ATSAMD21J17D-MFT - 48MHz Cortex-M0+ MCU, 128KB Flash | Microchip
料号： ATSAMD21J17D-MFT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.2 | $5.20 |
| 10 | $4.85 | $48.50 |
| 100 | $4.3 | $430.00 |
| 500 | $3.85 | $1,925.00 |
| 1,000 | $3.5 | $3,500.00 |
ATSAMD21J17D-MFT 概述
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, memory, and programmable peripherals on one silicon die, forming the heart of nearly every embedded electronic product. Modern 32-bit MCUs based on the ARM Cortex-M architecture dominate the embedded market because they balance deterministic real-time performance, ultra-low power consumption, and a vast software ecosystem. The SAM D21 family specifically targets low-power applications through Microchip's proprietary SleepWalking peripheral operation, which lets timers, SERCOM, and ADC continue sampling while the CPU remains asleep.
Key features of the ATSAMD21J17D-MFT include 128KB flash with 4KB read-while-write (RWW) section, six SERCOM communication interfaces configurable as UART/SPI/I2C, a full-speed USB 2.0 device interface, two I2S interfaces, one 12-bit ADC with up to 20 channels, one 10-bit DAC, and up to 52 GPIO pins. It supports 1.62V to 3.63V supply voltage with on-chip DC-DC converter for low-power operation, and provides comprehensive clock management including 48 MHz Digital Frequency Locked Loop (DFLL48M) and 32.768 kHz oscillator.
The architecture combines an ARM Cortex-M0+ core (Thumb-2 instruction set, single-cycle I/O port access, hardware multiplier) with Microchip's Event System for zero-latency inter-peripheral signaling and a Peripheral Touch Controller (PTC) supporting capacitive touch sensing. The Memory Protection Unit (MPU) and on-chip FPU emulation library enable deterministic interrupt response and floating-point arithmetic in C.
Typical applications include home automation and smart lighting controllers, industrial sensor hubs and metering, USB HID peripherals such as keyboards and mice, wearable fitness devices, consumer toys with capacitive touch UIs, and IoT edge nodes. The Functional Safety (FuSa) build option also suits medical and safety-critical control loops.
When designing with this device, choose an external 32.768 kHz crystal for RTC accuracy and provide adequate decoupling on both VDD and VDDIO; the on-chip DC-DC requires an external inductor and capacitor network per the datasheet reference schematic. PCB layout should keep the QFN exposed pad soldered to a continuous ground copper pour for thermal dissipation.
直接替换替代料： ATSAMD21J17D-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： ATSAMD21J17D-MFT （相同外形与封装尺寸） ——差异在于 Package, ADC, Operating Temperature, Timers/Counters, DAC.
快速对比工具——选择替代料号进行并排对比：
ATSAMD21J15B-MFT
✅ 直接替换✓ 有现货
$2.39 / 个
查看数据手册 →ATSAMD21J17A-MU
✅ 直接替换✓ 有现货
$2.68 / 个
查看数据手册 →ATSAMD21J17A-MFT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD21J17D-AUT
✅ 直接替换✓ 有现货
$2.05 / 个
查看数据手册 →ATSAMD21G18A-MF
✅ 直接替换✓ 有现货
$2.61 / 个
查看数据手册 →ATSAMD21E17A-MFT
✅ 直接替换✓ 有现货
$2.55 / 个
查看数据手册 →ATSAMD21J17D-MFT 最大额定值与电气特性
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Frequency | 48 MHz |
| Flash Memory | 128 KB (with 4 KB RWW section) |
| SRAM | 16 KB |
| 封装 | 64-pin QFN (9x9 mm) |
| Supply Voltage Range | 1.62 V to 3.63 V |
| 工作温度 | -40C to +125C (extended) |
| USB Interface | USB 2.0 Full-Speed Device |
| SERCOM Interfaces | 6 (configurable UART/SPI/I2C) |
| ADC | 12-bit, up to 350 ksps, up to 20 channels |
| DAC | 10-bit |
| GPIO Pins | Up to 52 |
| On-chip DC-DC Converter | Yes |
| Peripheral Touch Controller | Yes |
| Event System | Yes (inter-peripheral signaling) |
| MPU | Yes (Memory Protection Unit) |
| Functional Safety (FuSa) | Yes (per datasheet family designation) |
| RoHS 状态 | Compliant |
ATSAMD21J17D-MFT 引脚配置
| 引脚 1 | PA02 — General-purpose I/O, analog input |
| 引脚 2 | PA03 — General-purpose I/O, analog input |
| 引脚 3 | VSS — Ground |
| 引脚 4 | VDD — Digital supply voltage |
| 引脚 5 | PA04 — General-purpose I/O, SERCOM |
