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STM32N657X0H3Q

STM32N657X0H3Q

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Product Overview

The STM32N657X0H3Q is a high-performance 32-bit microcontroller from STMicroelectronics' advanced STM32N6 series. Based on an Arm Cortex-M55 core operating at up to 800 MHz, the device combines high-performance MCU processing with an integrated ST Neural-ART Accelerator, advanced graphics, multimedia, computer vision, connectivity, and hardware security features.

The STM32N657X0H3Q integrates 4.2 MB of contiguous SRAM, together with ECC-protected tightly coupled memory, an external memory controller, and XSPI interfaces for high-speed external memory. The integrated ST Neural-ART Accelerator operates at up to 1 GHz and provides up to 600 GOPS of neural-network processing performance.

The device also integrates a NeoChrom 2.5D GPU, JPEG codec, H.264 video encoding accelerator, image signal processor, MIPI CSI-2 camera interface, Ethernet with TSN, USB 2.0 High-Speed, I3C, FDCAN, SDMMC, and extensive security features.

With its combination of high-performance Arm processing, edge-AI acceleration, graphics, computer vision, multimedia, connectivity, and security, the STM32N657X0H3Q is suitable for advanced edge AI, industrial vision, smart cameras, HMI systems, robotics, IoT gateways, industrial automation, and other intelligent embedded applications.

