ATSAMD21J17D-AF - ARM Cortex-M0+ 48MHz MCU, 128KB Flash, TQFP-64 | Microchip
MPN: ATSAMD21J17D-AF ✓ نشطATSAMD21J17D-AF نظرة عامة
The ARM Cortex-M0+ is the smallest and most energy-efficient member of the Cortex-M family, designed for deeply embedded 8/16-bit replacement workloads. A microcontroller (MCU) integrates a CPU core, non-volatile program memory (Flash), volatile working memory (SRAM), and a mix of analog and digital peripherals onto a single die. Compared with classic 8051 or PIC microcontrollers, Cortex-M0+ parts deliver a modern 32-bit Thumb-2 instruction set, deterministic nested-vector interrupts, and a vendor-neutral AMBA peripheral bus, while retaining ultra-low standby current. The SAMD21 family specifically adds Microchip's Event System (inter-peripheral signalling without CPU wake) and SleepWalking peripherals that remain clocked while the core sleeps.
Key specifications of the ATSAMD21J17D-AF include 48 MHz maximum CPU clock, 128 KB Flash with 4 KB read-while-write region, 16 KB SRAM, six SERCOM channels configurable as UART/SPI/I2C, one full-speed USB 2.0 device port, up to 6 communication interfaces, and up to 52 programmable I/O pins. The integrated 12-bit ADC delivers up to 350 ksps, the 10-bit DAC up to 350 ksps, and the peripheral event system supports 12 channels. Operating voltage spans 1.62 V to 3.63 V with multiple low-power sleep modes down to sub-microamp standby.
Architecturally, the ATSAMD21J17D-AF uses a single-cycle hardware multiplier, separate Flash and SRAM AHB-Lite buses, and a peripheral bridge that decouples SERCOM and event traffic from the CPU. The Full-Speed USB device controller includes an on-chip transceiver and internal pull-up, eliminating external components for HID, CDC, or vendor-class USB applications. The integrated SERCOM blocks can be reassigned at runtime, providing design flexibility when moving pins between UART, SPI, and I2C.
Typical applications include home automation controllers (Zigbee/Matter bridges, smart thermostats), consumer products (USB HID peripherals, wearables), metering (gas/water/electricity counters with LCD), and industrial sensor hubs (Modbus nodes, 4-20 mA loop replacements). The extended 125°C temperature rating also supports automotive aftermarket and outdoor industrial use cases.
When designing with this MCU, allocate at least one SERCOM channel for UART debug console, plan the USB DP/DN trace impedance for 90 ohm differential, and use the Event System to wake the CPU on peripheral triggers instead of polling. The 128 KB Flash and 16 KB SRAM are sufficient for an RTOS kernel plus an application, but compiler -Os and a memory pool allocator are recommended for production builds.
بدائل مباشرة لـ ATSAMD21J17D-AF — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع ATSAMD21J17D-AF (نفس عامل الشكل والبصمة) — يختلف في MSL Level, Package, ADC, DAC, Mounting Type.
