Atmel: The World's Lowest Power Cortex-M0+ Microcontroller

Reduce power consumption while maintaining performance! Atmel’s new low-power SAM L21 family expands the Atmel|SMART 32-bit ARM® based products using Atmel’s proprietary picoPower™ technology. Consuming just one-third the power of comparable products in the market today, it leads the way in power consumption, enabling the swelling IOT space and portable battery applications.

Atmel’s SAM L21 family delivers ultra-low power running down to 35µA/MHz in active mode running EEMBC® CoreMark®, sub 900 nA with full SRAM retention and RTC and 200 nA in the deepest sleep mode. With an ARM Cortex™-M0+ CPU, rapid wake-up times, Event System, Sleepwalking and the innovative picoPower peripherals that can remain running while the rest of the device is sleeping, the SAM L21 family is ideal for handheld and battery-operated devices in a variety of markets including IoT, consumer, industrial and portable medical applications. The new SAM L21 also features an improved low power PTC that enables wake-up from touch down to 2.5 uA.

With over 50 billion devices predicted for the IoT market by 2020, there is a need for lower power MCUs that will drive these applications without adding load to power grids or requiring frequent battery changes. Atmel’s latest microcontroller family is designed exactly for these applications, expanding battery life from years to decades.

The SAM L21 is the world’s lowest power ARM Cortex-M0+ devices expanding our product offering beyond the SAM D family to address the next generation of ultra-low power products. Atmel’s new family also integrate additional functionality like full-speed crystal-less USB, Low Power peripheral touch controller that requires no external components, Event System with 2nd generation Sleepwalking that gates both clock and power, low power 12 bit 1 Msps ADC, 12 bit DAC, DMA, timers/counters for control applications, 3x internal Op Amps, programmable custom logic and several other new features. Atmel|SMART Cortex-M0+ devices from the SAM D10 to the SAM L21 are code- and pin-compatible making it easy for designers to migrate up and down the family.


  • Low Power - advanced low power techniques
  • AES and TRNG - security and IOT
  • Peripheral Flexibility - SPI, I²C, USART, IrDA, LIN, PMBus, SM bus
  • DMA - 16 channel support
  • Full-Speed USB - Full speed Host and Device
  • Atmel QTouch® Peripheral Touch Controller
  • Scalability - 32 - 256K flash, 32 to 64 pin TQFP and QFP


  • IOT end node applications
  • Battery backup applications
  • Portable applications (medical, activity trackers, dataloggers, sensor hubs etc.)
  • Metering
  • Touch panels
  • Home automation
  • Fire and security
  • Energy harvesting
  • Wireless applications for 802.15.4, BT/BLE or Wi-Fi
Atmel The Worlds Lowest Power Cortex M0 Microcontroller secondary 1

Atmel The Worlds Lowest Power Cortex M0 Microcontroller secondary 2

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