ATSAMD21J15B-MFT - 48MHz Cortex-M0+ MCU, 32KB Flash | Microchip
MPN: ATSAMD21J15B-MFT ✓ Hoạt độngATSAMD21J15B-MFT Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program and data memory, peripherals, and I/O on one die. The ARM Cortex-M0+ is the smallest and most energy-efficient ARMv6-M core, optimized for deterministic interrupt response and ultra-low active power. Within the broader taxonomy, the ATSAMD21J15B sits at: ARM Cortex-M0+ -> 32-bit MCU -> Microcontroller -> Integrated Circuit -> Semiconductor. This position gives designers a familiar Thumb-2 instruction set, broad toolchain support (GCC, IAR, Keil, MPLAB X), and a mature software ecosystem including Microchip's ASF (Advanced Software Framework) and Harmony 3.
Key features of the ATSAMD21J15B-MFT include up to 6 SERCOM (serial communication) interfaces configurable as USART, I2C, or SPI, a 12-bit ADC with up to 20 channels, a 10-bit DAC, multiple 16-bit timer/counters, and a full-speed USB 2.0 Device with on-chip transceiver. The device also integrates a 32 kHz RTC, a 48 MHz high-accuracy internal RC oscillator (DFLL calibrated to within 2% over voltage and temperature), and an Event System for peripheral-to-peripheral signaling without CPU intervention.
The SAM D21 architecture uses a single AHB-APB bus matrix with a dedicated bridge for DMA-driven peripheral access, enabling low-latency deterministic response. Power management supports RUN, IDLE, STANDBY, BACKUP, and OFF sleep modes with sub-microamp standby current. The 64-pin QFN package exposes up to 52 GPIO, supporting both 3.3V single-supply operation and I/O bank flexibility.
Typical applications include IoT sensor nodes, USB HID peripherals, low-power wireless gateways, industrial control front-ends, and consumer wearables. The full-speed USB device interface is particularly attractive for HID, CDC, and vendor-class designs.
Design with this device by allocating the 4 KB SRAM carefully; stack and heap consume roughly 1.5 KB on a typical Harmony 3 project, leaving about 2.5 KB for application buffers. Use the internal DFLL48M oscillator as the default clock source to minimize BOM cost, and reserve an external 32.768 kHz crystal for RTC-grade timing accuracy.
This page synthesizes distributor pricing, drop-in same-package alternatives drawn from the SAM D21 family, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD21J15B-MFT — 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 ATSAMD21J15B-MFT (cùng hình factor và footprint) — khác nhau ở ADC, Operating Temperature, Package, DAC, Core Architecture.
ATSAMD21J16B-MFT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J17B-MFT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21J18B-MFT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21J15A-MFT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21J15B-MFT Tỷ lệ tối đa & tính chất điện
| Core Architecture | ARM Cortex-M0+ (ARMv6-M) |
| Maximum CPU Frequency | 48 MHz |
| CoreMark Score | 2.46 CoreMark/MHz |
| Program Flash Memory | 32 KB |
| SRAM | 4 KB |
| Hộp | 64-pin QFN (9x9 mm) |
| Operating Voltage (VDD) | 1.62 V to 3.63 V |
| Nhiệt độ hoạt động | -40C to +125C (industrial grade) |
| GPIO Count | Up to 52 (package-dependent) |
| ADC | 12-bit, up to 20 channels |
| DAC | 10-bit, 1 channel |
| Communication Interfaces | Up to 6x SERCOM (USART/I2C/SPI) |
| USB | USB 2.0 Full-Speed Device with on-chip transceiver |
| Timers | Multiple 16-bit TC, 32-bit TCC, RTC |
| DMA Channels | 12 channels |
| Internal Oscillator | 48 MHz DFLL-calibrated RC (2% accuracy) |
| External Crystal Support | 32.768 kHz RTC crystal, 0.4-12 MHz system crystal |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Cấp MSL | 3 (168 hours) |
Cấu hình chân ATSAMD21J15B-MFT
| Chân 1 | PA00 — GPIO / XIN32 (32.768 kHz crystal input) |
| Chân 2 | PA01 — GPIO / XOUT32 (32.768 kHz crystal output) |
| Chân 3 | PA02 — GPIO / AIN0 (ADC input channel 0) |
| Chân 4 | PA03 — GPIO / AIN1 / VREFA (ADC reference) |
| Chân 5 | GND — Ground |
| Chân 6 | VDD — Digital supply voltage |