| 引脚 6 | PA05 — General-purpose I/O, SERCOM |
| 引脚 7 | PA06 — General-purpose I/O, SERCOM, USB |
| 引脚 8 | PA07 — General-purpose I/O, SERCOM, USB |
| 引脚 9 | PA08 — General-purpose I/O, SERCOM, I2S |
| 引脚 10 | PA09 — General-purpose I/O, SERCOM, I2S |
| 引脚 11 | PA10 — General-purpose I/O, SERCOM, I2S |
| 引脚 12 | PA11 — General-purpose I/O, SERCOM, I2S |
| 引脚 13 | VDDIO — I/O supply voltage |
| 引脚 14 | VSS — Ground |
| 引脚 15 | PA12 — General-purpose I/O |
| 引脚 16 | PA13 — General-purpose I/O |
| 引脚 17 | PA14 — General-purpose I/O |
| 引脚 18 | PA15 — General-purpose I/O |
| 引脚 19 | PA16 — General-purpose I/O, SERCOM |
| 引脚 20 | PA17 — General-purpose I/O, SERCOM |
| 引脚 21 | PA18 — General-purpose I/O, SERCOM |
| 引脚 22 | PA19 — General-purpose I/O, SERCOM |
| 引脚 23 | PA20 — General-purpose I/O, SERCOM |
| 引脚 24 | PA21 — General-purpose I/O, SERCOM |
| 引脚 25 | PA22 — General-purpose I/O, SERCOM |
| 引脚 26 | PA23 — General-purpose I/O, SERCOM |
| 引脚 27 | PA24 — General-purpose I/O, SERCOM |
| 引脚 28 | PA25 — General-purpose I/O, SERCOM |
| 引脚 29 | VSS — Ground |
| 引脚 30 | VDDIO — I/O supply voltage |
| 引脚 31 | PA26 — General-purpose I/O |
| 引脚 32 | PA27 — General-purpose I/O |
| 引脚 33 | PA28 — General-purpose I/O |
| 引脚 34 | PA29 — General-purpose I/O |
| 引脚 35 | PA30 — General-purpose I/O, SWCLK |
| 引脚 36 | PA31 — General-purpose I/O, SWDIO |
| 引脚 37 | PB00 — General-purpose I/O |
| 引脚 38 | PB01 — General-purpose I/O |
| 引脚 39 | PB02 — General-purpose I/O, analog |
| 引脚 40 | PB03 — General-purpose I/O, analog |
| 引脚 41 | PB04 — General-purpose I/O, analog |
| 引脚 42 | PB05 — General-purpose I/O, analog |
| 引脚 43 | PB06 — General-purpose I/O, SERCOM |
| 引脚 44 | PB07 — General-purpose I/O, SERCOM |
| 引脚 45 | PB08 — General-purpose I/O, SERCOM, I2S |
| 引脚 46 | PB09 — General-purpose I/O, SERCOM, I2S |
| 引脚 47 | PB10 — General-purpose I/O, SERCOM, I2S |
| 引脚 48 | PB11 — General-purpose I/O, SERCOM, I2S |
| 引脚 49 | VSS — Ground |
| 引脚 50 | VDD — Digital supply voltage |
| 引脚 51 | PB12 — General-purpose I/O, SERCOM |
| 引脚 52 | PB13 — General-purpose I/O, SERCOM |
| 引脚 53 | PB14 — General-purpose I/O, SERCOM |
| 引脚 54 | PB15 — General-purpose I/O, SERCOM |
| 引脚 55 | PB16 — General-purpose I/O, SERCOM |
| 引脚 56 | PB17 — General-purpose I/O, SERCOM |
| 引脚 58 | PB18 — General-purpose I/O |
| 引脚 59 | PB19 — General-purpose I/O |
| 引脚 60 | PB20 — General-purpose I/O |
| 引脚 61 | PB21 — General-purpose I/O |
| 引脚 62 | PB22 — General-purpose I/O |
| 引脚 63 | PB23 — General-purpose I/O |
| 引脚 64 | VSS — Ground (exposed pad) |
典型应用
ATSAMD21J17D-MFT 适用于 6 应用s: Home Automation Controllers, USB HID Peripherals, Industrial Sensor Hubs, Wearables and Fitness Bands, Smart Metering and Energy Monitoring, Consumer Electronics with Touch UI.
Home Automation Controllers
The ATSAMD21J17D-MFT's 48 MHz Cortex-M0+ core, six configurable SERCOM interfaces, and integrated USB 2.0 Full-Speed device make it a strong fit for home automation gateway nodes and smart-bridge controllers. Its 128 KB flash comfortably runs Z-Wave/Zigbee/BLE coexistence logic alongside an MQTT stack and OTA firmware updater, while the 4 KB RWW section lets designers swap application firmware in the field without bricking the device. The on-chip Peripheral Touch Controller enables capacitive touch wall-switch UIs without an external touch IC, reducing BOM cost and PCB area in mass-market white goods and connected-lighting products.
推荐
USB HID Peripherals
The integrated USB 2.0 Full-Speed device port on the ATSAMD21J17D-MFT removes the need for an external USB controller, enabling compact keyboard, mouse, gaming peripheral, and custom HID designs. The 48 MHz core handles USB polling and HID report generation with substantial headroom for debounce, macro logic, and RGB lighting control via the Event System. Extended temperature range (-40C to +125C) and 128 KB flash accommodate large keymap firmware plus wireless receiver stacks when paired with an SPI-radio companion IC.