ATSAMD21J17A-AF
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ATSAMD21J17A-AUT
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←ATSAMD21J18D-AF
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ATSAMD21J16D-AF
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
ATSAMD21J17D-AF الحدود القصوى والخصائص الكهربائية
| Manufacturer | Microchip Technology |
| Series | SAM D21J, Functional Safety (FuSa) |
| Core | ARM Cortex-M0+ |
| Core Size | 32-Bit |
| Maximum CPU Clock | 48 MHz |
| Program Memory Size | 128 KB Flash (128K x 8) |
| Program Memory Type | Flash |
| RAM Size | 16 KB |
| Read-While-Write Region | 4 KB |
| Number of I/O Pins | 52 (maximum, package-dependent) |
| جهد التغذية | 1.62 V to 3.63 V |
| درجة حرارة التشغيل | -40 °C to +125 °C (extended) |
| العلبة | 64-TQFP (10 x 10 mm) |
| نوع التركيب | Surface Mount |
| ADC | 12-bit, up to 20 channels |
| DAC | 10-bit, 1 channel |
| USB | Full-Speed USB 2.0 Device with on-chip transceiver |
| Communication Interfaces | Up to 6 SERCOM (UART/SPI/I2C), I2S, USB |
| Timers | TC x 3, TCC x 2, RTC x 1 |
| مستوى MSL | 3 (168 hours, JEDEC J-STD-020) |
| حالة RoHS | Compliant |
| Lead-Free | Yes |
تكوين أطراف ATSAMD21J17D-AF
| دبوس 1 | VDDIO — Digital I/O supply voltage (1.62V to 3.63V) |
| دبوس 2 | PA02 — General-purpose I/O / ADC AIN[0] |
| دبوس 3 | PA03 — General-purpose I/O / ADC AIN[1] / REF positive reference |
| دبوس 4 | PA04 — General-purpose I/O / ADC AIN[2] |
| دبوس 5 | PA05 — General-purpose I/O / ADC AIN[3] |
| دبوس 6 | PA06 — General-purpose I/O / ADC AIN[4] |
| دبوس 7 | PA07 — General-purpose I/O / ADC AIN[5] |
| دبوس 8 | VDDANA — Analog supply voltage |
| دبوس 9 | GND — Ground |
| دبوس 10 | PA08 — General-purpose I/O / ADC AIN[6] (NMI - non-maskable interrupt) |
| دبوس 11 | PA09 — General-purpose I/O / ADC AIN[7] |
| دبوس 12 | PA10 — General-purpose I/O / ADC AIN[8] / SERCOM2 PAD[2] |
| دبوس 13 | PA11 — General-purpose I/O / ADC AIN[9] |
| دبوس 14 | PA12 — General-purpose I/O / ADC AIN[10] |
| دبوس 15 | PA13 — General-purpose I/O / ADC AIN[11] |
| دبوس 16 | PA14 — General-purpose I/O / SERCOM2 PAD[2] |
| دبوس 17 | PA15 — General-purpose I/O / SERCOM2 PAD[3] |
| دبوس 18 | PA16 — General-purpose I/O / SERCOM1 PAD[0] / I2S FS |
| دبوس 19 | PA17 — General-purpose I/O / SERCOM1 PAD[1] / I2S SCK |
| دبوس 20 | PA18 — General-purpose I/O / SERCOM1 PAD[2] / I2S MCK |
| دبوس 21 | PA19 — General-purpose I/O / SERCOM1 PAD[3] / I2S SD |
| دبوس 22 | PA20 — General-purpose I/O / SERCOM5 PAD[2] |
| دبوس 23 | PA21 — General-purpose I/O / SERCOM5 PAD[3] |
| دبوس 24 | PA22 — General-purpose I/O / SERCOM3 PAD[0] |
| دبوس 25 | PA23 — General-purpose I/O / SERCOM3 PAD[1] |
| دبوس 26 | PA24 — General-purpose I/O / SERCOM3 PAD[2] |
| دبوس 27 | PA25 — General-purpose I/O / SERCOM3 PAD[3] |
| دبوس 28 | VDDCORE — Internal core voltage regulator output (1.2V) - decouple |
| دبوس 29 | GND — Ground |
| دبوس 30 | PA27 — General-purpose I/O |
| دبوس 31 | PA28 — General-purpose I/O / Reset input |
| دبوس 32 | PA30 — General-purpose I/O / SWCLK (programming/debug) |
| دبوس 33 | PA31 — General-purpose I/O / SWDIO (programming/debug) |
| دبوس 34 | PB00 — General-purpose I/O |
| دبوس 35 | PB01 — General-purpose I/O |
| دبوس 36 | PB02 — General-purpose I/O / SERCOM5 PAD[0] |
| دبوس 37 | PB03 — General-purpose I/O / SERCOM5 PAD[1] |
| دبوس 38 | PB04 — General-purpose I/O |
| دبوس 39 | PB05 — General-purpose I/O |
| دبوس 40 | PB06 — General-purpose I/O |
| دبوس 41 | PB07 — General-purpose I/O |
