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Ensemble E4 Series

Dual-Core Gen AI Microcontroller

The Ensemble E4 series of Gen AI enabled microcontrollers are designed for applications demanding a combination of maximum power efficiency, high compute performance, hardware accelerated image processing and integrated security. Its innovative multicore design provides a dedicated system for power efficient operations, while the second core is ready to deliver high-performance processing when needed. In addition to the real-time cores, the E4 contains 3 NPUs that can operate independently, to fully enable advanced Edge AI/ML use-cases.

Key Benefits of E4:

  • High-Performance RTOS control and AI/ML (Artificial Intelligence/Machine Learning), including Transformer Networks and Gen AI​

  • Over 15 MB of on-die memory for more performance, security, and lower power

  • Single chip imaging pipeline with up to 2 MIPI-CSI camera interfaces + Hardware ISP & image compression capabilities

  • Low-power MCU/NPU wakes system

  • User interface and networking

E4 Specifications

High-Performance Dual-Core Microcontroller

  • High-Performance Arm® Cortex®-M55 Core, up to 400 MHz, with Helium™ Vector Processing Extension, Double-Precision FPU, 1.25MB SRAM 0-wait State Tightly- Coupled Memory, 32KB Instruction and Data Caches, Armv8.1-M ISA with Arm TrustZone®, and 4.37 CoreMark®/MHz Performance Benchmark
  • High-Efficiency Arm® Cortex®-M55 Core, up to 160 MHz, with Helium™ Vector Processing Extension, DoublePrecision FPU, 512KB of SRAM 0-wait State Tightly Coupled Memory, 32KB Instruction and Data Caches, Armv8.1-M ISA with Arm TrustZone®, and 4.37 CoreMark®/MHz Performance Benchmark
  • High-Performance 400-MHz 64-bit AXI Bus Fabric Common Across All CPUs

Efficient Micro NPUs for AI/ML Acceleration

  • 1× Arm Ethos™-U85 Neural Processing Unit (NPU) for Generative AI (NPU-HG), 256 MAC/cycle up to 400 MHz and 204 GOPS, Supporting Recurrent Neural Networks (RNN), Convolutional Neural Networks (CNN), and Transformer Networks, Fed by 128-bit wide High-Bandwidth Local Memory at over 12 GB/s
  • 2× Arm Ethos™-U55 Neural Processing Units— 1× 256 MAC/cycle up to 204 GOPS, 1× 128 MAC/cycle up to 46 GOPS
  • On-the-Fly Weight Decompression with Dedicated DMA Controller
  • More than 800× Performance Uplift from Cortex-M4 for Inference Time
  • Over 76× Less Energy Consumed when Using Ethos-U85 together with Cortex-M55

Extreme-Low Power Technology

  • Autonomous Intelligent Power Management (aiPM™)
  • FD-SOI Low Leakage Process
  • 1.3 µA Consumed in STOP Mode with LPRTC, LPTIMER, LPCMP, BOR, 4KB Utility SRAM, Wake Pins
  • As Low as 27 µA/MHz Dynamic Consumption for High-Efficiency Cortex-M55
  • Multiple Power Domains, Dynamic Power, Gating, Voltage and Clock Scaling, DC-DC Converter

On-Chip Application Memory

  • High Endurance MRAM Non-Volatile Memory
    • Up to 5.5MB
  • SRAM
    • 9.75MB total SRAM: 8MB Bulk + 1.25MB M55-HP TCM + 0.5MB M55-HE TCM
    • Optional Data Retention of Bulk SRAM and M55-HE TCM SRAM Contents
    • 4KB Always-On Utility SRAM

External Memory Interfaces

  • 2× 16-bit Hex SPI, each up to 400 MB/s SDR, 800 MB/s DDR, with Inline AES Decryption and Support for XIP and HyperBus
  • 1× SD® v4.2, eMMC™ v5.1 Channel with DMA

Secure Enclave

  • Hardware-based Root-of-Trust (RoT) with Unique Device ID
  • Secure Key Generation and Storage, Secure Certificate Storage
  • Factory-provisioned Private Keys
  • Crypto Accelerators—AES (up to AES-256), ECC (up to 384 bits), SHA (up to SHA-256), RSA (up to RSA-3072), and NIST compliant TRNG
  • Secure Debugging with Certificate Authentication

Timing Control and Measurement

  • 12× Universal High-Resolution 32-bit Timers
    • Capable of Motor and LED Lighting Control
  • 3× Low-Power Universal High-Resolution 32-bit Timers
  • 4× Watchdog Timers
  • 4× Low-Power 32-bit Timers
  • 1× Real-Time Counter
  • 4× Quadrature Encoder Counters

