Microchip Technology SAM L21 Microcontrollers

Microchip Technology SAM L21 are ultralow-power microcontrollers (MCU) using the 32-bit ARM® Cortex®-M0+ processor. The processor runs at max. 48MHz (2.46 CoreMark®/MHz) and up to 256KB Flash and 40KB of SRAM. The MCUs are housed in 32-, 48-, and 64-pin package. The SAM L21 feature sophisticated power management technologies, like power domain gating, SleepWalking, ultralow-power peripherals and more that allow for very low current consumption. The highly configurable peripherals include a touch controller supporting capacitive interfaces with proximity sensing.

The SAM L21 is designed for simple and intuitive migration between SAM L devices with identical peripheral modules, compatible code and a linear address map and is compatible with the SAM D family of general-purpose MCUs.


  • Processor
    • ARM Cortex-M0+ CPU running at up to 48MHz
    • Single-cycle hardware multiplier
    • Micro Trace Buffer
  • Memories
    • 32/64/128/256KB in-system self-programmable Flash
    • 1/2/4/8KB Flash Read-While-Write section
    • 4/8/16/32KB SRAM Main Memory
    • 2/4/8/8KB SRAM Low power Memory
  • System
    • Power-on reset (POR) and brown-out detection (BOD)
    • Internal and external clock options
    • External Interrupt Controller (EIC)
    • 16 external interrupts
    • One non-maskable interrupt
    • Two-pin Serial Wire Debug (SWD) programming, test and debugging interface
  • Low Power
    • Idle, Standby, Backup, and Off sleep modes
    • SleepWalking peripherals
    • Static and Dynamic Power Gating Architecture
    • Battery backup support
    • Two Performance Levels
    • Embedded Buck/LDO regulator supporting on-the-fly selection
  • Peripherals
    • 16-channel Direct Memory Access Controller (DMAC)
    • 12-channel Event System
    • Up to five 16-bit Timer/Counters (TC) including one low-power TC, each configurable as:
    • 16-bit TC with two compare/capture channels
    • 8-bit TC with two compare/capture channels
    • 32-bit TC with two compare/capture channels, by using two TCs


  • IoT and security
  • Smart cities
  • Home automation
  • Industrial automation
  • Smart agriculture
  • Medical devices
  • Accessories authentication
  • Low power
  • Wearables
  • Gaming controls
  • Energy harvesting
  • Low power industrial
  • Sensor nodes
  • Appliances
  • Fitness trackers
  • Automotive door handles
  • Steering wheel controls
  • Keypads
  • Remote controls


Publicado: 2017-08-02 | Actualizado: 2023-06-19