ATSAMD21J17D-AF - ARM Cortex-M0+ 48MHz MCU, 128KB Flash, TQFP-64 | Microchip
MPN: ATSAMD21J17D-AF ✓ Hoạt độngATSAMD21J17D-AF Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD21J17D-AF — 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 ATSAMD21J17D-AF (cùng hình factor và footprint) — khác nhau ở MSL Level, Package, ADC, DAC, Mounting Type.
ATSAMD21J17A-AF
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J17A-AUT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J18D-AF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21J16D-AF
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21J17D-AF Tỷ lệ tối đa & tính chất điện
| 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) |
| Điện áp cung cấp | 1.62 V to 3.63 V |
| Nhiệt độ hoạt động | -40 °C to +125 °C (extended) |
| Hộp | 64-TQFP (10 x 10 mm) |
| Kiểu lắp đặt | 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 |
| Cấp MSL | 3 (168 hours, JEDEC J-STD-020) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân ATSAMD21J17D-AF
| Chân 1 | VDDIO — Digital I/O supply voltage (1.62V to 3.63V) |
| Chân 2 | PA02 — General-purpose I/O / ADC AIN[0] |
| Chân 3 | PA03 — General-purpose I/O / ADC AIN[1] / REF positive reference |
| Chân 4 | PA04 — General-purpose I/O / ADC AIN[2] |
| Chân 5 | PA05 — General-purpose I/O / ADC AIN[3] |
| Chân 6 | PA06 — General-purpose I/O / ADC AIN[4] |
| Chân 7 | PA07 — General-purpose I/O / ADC AIN[5] |
| Chân 8 | VDDANA — Analog supply voltage |
| Chân 9 | GND — Ground |
| Chân 10 | PA08 — General-purpose I/O / ADC AIN[6] (NMI - non-maskable interrupt) |
| Chân 11 | PA09 — General-purpose I/O / ADC AIN[7] |
| Chân 12 | PA10 — General-purpose I/O / ADC AIN[8] / SERCOM2 PAD[2] |
| Chân 13 | PA11 — General-purpose I/O / ADC AIN[9] |
| Chân 14 | PA12 — General-purpose I/O / ADC AIN[10] |
| Chân 15 | PA13 — General-purpose I/O / ADC AIN[11] |
| Chân 16 | PA14 — General-purpose I/O / SERCOM2 PAD[2] |
| Chân 17 | PA15 — General-purpose I/O / SERCOM2 PAD[3] |
| Chân 18 | PA16 — General-purpose I/O / SERCOM1 PAD[0] / I2S FS |
| Chân 19 | PA17 — General-purpose I/O / SERCOM1 PAD[1] / I2S SCK |
| Chân 20 | PA18 — General-purpose I/O / SERCOM1 PAD[2] / I2S MCK |
| Chân 21 | PA19 — General-purpose I/O / SERCOM1 PAD[3] / I2S SD |
| Chân 22 | PA20 — General-purpose I/O / SERCOM5 PAD[2] |
| Chân 23 | PA21 — General-purpose I/O / SERCOM5 PAD[3] |
| Chân 24 | PA22 — General-purpose I/O / SERCOM3 PAD[0] |
| Chân 25 | PA23 — General-purpose I/O / SERCOM3 PAD[1] |
| Chân 26 | PA24 — General-purpose I/O / SERCOM3 PAD[2] |
| Chân 27 | PA25 — General-purpose I/O / SERCOM3 PAD[3] |
| Chân 28 | VDDCORE — Internal core voltage regulator output (1.2V) - decouple |
| Chân 29 | GND — Ground |
| Chân 30 | PA27 — General-purpose I/O |
| Chân 31 | PA28 — General-purpose I/O / Reset input |
| Chân 32 | PA30 — General-purpose I/O / SWCLK (programming/debug) |
| Chân 33 | PA31 — General-purpose I/O / SWDIO (programming/debug) |
| Chân 34 | PB00 — General-purpose I/O |
| Chân 35 | PB01 — General-purpose I/O |
| Chân 36 | PB02 — General-purpose I/O / SERCOM5 PAD[0] |
| Chân 37 | PB03 — General-purpose I/O / SERCOM5 PAD[1] |
| Chân 38 | PB04 — General-purpose I/O |
| Chân 39 | PB05 — General-purpose I/O |
| Chân 40 | PB06 — General-purpose I/O |
| Chân 41 | PB07 — General-purpose I/O |
| Chân 42 | PB08 — General-purpose I/O / SERCOM4 PAD[0] |
| Chân 43 | PB09 — General-purpose I/O / SERCOM4 PAD[1] |
| Chân 44 | PB10 — General-purpose I/O / SERCOM4 PAD[2] |
| Chân 45 | PB11 — General-purpose I/O / SERCOM4 PAD[3] |
| Chân 46 | PB12 — General-purpose I/O / SERCOM0 PAD[0] |
| Chân 47 | PB13 — General-purpose I/O / SERCOM0 PAD[1] |
| Chân 48 | PB14 — General-purpose I/O / SERCOM0 PAD[2] |
| Chân 49 | PB15 — General-purpose I/O / SERCOM0 PAD[3] |
| Chân 50 | PB16 — General-purpose I/O / SERCOM1 PAD[0] |
| Chân 51 | PB17 — General-purpose I/O / SERCOM1 PAD[1] |
| Chân 52 | PB18 — General-purpose I/O / SERCOM1 PAD[2] |
| Chân 53 | PB19 — General-purpose I/O / SERCOM1 PAD[3] |
| Chân 54 | PB20 — General-purpose I/O / SERCOM3 PAD[0] |
| Chân 55 | PB21 — General-purpose I/O / SERCOM3 PAD[1] |
| Chân 56 | PB22 — General-purpose I/O / SERCOM3 PAD[2] |
| Chân 57 | PB23 — General-purpose I/O / SERCOM3 PAD[3] |
| Chân 58 | USB_DM — USB Full-Speed data minus (D-) |
| Chân 59 | USB_DP — USB Full-Speed data plus (D+) |
| Chân 60 | VDDIO — Digital I/O supply voltage (1.62V to 3.63V) |
| Chân 61 | GND — Ground |
| Chân 62 | GND — Ground |
| Chân 63 | PA01 — General-purpose I/O / DAC VOUT |
| Chân 64 | PA00 — General-purpose I/O / XIN (32.768 kHz crystal) |
Ứng dụng tiêu biểu
ATSAMD21J17D-AF phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD21J17D-AF — 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 | 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 |
Bảo phân biệt quan trọng
- Latest silicon revision (Rev D) with errata fixes (vsATSAMD21J17A-AF)
- More Flash and SRAM headroom in pin-compatible upgrade (vsATSAMD21J18D-AF)
- Lowest cost pin-compatible downgrade (vsATSAMD21J16D-AF)
Ghi chú thiết kế
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.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - use ATSAMDA1J17D-AF variant for automotive OEM. Extended 125 °C operating temperature (AF suffix).
