STMicroelectronics STM32U585ZIT3QTR

Overview

STM32U585ZIT3QTR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 32-bit MCU with TrustZone® and FPU, delivering 240 DMIPS at up to 160 MHz. It integrates 2 MB Flash with ECC, 786 KB SRAM (722 KB with ECC ON), and hardware crypto accelerators including dual AES coprocessors and PSA Level 3/SESIP3 certification. It targets secure, battery-constrained IoT edge nodes requiring RTC operation in VBAT mode, autonomous low-power peripheral operation in Stop 2, and on-the-fly Octo-SPI decryption.

For engineers reviewing the STM32U585ZIT3QTR datasheet, STM32U585ZIT3QTR pinout, STM32U585ZIT3QTR application, or STM32U585ZIT3QTR equivalent, key selection criteria include verified 160 nA Shutdown current, 530 nA Standby-with-RTC power, TrustZone-enforced memory isolation, dual 14-/12-bit ADCs with Stop 2 autonomy, and UCPD-based USB Type-C Power Delivery controller integration.

Technical Context

The device implements a dual-bank Flash architecture enabling read-while-write operations and supports voltage scaling with embedded SMPS and LDO regulators for dynamic power optimization. Its TrustZone security model enforces strict separation between secure and non-secure worlds via GTZC, with securable I/Os, memories, and peripherals including dedicated secure boot entry and HDP protection.

Low-power operation is architecturally enforced through LPBAM (Low-Power Background Autonomous Mode), allowing DMA-driven peripheral chains-including ADC, timers, and communication interfaces-to execute without CPU intervention down to Stop 2 mode. The 32-bit Cortex-M33 core includes MPU, DSP extensions, and FPU, with ART Accelerator providing zero-wait-state execution from Flash at 160 MHz.

Key Specifications

Pinout & Package

STM32U585ZIT3QTR is housed in a 144-pin LQFP144 (20 × 20 mm) package with exposed thermal pad, supporting industrial temperature range (–40 °C to +125 °C) and ECOPACK2 compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L562ZEJ6, the STM32U585ZIT3QTR adds USB-C PD control, OTFDEC, and 4× Flash capacity - essential for secure firmware distribution and external memory expansion. Versus RA4M3GDB0, it delivers certified PSA Level 3 security and superior low-power autonomy, at the expense of slightly lower analog peripheral count.

Availability

STM32U585ZIT3QTR is available at Aetrix Electronics and suitable for smart utility meters, industrial predictive maintenance nodes, secure wearables, and USB-C powered peripherals requiring stable component supply across long-lifecycle deployments.

Supply support for STM32U585ZIT3QTR 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, specializing in microcontrollers, power management, sensors, and automotive ICs with strong focus on energy efficiency and security.

The STM32U5 series is ST's flagship ultra-low-power secure MCU product line, designed specifically for battery-operated IoT endpoints requiring PSA-certified security, multi-year runtime, and rich analog/mixed-signal integration.

FAQ

What is the maximum operating temperature rating for STM32U585ZIT3QTR?

The STM32U585ZIT3QTR is rated for industrial operation from –40 °C to +125 °C ambient temperature, validated per ST's DS13086 Rev 10 specification. This extended range supports deployment in harsh environments such as smart grid infrastructure, automotive under-hood modules, and industrial motor drives where thermal margins exceed standard commercial-grade MCUs.

Does STM32U585ZIT3QTR support true hardware random number generation?

Yes - it integrates a NIST SP800-90B compliant True Random Number Generator (RNG) with entropy source based on analog noise and digital jitter. Output is accessible via TRNG peripheral and used internally by SAES/PKA for key derivation. No software seeding or post-processing is required for cryptographic key generation.

Can the STM32U585ZIT3QTR execute code directly from external Octo-SPI memory?

Yes - with On-the-Fly Decryption (OTFDEC) enabled, the device executes decrypted instructions directly from external Octo-SPI NOR/PSRAM while maintaining TrustZone isolation. The OTFDEC block uses AES-128/256 keys stored in secure memory, and decryption occurs transparently in the AXI bus path without CPU involvement or SRAM buffering.

How many independent power domains does STM32U585ZIT3QTR support?

The device supports three independent power domains: VDD/VSS (digital core), VDDA/VSSA (analog), and VDDIO2/VSSIO2 (I/O bank). Each domain has dedicated regulators and can be supplied at different voltages (1.08–3.6 V), enabling mixed-voltage interfacing, analog noise isolation, and selective power gating of unused I/O banks to reduce leakage current.