STMicroelectronics STM32H755IIK6

Overview

STM32H755IIK6 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 crypto acceleration (AES-256, SHA-2, RNG), and 46 communication/analog peripherals. It targets high-performance industrial control, motor drives, and embedded vision systems requiring deterministic real-time response and secure firmware updates.

For engineers reviewing the STM32H755IIK6 datasheet, STM32H755IIK6 pinout, STM32H755IIK6 application, or STM32H755IIK6 equivalent, key selection criteria include dual-core asymmetric processing capability, on-chip SMPS support for power efficiency, 16-bit ADCs (3.6 MSPS), dual CAN FD interfaces, and TFBGA240+25 package compatibility with high I/O density and thermal performance in compact industrial modules.

Technical Context

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

Dual-core operation is coordinated via shared memory, semaphores, and interrupt forwarding - the M7 core handles compute-intensive tasks (e.g., motor control algorithms, JPEG decoding) while the M4 manages real-time I/O (CAN FD, USB OTG, SDMMC) and low-latency sensor acquisition using its ART Accelerator and tightly coupled memory.

Key Specifications

Pinout & Package

STM32H755IIK6 is housed in a TFBGA240+25 package (14 × 14 mm, 0.8 mm ball pitch) with 240 signal balls plus 25 dedicated power/ground balls. This package enables high I/O count (up to 168 GPIOs), thermal efficiency for sustained 480 MHz operation, and compatibility with standard PCB assembly processes.

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 STM32H755IIK6 adds JPEG codec and 1 MB extra flash for firmware resilience; versus i.MX RT1176DVMAA, it trades peak M7 speed for integrated SMPS, dual CAN FD, and stronger cryptographic coverage - making it optimal for space-constrained, power-sensitive industrial edge nodes.

Availability

STM32H755IIK6 is available at Aetrix Electronics and suitable for industrial PLCs, motor drives, embedded vision gateways, and secure edge nodes requiring stable component supply across long-lifecycle production programs.

Supply support for STM32H755IIK6 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 vertical manufacturing capabilities.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, security, and graphics - designed specifically for industrial automation, motor control, and AI-at-the-edge systems requiring dual-core heterogeneity and hardware acceleration.

FAQ

What is the maximum operating frequency of each core in the STM32H755IIK6?

The Arm Cortex-M7 core operates at up to 480 MHz (1027 DMIPS), while the Cortex-M4 core runs at up to 240 MHz (300 DMIPS). Both achieve these frequencies with L1 cache enabled and ART Accelerator active for zero-wait-state flash execution. Voltage scaling must be configured to Range 0 (VCORE = 1.30 V) to sustain 480 MHz operation.

Does the STM32H755IIK6 support external SDRAM, and what interface is used?

Yes, it supports external SDRAM up to 125 MHz in synchronous mode via the Flexible Memory Controller (FMC), which provides a 32-bit data bus and supports SDRAM/LPSDR SDRAM, PSRAM, NOR/NAND flash, and SRAM. The FMC is accessible only from the D1 domain and requires proper timing configuration in RCC and FMC registers.

How does the integrated SMPS regulator reduce system power consumption?

The SMPS step-down converter directly supplies VCORE with higher efficiency than an LDO - typical efficiency exceeds 85% at 200 mA load, reducing heat dissipation and extending battery life in portable industrial devices. It supports dynamic voltage scaling across six ranges and can also power external circuitry via dedicated VDDIO2 outputs.

Can the STM32H755IIK6 execute secure boot and firmware updates without external components?

Yes - it includes ROM-based secure boot with public-key verification (RSA-2048), hardware AES-256 decryption, SHA-256 hashing, and secure firmware upgrade (SFU) support. All cryptographic operations occur in dedicated accelerators; no external security IC or EEPROM is required to implement a complete trusted boot chain.