STMicroelectronics STM32U535RET6

Overview

STM32U535RET6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 microcontroller with TrustZone® security, 512 KB flash, 274 KB SRAM, and FPU-designed for secure, battery-constrained IoT edge nodes requiring real-time sensor fusion, cryptographic operations, and sub-μA sleep modes. It delivers 240 DMIPS at 160 MHz, supports LPBAM autonomous peripheral operation down to Stop 2 mode, and integrates hardware accelerators including CORDIC and FMAC.

For engineers reviewing the STM32U535RET6 datasheet, STM32U535RET6 pinout, STM32U535RET6 application, or STM32U535RET6 equivalent, key selection considerations include its 48-pin LQFP package, 1.71–3.6 V supply range, –40 °C to +85 °C industrial temperature grade, TrustZone-enabled secure boot, and dual ADC/DAC analog subsystem with 14-bit resolution and hardware oversampling.

Technical Context

The device implements a dual-bank flash architecture with ECC and read-while-write capability, enabling seamless firmware updates without runtime interruption. Its power architecture combines an embedded LDO and SMPS step-down converter with dynamic voltage scaling and on-the-fly switching between regulators.

TrustZone security is enforced via the Global TrustZone Controller (GTZC), which partitions memory, peripherals, and I/Os into secure/non-secure worlds; boot integrity relies on unique entry point verification and Secure Hide Protection Area (HDP) isolation. The ART Accelerator includes 8-KB instruction cache and 4-KB data cache for zero-wait-state execution from flash and external memories.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32U535RET6, the U575 offers higher compute density and connectivity for edge gateways but increases BOM cost and power; the RA4M3 provides strong real-time determinism and graphics support but lacks TrustZone's hardware-enforced memory isolation and has higher active-mode current (2.8 µA/MHz vs. 1.63 µA/MHz).

Availability

STM32U535RET6 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 long-lifecycle deployments.

Supply support for STM32U535RET6 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 STM32U5 series targets ultra-low-power, high-security embedded applications-including IoT endpoints, medical wearables, and industrial edge nodes-by integrating TrustZone, advanced power gating, and hardware-accelerated cryptography into a single chip.

FAQ

What is the maximum operating frequency and associated performance metric for STM32U535RET6?

The STM32U535RET6 operates at up to 160 MHz, delivering 240 DMIPS (1.5 DMIPS/MHz) and 651 CoreMark® (4.07 CoreMark®/MHz). This performance is sustained with zero wait states using the 8-KB instruction cache (ART Accelerator) and is validated under 3.3 V supply conditions per DS14217 Rev 5.

Does STM32U535RET6 support hardware-based secure boot and firmware update verification?

Yes. It implements a hardware-rooted secure boot via unique boot entry and Secure Hide Protection Area (HDP), enabling Secure Firmware Installation (SFI) and TF-M–based firmware upgrades. The embedded root-secure services (RSS) validate digital signatures using public-key cryptography before execution, with keys stored in tamper-protected OTP memory.

What are the lowest achievable power consumption modes and their typical current draw?

The lowest modes are 90 nA Shutdown (23 wake-up pins active), 370 nA Standby with RTC enabled, and 1.4 μA Stop 3 retaining 16 KB SRAM. These values are measured at 3.3 V and 25 °C per Section 5.3.7 of DS14217 Rev 5, and require proper configuration of power regulators (SMPS/LDO) and clock gating.

Which analog peripherals are available and what are their key resolution/speed specifications?

It integrates a 14-bit 2.5-Msps ADC with hardware oversampling (achieving up to 16-bit effective resolution), two 12-bit DACs with sample-and-hold, one operational amplifier with programmable gain amplifier (PGA), and one ultra-low-power comparator. All analog blocks support autonomous operation in Stop 2 mode, with dedicated VDDA and VREFINT references.