| دبوس 42 | PB08 — General-purpose I/O / SERCOM4 PAD[0] |
| دبوس 43 | PB09 — General-purpose I/O / SERCOM4 PAD[1] |
| دبوس 44 | PB10 — General-purpose I/O / SERCOM4 PAD[2] |
| دبوس 45 | PB11 — General-purpose I/O / SERCOM4 PAD[3] |
| دبوس 46 | PB12 — General-purpose I/O / SERCOM0 PAD[0] |
| دبوس 47 | PB13 — General-purpose I/O / SERCOM0 PAD[1] |
| دبوس 48 | PB14 — General-purpose I/O / SERCOM0 PAD[2] |
| دبوس 49 | PB15 — General-purpose I/O / SERCOM0 PAD[3] |
| دبوس 50 | PB16 — General-purpose I/O / SERCOM1 PAD[0] |
| دبوس 51 | PB17 — General-purpose I/O / SERCOM1 PAD[1] |
| دبوس 52 | PB18 — General-purpose I/O / SERCOM1 PAD[2] |
| دبوس 53 | PB19 — General-purpose I/O / SERCOM1 PAD[3] |
| دبوس 54 | PB20 — General-purpose I/O / SERCOM3 PAD[0] |
| دبوس 55 | PB21 — General-purpose I/O / SERCOM3 PAD[1] |
| دبوس 56 | PB22 — General-purpose I/O / SERCOM3 PAD[2] |
| دبوس 57 | PB23 — General-purpose I/O / SERCOM3 PAD[3] |
| دبوس 58 | USB_DM — USB Full-Speed data minus (D-) |
| دبوس 59 | USB_DP — USB Full-Speed data plus (D+) |
| دبوس 60 | VDDIO — Digital I/O supply voltage (1.62V to 3.63V) |
| دبوس 61 | GND — Ground |
| دبوس 62 | GND — Ground |
| دبوس 63 | PA01 — General-purpose I/O / DAC VOUT |
| دبوس 64 | PA00 — General-purpose I/O / XIN (32.768 kHz crystal) |
التطبيقات النموذجية
ATSAMD21J17D-AF مناسب لـ 6 التطبيقs: Home Automation Hub, USB HID Peripheral, Smart Metering End Point, Industrial Sensor Hub, Consumer Wearable Device, Automotive Aftermarket Module.
Home Automation Hub
The ATSAMD21J17D-AF fits home automation hubs where 128 KB Flash fits Zigbee/Matter bridge firmware, 16 KB SRAM serves TLS session buffers, and 48 MHz Cortex-M0+ handles message routing with deterministic interrupt latency. The 6 SERCOM channels map directly to UART for debug console, SPI for the radio module, I2C for sensors, and I2S for audio chime features, while USB enables firmware upgrade via PC tether. The 1.62-3.63 V range supports 3.3 V wall-adapter and battery-backup topologies simultaneously.
موصى به
USB HID Peripheral
The ATSAMD21J17D-AF's integrated full-speed USB 2.0 device controller with on-chip transceiver and internal pull-up removes the external 5 V-tolerant buffer normally required for keyboards, mice, and custom HID devices. The 48 MHz core plus 128 KB Flash easily fits USB stacks from TinyUSB or LUFA, leaving headroom for product firmware. The 52 programmable I/Os support 22+ key matrix or 64 mechanical-key scanning with room for RGB underglow LED drivers.
موصى به
Smart Metering End Point
The ATSAMD21J17D-AF suits gas, water, and electricity metering end points where its low-power SleepWalking peripherals enable ADC sampling of sensor signals while the core sleeps, drawing sub-microamp standby current on battery-only installations. The 128 KB Flash stores metrology algorithms, calibration tables, and DLMS/COSEM protocol stacks; the 16 KB SRAM buffers burst consumption data. The extended -40 to +125 °C rating matches outdoor or basement meter enclosures without derating.
موصى به
Industrial Sensor Hub
For industrial sensor hubs aggregating Modbus RTU, 4-20 mA loop, and discrete I/O channels, the ATSAMD21J17D-AF's 48 MHz core plus 6 SERCOM channels map cleanly to multiple UART/SPI/I2C buses without external transceivers. The 12-bit ADC handles 4-20 mA loop measurements with external current-sense resistors, while the 10-bit DAC generates excitation signals for bridge sensors. The extended temperature rating covers factory-floor enclosures and outdoor cabinet installations.