Key Features

  • Arm Cortex-M55 32-bit processor core

  • CPU frequency up to 800 MHz

  • Arm Helium M-Profile Vector Extension

  • Half-, single-, and double-precision FPU

  • 32 KB instruction cache

  • 32 KB data cache

  • 4.2 MB contiguous SRAM

  • 128 KB ECC-protected data TCM RAM

  • 64 KB ECC-protected instruction TCM RAM

  • 8 KB backup SRAM

  • ST Neural-ART Accelerator

  • Neural-ART Accelerator frequency up to 1 GHz

  • Up to 600 GOPS neural-network performance

  • 288 MACs per cycle

  • NeoChrom 2.5D graphics accelerator

  • Chrom-ART Accelerator

  • Hardware JPEG and Motion JPEG codec

  • H.264 hardware video encoding

  • Integrated image signal processor

  • Parallel camera interface

  • 2-lane MIPI CSI-2 camera interface

  • 1-Gbit Ethernet with TSN support

  • 2 × USB 2.0 High-Speed/Full-Speed OTG controllers

  • USB Type-C Power Delivery support

  • 2 × I3C interfaces

  • 4 × I²C interfaces

  • 6 × SPI interfaces

  • 2 × SAI interfaces

  • 5 × USART interfaces

  • 5 × UART interfaces

  • 1 × LPUART

  • 2 × SDMMC interfaces

  • 3 × FDCAN interfaces

  • Advanced hardware security and cryptography

  • Arm TrustZone technology

  • Secure boot support

  • Hardware AES and public-key accelerators

  • True random number generator

  • Up to 165 general-purpose I/O pins

  • 2 × 12-bit ADCs

  • Advanced timer and PWM resources

  • Operating temperature range from -40°C to +125°C

  • 264-VFBGA package

  • 14 mm × 14 mm package

  • Industrial grade

  • ECOPACK2 compliant

Technical Specifications

Parameter Specification
Manufacturer STMicroelectronics
Part Number STM32N657X0H3Q
Product Family STM32N6
Series STM32N657X0
Category Microcontrollers
Subcategory ARM Cortex-M MCU
Core Processor Arm Cortex-M55
Core Size 32-Bit
Maximum CPU Speed 800 MHz
Neural Accelerator ST Neural-ART Accelerator
Neural Accelerator Speed Up to 1 GHz
AI Performance Up to 600 GOPS
MAC Performance 288 MAC/cycle
SRAM 4.2 MB
Data TCM RAM 128 KB ECC
Instruction TCM RAM 64 KB ECC
Backup SRAM 8 KB
GPIO Up to 165 I/O
ADC 2 × 12-Bit ADC
Ethernet 10/100/1000 Mbps with TSN
USB 2 × USB 2.0 HS/FS OTG
CAN 3 × FDCAN
I3C 2 Interfaces
I²C 4 Interfaces
SPI 6 Interfaces
USART 5 Interfaces
UART 5 Interfaces
LPUART 1 Interface
SDMMC 2 Interfaces
SAI 2 Interfaces
GPU NeoChrom 2.5D GPU
Graphics Accelerator Chrom-ART
JPEG Codec Hardware JPEG / MJPEG
Video Encoder H.264 Hardware Encoder
Camera Interface Parallel + 2-Lane MIPI CSI-2
Image Processing Integrated ISP
Security TrustZone, AES, PKA, HASH, RNG
Supply Voltage 1.71 V – 3.6 V
Operating Temperature -40°C to +125°C
Package VFBGA-264
Package Size 14 mm × 14 mm
Package Pitch 0.8 mm
Mounting Type Surface Mount
Packaging Tray
Temperature Grade Industrial
RoHS ECOPACK2
Lifecycle Status Active

The official ST product page identifies STM32N657X0H3Q as an active, volume-production device in a 264-pin VFBGA 14 mm × 14 mm package, with an industrial temperature grade.

Processor & Architecture

The STM32N657X0H3Q is built around a high-performance Arm Cortex-M55 processor operating at up to 800 MHz.

The Cortex-M55 incorporates Arm Helium technology, providing vector-processing capabilities designed for efficient digital signal processing and machine-learning workloads.

Key processor features include:

  • Arm Cortex-M55 32-bit architecture

  • Up to 800 MHz operating frequency

  • Arm M-Profile Vector Extension

  • Helium technology

  • Half-, single-, and double-precision floating-point support

  • 32 KB instruction cache

  • 32 KB data cache

  • 128 KB data TCM RAM with ECC

  • 64 KB instruction TCM RAM with ECC

  • Arm TrustZone

  • Memory Protection Unit

  • Nested Vectored Interrupt Controller

  • Embedded Trace Macrocell

The combination of Cortex-M55 processing and dedicated neural acceleration allows the STM32N657X0H3Q to handle conventional MCU workloads together with computationally intensive AI and signal-processing applications.

AI & Neural Processing

A key feature of the STM32N657X0H3Q is the integrated ST Neural-ART Accelerator, designed specifically for efficient neural-network inference at the edge.

The accelerator provides:

  • Up to 1 GHz operating frequency

  • Up to 600 GOPS performance

  • 288 MACs per cycle

  • Dedicated DNN inference hardware

  • Dedicated streaming engines

  • Real-time encryption/decryption

  • On-the-fly weight decompression

This architecture is designed to accelerate deep-neural-network workloads while reducing the processing burden on the Cortex-M55 CPU.

Typical AI applications include:

  • Object detection

  • Image classification

  • Facial recognition

  • Anomaly detection

  • Predictive maintenance

  • Audio classification

  • Sensor-based machine learning

  • Smart-camera applications

  • Industrial edge AI

ST identifies the STM32N657X0 family as part of its high-performance edge-AI MCU platform and supports the device through the ST Edge AI ecosystem.

Memory & Storage

The STM32N657X0H3Q provides a large amount of integrated SRAM for high-performance embedded applications.

Memory resources include:

  • 4.2 MB contiguous SRAM

  • 128 KB data TCM RAM with ECC

  • 64 KB instruction TCM RAM with ECC

  • 8 KB backup SRAM

  • Flexible external memory controller

  • XSPI interfaces

  • External memory encryption/decryption support

The external memory controller supports various memory technologies, including SRAM, PSRAM, SDRAM/LPSDR SDRAM, NOR Flash, and NAND Flash.

The XSPI subsystem supports serial PSRAM, NAND, NOR, HyperRAM, and HyperFlash memory formats.

Graphics & Multimedia

The STM32N657X0H3Q integrates several hardware accelerators for graphics and multimedia processing.

Key features include:

  • NeoChrom 2.5D GPU

  • Chrom-ART Accelerator

  • Hardware JPEG codec

  • Motion JPEG support

  • H.264 hardware encoder

  • LCD-TFT controller

  • Integrated image signal processor

  • Parallel camera interface

  • 2-lane MIPI CSI-2 interface

The NeoChrom GPU supports functions such as scaling, rotation, alpha blending, texture mapping, and perspective transformation.

