPI decryption (OTFDEC), NIST SP800-90B-compliant TRNG, and 512-byte OTP for user keys.

Key Specifications

Pinout & Package

LQFP144 package (20 × 20 mm, 0.5 mm pitch) with 128 user I/Os, 4 dedicated power/ground pins per side, and dedicated VDDA/VSSA for analog domain isolation. Supports independent 1.08–3.6 V supply for up to 14 I/Os.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L562ZET6, the STM32U575ZIT6 offers higher compute headroom and flexible power architecture but sacrifices hardware-accelerated external memory decryption; the STM32L552RET6 reduces footprint and cost but eliminates USB-C PD control and limits I/O scalability for multi-peripheral systems.

Availability

STM32L562ZET6 is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, secure medical wearables, smart utility meters, and asset tracking modules requiring stable component supply across extended product lifecycles.

Supply support for STM32L562ZET6 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 management ICs, sensors, and automotive semiconductors.

The STM32L5 series targets ultra-low-power secure embedded applications-combining Arm TrustZone with sub-100 nA standby, hardware crypto acceleration, and flexible power management for IoT edge devices.

FAQ

What is the maximum operating frequency and corresponding power efficiency of the STM32L562ZET6?

The STM32L562ZET6 operates at up to 110 MHz with 165 DMIPS performance. In SMPS step-down mode at 3 V, it achieves 62 μA/MHz run current-verified per DS12736 Rev 5 Table 10-and supports 5 μs wakeup from Stop mode. This efficiency enables sustained high-speed processing while maintaining multi-year battery life in intermittent-use applications.

How does TrustZone implementation differ between STM32L562ZET6 and earlier STM32L4 MCUs?

The STM32L562ZET6 uses Arm's native Cortex-M33 TrustZone with hardware-enforced secure/non-secure state separation, unlike STM32L4's software-emulated TZ. It includes GTZC for memory/peripheral attribution and TZSC for peripheral security gating-enabling true hardware-isolated secure boot, key storage, and cryptographic operations without software overhead or vulnerability to privilege escalation.

Which analog features support simultaneous high-precision acquisition in low-power modes?

The STM32L562ZET6 supports concurrent 12-bit ADC sampling at 5 Msps using two independent ADCs, with hardware oversampling to 16-bit resolution. Both ADCs remain active in Stop 2 mode (3.16 μA) when triggered by LPTIM or RTC alarms-enabling precise, time-synchronized sensor capture without waking the CPU, verified in Section 3.21 of DS12736 Rev 5.

Can the OCTOSPI interface be used with encrypted external flash, and how is decryption handled?

Yes-the STM32L562ZET6 includes an On-the-Fly Decryption Engine (OTFDEC) that decrypts OCTOSPI-connected flash in real time using AES-128/192/256 keys stored in secure memory. Decryption occurs transparently during read access with no CPU involvement or timing penalty, as confirmed in Section 3.32 and Table 31 of DS12736 Rev 5.