STMicroelectronics STM32L552VCT6Q

Overview

STM32L552VCT6Q 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 and 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 real-time processing, cryptographic services, and sub-μA standby operation.

For engineers reviewing the STM32L552VCT6Q datasheet, STM32L552VCT6Q pinout, STM32L552VCT6Q application, or STM32L552VCT6Q equivalent, key selection criteria include TrustZone-enabled secure boot, 222 nA Standby-with-RTC power, dual-bank read-while-write Flash, integrated SMPS step-down converter, and 114 GPIOs with independent supply down to 1.08 V.

Technical Context

The STM32L552VCT6Q implements a dual-core security architecture: the Cortex-M33 core executes in both Secure and Non-secure states, enforced by SAU and GTZC peripherals. Its ART Accelerator includes an 8-KB instruction cache enabling zero-wait-state execution from Flash at 110 MHz.

Power management combines three regulators: embedded LDO with configurable output ranges, integrated SMPS step-down converter (62 μA/MHz @ 3 V), and external SMPS support. Low-power modes include Shutdown (17 nA), Standby (222 nA with RTC), and Stop 2 (3.16 μA with RTC), all featuring 5 wakeup pins and 5 μs wake-up latency.

Key Specifications

Pinout & Package

LQFP48 package: 48-pin, 7 × 7 mm body, 0.5 mm pitch, exposed pad for thermal dissipation. RoHS-compliant, industrial temperature grade (–40 °C to +125 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L552VCT6Q, the STM32U575ZIT6Q offers greater memory and compute headroom but sacrifices USB-C PD integration and compact LQFP48 form factor; the LPC55S69JBD100 provides robust cloud identity out-of-box but lacks SMPS efficiency and on-chip analog signal chain components.

Availability

STM32L552VCT6Q is available at Aetrix Electronics and suitable for smart utility meters, secure wearables, industrial wireless sensor nodes, and low-power edge AI gateways requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32L552VCT6Q 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 chips since 1987.

The STM32L5 series targets ultra-low-power, security-critical embedded applications - combining Arm TrustZone with energy-efficient SMPS and certified cryptographic services for IoT endpoints and industrial edge devices.

FAQ

What is the maximum operating frequency and corresponding power efficiency of STM32L552VCT6Q?

The STM32L552VCT6Q runs at up to 110 MHz using its internal 48 MHz oscillator with PLL multiplication. In SMPS step-down converter mode, it achieves 62 μA per MHz at 3 V, verified per DS12737 Rev 6 Section 5.3.6. This efficiency enables sustained high-performance operation while maintaining sub-7 μA total current in Stop 2 mode with RTC active.

Does STM32L552VCT6Q support secure firmware updates over-the-air (OTA)?

Yes. The device supports secure OTA updates via TrustZone-protected bootloader, SFI (Secure Firmware Installation) using embedded RSS, and TF-M (Trusted Firmware-M). Firmware images are validated using HASH hardware accelerator and stored in dual-bank Flash to enable atomic A/B updates without service interruption.

Which package variant does STM32L552VCT6Q use, and what are its thermal characteristics?

STM32L552VCT6Q uses the LQFP48 package (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad. Its θ_JA is 47 °C/W and θ_JC is 12 °C/W (DS12737 Rev 6 Section 6.8), enabling reliable operation up to +125 °C ambient when mounted on 2-layer PCB with 1-in² copper pour under the exposed pad.

Can STM32L552VCT6Q operate without an external crystal for USB or RTC functions?

It supports crystal-less USB 2.0 full-speed operation using its internal 48 MHz oscillator with clock recovery (CRS), eliminating need for external USB crystal. However, RTC requires the 32.768 kHz LSE crystal on PC14/PC15 for calendar accuracy and low-power timekeeping - no internal RC alternative meets RTC precision requirements.