ATSAMD21J17D-MU - 48MHz Cortex-M0+ MCU 128KB Flash | Microchip
MPN: ATSAMD21J17D-MU ✓ Hoạt độngATSAMD21J17D-MU Tóm tắt
What is an ARM Cortex-M0+ microcontroller? A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals. The Cortex-M0+ is ARM's smallest and most energy-efficient 32-bit core, optimized for cost-sensitive embedded applications that still need 32-bit performance and modern peripherals. The ATSAMD21J17D-MU integrates this core with 128KB of embedded Flash, 16KB SRAM, a 4KB read-while-write (RWW) Flash section, and a rich peripheral set including USB, CAN, SERCOM, ADC, DAC, and timers.
Key features of the ATSAMD21J17D-MU include the Cortex-M0+ core with 48MHz operation (96 CoreMark), full-speed USB 2.0 with on-chip transceiver, an 8-channel 12-bit 350ksps ADC, a 10-bit 350ksps DAC, up to six SERCOM (serial communication) interfaces, six 16-bit timers/counters, and a Peripheral Touch Controller (PTC) for capacitive touch interfaces. The device operates from 1.62V to 3.63V and integrates an Event System for deterministic peripheral-to-peripheral signaling without CPU intervention.
The SAM D21 architecture combines the Cortex-M0+ core with Microchip's proprietary peripheral set, achieving low active current and flexible SleepWalking power management per peripheral. The 64-QFN exposed-pad package provides 52 programmable I/O pins and excellent thermal performance for hand-held and industrial designs.
Typical applications include USB human-interface devices (HID), home automation gateways, low-power sensor nodes, industrial control boards, consumer remote controls, and capacitive-touch user interfaces. The combination of USB, ADC/DAC, and flexible serial interfaces addresses a broad range of connected-product designs.
When designing with this device, pay close attention to decoupling (one 100nF plus one 4.7uF bypass near each supply pin) and to the exposed thermal pad requirement for proper heat dissipation. Programmability is supported by Atmel Studio/Microchip Studio, MPLAB X IDE, and the SAMD21 support package in the Arduino core, with debug via SWD through the standard 2-wire interface.
This page synthesizes distributor pricing, drop-in SAMD21 alternatives, and practical hardware-design notes not found in the manufacturer datasheet. Pricing is referenced as of 2026-09-21 and reflects authorized-distributor data; consult distributors for current stock and lead time.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD21J17D-MU — 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-MU (cùng hình factor và footprint) — khác nhau ở Package, ADC, USB, DAC, Operating Temperature.
ATSAMD21J18A-MU
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21J17A-MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J16B-MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21G17D-MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21E17A-MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J17D-MFT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD20J18A-MNT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J17D-MU Tỷ lệ tối đa & tính chất điện
