STMicroelectronics STM32H7A3IIK6Q

Overview

STM32H7A3IIK6Q from STMicroelectronics is a 32-bit Arm® Cortex®-M7 microcontroller operating at up to 280 MHz with double-precision FPU, 16 KB instruction and 16 KB data cache, 2 MB flash, and ~1.4 MB RAM (including 64 KB ITCM + 128 KB DTCM). It integrates dual Octo-SPI interfaces, FMC, 2x ADCs (16-bit, 3.6 MSPS), 2x DACs, 2x op-amps, and SMPS regulator - deployed in industrial motor control and medical imaging systems.

For engineers reviewing the STM32H7A3IIK6Q datasheet, STM32H7A3IIK6Q pinout, STM32H7A3IIK6Q application, or STM32H7A3IIK6Q equivalent, key selection criteria include verified 280 MHz real-time execution, dual-bank flash with read-while-write, TCM RAM allocation for deterministic ISR latency, Octo-SPI DTR mode support up to 110 MHz, and SMPS integration for sub-1V core supply efficiency.

Technical Context

The device implements a six-stage dual-issue Cortex-M7 core with dynamic branch prediction and Harvard architecture, enabling deterministic interrupt response under 280 MHz operation. Its memory subsystem includes AXI/AHB bus matrices, three independent power domains (CPU, SRD, Backup), and hardware-accelerated peripherals including JPEG codec, Chrom-ART DMA2D, and GFXMMU.

Peripherals are distributed across four APB buses and three AHB domains, with dedicated bridges (AXI2AHB, AHB2APB) ensuring low-latency access to time-critical resources like timers, ADCs, and DFSDM filters. The SMPS regulator directly supplies VCORE, supporting voltage scaling in Run/Stop modes while maintaining 32 µA Stop current with full RAM retention.

Key Specifications

Pinout & Package

STM32H7A3IIK6Q is housed in a UFBGA176+25 package (10 × 10 mm, 0.65 mm pitch), featuring 176 signal balls plus 25 dedicated ground balls for EMI suppression and thermal dissipation. The package supports 168 GPIOs with interrupt capability, 164 of which are 5-V-tolerant, and includes dedicated pins for SMPS feedback (VFBSMPS), VCAP decoupling, and tamper detection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32H7B3IIK6Q, the STM32H7A3IIK6Q offers identical real-time performance but trades flash/SRAM capacity for lower unit cost and smaller die size; versus STM32H743VIT6, it delivers superior power efficiency and memory interface flexibility at the expense of pin count and package compatibility.

Availability

STM32H7A3IIK6Q is available at Aetrix Electronics and suitable for industrial motor control, portable medical imaging, smart building HVAC, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for STM32H7A3IIK6Q 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 over 45 years of industrial reliability.

The STM32H7A3 series belongs to ST's high-performance Cortex-M7 MCU family, designed specifically for resource-constrained edge devices demanding real-time determinism, analog integration, and ultra-low-power operation in harsh environments.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32H7A3IIK6Q achieves 280 MHz via its Arm Cortex-M7 core with six-stage dual-issue pipeline and dynamic branch prediction. This frequency is sustained using the internal 64 MHz HSI oscillator multiplied by PLL1 with fractional mode, while L1 caches (16 KB I-cache + 16 KB D-cache) eliminate wait states during flash execution. Voltage scaling must be set to Range 0 (VOS0) and VDD ≥ 2.7 V for guaranteed operation.

Does this MCU support hardware encryption for secure boot?

No, the STM32H7A3IIK6Q does not integrate AES, PKA, or TRNG-based secure boot acceleration. It supports ROP (Read-Out Protection) and PC-ROP (PC Read-Out Protection) for flash memory lockdown, active tamper detection on three pins, and secure firmware upgrade via bootloader validation - but cryptographic operations require software implementation or external secure element integration.

Can the two Octo-SPI interfaces operate simultaneously?

Yes, both OCTOSPI1 and OCTOSPI2 can operate concurrently, but only in muxed mode per ST's DS13195 Rev 8 specification. Each interface supports independent clock domains and DTR/SDR protocols up to 110/140 MHz respectively. Simultaneous use requires careful routing to avoid crosstalk, especially on shared DQS lines, and software coordination of memory arbitration via the OCTOSPI peripheral registers.

What is the role of the SMPS regulator and how is it configured?

The integrated SMPS step-down converter replaces an external DC-DC to supply VCORE directly, improving efficiency (>90% at 200 mA) and reducing thermal load. Configuration requires connecting VFBSMPS to a resistor divider (e.g., 100 kΩ + 200 kΩ) to set output voltage, enabling VDDSMPS/VSSSMPS pins, and initializing the SMPS control register (SYSCFG_SMPSEN) in firmware. Output voltage range is 0.6–1.4 V with ±2% tolerance.