STMicroelectronics STM32L552QCI6Q

Overview

STM32L552QCI6Q 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 dual-bank Flash with 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 edge nodes such as industrial wireless sensors and medical wearables requiring certified firmware updates and tamper-resistant operation.

For engineers reviewing the STM32L552QCI6Q datasheet, STM32L552QCI6Q pinout, STM32L552QCI6Q application, or STM32L552QCI6Q equivalent, key selection criteria include TrustZone-enforced peripheral isolation, sub-μA low-power modes (17 nA Shutdown, 222 nA Standby with RTC), integrated SMPS efficiency (62 μA/MHz @ 3 V), 96-bit unique ID, and NIST SP800-90B–compliant TRNG for secure boot and TLS acceleration.

Technical Context

The STM32L552QCI6Q implements a dual-core security architecture: the Cortex-M33 core executes in both Secure and Non-secure states, enforced by SAU and GTZC peripherals that partition memory, I/Os, and peripherals. Its FlexPowerControl system enables dynamic voltage scaling and mode transitions-including BAM (Batch Acquisition Mode) for sensor data bursts-without CPU intervention.

It integrates three PLLs (system, USB/audio, ADC), OCTOSPI for high-speed external memory, FDCAN for robust fieldbus communication, and UCPD for USB Type-C™ power delivery negotiation. The ART Accelerator with 8 KB instruction cache ensures zero-wait-state execution from Flash at 110 MHz, while dual 12-bit ADCs (5 Msps, hardware oversampling to 16-bit) and two op-amps with PGA support analog front-end consolidation.

Key Specifications

Pinout & Package

STM32L552QCI6Q uses the UFQFPN48 (7 × 7 mm) package with 48-pin quad flat no-lead construction, optimized for compact PCB layouts and thermal performance in space-constrained applications.

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 RA4M3G20CBH#AC0, the STM32L552QCI6Q uniquely balances certified security, sub-µA low-power operation, and integrated USB-C PD/FDCAN-making it optimal for compact, battery-powered gateways and certified medical endpoints where BOM count and power budget are tightly constrained.

Availability

STM32L552QCI6Q is available at Aetrix Electronics and suitable for industrial wireless sensor nodes, secure medical wearables, smart utility meters, and USB-C powered industrial gateways requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32L552QCI6Q 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 analog components for industrial, automotive, and consumer markets.

The STM32L5 series is engineered for ultra-low-power, security-critical embedded applications-integrating TrustZone, tamper resistance, and energy-efficient SMPS to enable decade-long battery operation in certified IoT endpoints.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating?

The STM32L552QCI6Q runs at up to 110 MHz with an ART Accelerator and 8 KB instruction cache, achieving 165 DMIPS (1.5 DMIPS/MHz per Dhrystone 2.1). This performance is sustained across voltage scaling ranges (VOS0/VOS1) and confirmed under full temperature range (–40 °C to 125 °C) with SMPS or LDO regulation.

Does this MCU support hardware-based secure boot and firmware update?

Yes. It implements a root-of-trust via unique boot entry, Hide Protection Area (HDP) for secret storage, and Secure Firmware Installation (SFI) using embedded Root Secure Services (RSS). It supports TF-M–based secure firmware upgrades with cryptographic signature verification and rollback protection.

What are the key low-power modes and their typical current consumption?

Key modes include: 17 nA Shutdown (5 wakeup pins), 108 nA Standby (5 wakeup pins), 222 nA Standby with RTC, 3.16 µA Stop 2 with RTC, and 106 μA/MHz Run mode (LDO) or 62 μA/MHz (SMPS @ 3 V). All values are measured per DS12737 Rev 6 at 25 °C with specified peripherals disabled.

Which package variant does STM32L552QCI6Q use, and what are its thermal characteristics?

STM32L552QCI6Q uses the UFQFPN48 (7 × 7 mm) package with 0.5 mm pitch. Its θ_JA is 41.5 °C/W (JEDEC standard board), and θ_JC is 15.2 °C/W (top side). Maximum junction temperature is 125 °C, supporting operation in extended industrial environments per the -40 °C to +125 °C grade.