| Chân 7 | PA04 — GPIO / AIN2 / VREFB |
| Chân 8 | PA05 — GPIO / AIN3 |
| Chân 9 | PA06 — GPIO / AIN4 |
| Chân 10 | PA07 — GPIO / AIN5 |
| Chân 11 | PA08 — GPIO / AIN6 / NMI |
| Chân 12 | PA09 — GPIO / AIN7 |
| Chân 13 | PA10 — GPIO / AIN8 |
| Chân 14 | PA11 — GPIO / AIN9 |
| Chân 15 | GND — Ground (pad) |
| Chân 16 | VDD — Digital supply voltage |
| Chân 17 | PA12 — GPIO |
| Chân 18 | PA13 — GPIO |
| Chân 19 | PA14 — GPIO |
| Chân 20 | PA15 — GPIO |
| Chân 21 | PA16 — GPIO / I2S SD |
| Chân 22 | PA17 — GPIO |
| Chân 23 | PA18 — GPIO |
| Chân 24 | PA19 — GPIO |
| Chân 25 | PA20 — GPIO |
| Chân 26 | PA21 — GPIO |
| Chân 27 | PA22 — GPIO / I2S FS |
| Chân 28 | PA23 — GPIO / I2S SCK |
| Chân 29 | PA24 — GPIO / USB_DM |
| Chân 30 | PA25 — GPIO / USB_DP |
| Chân 31 | GND — Ground |
| Chân 32 | VDD — Digital supply voltage |
| Chân 33 | PB00 — GPIO |
| Chân 34 | PB01 — GPIO |
| Chân 35 | PB02 — GPIO / AIN10 |
| Chân 36 | PB03 — GPIO / AIN11 |
| Chân 37 | PB04 — GPIO / AIN12 |
| Chân 38 | PB05 — GPIO / AIN13 |
| Chân 39 | PB06 — GPIO / AIN14 |
| Chân 40 | PB07 — GPIO / AIN15 |
| Chân 41 | PB08 — GPIO / AIN16 |
| Chân 42 | PB09 — GPIO / AIN17 |
| Chân 43 | PB10 — GPIO / AIN18 |
| Chân 44 | PB11 — GPIO / AIN19 |
| Chân 45 | PB12 — GPIO |
| Chân 46 | PB13 — GPIO |
| Chân 47 | PB14 — GPIO |
| Chân 48 | PB15 — GPIO |
| Chân 49 | PB16 — GPIO |
| Chân 50 | PB17 — GPIO |
| Chân 51 | PB18 — GPIO |
| Chân 52 | PB19 — GPIO |
| Chân 53 | PB20 — GPIO |
| Chân 54 | PB21 — GPIO |
| Chân 55 | PB22 — GPIO |
| Chân 56 | PB23 — GPIO |
| Chân 57 | PB24 — GPIO |
| Chân 58 | PB25 — GPIO |
| Chân 59 | PA27 — GPIO |
| Chân 60 | PA28 — GPIO |
| Chân 61 | GND — Ground |
| Chân 62 | VDD — Digital supply voltage |
| Chân 63 | PA30 — GPIO / SWCLK (programming) |
| Chân 64 | PA31 — GPIO / SWDIO (programming) |
Ứng dụng tiêu biểu
ATSAMD21J15B-MFT phù hợp cho 6 Áp dụngs: USB HID Peripheral Devices, IoT Sensor Nodes, Industrial Control Front-Ends, Wearable Health Devices, Smart Home Sensor Hubs, Consumer Audio Accessories.
USB HID Peripheral Devices
The ATSAMD21J15B-MFT is ideal for USB Human Interface Device designs because its integrated USB 2.0 Full-Speed Device controller with on-chip transceiver eliminates the need for an external PHY, reducing BOM cost and PCB area. The 48 MHz Cortex-M0+ core handles USB protocol, HID report parsing, and host communication with ample headroom. The 32 KB Flash accommodates full HID descriptor tables, while 4 KB SRAM stores HID reports and ring buffers. Designers typically allocate two SERCOM channels for UART/I2C expansion (e.g., sensor or display), and the 12-channel DMA offloads USB endpoint transfers from the CPU for low-latency response.
Được đề xuất
IoT Sensor Nodes
For battery-powered IoT sensor nodes, the ATSAMD21J15B-MFT delivers a compelling combination of 1.4 uA STANDBY current with RTC active and sub-microamp BACKUP mode retention, enabling multi-year battery life on a single coin cell. The 12-bit ADC with up to 20 channels multiplexes multiple analog sensors (temperature, light, gas) without external signal conditioning. The internal DFLL48M oscillator eliminates an external crystal, shrinking BOM to just the MCU, decoupling caps, sensor, and antenna. Six SERCOM channels interface SPI/IoT wireless modules such as LoRa or BLE transceivers, while the Event System triggers ADC sampling autonomously.
Được đề xuất
Industrial Control Front-Ends
The ATSAMD21J15B-MFT suits industrial control front-ends with its -40C to +125C industrial temperature range and Functional Safety (FuSa) support on revision B silicon. The 12-bit ADC with hardware oversampling reaches effective 16-bit resolution for precision sensor reading (strain gauges, thermocouples via external front-end). The 64-pin QFN provides up to 52 GPIO for keypad scan, LED driving, relay control, and parallel sensor buses. Built-in SERCOM supports RS-485 transceivers via external UART, and the hardware Crypto accelerator (AES) on larger SAMD21 variants is reserved here for future upgrade paths to the J18B.
