STMicroelectronics STM32U535CET6

Overview

STM32U535CET6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 microcontroller with TrustZone® security, 240 DMIPS performance, 512 KB flash (ECC), 274 KB SRAM (64 KB ECC-enabled), and integrated SMPS power management. It operates from 1.71 V to 3.6 V across –40 °C to +125 °C and supports autonomous low-power modes down to 90 nA (Shutdown) and 1.4 µA (Stop 3 with 16-KB SRAM), targeting secure, battery-constrained IoT edge nodes and industrial sensors.

For engineers reviewing the STM32U535CET6 datasheet, STM32U535CET6 pinout, STM32U535CET6 application, or STM32U535CET6 equivalent, key selection criteria include TrustZone-enforced peripheral isolation, LPBAM-enabled autonomous peripheral operation in Stop 2 mode, dual ADC architecture (14-bit @ 2.5 Msps + 12-bit autonomous in Stop 2), CAN FD support, and octo-SPI interface for external memory expansion.

Technical Context

The STM32U535CET6 implements a dual-cache ART Accelerator (8-KB instruction cache + 4-KB data cache) enabling zero-wait-state execution at up to 160 MHz. Its power architecture integrates both LDO and SMPS step-down converters with dynamic voltage scaling and on-the-fly switching, directly supporting sub-µA retention states while maintaining RTC, backup registers, and tamper detection in VBAT mode.

Security is enforced via Arm TrustZone®, hardware root of trust (secure boot entry + HDP), embedded RSS for Secure Firmware Installation (SFI), and securable I/Os/peripherals. The device includes CORDIC and FMAC co-processors for real-time trigonometric and filter math acceleration, plus dedicated low-power timers (LPTIM1–4) and DMA controllers functional in Stop mode.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 38 general-purpose I/Os, 5V-tolerant on most pins, and independent supply capability for up to 14 I/Os down to 1.08 V.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32U575ZIT6, the STM32U535CET6 provides optimal balance of security, ultra-low-power operation, and compact LQFP48 footprint for resource-constrained endpoints; versus RA4M3G10FJBE#AC0, it delivers superior certified security architecture and 3× better ULPMark™-PP efficiency for battery longevity.

Availability

STM32U535CET6 is available at Aetrix Electronics and suitable for smart utility metering, industrial predictive maintenance sensors, secure medical wearables, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STM32U535CET6 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 STM32U5 series is ST's flagship ultra-low-power secure MCU product line, engineered specifically for battery-operated IoT endpoints demanding PSA Certified Level 3 security, sub-µA retention, and real-time edge processing without external memory or PMIC.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating of the STM32U535CET6?

The STM32U535CET6 achieves a maximum system clock of 160 MHz using its internal PLL, delivering 240 DMIPS (Dhrystone 2.1). This performance is sustained with zero wait states thanks to the 8-KB instruction cache and ART Accelerator, enabling deterministic real-time execution in power-constrained environments.

Does the STM32U535CET6 support true hardware-based TrustZone isolation for peripherals and memory?

Yes - the STM32U535CET6 implements Arm TrustZone® at silicon level with Global TrustZone Controller (GTZC), enabling hardware-enforced secure/non-secure memory regions, peripheral attribution, and I/O protection. All SRAM banks, flash sectors, and major peripherals (ADC, timers, UART, etc.) can be assigned security attributes via SAU configuration.

What low-power modes are available, and what is the lowest achievable current consumption?

The STM32U535CET6 offers seven low-power modes: Shutdown (90 nA), Standby (200 nA), Standby with RTC (370 nA), Stop 3 (1.4 µA with 16-KB SRAM), Stop 3 with full SRAM (2.2 µA), Stop 2 (3.0 µA with 16-KB SRAM), and Stop 2 with full SRAM (4.6 µA). These values are measured at 3.3 V and 25 °C per DS14217 Rev 5.

Which external memory interfaces does the STM32U535CET6 support, and what is the maximum clock rate for OCTOSPI?

The STM32U535CET6 supports OCTOSPI (Octo-SPI) for external flash/RAM expansion, with maximum clock rates up to 133 MHz in x8 mode. It also supports SDMMC for SD/eMMC cards and standard SPI/I²C for serial EEPROM/NOR flash. OCTOSPI enables execute-in-place (XIP) and memory-mapped access, eliminating software overhead for external code/data fetch.