STMicroelectronics STM32H745XIH6U

Overview

STM32H745XIH6U from STMicroelectronics is a dual-core 32-bit Arm® Cortex®-M7 (up to 480 MHz) and Cortex®-M4 (up to 240 MHz) microcontroller with double-precision FPU, 2 MB flash, 1 MB RAM (including 192 KB TCM), and integrated SMPS regulator. It supports up to 168 GPIOs, 4× CAN FD interfaces, Ethernet MAC, LCD-TFT controller, and hardware JPEG codec - deployed in industrial HMI, motor control gateways, and edge AI inference nodes.

For engineers reviewing the STM32H745XIH6U datasheet, STM32H745XIH6U pinout, STM32H745XIH6U application, or STM32H745XIH6U equivalent, key selection criteria include dual-core real-time partitioning, SMPS power efficiency, Quad-SPI memory interface timing (133 MHz), and verified CAN FD + Ethernet coexistence in safety-critical automation systems.

Technical Context

The device implements three independent power domains (D1/D2/D3) enabling selective clock gating and domain shutdown - D1 hosts the M7 core and high-speed peripherals, D2 manages communication interfaces (CAN, USB, Ethernet), and D3 handles reset/clock/power control. Each domain features configurable voltage scaling across six ranges for dynamic power optimization.

Its interconnect architecture includes one AXI and two AHB bus matrices, five AHB2-APB bridges, and two AXI2-AHB bridges, supporting concurrent high-bandwidth data flows between the M7 core, MDMA controller, FMC, and QUADSPI - critical for deterministic real-time processing of camera input (DCMI, up to 80 MHz) and display output (LTDC, XGA).

Key Specifications

Pinout & Package

STM32H745XIH6U uses a TFBGA240+25 package (14 × 14 mm, 0.8 mm ball pitch) with 240 signal balls and 25 dedicated ground/thermal balls. Pin assignment follows ST's standardized ball map for H745xI series, supporting full peripheral remapping via alternate functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H753IIK6, the STM32H745XIH6U delivers 32% lower active power via integrated SMPS and supports 2× more CAN FD channels for distributed control networks; versus i.MX RT1176DVMAA, it offers superior low-power fidelity (2.95 µA Standby) and deterministic real-time latency, but trades off multimedia throughput.

Availability

STM32H745XIH6U is available at Aetrix Electronics and suitable for industrial motor control gateways, edge AI vision nodes, and human-machine interfaces requiring stable component supply, long-term lifecycle support, and ECOPACK2 environmental compliance.

Supply support for STM32H745XIH6U 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, specializing in microcontrollers, power management, sensors, and automotive ICs - with over 40 years of embedded systems innovation.

The STM32H7 series targets high-performance real-time applications demanding dual-core determinism, hardware-accelerated graphics, and ultra-low-power operation across industrial automation, medical devices, and smart infrastructure.

FAQ

What is the maximum operating frequency of each core in the STM32H745XIH6U?

The Arm Cortex-M7 core operates up to 480 MHz (1027 DMIPS), while the Cortex-M4 core runs up to 240 MHz (300 DMIPS). Both frequencies are achievable simultaneously under specified voltage and temperature conditions (1.26 V core supply, −40°C to +85°C), with SMPS regulator enabled and voltage scaling set to Range 0.

Does the STM32H745XIH6U support external SDRAM, and what interface is used?

Yes, it supports external SDRAM (including LPDDR/SDR SDRAM) via the 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 and PSRAM, with dedicated control signals for address multiplexing and bank management.

How many CAN FD interfaces does the STM32H745XIH6U provide, and are they fully independent?

The device integrates four CAN FD controllers (FDCAN1–FDCAN4), all independently clocked and configurable. Each supports ISO 11898-1:2015 compliant FD frames (up to 8 Mbps arbitration, 20 Mbps data phase), loopback/self-test modes, and time-triggered communication - with no shared resources affecting concurrent operation.

What is the role of the VCAP pins, and what capacitor value is required?

VCAP_1 and VCAP_2 stabilize the internal SMPS and LDO regulators' output. Two 2.2 µF X7R ceramic capacitors (±10%, 6.3 V rating) must be placed as close as possible to each VCAP pin, with low-ESR layout (<10 mΩ) to ensure stable core voltage during dynamic load transients and prevent brownout resets.