The H.264 hardware encoder supports baseline, main, and high profiles up to level 5.2, including support for 1080p and 720p video applications.

Computer Vision & Camera Processing

The STM32N657X0H3Q is designed for advanced computer-vision applications.

The integrated ISP supports multiple image-processing functions, including:

  • Bad-pixel correction

  • Decimation

  • Black-level adjustment

  • Exposure control

  • Demosaicing

  • Column conversion

  • Contrast adjustment

  • Cropping

  • Downscaling

  • Region-of-interest processing

  • Gamma correction

  • YUV conversion

  • Pixel packing

The ISP output can be transferred directly toward the neural-processing subsystem through DMA, enabling efficient camera-to-AI processing pipelines.

Communication & Connectivity

The STM32N657X0H3Q provides extensive high-speed communication capabilities.

Supported interfaces include:

  • 1-Gbit Ethernet with TSN

  • 2 × USB 2.0 High-Speed/Full-Speed OTG

  • USB Type-C Power Delivery

  • 4 × I²C

  • 2 × I3C

  • 6 × SPI

  • 2 × SAI

  • 5 × USART

  • 5 × UART

  • 1 × LPUART

  • 2 × SDMMC

  • 3 × FDCAN

The combination of Gigabit Ethernet, TSN, USB, I3C, FDCAN, and high-speed serial interfaces makes the device suitable for connected industrial equipment and edge-computing systems.

Security Features

The STM32N657X0H3Q integrates advanced hardware security features for connected and intelligent embedded systems.

Security features include:

  • Arm TrustZone

  • Secure boot ROM

  • Secure customer-key provisioning

  • Hardware unique key

  • Secure firmware update support

  • Two AES coprocessors

  • DPA-resistant cryptographic hardware

  • Public-key accelerator

  • HASH accelerator

  • True random number generator

  • 96-bit unique device ID

  • OTP fuse storage

  • Active tamper detection

  • External-memory encryption and decryption

The device is designed to support modern embedded security architectures and ST states that the platform is SESIP Level 3 and Arm PSA certified.

Analog & Timer Peripherals

The STM32N657X0H3Q provides a range of analog and timing peripherals.

Key resources include:

  • 2 × ADCs

  • Up to 12-bit ADC resolution

  • Up to 5 Msps ADC conversion rate

  • Up to 20 ADC channels

  • Temperature sensor

  • Analog data filter

  • Multi-data filter

  • 4 × 32-bit timers

  • 2 × advanced motor-control timers

  • 13 × general-purpose 16-bit timers

  • 5 × low-power timers

  • Independent watchdog

  • Window watchdog

  • RTC

  • SysTick timer

These peripherals support industrial control, sensor processing, motor control, measurement systems, and real-time embedded applications.

Applications

The STM32N657X0H3Q is suitable for a wide range of advanced embedded applications, including:

  • Edge AI

  • Artificial Intelligence

  • Machine Vision

  • Smart Cameras

  • Computer Vision

  • Industrial Automation

  • Robotics

  • Predictive Maintenance

  • Industrial IoT

  • IoT Gateways

  • Human-Machine Interfaces

  • Smart Displays

  • Audio Processing

  • Image Processing

  • Video Processing

  • Industrial Networking

  • Gigabit Ethernet Applications

  • Smart Home Devices

  • Security Systems

  • Advanced Consumer Electronics

  • Embedded AI Systems

Benefits

The STM32N657X0H3Q combines an 800 MHz Arm Cortex-M55, dedicated 600 GOPS Neural-ART AI acceleration, 4.2 MB SRAM, advanced graphics, computer vision, multimedia, networking, and security features in a single MCU.

Its integrated neural accelerator enables efficient edge-AI inference without requiring a separate external AI processor, while the NeoChrom GPU, ISP, JPEG codec, and H.264 encoder provide hardware acceleration for graphics, image, and video workloads.

