STMicroelectronics STM32H745IIT6

Overview

STM32H745IIT6 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, integrated SMPS regulator, and 168 GPIOs. It supports real-time deterministic control in motor drives, industrial PLCs, and embedded vision systems requiring concurrent high-performance computation and low-latency peripheral handling.

For engineers reviewing the STM32H745IIT6 datasheet, STM32H745IIT6 pinout, STM32H745IIT6 application, or STM32H745IIT6 equivalent, key selection criteria include dual-core asymmetric execution capability, on-chip SMPS for power efficiency, hardware JPEG codec for image processing, and FDCAN FD support for automotive diagnostics and industrial networking.

Technical Context

The device implements three independent power domains (D1/D2/D3) enabling selective clock gating and voltage scaling across CPU clusters and peripherals. Its interconnect matrix comprises one AXI and two AHB bus matrices with five AHB2-APB bridges, supporting concurrent high-bandwidth data movement between cores, DMA controllers, and peripherals.

Dual-core operation is coordinated via shared memory, semaphores, and interrupt forwarding-Cortex-M7 handles compute-intensive tasks (e.g., FFT, motor control algorithms), while Cortex-M4 manages real-time I/O (CAN FD, USB OTG, SDMMC) and low-latency sensor fusion without OS overhead.

Key Specifications

Pinout & Package

STM32H745IIT6 uses a LQFP176 (24 × 24 mm) package with 176 pins and 25 exposed thermal pads. Pin functions are defined per alternate function mapping in ST's DS12923 Rev 3, Section 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-core Arm Cortex-M7/M4 microcontroller applications.

Compared with STM32H745IIT6, the H755IIT6 adds cryptographic engines but requires secure key provisioning, while the H743VIT6 sacrifices SMPS and pin count for smaller footprint-neither matches the original's balance of integrated power, I/O count, and performance density.

Availability

STM32H745IIT6 is available at Aetrix Electronics and suitable for industrial motor drives, automotive diagnostic gateways, medical imaging edge nodes, and smart factory HMI controllers requiring stable component supply across extended product lifecycles.

Supply support for STM32H745IIT6 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 ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, heterogeneous processing, and rich peripheral integration-including industrial automation, automotive body electronics, and AI-at-the-edge systems.

FAQ

What is the maximum operating frequency of each core in the STM32H745IIT6?

The Cortex-M7 core operates at up to 480 MHz with double-precision FPU and L1 cache (16 KB instruction + 16 KB data), delivering 1027 DMIPS. The Cortex-M4 core runs at 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 DS12923 §6.3.1.

Does the STM32H745IIT6 support external SDRAM, and what interface is used?

Yes, it supports external SDRAM up to 125 MHz in synchronous mode using the Flexible Memory Controller (FMC). The FMC provides a 32-bit data bus and supports SDRAM/LPSDR SDRAM, NOR/NAND flash, and PSRAM. Configuration requires dedicated FMC control pins (e.g., FMC_SDCLK, FMC_SDNWE) and proper timing register setup per DS12923 §3.15.

How does the integrated SMPS regulator impact PCB design compared to LDO-only MCUs?

The SMPS requires external components: a 1 µH inductor, 22 µF output capacitor, and feedback resistors. Layout must minimize loop area for the switching node and separate SMPS ground from analog/digital grounds. This reduces total system power dissipation by ~30% versus LDO-based solutions but increases layout complexity and EMI filtering requirements per DS12923 §3.5.4.

Can the STM32H745IIT6 execute code from external Quad-SPI flash, and what is the maximum interface speed?

Yes, it supports XIP (execute-in-place) from Quad-SPI flash via the QUADSPI interface, which runs up to 133 MHz in DDR mode. The interface supports octal DDR mode for higher bandwidth and includes prefetch buffer and memory-mapped mode for seamless CPU access. Boot from Quad-SPI is configurable via BOOT pins and system memory mapping per DS12923 §3.16.