STMicroelectronics STM32H745IIK6

Overview

STM32H745IIK6 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, and 168 GPIOs. It supports industrial motor control, real-time vision processing, and secure IoT edge nodes requiring deterministic dual-core coordination and high-speed analog acquisition.

For engineers reviewing the STM32H745IIK6 datasheet, STM32H745IIK6 pinout, STM32H745IIK6 application, or STM32H745IIK6 equivalent, key selection criteria include dual-core clock domain isolation, SMPS vs LDO supply configuration, TCM RAM allocation for time-critical M7 routines, and FDCAN/USB OTG HS peripheral availability in the UFBGA176+25 package.

Technical Context

The device implements three independent power domains (D1/D2/D3) enabling selective clock gating and voltage scaling across performance, communication, and system-control subsystems. Its interconnect matrix comprises one AXI and two AHB bus matrices with five AHB2-APB and two AXI2-AHB bridges, supporting concurrent high-bandwidth data movement between cores, DMA controllers, and peripherals.

Dual-core operation is coordinated via shared memory with hardware semaphores and interrupt forwarding; the M7 core handles compute-intensive tasks using its double-precision FPU and 32 KB L1 cache, while the M4 executes real-time control loops with ART Accelerator-optimized flash execution and dedicated DTCM RAM.

Key Specifications

Pinout & Package

UFBGA176+25 package with 176 signal balls plus 25 power/ground balls in 10 × 10 mm body, 0.8 mm ball pitch, and standard BGA thermal pad layout. Pin functions validated per STMicroelectronics DS12923 Rev 3 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 Arm Cortex-M7/M4 microcontroller applications.

Compared with STM32H745IIK6, the H755IIK6 adds security IP but increases BOM cost, while the H743VIT6 trades integration and efficiency for package familiarity and lower system-level power design effort.

Availability

STM32H745IIK6 is available at Aetrix Electronics and suitable for industrial motor control, edge vision systems, secure gateways, and high-fidelity audio processing requiring stable component supply and long-term manufacturability.

Supply support for STM32H745IIK6 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, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM32H7 series targets high-performance embedded applications demanding real-time determinism, heterogeneous processing, and integrated analog/mixed-signal capability-specifically for next-generation industrial automation, AI-at-the-edge, and human-machine interface systems.

FAQ

What power supply configurations does the STM32H745IIK6 support?

The STM32H745IIK6 supports three primary supply modes: SMPS-regulated VCORE (1.05–1.32 V) with external VCAP capacitors, LDO-regulated VCORE (1.1–1.32 V), or hybrid mode where SMPS powers VCORE and LDO supplies analog/peripherals. Selection depends on efficiency targets and noise sensitivity-SMPS achieves >85% efficiency above 50 mA load, while LDO provides cleaner analog rails.

How is dual-core communication implemented between the M7 and M4 cores?

Dual-core communication uses shared SRAM with hardware semaphores (HSEM peripheral) for resource locking and interrupt forwarding via the IPCC (Inter-Processor Communication Controller). The M7 can trigger M4 interrupts through IPCC mailbox registers, and both cores access common memory regions with cache coherency maintained via SCB_CleanInvalidateDCache_by_Addr() calls. No external bus arbitration is required.

Which peripherals are accessible in low-power Stop mode?

In Stop mode, the STM32H745IIK6 retains operation of RTC, LSE oscillator, backup SRAM, and select wakeup-capable peripherals including I2C FM+, LPUART, and certain GPIOs configured for EXTI. The M7 and M4 cores, flash, main PLL, and most APB/AHB peripherals are clock-gated. Wakeup occurs within 5 µs from EXTI or RTC alarm events, preserving real-time responsiveness.

Does the STM32H745IIK6 support external SDRAM, and what controller is used?

Yes-the STM32H745IIK6 integrates a Flexible Memory Controller (FMC) supporting SDRAM (including LPDDR/DDR2), NOR/NAND flash, and PSRAM. It implements a 32-bit data bus with programmable timing registers and supports up to 256 MB address space. SDRAM initialization requires precise sequence control via FMC registers and calibration of read/write delays using the Delay Block (DLYB) peripheral per Section 6.3.20.