SAM L11 MCU Overview

Microchip's SAM L11 MCU is the industry’s first and lowest power ARM® Cortex®-M23 MCU featuring chip-level security and ARM TrustZone® Technology, consuming less than 25 µA/MHz in active mode and less than 100 nA in Ssleep mode. It features secure key storage, chip-level tamper resistance, crypto accelerators, secure boot, secure bootloader, enhanced peripheral touch controller, advanced analog, ISO7816 smart card interface, Event System, and SleepWalking peripherals.

IoT nodes driven by a SAM L11 provide strong resistance to remote software attacks thereby increasing the reliability and avoiding downtime of the critical functions of the nodes. The combination of security offered by TrustZone for ARMv8-M and additional hardware-enforced security will help protect from cloning and intellectual property theft.

The SAM L11 comes in 24- and 32-pin package options and is targeted for use in IoT and security, low power, capacitive touch, and general purpose embedded control applications


Key Features


  • ARM Cortex-M23
  • 32 MHz (2.62 CoreMark/MHz and up to 31 DMIPS)
  • Single-cycle hardware multiplier
  • Hardware divider
  • Nested Vector Interrupt Controller (NVIC)
  • Memory Protection Unit (MPU)

Operating Voltage Range:

  • 1.62 V to 3.63 V


  • 64 KB Flash
  • 16 KB SRAM
  • 2 KB Data Flash section for non-volatile data storage
  • 256 bytes TrustRAM with physical protection features

Ultra Low-Power:

  • Active, Idle, Standby with partial, or full SRAM retention and off Sleep modes
  • Active mode (< 25 μA/MHz)
  • Idle mode (< 10 μA/MHz) with 1.5 μs wake-up time
  • Standby with Full SRAM Retention (0.5 μA) with 5.3 μs wake-up time
  • Off mode (< 100 nA)


  • Secure Boot with SHA-based authentication
  • Arm TrustZone for flexible hardware isolation of memories and peripherals
  • AES-128, SHA-256, and GCM cryptography accelerators
  • Chip-level tamper detection to resist microprobing attacks
  • Silent access for side channel attack resistance
  • Rapid Tamper Erase on scrambling key and RAM data
  • Data remanence prevention
  • Address and Data scrambling with user-defined key
  • One True Random Generator (TRNG)

Enhanced Peripheral Touch Controller (PTC):

  • Driven Shield Plus for moisture tolerance and noise immunity
  • Parallel Acquisition through Polarity control
  • Supports wake-up on touch from Standby Sleep mode

Advanced Analog:

  • 12-bit, 1 MSPS Analog-to-Digital Converter (ADC)
  • Analog Comparators (AC) with window compare function
  • 10-bit, 350 KSPS DAC with external and internal outputs
  • Operational Amplifiers

Serial Communication Interfaces (SERCOM) that can operate as:

  • USART, I2C, LIN, SPI, ISO7816, RS-485

Qualification and Class-B Support:

  • AEC-Q100 REVH, Grade 1: -40ºC to +125ºC (planned)
  • Class-B safety library, IEC 60730 (planned)

Temperature options:

  • -40 C to 85 C
  • -40 C to 125 C

Development Support:

  • Atmel Studio 7 IDE
  • Atmel START Software Framework
  • Two-pin Serial Wire Debug (SWD) programming and debugging interface

Block Diagram


 Learn More

Explore the SAM L11 MCU:

Processor & Architecture
Learn more >
Clock System Overview
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