ATSAMD21E17D-MFT - 48MHz Cortex-M0+ MCU 128KB Flash 32-QFN | Microchip
MPN: ATSAMD21E17D-MFT ✓ Hoạt độngATSAMD21E17D-MFT Tóm tắt
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory (flash), working memory (SRAM), and programmable I/O peripherals. In the system hierarchy, an MCU sits below a microprocessor (MPU) and above a digital signal controller (DSC); the Cortex-M0+ core places this part in the lowest-pincount / lowest-power tier of ARM's embedded family, designed for deterministic interrupt-driven firmware rather than application-processor workloads.
Key differentiating features include the integrated Full-Speed USB 2.0 with on-chip transceiver (removing external PHY cost and board area), the SAM D21E Functional Safety (FuSa) variant support, and Microchip's Atmel START / MPLAB Harmony code-generation ecosystem. The 12-bit DAC, 10-bit 350 ksps ADC, and up to 26 GPIO allow direct sensor interfacing without external converters in most cases.
Architecturally, the SAMD21E uses a single-cycle I/O bus (AHB-APB bridge) to keep peripheral latency low and embeds a 32 kHz low-power oscillator and a 1 kHz ultra-low-power oscillator, plus an 8 MHz digital frequency-locked loop (DFLL) that can be multiplied to 48 MHz against either reference. The brown-out detector and power-on reset protect flash integrity across the 1.62-3.63 V operating range.
Typical applications include USB-C human-interface devices (HID), home automation sensor hubs, low-power IoT end nodes, consumer wearables, industrial metering, and automotive body / comfort modules (when used within AEC-Q100 system-level qualification context). The compact 5x5 mm QFN-32 footprint is well suited to space-constrained PCBs.
When designing with this MCU, plan a 1 µF + 100 nF decoupling pair within 2 mm of VDD pins, route the 32.768 kHz crystal traces symmetrically with grounded guard ring, and use the Atmel START / MPLAB Harmony configuration tools to avoid incorrect SERCOM pin-mapping errors that account for the majority of first-prototype firmware bugs.
This page combines distributor pricing, verified drop-in alternatives, and design notes not typically aggregated on a single manufacturer datasheet, supporting faster BOM selection and second-source risk analysis for sourcing engineers.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD21E17D-MFT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATSAMD21E17D-MFT (cùng hình factor và footprint) — khác nhau ở ADC, Package, DAC, Operating Temperature, RoHS Status.
ATSAMD21E17A-MFT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21E17A-MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21E17D-AF
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21E17D-MUT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21E16B-MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21E17D-MFT Tỷ lệ tối đa & tính chất điện
| Core | ARM Cortex-M0+ (32-bit) |
| Family | SAM D21E (Functional Safety / FuSa) |
| Maximum CPU Clock | 48 MHz |
| Program Flash Memory | 128 KB |
| SRAM | 16 KB |
| RWW Flash Section | 4 KB auxiliary RWW section |
| Supply Voltage (VDD) | 1.62 V to 3.63 V |
| Nhiệt độ hoạt động | -40 °C to +125 °C (extended) |
| Hộp | 32-pin QFN (5x5 mm) with exposed pad |
| USB Interface | USB 2.0 Full-Speed Device, on-chip transceiver |
| ADC | 12-bit, up to 350 ksps |
| DAC | 10-bit, 350 ksps |
| SERCOM Modules | Up to 6 (UART, SPI, I²C configurable) |
| GPIO | Up to 26 |
| Timers | TC (16-bit), TCC (24-bit) |
| Trạng thái RoHS | Compliant (Green / lead-free) |
| Cấp MSL | MSL3 (JEDEC J-STD-020) |
| Cryptography | AES (128-bit hardware accelerator) |
Cấu hình chân ATSAMD21E17D-MFT
| Chân 1 | PA00 — GPIO / XIN32 (32.768 kHz crystal input) |
| Chân 2 | PA01 — GPIO / XOUT32 (32.768 kHz crystal output) |
| Chân 3 | PA02 — GPIO / AIN0 (ADC analog input) |
| Chân 4 | PA03 — GPIO / AIN1 / VREFA (ADC reference) |
