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ATSAMD21E18
  • ATSAMD21E18
  • ATSAMD21E18
  • ATSAMD21E18

ATSAMD21E18

In Production

A low-power, high-performance Microchip's ARM® Cortex®-M0+ based Flash microcontroller, the ATSAMD21E18 is ideal for a wide range of home automation, consumer, metering, and industrial applications. It features:256KB of flash and 32KB of SRAMUp to 48MHz operating frequencyFour serial communication modules (SERCOM) configurable as UART/USART, SPI or I2C, three 16-bit timer/counters, 32-bit Real-Time Clock and calendar, 18 PWM channels, one 14-channel 12-bit ADC, one 10-bit DACFull Speed USB Device and embedded HostSupport for up to 60 touch channels1.62V to 3.63V power supplyEasy pin migration to SAMD21G and SAMD21J devicesSupported by MPLAB X IDE and MPLAB Harmony.Functional SafetyThis device supports the ISO 26262 (ASIL B), IEC 61508 (SIL 2) and IEC 60730 (Class B) functional safety ...

Microchip Technology ATSAMD21E18 Product Info

16 April 2026 1

Parameters

Part Family

SAMD21

CPU Type

Cortex-M0+

MaxSpeed (MHz)

48

Program Memory Size (KB)

256

SRAM (KB)

32

Temp. Range Min.

-40

Temp. Range Max.

125

Operation Voltage Min.(V)

1.62

Operation Voltage Max.(V)

3.63

SPI

4

I2C

4

UART

4

QSPI

0

Crypto Engine

No

Internal Oscillator

32khz, 32Khz ULP, 8Mhz

Pin Count

32

Features

  • Single-cycle hardware multiplier
  • Micro Trace Buffer
  • 256KB in-system self-programmable Flash
  • 32KB SRAM Memory
  • Power-on reset (POR) and brown-out detection (BOD)
  • Internal and external clock options with 48MHDigital Frequency Locked Loop (DFLL48M) and 48MHto 96MHFractional
  • External Interrupt Controller (EIC)
  • 16 external interrupts
  • One non-maskable interrupt
  • Two-pin Serial Wire Debug (SWD) programming, test and debugging interface
  • Drop in compatible with SAM D20
  • Idle and standby sleep modes
  • SleepWalking peripherals
  • 12-channel Direct Memory Access Controller (DMAC)
  • 12-channel Event System
  • One 16-bit TC with compare/capture channels
  • One 8-bit TC with compare/capture channels
  • One 32-bit TC with compare/capture channels, by using two TCs
  • Up to four compare channels with optional complementary output
  • Generation of synchronized pulse width modulation (PWM) pattern across port pins
  • Deterministic fault protection, fast decay and configurable dead-time between complementary output
  • Dithering that increase resolution with up to 5 bit and reduce quantization error
  • 32-bit Real Time Counter (RTC) with clock/calendar function
  • Watchdog Timer (WDT)
  • CRC-32 generator
  • Embedded device function
  • Eight endpoints
  • USART with full-duplex and single-wire half-duplex configuration
  • I2C Bus up to 3.4MHz
  • SMBUS/PMBUS
  • SPI
  • LIN client
  • Differential and single-ended input
  • 1/2x to 16x programmable gain stage
  • Automatic offset and gain error compensation
  • Oversampling and decimation in hardware to support 13-, 14-, 15- or 16-bit resolution
  • 10-bit, 350ksps Digital-to-Analog Converter (DAC)
  • Two Analog Comparators (AC) with window compare function
  • 256-channel capacitive touch and proximity sensing
  • 26 GPIO pins
  • 32-pin TQSP, QFN, WLCSP
  • 1.62V – 3.63V

    • Description

    A low-power, high-performance Microchip's ARM® Cortex®-M0+ based Flash microcontroller, the ATSAMD21E18 is ideal for a wide range of home automation, consumer, metering, and industrial applications. It features:

    • 256KB of flash and 32KB of SRAM
    • Up to 48MHz operating frequency
    • Four serial communication modules (SERCOM) configurable as UART/USART, SPI or I2C, three 16-bit timer/counters, 32-bit Real-Time Clock and calendar, 18 PWM channels, one 14-channel 12-bit ADC, one 10-bit DAC
    • Full Speed USB Device and embedded Host
    • Support for up to 60 touch channels
    • 1.62V to 3.63V power supply
    • Easy pin migration to SAMD21G and SAMD21J devices


    Supported by MPLAB X IDE and MPLAB Harmony.

    Functional Safety

    This device supports the ISO 26262 (ASIL B), IEC 61508 (SIL 2) and IEC 60730 (Class B) functional safety standards.  

    ·   The Functional Safety Manual, FMEDA and information on the Diagnostic Software are available under NDA through the request form on the 32-bit Microcontrollers Functional Safety web page.

    ·   To request any information about the SIL 2 STL, please fill out and submit the request form on Industrial Safety Self-Test Library web page.

    ·  Learn more about  32-bit MCUs with Functional Safety capabilities including device hardware and certified software libraries. 

     

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