موصى به
Consumer Wearable Device
Wearable designs (fitness bands, smart watches, medical patches) benefit from the ATSAMD21J17D-AF's 1.62-3.63 V supply range (single Li-ion / coin cell support), Cortex-M0+ efficiency, and SleepWalking peripherals that wake the CPU only on heart-rate sensor events. The integrated 12-bit ADC captures bioimpedance and PPG signals, the 10-bit DAC drives LED bias, and the SERCOM I2C connects the IMU and heart-rate sensor with no external glue logic.
موصى به
Automotive Aftermarket Module
Although not AEC-Q100 qualified, the ATSAMD21J17D-AF's extended 125 °C temperature rating and rugged 64-TQFP package suit aftermarket automotive accessories (telematics dongles, OBD-II adapters, GPS loggers) where cost is primary. The full-speed USB device port emulates a serial port for OBD-II pass-through, the Cortex-M0+ runs the CAN-to-USB bridge, and the 128 KB Flash stores trip data. For OEM automotive designs, use the ATSAMDA1J17D-AF AEC-Q100 variant instead.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ ATSAMD21J17D-AF — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | ATSAMD21J17A-AF | ATSAMD21J17A-AUT | ATSAMD21J18D-AF | ATSAMD21J16D-AF |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (10x10 mm) | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same | 64-TQFP (10x10 mm) - same |
| Core / Architecture | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit | ARM Cortex-M0+ 32-bit |
| Maximum CPU Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 128 KB | 128 KB | 128 KB | 256 KB | 64 KB |
| SRAM | 16 KB | 16 KB | 16 KB | 32 KB | 8 KB |
| USB 2.0 FS Device | Yes (on-chip transceiver) | Yes | Yes | Yes | Yes |
| Silicon Revision | Rev D (latest) | Rev A (older) | Rev A (older) | Rev D | Rev D |
| Operating Temperature | -40 °C to +125 °C (extended) | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C | -40 °C to +125 °C |
أبرز الفروقات
- Latest silicon revision (Rev D) with errata fixes (مقابلATSAMD21J17A-AF)
- More Flash and SRAM headroom in pin-compatible upgrade (مقابلATSAMD21J18D-AF)
- Lowest cost pin-compatible downgrade (مقابلATSAMD21J16D-AF)
ملاحظات التصميم
Decoupling: Place a 0.1 µF ceramic capacitor within 3 mm of every VDD, VDDIO, and VDDANA pin, with a 1 µF bulk capacitor on the VDD rail. The on-chip core regulator requires a 1 µF decoupling cap on VDDCORE (pin 28). Estimated: at 48 MHz active and 3.3 V supply, the MCU draws ~9 mA active and ~2 µA in backup mode (sleep with full SRAM retention). Routing AVDD separately from VDDIO via a ferrite bead is recommended when ADC measurements must reject digital switching noise.
USB trace layout: Route USB DP (pin 59) and USB DM (pin 58) as a 90 ohm differential pair on the top layer with continuous reference ground plane beneath. Match lengths to within 150 mil, keep series in-line components to a minimum, and avoid stubs. The TQFP-64 thermal pad (GND pins 9, 29, 61, 62) should be soldered to a continuous copper pour to reduce theta-JA for hot-temperature applications. For JTAG/SWD programming, route PA30 (SWCLK) and PA31 (SWDIO) together with the reset pin to a 10-pin Cortex Debug header.
Clock configuration: GCLK0 must be configured for the CPU before any peripheral clock distribution is enabled, otherwise peripherals may lock up. ADC readings can drift if the analog reference source is unstable - use the internal 1.0 V bandgap with the 1/2 VDDANA reference for ratiometric measurements. The 32.768 kHz crystal (XIN/XOUT on PA00/PA01) must use a low-ESR crystal with the recommended load capacitors; otherwise the GCLK failure detection will trigger a system reset. Estimated: full chip erase at 3.3 V takes ~80 ms via the NVMCTRL.
معلومات الامتثال
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - use ATSAMDA1J17D-AF variant for automotive OEM. Extended 125 °C operating temperature (AF suffix).