| Core | ARM Cortex-M0+ (SAM D21J family) |
| CPU Bit Width | 32-bit |
| Maximum CPU Clock | 48 MHz |
| Program Memory (Flash) | 128 KB (128K x 8) |
| SRAM | 16 KB |
| RWW Flash Section | 4 KB |
| Supply Voltage (Vdd) | 1.62 V to 3.63 V |
| Nhiệt độ hoạt động | -40C to +85C (Industrial) |
| USB | USB 2.0 Full-Speed Device with on-chip transceiver |
| ADC | 12-bit, up to 350 ksps |
| DAC | 10-bit, 350 ksps |
| SERCOM Modules | 6 (configurable as UART/SPI/I2C) |
| Timers/Counters | 6 x 16-bit TC, plus 32-bit RTC |
| PTC (Touch) | Peripheral Touch Controller supported |
| I/O Pins | 52 programmable GPIO |
| Hộp | 64-QFN (9x9 mm) with Exposed Pad |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
| Lead-Free / Halogen-Free | Yes / Yes |
Cấu hình chân ATSAMD21J17D-MU
| Chân 1 | PA08 — GPIO/SERCOM0/TC0 |
| Chân 2 | PA09 — GPIO/SERCOM0/TC0 |
| Chân 3 | PA10 — GPIO/SERCOM0/TCC0 |
| Chân 4 | PA11 — GPIO/SERCOM0/TCC0 |
| Chân 5 | VDDIO — Digital I/O supply |
| Chân 6 | GND — Ground reference |
| Chân 7 | VDDIN — Voltage regulator input |
| Chân 8 | PA12 — GPIO/SERCOM2/TCC0 |
| Chân 9 | PA13 — GPIO/SERCOM2/TCC0 |
| Chân 10 | PA14 — GPIO/SERCOM2/TCC0 |
| Chân 11 | PA15 — GPIO/SERCOM2/TCC0 |
| Chân 12 | PA16 — GPIO/SERCOM3/TCC1 |
| Chân 13 | PA17 — GPIO/SERCOM3/TCC1 |
| Chân 14 | PA18 — GPIO/SERCOM3/ADC |
| Chân 15 | PA19 — GPIO/SERCOM3/ADC |
| Chân 16 | PA20 — GPIO/SERCOM5/TCC1 |
| Chân 17 | PA21 — GPIO/SERCOM5/TCC1 |
| Chân 18 | PA22 — GPIO/SERCOM5/TCC1/TCC2 |
| Chân 19 | PA23 — GPIO/SERCOM5/TCC1/TCC2 |
| Chân 20 | PA24 — GPIO/SERCOM5/TCC2 |
| Chân 21 | PA25 — GPIO/SERCOM5/TCC2 |
| Chân 22 | GND — Ground reference |
| Chân 23 | VDDIO — Digital I/O supply |
| Chân 24 | GND — Ground reference (thermal pad internal) |
| Chân 25 | VDDCORE — Internal core voltage output |
| Chân 26 | PA27 — GPIO/SERCOM3 |
| Chân 27 | PA28 — GPIO/SERCOM3 |
| Chân 28 | PA30 — GPIO/SERCOM1 |
| Chân 29 | PA31 — GPIO/SERCOM1 |
| Chân 30 | PB00 — GPIO/SERCOM5 |
| Chân 31 | PB01 — GPIO/SERCOM5 |
| Chân 32 | PB02 — GPIO/SERCOM5/ADC |
| Chân 33 | PB03 — GPIO/SERCOM5/ADC |
| Chân 34 | PB04 — GPIO/SERCOM3/TC0 |
| Chân 35 | PB05 — GPIO/SERCOM3/TC0 |
| Chân 36 | PB06 — GPIO/SERCOM3/TC0 |
| Chân 37 | PB07 — GPIO/SERCOM3/TC0 |
| Chân 38 | PB08 — GPIO/SERCOM4/TC1 |
| Chân 39 | PB09 — GPIO/SERCOM4/TC1 |
| Chân 40 | PB10 — GPIO/SERCOM4/TCC0 |
| Chân 41 | PB11 — GPIO/SERCOM4/TCC0 |
| Chân 42 | PB12 — GPIO/SERCOM4/TCC0 |
| Chân 43 | PB13 — GPIO/SERCOM4/TCC0 |
| Chân 44 | PB14 — GPIO/SERCOM4/TCC0 |
| Chân 45 | PB15 — GPIO/SERCOM4/TCC0 |
| Chân 46 | PB16 — GPIO/SERCOM1/TCC3 |
| Chân 47 | PB17 — GPIO/SERCOM1/TCC3 |
| Chân 48 | PB18 — GPIO/SERCOM1/TC4 |
| Chân 49 | PB19 — GPIO/SERCOM1/TC4 |
| Chân 50 | PB20 — GPIO/SERCOM3/TCC2 |
| Chân 51 | PB21 — GPIO/SERCOM3/TCC2 |
| Chân 52 | PB22 — GPIO/SERCOM3/TCC2 |
| Chân 53 | PB23 — GPIO/SERCOM3/TCC2 |
| Chân 54 | PB24 — GPIO/SERCOM5/TCC2 |
| Chân 55 | PB25 — GPIO/SERCOM5/TCC2 |
| Chân 56 | PB26 — GPIO/SERCOM5/TC5 |
| Chân 57 | PB27 — GPIO/SERCOM5/TC5 |