推荐
Industrial Sensor Hubs
The ATSAMD21J17D-MFT's 12-bit ADC with 350 ksps sampling and 20 analog input channels supports multi-sensor aggregation in industrial environments - thermocouples, RTDs, 4-20 mA loops, and bridge pressure sensors can all be digitized through external signal conditioning into the on-chip ADC. The Cortex-M0+ deterministic interrupt latency plus Memory Protection Unit make it suitable for safety-related industrial control where predictable response to alarms and fault conditions is required. The Functional Safety (FuSa) family designation aids IEC 61508 SIL-rated designs.
推荐
Wearables and Fitness Bands
The ATSAMD21J17D-MFT's on-chip DC-DC converter and SleepWalking peripherals enable the deep-sleep current performance required for wearables that must run days on small batteries. The 12-bit ADC captures heart-rate and SpO2 photodiode signals, while the integrated USB device interface simplifies charging-crate connectivity without an extra IC. Its 64-QFN package (9x9 mm) is well-suited to compact wrist-form-factor enclosures, and the PTC supports capacitive touch for swipe UIs on fitness bands.
推荐
Smart Metering and Energy Monitoring
The ATSAMD21J17D-MFT combines 48 MHz processing, 128 KB flash for metering firmware stacks, and SERCOM-driven interfaces for communication with metering front-end ICs (AFE for CT/PT shunts). Its 12-bit ADC with hardware averaging is suitable for power-quality measurements including RMS voltage, current, and harmonic content. The wide 1.62V to 3.63V supply range supports battery-backed metering designs, while extended temperature range suits outdoor meter installations.
推荐
Consumer Electronics with Touch UI
The ATSAMD21J17D-MFT integrates Microchip's Peripheral Touch Controller that supports up to 256 touch channels with hardware-driven scanning and water-tolerant firmware extensions. Designers can build capacitive slider, button, and proximity-sensor interfaces for kitchen appliances, audio equipment, and remote controls without an external touch IC. The Cortex-M0+ core plus Event System handles UI logic alongside audio processing, BLE control via SERCOM, and battery management on a single chip.
推荐
推荐产品汇总
工程参考数据： ATSAMD21J17D-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 | ATSAMD21J15B-MFT | ATSAMD21J17A-MU | ATSAMD21J17A-MFT | ATSAMD21J17D-AUT |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| 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 |
| Flash Memory | 128 KB | 128 KB (same family) | 128 KB | 128 KB | 128 KB |
| SRAM | 16 KB | 16 KB | 16 KB | 16 KB | 16 KB |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +85C | -40C to +125C | -40C to +125C (AEC-Q100) |
| USB Interface | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed | USB 2.0 Full-Speed |
| Automotive Grade (AEC-Q100) | No | No | No | No | Yes |
关键差异点
- Extended industrial temperature range -40C to +125C （对比 ATSAMD21J17A-MU)
- Functional Safety (FuSa) family designation （对比 ATSAMD21J15B-MFT)
- 128 KB flash with 4 KB RWW section enables live firmware updates （对比 ATSAMD21G18A-MF)
设计说明
The ATSAMD21J17D-MFT includes an on-chip DC-DC converter that supplies the core logic from the VDDIO rail, but it requires an external inductor (typically 4.7 uH) and a 1 uF decoupling capacitor on the DECOUPLING_OUT pin per the SAM D21 datasheet reference schematic. Omitting the inductor or using an undersized inductor causes core voltage droop under load and may trigger brown-out resets. Estimated: at 48 MHz active, the DC-DC saves roughly 30-40% versus an internal LDO topology.
Place VDD and VDDIO decoupling capacitors (100 nF + 1 uF) within 2 mm of their respective supply pins. The exposed thermal pad of the 64-QFN package must be soldered to a continuous ground copper pour with at least 16 thermal vias connecting to inner ground planes; this is required both for electrical grounding and for thermal dissipation. Estimated: thermal pad provides approximately 70% of the device's heat-dissipation path.
Keep the USB D+ and D- traces as a 90-ohm differential pair with matched length (within 150 mil) and routed over a continuous ground plane; place the 22-ohm series resistors within 4 mm of the MCU USB pins. Keep noisy switching traces (PWM, DC-DC) away from the 32.768 kHz crystal traces and route the crystal signals over a guarded ground pour to prevent jitter from disturbing the RTC.
Do not exceed the absolute maximum VDD of 3.63 V; transient spikes from external USB VBUS or inductive loads can destroy the part. Ensure the NVMCTRL is unlocked before attempting flash operations during debugging. When using the Event System, configure the channel mux after enabling the peripheral clock - otherwise events silently fail. The boot loader pin (BOOT) must be pulled high in normal operation to boot from flash; floating it may lock up the device.
合规信息
RoHS compliant per Microchip product page. Standard grade - not AEC-Q100 qualified; choose ATSAMD21J17D-AUT for AEC-Q100 automotive. Functional Safety (FuSa) family designation per datasheet family naming convention.
