High-performance edge AI with NPU-accelerated 32-bit microcontrollers

September 30, 2026

Integrating new machine-learning capabilities, the STM32N6x7xx microcontroller series from STMicroelectronics makes it possible to perform computer vision, audio processing, sound analysis, and more in consumer and industrial applications at the edge.

The STM32N6x7xx series consists of 32-bit STM32 microcontrollers integrating accelerated machine-learning (ML) capabilities alongside a high-performance 800MHz Arm® Cortex®-M55 CPU core. 

These MCUs are the first to embed the Neural-ART Accelerator, a neural processing unit (NPU). With the onboard NPU, the STM32N6x7xx series provides significantly greater machine-learning performance than current high-end STM32 MCUs. This enables cost-sensitive and power-conscious consumer and industrial products to implement AI video and audio functions in small embedded systems.

The NPU includes dedicated streaming engines that optimize data flow and minimize internal buffer usage and power. The accelerator supports on-the-fly weight decompression and real-time data encryption and decryption.

The high STM32N6x7xx ML performance is complemented by the system control side of the MCU. The Cortex-M55 core achieves a high CoreMark® score of 3,616. The MCU also includes 4.2Mbytes of RAM, providing sufficient memory to support data-intensive AI and multimedia workloads.

To support AI vision applications, the STM32N6x7xx incorporates an image signal processor (ISP) which provides direct signal processing, enabling the use of simple and affordable image sensors. The microcontroller is also supported by Edge AI Suite, a comprehensive set of software tools for the development of edge machine-learning applications. These enable developers to implement AI models in various formats such as TensorFlow Lite, Keras, and ONNX.

Features

  • Security features:
    • TrustZone®-aware support 
    • Memory protection unit 
    • Secure boot ROM 
  • Neo-Chrom graphic accelerator 
  • Optional hardware H.264 codec
  • Hardware JPEG accelerator
  • Operating-temperature range: -40°C to 125°C

Applications

  • Industrial equipment
  • Smart home equipment 
  • Smart cities
  • Automotive systems
  • Personal electronics devices
  • Medical and healthcare equipment
FTM-9-26_EXT_STMicro_STM32N657B0H3Q

Evaluation board for 32-bit MCUs with onboard AI acceleration

Part Number: NUCLEO-N657X0-Q

The NUCLEO-N657X0-Q evaluation board from STMicroelectronics provides a convenient platform for proof-of-concept and prototype development using the STM32N6 series of microcontrollers, the first STM32 to include the Neural-ART Accelerator, a neural processing unit (NPU).

 

The STM32 Nucleo-144 board includes an ST Zio connector, which extends ARDUINO® Uno V3 connectivity. ST morpho headers provide an easy means of expanding the functionality of the Nucleo open development platform with a wide choice of specialized shields.

 

The NUCLEO-N657X0-Q does not require a discrete probe as it integrates an ST-LINK debugger/programmer. The board is backed by free STM32 software libraries and examples available with the STM32Cube MCU package.

 

Key features include:

  • Three user LEDs
  • User push-button and reset push-button
  • 32.768kHz crystal oscillator
  • Board connectors:
    • SWD
    • ST morpho expansion connector
  • Flexible power-supply options
  • Support for integrated development environments including IAR Embedded Workbench®, MDK-ARM, and STM32CubeIDE

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