Ensemble E1 Series

Single Core Microcontroller

The Ensemble E1 Series of microcontrollers have been designed from the ground up for maximum power savings, without compromising performance, security, or size. The Cortex-M55 core in the E1 Series makes it an excellent upgrade to your current general purpose 32-bit microcontroller, or add the optional Neural Processing Unit to run accelerated AI/ML workloads at the edge. E1 is a popular choice for wearables, hearables, and health devices.

Key Benefits of E1:

  • RTOS control & communication​​

  • Low-power AI/ML acceleration

  • Diverse interfaces and analog


High-Efficiency MCU Core
  • 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
Efficient Micro NPU for AI/ML Acceleration
  • 1× Arm Ethos™-U55 Neural Processing Unit— 128 MAC/cycle up to 46 GOPS, On-the-Fly Weight Decompression with Dedicated DMA Controller
  • 800× Performance Uplift from Cortex-M4 for Inference Time (Source: Arm. MobileNet V2 1.0 Model for Object Classification)
  • 76× Less Energy Consumed when Using Ethos-U55 together with Cortex-M55 (Source: Arm. Measured on Alif Semiconductor Ensemble Device. MobileNet V2 1.0 Model for Object Classification)
Extreme-Low Power Technology
  • Autonomous Intelligent Power Management (aiPM™)
  • FD-SOI Low Leakage Process
  • 1.7 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, 1.5MB
  • SRAM, 4.25MB
    • Optional Data Retention of 256KB or 512KB TCM SRAM Consuming 2.25 μA or 4.5 μA
    • 4KB Always-On Utility SRAM
    • Up to 512KB Zero Wait-State
External Memory Interfaces
  • 1× Octal SPI at up to 100 MHz for up to 100 MB/s SDR, 200 MB/s DDR, with Inline AES Decryption, XIP Mode Support, HyperBus Protocol Support, Enabling External Memory Expansion
  • 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
  • 8× Universal High-Resolution 32-bit Timers Capable of Motor and LED Lighting Control
  • 1× Watchdog Timer
  • 2× Low-Power 32-bit Timers
  • 1× Real-Time Counter
  • 4× Quadrature Encoder Counters
Serial Communication Interfaces
  • 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
  • 1× Low-Power I2C Channel
  • 6× UART Channels up to 2.5 Mbps (2× 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
  • 2× 12-bit ADC (12 Single-Ended Inputs)
  • 1× 24-bit ADC (4 Differential Inputs)
    • Programmable Gain Instrumentation Amplifier (1× to 128×)
  • 1× 12-bit DAC (l channel)
  • 2× High-Speed Analog Comparators with 2.5-ns Response (8 Inputs)
  • 1× Low-Power Analog Comparator (4 Inputs)
  • Internal Temperature Sensor
  • Internal Precision Reference Voltage
Camera Interfaces
  • 1× Low-Power Camera Parallel Interface (LPCPI), up to 8 bits
Display Interfaces & Graphics
  • Graphics LCD Controller
  • 1× Display Parallel Interface (DPI), up to 24-bit RGB
  • 1× 2-Lane MIPI DSI®
  • D/AVE 2D Graphics Processing Unit
Audio Interfaces
  • 2× 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 PDM Microphone Inputs (8 Mono Microphones)
General Input/Output
  • Up to 120× 1.8-V GPIOs (Shared with Peripherals)
  • Up to 8× Selectable 1.8-V to 3.3-V GPIOs (Shared with Peripherals)
Clock Generation
  • Internal Low-Frequency RC Oscillator (32.7 kHz, ±4%)
  • Internal High-Frequency RC Oscillator (Up to 76.8 MHz, ±1%)
  • External High-Frequency Crystal Oscillator or Quartz Crystal (24 MHz to 38.4 MHz)
  • External Low-Power Crystal Oscillator or Quartz Crystal (32.768 kHz)
  • One User Fractional Mode PLL
  • Global Event Mapping to Configurable Triggers
  • 2× 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 4.2 V Primary Supply Range
  • 1.08 V to 1.98 V I/O Supply Range (1.8 V I/O)
  • 3.0 V to 4.2 V I/O Supply Range (3.3 V Flex I/O)
  • -40 °C to 105 °C Industrial Ambient Temperature Range
  • -40 °C to 125 °C Industrial Junction Temperature Range
  • FBGA194, 0.5 mm Pitch

This field is for validation purposes and should be left unchanged.