Mfr. #:

ATSAMR21E18A-MFT

SMART ARM-Based Wireless Microcontroller

Manufacturer: Microchip

Product Category: RF Microcontrollers - MCU

RoHS: Details

Packaging: Reel

Brand: Microchip Technology

Moisture Sensitive: Yes

Product Type: RF Microcontrollers - MCU

Series: ATSAMR21

Factory Pack Quantity: 5000

Subcategory: Wireless & RF Integrated Circuits

Technology: Si

Tradename: SMART

Description

The Atmel® | SMART™ SAM R21 is a series of low-power microcontrollers using the 32-bit ARM®

Cortex®-M0+ processor and an integrated ultra-low power 2.4GHz ISM band transceiver. SAM 

R21 devices are available in 32- and 48-pin packages with up to 256KB Flash, 32KB of SRAM 

and are operating at a maximum frequency of 48MHz and reach 2.46 Coremark/MHz. They are 

designed for simple and intuitive migration with identical peripheral modules, hex compatible 

code, identical linear address map and pin compatible migration paths between all devices in the 

product series. All devices include intelligent and flexible peripherals, Atmel Event System for 

inter-peripheral signaling, and support for capacitive touch button, slider and wheel user 

interfaces.

The Atmel SAM R21 devices provide the following features: In-system programmable Flash, 

optional 512KB serial Flash,12-channel direct memory access (DMA) controller, 12-channel 

Event System, programmable interrupt controller, up to 28 programmable I/O pins, ultra-low 

power 2.4GHz ISM band transceiver with a data rate of 250kb/s, 32-bit real-time clock and 

calendar, three 16-bit Timer/Counters (TC) and three 16-bit Timer/Counters for Control (TCC), 

where each TC can be configured to perform frequency and waveform generation, accurate 

program execution timing or input capture with time and frequency measurement of digital 

signals. The TCs can operate in 8- or 16-bit mode, selected TCs can be cascaded to form a 32-bit 

TC, and the three Timer/Counters for Control have extended functions optimized for motor, 

lighting and other control applications. The series provide one full-speed USB 2.0 embedded host 

and device interface; up to five Serial Communication Modules (SERCOM) that each can be 

configured to act as an USART, UART, SPI, I2C up 3.4MHz and LIN slave; up to eight channel 

350ksps 12-bit ADC with programmable gain and optional oversampling and decimation 

supporting up to 16-bit resolution, two analog comparators with window mode, Peripheral Touch 

Controller supporting up to 48 buttons, sliders, wheels and proximity sensing; programmable 

Watchdog Timer, brown-out detector and power-on reset and two-pin Serial Wire Debug (SWD) 

program and debug interface.

All devices have accurate and low-power external and internal oscillators. All oscillators can be 

used as a source for the system clock. Different clock domains can be independently configured 

to run at different frequencies, enabling power saving by running each peripheral at its optimal 

clock frequency, and thus maintaining a high CPU frequency while reducing power consumption.

The SAM R21 devices have two software-selectable sleep modes, idle and standby. In idle mode 

the CPU is stopped while all other functions can be kept running. In standby all clocks and 

functions are stopped expect those selected to continue running. The device supports 

SleepWalking, which is the module's ability to wake itself up and wake up its own clock, and 

hence perform predefined tasks without waking up the CPU. The CPU can then be only woken on

a need basis, e.g. a threshold is crossed or a result is ready. The Event System supports 

synchronous and asynchronous events, allowing peripherals to receive, react to and send events 

even in standby mode.

The Flash program memory can be reprogrammed in-system through the SWD interface. The 

same interface can be used for non-intrusive on-chip debug of application code. A boot loader 

running in the device can use any communication interface to download and upgrade the 

application program in the Flash memory.

The SAM R21 devices are supported with a full suite of program and system development tools, 

including C compilers, macro assemblers, program debugger/simulators, programmers and 

evaluation kits.

