ATSAMD21E17D-MFT - 48MHz Cortex-M0+ MCU 128KB Flash 32-QFN | Microchip
料号： ATSAMD21E17D-MFT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $3.1 | $31.00 |
| 100 | $2.74 | $274.00 |
| 500 | $2.41 | $1,205.00 |
| 1,000 | $2.15 | $2,150.00 |
ATSAMD21E17D-MFT 概述
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.
直接替换替代料： ATSAMD21E17D-MFT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATSAMD21E17D-MFT （相同外形与封装尺寸） ——差异在于 ADC, Package, DAC, Operating Temperature, RoHS Status.
快速对比工具——选择替代料号进行并排对比：
ATSAMD21E17A-MFT
✅ 直接替换✓ 有现货
$2.55 / 个
查看数据手册 →ATSAMD21E17A-MU
✅ 直接替换✓ 有现货
$2.18 / 个
查看数据手册 →ATSAMD21E17D-AF
✅ 直接替换✓ 有现货
$2.83 / 个
查看数据手册 →ATSAMD21E17D-MUT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD21E16B-MU
✅ 直接替换✓ 有现货
$2.65 / 个
查看数据手册 →ATSAMD21E17D-MFT 最大额定值与电气特性
| 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 |
| 工作温度 | -40 °C to +125 °C (extended) |
| 封装 | 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) |
| RoHS 状态 | Compliant (Green / lead-free) |
| MSL 等级 | MSL3 (JEDEC J-STD-020) |
| Cryptography | AES (128-bit hardware accelerator) |
ATSAMD21E17D-MFT 引脚配置
| 引脚 1 | PA00 — GPIO / XIN32 (32.768 kHz crystal input) |
| 引脚 2 | PA01 — GPIO / XOUT32 (32.768 kHz crystal output) |
| 引脚 3 | PA02 — GPIO / AIN0 (ADC analog input) |
| 引脚 4 | PA03 — GPIO / AIN1 / VREFA (ADC reference) |
| 引脚 5 | GND — Ground |
| 引脚 6 | VDD — Core / IO supply 1.62-3.63 V |
| 引脚 7 | PA04 — GPIO / AIN2 / VREFB |
| 引脚 8 | PA05 — GPIO / AIN3 |
| 引脚 9 | PA06 — GPIO / AIN4 |
| 引脚 10 | PA07 — GPIO / AIN5 |
| 引脚 11 | PA08 — GPIO / AIN6 / SERCOM0 |
| 引脚 12 | PA09 — GPIO / AIN7 / SERCOM0 |
| 引脚 13 | PA10 — GPIO / AIN8 / SERCOM2 |
| 引脚 14 | PA11 — GPIO / AIN9 / SERCOM2 / USB D- |
| 引脚 15 | PA12 — GPIO / SERCOM2 / USB D+ |
| 引脚 16 | PA13 — GPIO / SERCOM4 |
| 引脚 17 | PA14 — GPIO / SERCOM4 |
| 引脚 18 | PA15 — GPIO / SERCOM3 |
| 引脚 19 | PA16 — GPIO / SERCOM1 / I²C SDA |
| 引脚 20 | PA17 — GPIO / SERCOM1 / I²C SCL |
| 引脚 21 | PA18 — GPIO / SERCOM3 |
| 引脚 22 | PA19 — GPIO / SERCOM3 |
| 引脚 23 | PA20 — GPIO / SERCOM5 |
| 引脚 24 | PA21 — GPIO / SERCOM5 |
| 引脚 25 | PA22 — GPIO / SERCOM5 / I²S FS |
| 引脚 26 | PA23 — GPIO / SERCOM5 / I²S SCK |
| 引脚 27 | PA24 — GPIO / USB SOF |
| 引脚 28 | PA25 — GPIO / USB VBUS detect |
| 引脚 29 | RESET — Reset (active low, internal pull-up) |
| 引脚 30 | VDDIO — IO supply reference |
| 引脚 31 | VDDIN — Voltage regulator input |
| 引脚 32 | EP — Exposed thermal pad (connect to GND) |
典型应用
ATSAMD21E17D-MFT 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ATSAMD21E17D-MFT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Latest silicon revision with improved brown-out-reset edge-case behavior （对比 ATSAMD21E17A-MFT)
- Integrated USB 2.0 Full-Speed with on-chip transceiver （对比 ATSAMD20E18A-MU)
- Compact 5x5 mm 32-QFN form factor with 26 GPIO （对比 PIC16F721-I/SO)
设计说明
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.
合规信息
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.
