STMicroelectronics STM32L562QEI6TR

Overview

STM32L562QEI6TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 32-bit microcontroller with TrustZone® security, FPU, and integrated SMPS. It delivers 165 DMIPS at up to 110 MHz, features 512 KB Flash (dual-bank read-while-write), 256 KB SRAM (64 KB with hardware parity), and operates from 1.71 V to 3.6 V across –40°C to +125°C. It targets secure, battery-constrained IoT edge nodes requiring cryptographic acceleration and sub-µA standby operation.

For engineers reviewing the STM32L562QEI6TR datasheet, STM32L562QEI6TR pinout, STM32L562QEI6TR application, or STM32L562QEI6TR equivalent, key selection criteria include TrustZone-enabled secure boot, on-the-fly Octo-SPI decryption, ULPMark-CP® score of 370, and dual-regulator support (LDO + SMPS) for dynamic power optimization in portable medical sensors and industrial wireless transceivers.

Technical Context

The device implements Arm TrustZone® at the system level, partitioning memory, peripherals, and I/Os into secure/non-secure worlds with hardware-enforced isolation. Its GTZC (Global TrustZone Controller) and TZSC (TrustZone Security Controller) enable fine-grained peripheral securability, including AES coprocessor, PKA, HASH, and OTFDEC engines-all accessible only from secure world unless explicitly delegated.

Power architecture integrates dual regulation: a configurable LDO and an external-component SMPS step-down converter supporting 62 µA/MHz run-mode efficiency at 3 V. Low-power modes include Shutdown (17 nA), Standby with RTC (222 nA), and Stop 2 with RTC (3.16 µA), all with ≤5 µs wakeup latency-enabled by ART Accelerator's 8-KB instruction cache and auto-trimmed multispeed oscillator (±0.25% accuracy).

Key Specifications

Pinout & Package

STM32L562QEI6TR uses the WLCSP81 (4.36 × 4.07 mm) package-a wafer-level chip-scale package with 81 solder bumps, optimized for space-constrained portable designs. Pin assignment follows ST's standard STM32L5 series layout with dedicated VDD/VSS pairs per power domain, separate VREF+/VREF– for ADC/DAC, and dedicated TrustZone-secured debug pins (SWCLK/SWDIO).

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 LPC55S69JBD100, the STM32L562QEI6TR uniquely balances sub-100-nA shutdown, integrated SMPS, and production-ready OTFDEC-making it optimal for cost-sensitive, long-life secure edge nodes where power budget and firmware IP protection are co-primary constraints.

Availability

STM32L562QEI6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and secure access control terminals requiring stable component supply across extended product lifecycles.

Supply support for STM32L562QEI6TR 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 automotive semiconductors since 1987.

The STM32L5 series targets ultra-low-power, security-critical embedded applications-integrating Arm TrustZone®, cryptographic accelerators, and flexible power architectures specifically for battery-operated IoT endpoints and industrial edge devices.

FAQ

What is the maximum operating temperature range for STM32L562QEI6TR?

The STM32L562QEI6TR is qualified for industrial and extended temperature operation from –40°C to +125°C, as confirmed in Section 5.3.1 of DS12736 Rev 5. This rating applies to all package variants including WLCSP81, and is validated under full peripheral activation and SMPS operation.

Does STM32L562QEI6TR support crystal-less USB operation?

Yes-STM32L562QEI6TR integrates a factory-trimmed 48 MHz internal oscillator with clock recovery system (CRS), enabling full-speed USB 2.0 operation without an external crystal. This is documented in Section 3.12 and Table 5.3.9 of the datasheet, reducing BOM count and PCB footprint.

How many independent power domains does the WLCSP81 package support?

The WLCSP81 package supports three independent power domains: VDD/VSS (digital core), VDDA/VSSA (analog), and VDDUSB/VSSUSB (USB PHY). This separation is physically implemented via dedicated bump sets and is required to achieve specified ADC/DAC accuracy and USB signal integrity per Section 6.5 and Table 24 of DS12736 Rev 5.

Can the OCTOSPI interface operate in secure mode with TrustZone?

Yes-the OCTOSPI interface is classified as a TrustZone-aware peripheral (Table 8, DS12736 Rev 5) and can be assigned to secure or non-secure world via GTZC configuration. When secured, OTFDEC decryption and address filtering enforce that only authenticated code/data is fetched from external memory, preventing DMA-based side-channel attacks.