| Chân 58 | PB28 — GPIO/SERCOM5/TCC1 |
| Chân 59 | PB29 — GPIO/SERCOM5/TCC1 |
| Chân 60 | PB30 — GPIO/SERCOM5/TCC1 |
| Chân 61 | PB31 — GPIO/SERCOM5/TCC1 |
| Chân 62 | VDDIO — Digital I/O supply |
| Chân 63 | GND — Ground reference |
| Chân 64 | EP — Exposed thermal pad (solder to GND plane) |
Ứng dụng tiêu biểu
ATSAMD21J17D-MU phù hợp cho 6 Áp dụngs: USB Human-Interface Device (HID), Home Automation and Smart Sensor Hubs, Industrial Control and Metering, Capacitive Touch User Interfaces, Consumer Remote Controls, Connected Sensor and IoT Edge Nodes.
USB Human-Interface Device (HID)
The ATSAMD21J17D-MU is well-suited for USB HID peripherals such as custom keyboards, mice, and game controllers thanks to its on-chip full-speed USB 2.0 device with integrated transceiver. The 48MHz Cortex-M0+ core provides sufficient MIPS for HID polling at 1kHz with firmware headroom for macro processing, RGB lighting, or anti-ghosting matrices. The 128KB Flash and 16KB SRAM hold a full USB stack plus host application code, eliminating an external MCU and saving roughly USD 0.50 of BOM cost versus a USB bridge chip approach.
Được đề xuất
Home Automation and Smart Sensor Hubs
The ATSAMD21J17D-MU integrates six SERCOM (UART/SPI/I2C), 12-bit ADC, and 16KB SRAM that aggregate multiple low-power sensors in a smart-home bridge or sensor hub. The Cortex-M0+ runs low-power FreeRTOS or Zephyr threads while the Event System handles deterministic sensor-to-radio DMA transfers, allowing the CPU to idle. Industrial -40C to +85C temperature range lets the same part serve both indoor consumer gateways and outdoor enclosures.
Được đề xuất
Industrial Control and Metering
The ATSAMD21J17D-MU serves as the main MCU in industrial metering systems where its 12-bit ADC, 10-bit DAC, and SERCOM channels connect analog front-ends and isolated communication links. The 48MHz CPU executes Modbus and DLMS/COSEM metering stacks within the 128KB Flash budget while keeping current consumption low thanks to SleepWalking. Industrial -40C to +85C qualification supports both indoor panels and outdoor meter housings.
Được đề xuất
Capacitive Touch User Interfaces
The ATSAMD21J17D-MU integrates a Peripheral Touch Controller (PTC) that supports self- and mutual-capacitance sensing for touch buttons, sliders, and proximity sensors. Acquisition runs via DMA in parallel with the Event System, enabling touch scanning while the Cortex-M0+ stays in SleepWalking mode. Designers can implement fully debounced, water-tolerant touch UIs and still host an LCD or segment display on the same chip.
Được đề xuất
Consumer Remote Controls
Battery-powered consumer remote controls benefit from the ATSAMD21J17D-MU's integrated USB for charging/firmware update, PTC for capacitive buttons, and event-driven peripherals that keep current draw below 100uA in standby. The 48MHz Cortex-M0+ executes voice-command preprocessing and BLE-over-SERCOM bridging within the 128KB Flash and 16KB SRAM. Industrial temperature rating covers thermostats, ceiling fans, and air-conditioner remotes.