JPEG Encoder

  • Works in Tandem with ISP to Store Compressed
  • Images and Motion JPEG (MJPEG) Video Clips
  • Maximum Performance: 2MP at 200 FPS
  • Input Formats: YUV400, YUV420, YUV422, RGB
  • Supports JPEG ISO/IEC 10918-1, ITU-T T.81
  • Supports MJPEG T.81 Format
  • Encoding Color Space: YUV 4:0:0, 4:2:0, 4:2:2
  • Cropping, Rotation, Padding

Serial Communication Interfaces

  • 1× 10/100 Ethernet with DMA
  • 1× USB 2.0 HS/FS Host/Device with DMA
  • 1× SDIO v4.1 Channel with DMA
  • 1× CAN FD Channel up to 10 Mbps
  • 1× MIPI® I3C® Channel
  • 4× I2C Channels up to 3.4 Mbps Throughput
  • 2× Low-Power I2C Channel
  • 8× UART Channels up to 2.5 Mbps (4× with RS485 Driver Control)
  • 1× Low-Power UART Channel
  • 4× SPI Channels up to 50 Mbps Throughput
  • 1× Low-Power SPI Channel

Analog Interface Capabilities

  • 3× 12-bit ADC (18 Single-Ended Inputs)
  • 1× 24-bit ADC (4 Differential Inputs)
    • Programmable Gain Instrumentation Amplifier (1× to 128×)
  • 2× 12-bit DACs (2 channels)
  • 4× High-Speed Analog Comparators with 2.5-ns Response (16 Inputs)
  • 1× Low-Power Analog Comparator (4 Inputs)
  • Internal Temperature Sensor
  • Internal Precision Reference Voltage

Camera Interfaces

  •  1× 2-Lane MIPI D-PHY CSI-2®, 2.5 Gbps each lane
  • Option for 2× MIPI D-PHY CSI-2 Interface by using the MIPI D-PHY DSI in Slave Mode. Allows Interleaving Two Image Streams from Two Separate Image Sensors
  • 1× Camera Parallel Interface (CPI), up to 16 bits
  • 1× Low-Power CPI, up to 8 bits

ISP Acceleration Unit

  • Clocked up to 400 MHz, 64-bit Bus Connection
  • Maximum Input/Output Resolution: 2MP (1920 × 1080)
  • Configurable Frame Rate Control: 1 to 60 FPS Input Monochrome Formats: 8-bit, 10-bit
  • Conversions: Demosaic Bayer to RGB, YUV422 to YUV444 to RGB
  • Output Formats: 8-bit Monochrome, RAW 8/10/12-bit with Raster Scanning, RGB888 Planar, YUV, Y-only
  • Auto White Balance and Auto Exposure
  • Gamma Correction
  • Crop, Scale, Binning, Black Level, Gain

Display Interfaces & Graphics

  • Graphics LCD Controller
  • 1× Display Parallel Interface (DPI), up to 24-bit RGB
  •  1× 2-Lane MIPI D-PHY DSI®, 2.5 Gbps each lane
  • D/AVE 2D Graphics Processing Unit

Audio Interfaces

  • 4× I2S Synchronous Stereo Audio Interfaces
  • 1× Low-Power I2S Stereo Audio Interface
  • 4× 2-channel Pulse Density Modulation (PDM) Microphone Inputs (8 Mono Microphones)
  • 4× 2-channel Low-Power Pulse Density Modulation (LPPDM) Microphone Inputs (8 Mono Microphones)

General Input/Output

  •  Up to 136× 1.8-V GPIOs (Shared with Peripherals)
  • Up to 8× Selectable 1.8-V to 3.3-V GPIOs (Shared with Peripherals)

Clock Generation

  • LFRC – Internal Low-Frequency RC Oscillator (32.7 kHz, ±4%)
  • HFRC – Internal High-Frequency RC Oscillator (Up to 76.8 MHz, ±2%)
  • LFXO – External Low-Power Crystal Oscillator or Quartz Crystal (32.768 kHz)
  • HFXO – External High-Frequency Crystal Oscillator or Quartz Crystal (24 MHz to 38.4 MHz)
  • One Fractional-N PLL to Generate System Clock, Additional Fractional-N PLL to Generate Audio Clock

System

  • Global Event Mapping to Configurable Triggers
  • 3× 32-Channel General DMA Controllers
  • CRC Calculation Accelerator with Programmable Polynomials
  • Programmable Low Supply Voltage Detect Warning (Brown-Out Detect)
  • Power-On Reset and Brown Out Reset
  • Real-Time Clock
  • JTAG/SWD Debug Interface

Operating Parameters

  • 1.75 V to 4.8 V Primary Supply Range
  • 1.08 V to 1.98 V I/O Supply Range (1.8 V I/O)
  • 3.0 V to 4.0 V I/O Supply Range (3.3 V Flex I/O)
  • -40 °C to 85 °C Extended Ambient Temperature Range
  • -40 °C to 125 °C Extended Junction Temperature Range

Packages

  • WLCSP216, 0.4 mm Pitch
  • FBGA194, 0.5 mm Pitch
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