STMicroelectronics STM32H755ZIT6U

Overview

STM32H755ZIT6U from STMicroelectronics is a dual-core Arm® Cortex®-M7 (480 MHz) and Cortex®-M4 (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 industrial control, motor drives, and embedded vision systems requiring deterministic real-time response and secure firmware updates.

For engineers reviewing the STM32H755ZIT6U datasheet, STM32H755ZIT6U pinout, STM32H755ZIT6U application, or STM32H755ZIT6U equivalent, key selection criteria include dual-core asymmetric processing capability, on-chip SMPS support for power efficiency, 16-bit ADCs (3.6 MSPS), JPEG codec, LCD-TFT controller, and FDCAN FD interface compliance - all in a UFBGA176+25 (10×10 mm) package.

Technical Context

The device implements a three-domain power architecture (D1/D2/D3) enabling independent clock gating and voltage scaling across 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, event forwarding, and interrupt routing through the NVIC and EXTI. The M7 core features L1 instruction/data caches (16 KB each) and double-precision FPU; the M4 core uses ART Accelerator for zero-wait-state execution from flash at up to 240 MHz.

Key Specifications

Pinout & Package

STM32H755ZIT6U is housed in a UFBGA176+25 package (10 × 10 mm, 0.8 mm pitch) with 176 signal balls plus 25 dedicated power/ground balls. Pin functions are validated per ST's DS12919 Rev 3 datasheet Section 5 (Pinout, pin description and alternate functions) and Table 8 (STM32H755xI pin/ball definition).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H745ZIT6, the STM32H755ZIT6U integrates SMPS for higher efficiency and smaller footprint; compared with STM32H753ZIT6, it adds FDCAN FD and JPEG for automotive diagnostics and vision edge processing - making it optimal for next-generation IIoT nodes requiring both connectivity and media capability.

Availability

STM32H755ZIT6U is available at Aetrix Electronics and suitable for industrial motor control, embedded vision systems, secure edge gateways, and HMI with TFT display requiring stable component supply across multi-year production cycles.

Supply support for STM32H755ZIT6U 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 components for industrial, automotive, and consumer markets.

The STM32H7 series targets high-end embedded applications demanding real-time determinism, security, and rich peripheral integration - specifically engineered for industrial automation, motor control, and AI-edge devices operating under extended temperature and reliability constraints.

FAQ

What is the maximum operating frequency of each core in the STM32H755ZIT6U?

The Arm® Cortex®-M7 core runs 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 operates at up to 240 MHz with single-precision FPU and ART Accelerator, achieving 300 DMIPS. Both cores support independent clock sources and dynamic frequency scaling via the RCC.

Does the STM32H755ZIT6U support external SDRAM, and what interface is used?

Yes, the STM32H755ZIT6U supports external SDRAM (including LPDDR/SDR) via its Flexible Memory Controller (FMC), which provides a 32-bit data bus and synchronous clocking up to 125 MHz. The FMC also supports NOR/NAND flash, PSRAM, and SRAM, with dedicated address/control lines mapped to specific GPIO banks per datasheet Table 8.

How does the integrated SMPS regulator function, and what external components are required?

The SMPS is an integrated step-down DC-DC converter supplying VCORE directly. It requires two external 2.2 µF ceramic capacitors on VCAP_1 and VCAP_2 pins, plus an external inductor (1.5 µH typical) and feedback resistors. Configuration is done via registers; output voltage is programmable from 0.63 V to 1.4 V in 25 mV steps to match core voltage scaling modes.

Can the STM32H755ZIT6U execute code from external Quad-SPI flash, and what is the maximum interface speed?

Yes, the QUADSPI interface supports XIP (execute-in-place) from external flash at up to 133 MHz (66.5 MHz clock with DDR mode). It supports octal and quad SPI protocols, memory-mapped mode with prefetch buffer, and automatic polling for status register. Code execution is seamless with ART Accelerator enabled, eliminating wait states even at full speed.