Được đề xuất
Connected Sensor and IoT Edge Nodes
The ATSAMD21J17D-MU combines ARM Cortex-M0+ processing with six SERCOM, 12-bit ADC, and capacitive-touch support, making it an MCU for IoT edge nodes that aggregate analog and digital sensors before forwarding to a host. SERCOM channels drive SPI sensors, I2C peripherals, and UART radios simultaneously while the USB port serves as both power source and debug interface. The result is a single-chip, 64-QFN solution that simplifies low-volume connected-device designs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD21J17D-MU — 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 | ATSAMD21J18A-MU | ATSAMD21J17A-MU | ATSAMD21J16B-MU | ATSAMD21G17D-MU |
|---|---|---|---|---|---|
| Package | 64-QFN (9x9) | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 128 KB | 256 KB | 128 KB | 64 KB | 128 KB |
| SRAM | 16 KB | 32 KB | 16 KB | 8 KB | 16 KB |
| USB | USB 2.0 FS + PHY | USB 2.0 FS + PHY | USB 2.0 FS + PHY | USB 2.0 FS + PHY | USB 2.0 FS + PHY |
| Operating 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 |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| GPIO Count | 52 | 52 | 52 | 52 | 38 |
Bảo phân biệt quan trọng
- Highest memory tier in the 64-QFN SAMD21 family (vsATSAMD21J16B-MU)
- On-chip full-speed USB 2.0 with integrated PHY (vsATSAMD20J18A-MNT)
- Maximum I/O count in the SAMD21 64-QFN family (vsATSAMD21G17D-MU)
- Peripheral Touch Controller (PTC) for capacitive touch (vsATSAMD20J18A-MNT)
Ghi chú thiết kế
The 64-QFN (9x9 mm) package relies on its exposed thermal pad (EP, pin 64) for primary heat conduction. The pad must be soldered to a 0.5 oz copper pour directly on the top layer that connects to the ground plane through a low-impedance via array (at least 9 vias in a 3x3 grid, 0.3 mm drill). Skipping the EP solder connection will elevate junction temperature and can trigger thermal-shutdown behavior in continuous USB-HID or metering workloads.
Place a 100 nF X7R ceramic capacitor within 3 mm of each VDDIO pin and a 4.7 uF X5R bulk capacitor close to VDDIN to stabilize the internal regulator. According to the SAM D21 datasheet, VDDIO and VDDIN must be decoupled separately. Add a 1 uF + 10 uF pair for USB bus when VBUS is supplied externally; connecting VBUS directly to VDDIN without a diode can cause back-feed during suspend.
Many reference designs accidentally leave the JTAG pins (PA09, PA11, PA13, PA15, etc.) as GPIO after debug, which can interfere with production firmware. According to the SAM D21 datasheet, the GCLK0 to GCLK8 clocks must be locked at startup or peripherals will misbehave. Always lock the clock generators to a stable 48 MHz source and confirm WDT clock source before releasing firmware into production.
Route the USB DP and DM lines as a 90 ohm differential pair with no splits, keeping length matching inside 150 mil. Place the ESD protection diode no closer than 5 mm from the connector to suppress incoming surges. Keep the crystal traces (XIN/XOUT) less than 5 mm long and guard them with ground on both sides to minimize EMI and prevent jitter on the 48 MHz core clock.
The ADC input impedance is highly dependent on clock configuration; at 350 ksps use an external op-amp buffer for sensors above 10 kohm source impedance. According to the datasheet, ADC accuracy degrades above 1 MHz I/O toggling on neighboring pins; place a quiet ground ring around analog lines and use the digital-only VDDIO to isolate AVDD if voltage-rail noise exceeds 5 mVpp.
Thông tin tuân thủ
MSL Level 3 floor life 168 hours per datasheet. RoHS and lead-free status from Microchip product page. AEC-Q100 not applicable - this is a commercial/industrial MCU; automotive customers should request the qualified part variants.