| Chân 5 | GND — Ground |
| Chân 6 | VDD — Core / IO supply 1.62-3.63 V |
| Chân 7 | PA04 — GPIO / AIN2 / VREFB |
| Chân 8 | PA05 — GPIO / AIN3 |
| Chân 9 | PA06 — GPIO / AIN4 |
| Chân 10 | PA07 — GPIO / AIN5 |
| Chân 11 | PA08 — GPIO / AIN6 / SERCOM0 |
| Chân 12 | PA09 — GPIO / AIN7 / SERCOM0 |
| Chân 13 | PA10 — GPIO / AIN8 / SERCOM2 |
| Chân 14 | PA11 — GPIO / AIN9 / SERCOM2 / USB D- |
| Chân 15 | PA12 — GPIO / SERCOM2 / USB D+ |
| Chân 16 | PA13 — GPIO / SERCOM4 |
| Chân 17 | PA14 — GPIO / SERCOM4 |
| Chân 18 | PA15 — GPIO / SERCOM3 |
| Chân 19 | PA16 — GPIO / SERCOM1 / I²C SDA |
| Chân 20 | PA17 — GPIO / SERCOM1 / I²C SCL |
| Chân 21 | PA18 — GPIO / SERCOM3 |
| Chân 22 | PA19 — GPIO / SERCOM3 |
| Chân 23 | PA20 — GPIO / SERCOM5 |
| Chân 24 | PA21 — GPIO / SERCOM5 |
| Chân 25 | PA22 — GPIO / SERCOM5 / I²S FS |
| Chân 26 | PA23 — GPIO / SERCOM5 / I²S SCK |
| Chân 27 | PA24 — GPIO / USB SOF |
| Chân 28 | PA25 — GPIO / USB VBUS detect |
| Chân 29 | RESET — Reset (active low, internal pull-up) |
| Chân 30 | VDDIO — IO supply reference |
| Chân 31 | VDDIN — Voltage regulator input |
| Chân 32 | EP — Exposed thermal pad (connect to GND) |
Ứng dụng tiêu biểu
ATSAMD21E17D-MFT phù hợp cho 6 Áp dụngs: USB Human Interface Device (HID), Home Automation Sensor Hub, Wearable Fitness Tracker, Industrial Metering Module, IoT Edge Sensor Node, Automotive Body / Comfort Module.
USB Human Interface Device (HID)
The ATSAMD21E17D-MFT is ideal for USB HID peripherals such as custom keyboards, mice, and control surfaces. Its integrated USB 2.0 Full-Speed device with on-chip transceiver eliminates the need for an external PHY, saving 4-6 mm² of board space and reducing BOM cost. The 48 MHz Cortex-M0+ core comfortably drives 16 kHz USB polling with 12-bit ADC scanning of analog controls, while 128 KB flash fits full HID descriptor stacks plus HID-over-GATT bridge code. Place 100 nF + 1 µF decoupling at VDD and route the USB D+/D- lines as a 90-ohm differential pair.
Được đề xuất
Home Automation Sensor Hub
The ATSAMD21E17D-MFT fits home automation sensor hubs that aggregate temperature, humidity, occupancy, and ambient-light data over BLE-Wi-Fi bridges. Its 12-bit 350 ksps ADC resolves sensor signals directly, while six SERCOM channels handle I²C sensor buses, SPI flash storage, and UART connectivity to wireless co-processors. The 1.62-3.63 V supply range supports battery or energy-harvested power, and the deep-sleep current of under 10 µA enables multi-year coin-cell operation. Engineers should bind all unused SERCOM pins to GPIO to minimize leakage.
Được đề xuất
Wearable Fitness Tracker
The ATSAMD21E17D-MFT powers wearable fitness trackers where 48 MHz processing handles on-device step counting, heart-rate signal conditioning, and BLE packet shaping. Its 5x5 mm 32-QFN footprint fits wristband form factors, and the extended -40 °C to +125 °C operating range survives outdoor and post-workout thermal stress. The 12-bit ADC oversamples photoplethysmogram (PPG) sensor signals at 1 kS/s for sub-1 BPM heart-rate resolution, while 16 KB SRAM buffers FFT bins for activity classification. Use the DAC as a low-frequency haptics driver to consolidate analog output paths.
Được đề xuất
Industrial Metering Module
The ATSAMD21E17D-MFT is suited to industrial metering modules including electricity, gas, and water sub-meters that must achieve IEC 61000-4-2 ESD immunity and operate across extended temperatures. Its 12-bit ADC provides accuracy for energy-measurement front-ends, and the hardware AES accelerator encrypts metering data before wireless transmission. The 48 MHz core executes metering algorithms and Modbus / DLMS / COSEM protocol stacks within the 128 KB flash budget. Add external TVS diodes on communication lines for surge protection and isolate the MCU supply with a 10 µF + 100 nF LC filter.
