STMicroelectronics STM32H755IIT3

Overview

STM32H755IIT3 from STMicroelectronics is a dual-core 32-bit Arm® Cortex®-M7 (up to 480 MHz) and Cortex®-M4 (up to 240 MHz) microcontroller with 2 MB flash, 1 MB RAM (including 192 KB TCM), integrated SMPS regulator, hardware crypto acceleration (AES-256, SHA-2, RNG), and 46 communication/analog peripherals. It targets high-performance embedded applications requiring real-time determinism, secure firmware updates, and rich connectivity - such as industrial PLCs, motor drives, and edge AI inference nodes.

For engineers reviewing the STM32H755IIT3 datasheet, STM32H755IIT3 pinout, STM32H755IIT3 application, or STM32H755IIT3 equivalent, key selection considerations include dual-core asymmetric execution capability, voltage scaling across six power ranges, dual-domain power management (D1/D2/D3), and support for external SDRAM/NOR/NAND via flexible memory controller.

Technical Context

The device implements a hierarchical interconnect architecture with three bus matrices (1 AXI + 2 AHB) and five AHB2-APB bridges, enabling concurrent high-bandwidth data movement between CPU cores, DMA controllers (MDMA, dual-port DMAs), and peripherals. Its clock system integrates three PLLs - one for system clock generation and two kernel-clock PLLs - all supporting fractional mode for precise frequency synthesis across domains.

Power architecture separates functionality into three independent domains: D1 (high-performance core cluster), D2 (communication/timer peripherals), and D3 (reset/clock/power control). Each domain supports independent clock gating and voltage scaling, with SMPS and LDO regulators supplying VCORE and I/O domains respectively - enabling sub-3 µA standby current while maintaining RTC and backup SRAM operation.

Key Specifications

Pinout & Package

STM32H755IIT3 uses a 240-ball TFBGA package with 25 additional balls for VSS/VDD decoupling and thermal pads. The package supports fine-pitch PCB layout and high-density routing for complex mixed-signal designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-core high-performance microcontroller applications.

Compared with STM32H743VIT6, the STM32H755IIT3 adds SMPS, 1 MB extra flash, and enhanced analog subsystem; versus i.MX RT1176DVMAA, it trades raw M7 clock speed for tighter integration, lower power, and richer analog/mixed-signal capability - making it optimal for self-contained, battery-aware edge nodes.

Availability

STM32H755IIT3 is available at Aetrix Electronics and suitable for industrial motor control, edge AI vision nodes, secure gateways, and high-resolution HMI applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for STM32H755IIT3 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, specializing in microcontrollers, power management, sensors, and automotive ICs - with over 40 years of innovation in embedded systems.

The STM32H7 series targets high-end real-time applications demanding dual-core determinism, advanced security, and heterogeneous peripheral integration - designed specifically for industrial automation, medical devices, and intelligent edge equipment.

FAQ

What is the maximum operating frequency of each core in the STM32H755IIT3?

The Arm Cortex-M7 core operates up to 480 MHz (1027 DMIPS), while the Cortex-M4 core runs up to 240 MHz (300 DMIPS). Both cores feature independent clock trees, MPUs, and FPUs. Frequency scaling is managed through the RCC and voltage scaling registers, with six configurable voltage ranges ensuring stability across performance modes.

Does the STM32H755IIT3 support external SDRAM, and what interface is used?

Yes, it supports external SDRAM up to 125 MHz via the Flexible Memory Controller (FMC), which provides a 32-bit data bus and dedicated control signals (RAS/CAS/WE/CLK). The FMC also supports PSRAM, NOR/NAND flash, and SRAM, enabling scalable memory architectures for HMI frame buffers or firmware update staging areas.

How does the integrated SMPS regulator differ from the LDO in power management?

The SMPS is a high-efficiency step-down DC-DC converter directly powering VCORE, achieving >85% efficiency at medium-to-high loads; the LDO supplies I/O and analog domains with low-noise, fixed 3.3 V output. SMPS operation requires external inductor (1.5 µH) and compensation components, while LDO needs only decoupling capacitors - offering design flexibility for trade-offs between efficiency and EMI sensitivity.

Can the STM32H755IIT3 execute code from external Quad-SPI flash, and what boot mechanisms are supported?

Yes, it supports XIP (execute-in-place) from Quad-SPI flash via the QUADSPI interface running up to 133 MHz. Boot options include system memory (ROM bootloader), internal flash, or external memory mapped via FMC or QUADSPI - selected by BOOT0/BOOT1 pins at reset. The ART Accelerator caches external instructions to eliminate wait states during XIP execution.