STMicroelectronics STM32H755IIT6

Overview

STM32H755IIT6 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 (192 KB TCM + 864 KB SRAM), integrated SMPS regulator, hardware JPEG codec, and cryptographic acceleration (AES-256, SHA-2, RNG). It targets high-performance industrial HMI, motor control, and edge AI inference at the device level.

For engineers reviewing the STM32H755IIT6 datasheet, STM32H755IIT6 pinout, STM32H755IIT6 application, or STM32H755IIT6 equivalent, key selection criteria include dual-core real-time partitioning, on-chip SMPS for power efficiency, 16-bit ADCs (3.6 MSPS), LCD-TFT controller with DMA2D, and FDCAN FD support for deterministic automotive/industrial networking.

Technical Context

The STM32H755IIT6 implements a heterogeneous dual-core architecture: the M7 core handles compute-intensive tasks with double-precision FPU, 32 KB L1 cache, and 1027 DMIPS; the M4 core manages real-time I/O and communication with ART Accelerator for zero-wait-state flash execution. Both cores operate in independent power domains (D1/D2/D3) with fine-grained clock gating.

Its interconnect matrix includes one AXI and two AHB bus matrices, five AHB2-APB bridges, and four DMA controllers-including a high-speed MDMA with linked-list support-enabling concurrent peripheral data movement without CPU intervention. Clock management uses three PLLs (fractional mode) fed by internal (64 MHz HSI, 48 MHz HSI48) and external (4–48 MHz HSE) oscillators.

Key Specifications

Pinout & Package

STM32H755IIT6 is housed in a TFBGA240+25 package (14 × 14 mm, 0.8 mm pitch), compliant with ECOPACK2 environmental standards. Pin functions are validated per ST's DS12919 Rev 3 datasheet Section 5 (Pinout, pin description and alternate functions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H755IIT6, the H743VIT6 trades flash size and power integration for lower unit cost and simpler thermal design, while the i.MX RT1176 demands more external components but delivers higher single-threaded M7 performance-making the H755 optimal for balanced mixed-signal, graphics, and security workloads in constrained PCB space.

Availability

STM32H755IIT6 is available at Aetrix Electronics and suitable for industrial HMI, motor control gateways, edge vision nodes, and secure IoT edge controllers requiring stable component supply across extended product lifecycles.

Supply support for STM32H755IIT6 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.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, rich connectivity, and hardware-accelerated graphics/security-designed specifically for industrial automation, medical devices, and intelligent edge systems.

FAQ

What is the maximum operating frequency of each core in the STM32H755IIT6?

The Cortex-M7 core operates up to 480 MHz with double-precision FPU and 32 KB L1 cache, delivering 1027 DMIPS; the Cortex-M4 core runs up to 240 MHz with single-precision FPU and ART Accelerator, achieving 300 DMIPS. Both frequencies are achievable simultaneously under specified voltage and temperature conditions per DS12919 Rev 3 Section 6.3.14.

Does the STM32H755IIT6 support external SDRAM, and what is the maximum clock rate?

Yes, it supports external SDRAM via the Flexible Memory Controller (FMC) with synchronous operation up to 125 MHz. The FMC also interfaces with PSRAM, NOR/NAND flash, and SRAM. Timing parameters and setup are defined in DS12919 Rev 3 Section 6.3.18, and layout guidelines require controlled impedance traces and proper termination.

How does the integrated SMPS regulator reduce system-level power consumption?

The SMPS replaces an external DC-DC converter, achieving >85% efficiency at loads from 10 mA to 1 A. It directly supplies VCORE and can power external circuitry, reducing heat dissipation and enabling dynamic voltage scaling across six configurable ranges-critical for extending battery life in Standby mode (2.95 µA with RTC active).

Can the STM32H755IIT6 execute code directly from external Quad-SPI flash?

Yes, the Dual Mode Quad-SPI interface supports XIP (execute-in-place) from external Octo-SPI memories at up to 133 MHz. This eliminates the need to copy firmware to internal flash, reducing boot time and enabling seamless over-the-air updates without halting real-time operations on the M4 core.