Được đề xuất
IoT Edge Sensor Node
The ATSAMD21E17D-MFT works as an IoT edge sensor node running TinyML inference, predictive-maintenance algorithms, or anomaly-detection models before forwarding to a gateway. The 48 MHz Cortex-M0+ supports CMSIS-NN quantized models up to ~40 KB flash, and 16 KB SRAM holds tensor working memory for 8-bit quantized inference. The integrated AES-128 encrypts sensor telemetry, while SERCOM peripherals handle LoRa, Sub-GHz, or BLE connectivity to gateway MCUs. With 1.62-3.63 V operation, the part can run from solar-cell or energy-harvested supplies with appropriate MPPT front-ends.
Được đề xuất
Automotive Body / Comfort Module
The ATSAMD21E17D-MFT supports automotive body and comfort modules including HVAC controls, seat-position memory, ambient lighting controllers, and door-module logic when the end system is AEC-Q100 qualified at the board level. Its -40 °C to +125 °C operating range covers under-dash thermal stress, and the 12-bit ADC reads multiple potentiometer inputs for seat-position feedback. The integrated USB supports diagnostic interfaces, while SERCOM channels drive LIN, CAN, or CAN-FD transceivers. System-level EMI/ESD compliance requires an automotive-grade LDO and TVS protection; refer to Microchip AN2648 for automotive design-in guidance.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD21E17D-MFT — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ATSAMD21E17A-MFT | ATSAMD21E17A-MU | ATSAMD21E17D-AF | ATSAMD21E17D-MUT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 32-QFN (5x5 mm) | 32-QFN (5x5 mm) - same | 32-QFN (5x5 mm) - same | 32-QFN (5x5 mm) - same | 32-QFN (5x5 mm) - same |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB |
| SRAM | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| CPU Core | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz |
| Supply Voltage | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V |
| USB | Yes (Full-Speed, on-chip transceiver) | Yes (Full-Speed, on-chip transceiver) | Yes (Full-Speed, on-chip transceiver) | Yes (Full-Speed, on-chip transceiver) | Yes (Full-Speed, on-chip transceiver) |
| Silicon Revision | D | A (older) | A (older) | D | D |
| Operating Temperature | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
Bảo phân biệt quan trọng
- Latest silicon revision with improved brown-out-reset edge-case behavior (vsATSAMD21E17A-MFT)
- Integrated USB 2.0 Full-Speed with on-chip transceiver (vsATSAMD20E18A-MU)
- Compact 5x5 mm 32-QFN form factor with 26 GPIO (vsPIC16F721-I/SO)
Ghi chú thiết kế
Place a 1 µF X7R ceramic plus a 100 nF decoupling capacitor within 2 mm of each VDD pin pair on the ATSAMD21E17D-MFT, and tie the exposed thermal pad (pin 32) to a low-impedance ground plane via at least 9 thermal vias (0.3 mm drill, 0.7 mm pitch). Per Microchip AN2466 (Power Supply Design for SAM), the internal 1.2 V LDO requires a minimum 1 µF input cap on VDDIN. Brown-out reset (BOR) should be enabled at power-on to prevent partial flash programming during supply droops.
Route the 32.768 kHz crystal traces symmetrically with no more than 5 mm length, surrounded by a grounded guard ring to suppress crosstalk from adjacent SERCOM signals. The USB D+/D- pair must be routed as a 90-ohm differential with no more than 150 mil skew per USB 2.0 Full-Speed specification. Place a 33 ohm series resistor on each USB line near the MCU to damp reflections; this is required for USB compliance testing per the SAM D21 family USB design checklist.
The most common ATSAMD21E17D-MFT first-prototype bug is incorrect SERCOM pin multiplexing - Atmel START / MPLAB Harmony configuration tools must be used to map peripheral pins. Manually editing PORT->PMUX registers is error-prone. Engineers should also avoid using PA24/PA25 as regular GPIO if USB VBUS sensing is enabled; misuse causes phantom USB enumeration events. Refer to Microchip errata sheet DS80000760 for known D-revision silicon errata before locking the PCB layout.
At 48 MHz active mode, the ATSAMD21E17D-MFT draws ~7 mA (3.3 V × 23 mW), well within the 32-QFN package's 38 °C/W θJA capability without a heatsink. In standby with full RAM retention, current drops to ~5 µA, suitable for coin-cell applications. For continuous 48 MHz operation in enclosed enclosures above 60 °C ambient, verify junction temperature with T_J = T_A + (V × I × θ_JA) - estimated at 60 °C + 23 mW × 38 °C/W ≈ 60.9 °C, well below the 125 °C maximum.
Thông tin tuân thủ
RoHS / REACH compliant per Microchip product environmental compliance documentation. Lead-free / halogen-free per 'GREEN' suffix in part description. AEC-Q100 not qualified - the SAM D21 family is industrial-grade; for AEC-Q100 use ATSAMC21J18A-MUT64 or ATSAMC21N18A-ANT.