Atmel SAM R21E / SAM R21G

SMART ARM-Based Wireless Microcontroller

DATASHEET

Atmel | SMART SAM R21 [DATASHEET] 2

Atmel-42223G–SAM-R21_Datasheet–05/2016

Features

z Processor

z ARM Cortex-M0+ CPU running at up to 48MHz

z Single-cycle hardware multiplier

z Micro Trace Buffer (MTB)

z Memories

z 768(1)/256/128/64KB in-system self-programmable Flash

z 32/16/8KB SRAM

z System

z Power-on reset (POR) and brown-out detection (BOD)

z Internal and external clock options with 48MHz Digital Frequency Locked Loop (DFLL48M) and 48MHz to 96MHz Fractional 

Digital Phase Locked Loop (FDPLL96M)

z External Interrupt Controller (EIC)

z Up to 15 external interrupts

z One non-maskable interrupt

z Two-pin Serial Wire Debug (SWD) programming, test and debugging interface

z Low Power 

z Idle and standby sleep modes

z SleepWalking peripherals

z Peripherals

z 12-channel Direct Memory Access Controller (DMAC)

z 12-channel Event System

z Integrated Ultra Low Power Transceiver for 2.4GHz ISM Band

z Supported PSDU Data rates: 250kb/s, 500kb/s, 1000kb/s and 2000kb/s(2)

z -99dBm RX Sensitivity; TX Output Power up to +4dBm

z Hardware Assisted MAC (Auto-Acknowledge, Auto-Retry)

z SFD-Detection; Spreading; De-Spreading; Framing; CRC-16 Computation

z Antenna Diversity and TX/RX Control

z 128 Byte TX/RX Frame Buffer

z Integrated 16MHz Crystal Oscillator (external crystal needed)

z PLL synthesizer with 5 MHz and 500 kHz channel spacing for 2.4GHz ISM band

z Hardware Security (AES, True Random Generator)

z Three 16-bit Timer/Counters (TC), configurable as either:

z One 16-bit TC with compare/capture channels

z One 8-bit TC with compare/capture channels

z One 32-bit TC with compare/capture channels, by using two TCs

z Three 16-bit Timer/Counters for Control (TCC), with extended functions:

z Up to four compare channels with optional complementary output

z Generation of synchronized pulse width modulation (PWM) pattern across port pins

z Deterministic fault protection, fast decay and configurable dead-time between complementary output

z Dithering that increase resolution with up to 5 bit and reduce quantization error

z 32-bit Real Time Counter (RTC) with clock/calendar function

z Watchdog Timer (WDT)

z CRC-32 generator

z One full-speed (12Mbps) Universal Serial Bus (USB) 2.0 interface

z Embedded host and device function

z Eight endpoints

z Up to five Serial Communication Interfaces (SERCOM), each configurable to operate as either:

z USART with full-duplex and single-wire half-duplex configuration

z I

2

C up to 3.4MHz

z SPI

z LIN slave

z One 12-bit, 350ksps Analog-to-Digital Converter (ADC) with up to eight external channels

z Differential and single-ended input

z 1/2x to 16x programmable gain stage

z Automatic offset and gain error compensation

z Oversampling and decimation in hardware to support 13-, 14-, 15- or 16-bit resolution

z Two Analog Comparators (AC) with window compare function

z Peripheral Touch Controller (PTC)

z 48-channel capacitive touch and proximity sensing

z I/O and Package

z 16/28 programmable I/O pins

z 32-pin and 48-pin QFN

Atmel | SMART SAM R21 [DATASHEET] 3

Atmel-42223G–SAM-R21_Datasheet–05/2016

z Operating Voltage

z 1.8V – 3.6V

z Temperature Range

z -40°C to 85°C Industrial

z -40°C to 125°C Industrial

Notes: 1. Only applicable for SAM R21E19: 256KB embedded + 512KB serial Flash.

2. High data rates (500kb/s, 1000kb/s and 2000kb/s) only applicable for T=-40°C to 85°C