ATSAMD21E17A-MF
ATSAMD21E17A-MF - 48MHz Cortex-M0+ MCU 128KB Flash | Microchip
The Microchip Technology ATSAMD21E17A-MF is a low-power, high-performance 32-bit ARM Cortex-M0+ flash microcontroller from the SAM D21E family, packaged in a 32-pin VQFN (5x5 mm) with an exposed thermal pad. It integrates 128 KB of Flash, 16 KB of SRAM, and operates at up to 48 MHz with 2.46 CoreMark/MHz, while supporting a wide 1.62 V to 3.63 V supply that targets battery-powered and energy-harvested applications.
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals. The Cortex-M0+ is the smallest and most cost-optimized member of the ARM Cortex-M family, designed for deterministic embedded control with a Thumb-2 instruction set, low interrupt latency, and ultra-low sleep current. The ATSAMD21E17A-MF sits inside the broader hierarchy: MCU -> Cortex-M0+ microcontroller -> SAM D21 family -> 32-pin VQFN package. Its peripheral set (SERCOM, ADC, DAC, USB, timers) makes it a versatile system-on-chip for connected and sensor-driven products.
Key features include a full-speed USB 2.0 device interface with internal PHY, six SERCOM serial communication channels that can each be configured as UART, SPI, or I2C, a 12-bit 1 MSPS analog-to-digital converter with up to 20 channels, a 10-bit 350 kSPS digital-to-analog converter, two analog comparators, a 24-bit timer/counter for control applications, and an Event System for hardware-triggered peripheral interaction without CPU intervention. An on-chip 32 kHz RTC oscillator and a fractional digital phase-locked loop (FDPLL) provide flexible clocking, while 6 KB of user-accessible signature area supports secure boot and identity.
The device employs a single-cycle hardware multiplier, a nested vectored interrupt controller (NVIC), and Microchip's Sleepwalking peripheral gating for sub-microamp sleep currents down to approximately 3 microamps in full retention and less than 1 microamp in deep-power-down. Its BOD, brown-out detector, and WDT safeguard code execution under fault conditions. The 1.62 V minimum VDD permits operation from a single Li-ion, two AA cells, or energy-harvested supplies, broadening its applicability across consumer and industrial products.
Typical applications include home automation nodes, smart metering, wearable sensor hubs, industrial control and Human-Machine Interface (HMI) panels, low-power wireless sensor networks, and USB peripherals such as HID input devices, CDC bridges, and audio class interfaces. Consumers control peripherals such as LEDs, displays, and sensors through SERCOM and PWM channels while the integrated USB enables seamless PC connectivity.
When designing with this MCU, allocate the 32 pins carefully across USB, SWD, SERCOM, ADC, and GPIO. Use the 32.768 kHz crystal and load capacitors per datasheet reference design for RTC accuracy, and follow the SAM D21 hardware checklist to enable BOD33 and proper decoupling. The USB D-PUF lines need a 90 ohm common-mode choke and ESD protection.
This page synthesizes distributor pricing, drop-in same-package SAM D20/D21 alternatives, and practical design guidance beyond the manufacturer datasheet, helping engineers select the right variant and minimize risk.
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