Microchip Technology ATSAMR21E17A-MFT

Overview

ATSAMR21E17A-MFT from Microchip Technology (formerly Atmel) is a 32-bit ARM Cortex-M0+ wireless microcontroller in a 32-pin QFN package, integrating 128KB Flash, 16KB SRAM, a 2.4GHz ISM-band transceiver with -99dBm RX sensitivity and +4dBm TX output, and operating at up to 48MHz. It targets low-power IoT sensor nodes requiring embedded RF connectivity, real-time control, and capacitive touch interfaces.

For engineers reviewing the ATSAMR21E17A-MFT datasheet, ATSAMR21E17A-MFT pinout, ATSAMR21E17A-MFT application, or ATSAMR21E17A-MFT equivalent, key selection criteria include its integrated 2.4GHz transceiver performance, SleepWalking peripheral autonomy, SERCOM-configurable serial interfaces, and QFN32 footprint compatibility with space-constrained edge devices.

Technical Context

The ATSAMR21E17A-MFT implements an ARM Cortex-M0+ core with Micro Trace Buffer and single-cycle multiplier, paired with a hardware-assisted MAC for IEEE 802.15.4-compliant packet handling. Its clock system combines DFLL48M and FDPLL96M for precise frequency synthesis across CPU, USB, and RF domains.

Peripherals are orchestrated via a 12-channel Event System enabling inter-peripheral signaling without CPU intervention, and SleepWalking allows peripherals like ADC or RTC to operate autonomously in standby mode-waking only the CPU upon threshold crossing or result readiness.

Key Specifications

Pinout & Package

ATSAMR21E17A-MFT uses a 32-pin QFN package (5mm × 5mm, 0.5mm pitch) with exposed thermal pad connected to GND. The package complies with JEDEC MO-220, MSL3, and supports standard reflow per J-STD-20.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wireless microcontroller applications.

Compared with ATSAMR21G17A-MFT, the ATSAMR21E17A-MFT trades I/O and SERCOM count for smaller footprint and lower cost in endpoint nodes; versus STM32WLE5JC, it offers native 2.4GHz IEEE 802.15.4 support but lacks LoRa modulation and Sub-GHz regulatory certifications.

Availability

ATSAMR21E17A-MFT is available at Aetrix Electronics and suitable for smart home sensor nodes, industrial wireless monitors, wireless lighting controllers, and capacitive touch remotes requiring stable component supply and long-term production continuity.

Supply support for ATSAMR21E17A-MFT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology acquired Atmel in 2016 and continues development of the SMART ARM-based microcontroller portfolio, emphasizing low-power, secure, and wireless-embedded solutions.

The SAM R21 product line was designed specifically for battery-operated IoT endpoints requiring integrated 2.4GHz RF, deterministic real-time control, and hardware-accelerated security - targeting Zigbee, Thread, and proprietary 2.4GHz mesh protocols.

FAQ

What is the maximum operating frequency and core architecture of the ATSAMR21E17A-MFT?

The ATSAMR21E17A-MFT features an ARM Cortex-M0+ processor core rated for up to 48MHz operation. It includes a single-cycle hardware multiplier, Micro Trace Buffer for code flow analysis, and Thumb-2 instruction set compatibility with Cortex-M3/M4 devices. This architecture delivers 2.14 CoreMark/MHz efficiency while maintaining ultra-low power consumption in both active and sleep modes - critical for energy-harvesting and battery-powered ATSAMR21E17A-MFT deployments.

Does the ATSAMR21E17A-MFT include an integrated RF transceiver, and what are its key radio specifications?

Yes, the ATSAMR21E17A-MFT integrates an ultra-low-power 2.4GHz ISM-band transceiver compliant with IEEE 802.15.4 physical layer requirements. Key specs include -99dBm receiver sensitivity, +4dBm programmable transmit output power, 250kbps data rate, hardware-assisted MAC (auto-ack, auto-retry, CRC-16), and 128-byte TX/RX frame buffers. These capabilities make the ATSAMR21E17A-MFT suitable for Zigbee, Thread, and custom 2.4GHz mesh networks without external RF front-end components.

How many serial communication interfaces does the ATSAMR21E17A-MFT support, and how are they configured?

The ATSAMR21E17A-MFT includes four SERCOM modules, each configurable in runtime as USART, UART, SPI, I²C (up to 3.4MHz), or LIN slave. SERCOM0–SERCOM3 are fully accessible on the QFN32 package, with pin multiplexing managed via PORT peripheral function registers. This flexibility allows designers to implement multiple concurrent protocols - for example, I²C to a sensor, SPI to an EEPROM, and USART to a display - without adding protocol bridge ICs to the ATSAMR21E17A-MFT design.

What power management features does the ATSAMR21E17A-MFT offer for battery-powered applications?

The ATSAMR21E17A-MFT supports two primary low-power states: idle (CPU halted, peripherals active) and standby (all clocks stopped except selected ones). Its SleepWalking capability allows peripherals like RTC, ADC, and event-triggered timers to operate autonomously in standby - waking the CPU only upon threshold crossing or completion. Combined with voltage scaling, DFLL/FDPLL clock gating, and sub-µA retention current, these features enable multi-year battery life in ATSAMR21E17A-MFT-based sensor nodes.

Is the ATSAMR21E17A-MFT pin-compatible with other SAM R21 variants, and what package options exist?

The ATSAMR21E17A-MFT uses a 32-pin QFN package (5mm × 5mm) and is pin-compatible within the SAM R21E family (e.g., ATSAMR21E16A-MFT, ATSAMR21E18A-MFT), sharing identical pinout, power domains, and peripheral mappings. It is not pin-compatible with the 48-pin SAM R21G series due to differing I/O count and SERCOM allocation. All SAM R21E variants use the same QFN32 mechanical footprint and thermal pad grounding scheme, simplifying migration across Flash/SRAM configurations in the ATSAMR21E17A-MFT product line.