STMicroelectronics STM32U545CET6

Overview

STM32U545CET6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M33 microcontroller with TrustZone® security, 512 KB flash, 274 KB SRAM, and hardware crypto accelerators (AES, PKA, HASH, RNG). It delivers 240 DMIPS at up to 160 MHz, supports LPBAM autonomous peripheral operation down to Stop 2 mode, and operates from 1.71 V to 3.6 V across –40 °C to +125 °C - enabling use in battery-powered industrial sensors and secure edge nodes.

For engineers reviewing the STM32U545CET6 datasheet, STM32U545CET6 pinout, STM32U545CET6 application, or STM32U545CET6 equivalent, key selection criteria include TrustZone-enabled secure boot, sub-µA low-power modes (90 nA Shutdown), Octo-SPI interface for encrypted external memory, dual 14-/12-bit ADCs with Stop 2 autonomy, and CAN FD + USB FS connectivity for mixed-signal IoT endpoints.

Technical Context

The STM32U545CET6 integrates an Arm Cortex-M33 core with MPU, FPU, and TrustZone isolation, paired with ART Accelerator (8 KB I-cache, 4 KB D-cache) enabling zero-wait-state execution at 160 MHz. Its FlexPowerControl architecture implements seven low-power modes - including 90 nA Shutdown and 370 nA Standby with RTC - managed via embedded LDO and SMPS with dynamic voltage scaling.

Security is implemented at silicon level: SESIP3/PSA Level 3 certified, with securable I/Os, memories, and peripherals; Root of Trust via unique boot entry and HDP; Secure Firmware Installation (SFI); and on-the-fly Octo-SPI decryption. Analog subsystem includes two independent ADCs (14-bit @ 2.5 Msps, 12-bit @ 2.5 Msps autonomous in Stop 2), dual DACs, OPAMP with PGA, and ultra-low-power comparator.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 42 user I/Os, 3 dedicated power/ground pins, and 5 dedicated supply domains (VDD, VDDA, VSSA, VREF+, VBAT). Pin functions validated per DS14216 Rev 5 Section 4.2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32U545CET6, the STM32U575ZIT6 offers expanded memory and connectivity for gateway roles, while the LPC55S69JBD100 trades certification depth and ultra-low-power autonomy for cost reduction - making the U545CET6 optimal for compact, certified, battery-constrained edge nodes.

Availability

STM32U545CET6 is available at Aetrix Electronics and suitable for smart utility meters, secure industrial sensor nodes, medical wearables, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for STM32U545CET6 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, MEMS, and analog components for industrial, automotive, and consumer markets.

The STM32U5 series targets ultra-low-power, security-critical edge applications - combining Arm TrustZone, PSA-certified firmware, and sub-µA power states to enable decade-long battery operation in certified IoT endpoints.

FAQ

What is the maximum operating temperature rating for STM32U545CET6?

The STM32U545CET6 is qualified for operation from –40 °C to +125 °C ambient temperature, meeting industrial and extended-temperature automotive requirements. This rating applies to all LQFP48 variants and is verified per JEDEC JESD22-A108 and ST's internal qualification standards.

Does STM32U545CET6 support USB device mode with CDC ACM class?

Yes, the integrated USB Full-Speed controller supports device mode with CDC ACM (Abstract Control Model) class out-of-the-box using ST's official USB Device Library (UM2389). The peripheral operates independently in Run and Stop modes, enabling reliable host-computer communication for configuration and telemetry.

How many wake-up pins are available in Shutdown mode?

The STM32U545CET6 provides 23 dedicated wake-up pins in Shutdown mode - all GPIOs except those in the VDDIO2 domain (PB12–PB15, PC12–PC15, PD12–PD15, PE12–PE15) and NRST. Each supports configurable edge sensitivity and can trigger exit from 90 nA Shutdown within 5 µs.

Is the 14-bit ADC capable of oversampling in Stop 2 mode?

No - only the 12-bit ADC4 supports autonomous operation and hardware oversampling in Stop 2 mode. The 14-bit ADC1 requires CPU presence and higher clock domains, limiting its use to Run, Sleep, or Stop 0/1 modes. This distinction is documented in Section 3.25.2 of DS14216 Rev 5.