The combination of Gigabit Ethernet with TSN, USB High-Speed, I3C, FDCAN, SDMMC, and extensive serial interfaces also provides flexible connectivity for sophisticated industrial and IoT systems.

Packaging & Ordering Information

Parameter Details
Manufacturer STMicroelectronics
Part Number STM32N657X0H3Q
Product Family STM32N6
Series STM32N657X0
Core Arm Cortex-M55
Maximum Frequency 800 MHz
Neural Accelerator ST Neural-ART
AI Performance Up to 600 GOPS
SRAM 4.2 MB
Package VFBGA-264
Package Size 14 mm × 14 mm
Package Pitch 0.8 mm
Number of Pins 264
GPIO Up to 165 I/O
Mounting Type Surface Mount
Temperature Grade Industrial
Operating Temperature -40°C to +125°C
Supply Voltage 1.71 V – 3.6 V
Packaging Tray
RoHS ECOPACK2
Lifecycle Active / Volume Production

ST officially lists STM32N657X0H3Q as an Active product in volume production, supplied in a 264-pin VFBGA 14 mm × 14 mm × 1 mm package with 0.8 mm pitch.

Datasheet

For complete electrical characteristics, pin configuration, memory architecture, Cortex-M55 specifications, Neural-ART accelerator details, camera interfaces, graphics features, security functions, communication peripherals, absolute maximum ratings, and application information, please refer to the official STMicroelectronics documentation.

Datasheet: Official STM32N657X0H3Q Datasheet

Frequently Asked Questions

What is STM32N657X0H3Q?

The STM32N657X0H3Q is a high-performance 32-bit microcontroller from STMicroelectronics' STM32N6 series, designed for edge AI, computer vision, graphics, multimedia, and advanced embedded applications.

What processor core does STM32N657X0H3Q use?

The device uses an Arm Cortex-M55 processor core with Arm Helium vector-processing technology.

What is the maximum operating frequency of STM32N657X0H3Q?

The Cortex-M55 processor operates at up to 800 MHz.

Does STM32N657X0H3Q have an AI accelerator?

Yes. It integrates the ST Neural-ART Accelerator, which operates at up to 1 GHz and provides up to 600 GOPS of neural-network processing performance.

How much SRAM does STM32N657X0H3Q have?

The device provides 4.2 MB of contiguous SRAM, plus ECC-protected TCM memory and 8 KB backup SRAM.

Does STM32N657X0H3Q support machine vision?

Yes. The device integrates a camera pipeline, ISP, parallel camera interface, 2-lane MIPI CSI-2 interface, Neural-ART accelerator, and graphics/video processing hardware, making it highly suitable for machine-vision and smart-camera applications.

Does STM32N657X0H3Q support Ethernet?

Yes. It supports 10/100/1000 Mbps Ethernet with Time-Sensitive Networking (TSN).

Does STM32N657X0H3Q support USB?

Yes. The device provides 2 × USB 2.0 High-Speed/Full-Speed OTG controllers, with one controller supporting USB Type-C Power Delivery.

How many CAN interfaces does STM32N657X0H3Q have?

The STM32N657X0H3Q provides 3 × FDCAN interfaces with TTCAN capability.

What package is used for STM32N657X0H3Q?

The STM32N657X0H3Q is supplied in a 264-pin VFBGA package, measuring approximately 14 mm × 14 mm, with a 0.8 mm pitch.

What is the operating voltage of STM32N657X0H3Q?

The specified application supply-voltage range is 1.71 V to 3.6 V.

What is the operating temperature of STM32N657X0H3Q?

The industrial version is specified for an operating temperature range of -40°C to +125°C.

Is STM32N657X0H3Q an active product?

Yes. STMicroelectronics currently lists STM32N657X0H3Q as Active and in volume production.

What applications is STM32N657X0H3Q suitable for?

It is suitable for edge AI, machine vision, smart cameras, robotics, industrial automation, IoT gateways, computer vision, industrial networking, smart HMI systems, image processing, video processing, and other advanced embedded applications.

Can I request bulk pricing for STM32N657X0H3Q?

Yes. Contact our sales team with your required quantity and delivery destination to request current pricing, stock availability, MOQ, lead time, and shipping options.

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