Được đề xuất
Wearable Health Devices
Wearable health monitors benefit from the ATSAMD21J15B-MFT's compact 9x9 mm QFN package, low active power (~3 mA at 48 MHz), and rich peripheral set for sensor fusion. The 12-bit ADC reads PPG (photoplethysmography) photodiode signals via transimpedance amplifier, while SERCOM interfaces I2C-based accelerometers, gyroscopes, and environmental sensors. The DAC drives haptic feedback drivers. STANDBY current of 1.4 uA with RTC enables always-on step counting, and the 64-pin QFN provides sufficient GPIO for display, touch, and battery management integration.
Được đề xuất
Smart Home Sensor Hubs
Smart home sensor hubs leverage the ATSAMD21J15B-MFT's six SERCOM interfaces to aggregate multiple wireless protocols (Zigbee, BLE, LoRa, sub-GHz) and bridge them to WiFi/Ethernet gateways via UART or SPI. The 32 KB Flash fits Thread/Zigbee application-layer stacks and Over-The-Air (OTA) update bootloaders with careful linker optimization. The hardware Crypto module (in larger variants) handles TLS handshake acceleration. The 64 GPIO on QFN provides ample pins for status LEDs, user buttons, and expansion headers typical of hub designs.
Được đề xuất
Consumer Audio Accessories
Audio accessories such as USB DACs, MIDI controllers, and headphone amplifiers use the ATSAMD21J15B-MFT as a USB Audio Class device controller. The integrated USB Full-Speed supports USB Audio 1.0 at 48 kHz/16-bit with sub-frame accuracy. The I2S interface (via SERCOM in master mode or external I2S peripheral) drives external DAC chips, while 12-bit ADC reads potentiometer or button positions. The DAC outputs DC bias or analog VU-meter signals. Low-latency USB polling (1 ms SOF) keeps audio glitch-free even under moderate CPU load from the Cortex-M0+ running HID + Audio composite device firmware.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD21J15B-MFT — 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 | ATSAMD21J16B-MFT | ATSAMD21J17B-MFT | ATSAMD21J18B-MFT | ATSAMD21J15A-MFT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-pin QFN (9x9 mm) | 64-pin QFN (9x9 mm) - same | 64-pin QFN (9x9 mm) - same | 64-pin QFN (9x9 mm) - same | 64-pin QFN (9x9 mm) - same |
| 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 | 32 KB | 64 KB | 128 KB | 256 KB | 32 KB |
| SRAM | 4 KB | 8 KB | 16 KB | 32 KB | 4 KB |
| USB | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device + Host | USB 2.0 FS Device |
| Functional Safety (FuSa) | Yes (revision B) | Yes (revision B) | Yes (revision B) | Yes (revision B) | No (revision A) |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Bảo phân biệt quan trọng
- Functional Safety (FuSa) support on revision B silicon (vsATSAMD21J15A-MFT)
- USB 2.0 Full-Speed with on-chip transceiver (vsATSAMD21E15B-AU)
- Up to 52 GPIO on 64-pin QFN (vsATSAMD21G18A-MF)
Ghi chú thiết kế
Estimated: At 48 MHz active CPU and 3.3 V supply, the ATSAMD21J15B-MFT consumes approximately 7 mA active current. In STANDBY with RTC running from a 32.768 kHz crystal, current drops to ~1.4 uA. For battery-powered designs, use the BACKUP mode (RAM retained, RTC running, sub-1 uA) for sleep intervals and wake via RTC compare match or external GPIO interrupt. Decouple VDDIN with 100 nF and 1 uF ceramic capacitors placed within 3 mm of the pin, and add a 4.7 uF bulk capacitor near the supply input for USB bus-power applications.
The 64-pin QFN (9x9 mm) package has an exposed thermal pad (EP) that must be soldered to a ground pad of at least 50% package area on the PCB for mechanical reliability and thermal dissipation. Use a via array (typically 9 vias in a 3x3 grid, 0.3 mm diameter) connecting the EP to the internal ground plane. Route high-speed USB DP/DM traces as a 90-ohm differential pair with matched length, and place the 27-ohm series termination resistors within 5 mm of the MCU pins. Keep the D+ pull-up resistor (1.5 kohm to 3.3 V) close to the D+ pin.
Common pitfalls when designing with the ATSAMD21J15B-MFT include: (1) Forgetting to enable the DFLL48M closed-loop mode after startup causes the 48 MHz internal oscillator to drift up to 5% over voltage and temperature. (2) Configuring SERCOM pads without checking the peripheral multiplexing (PMUX) register results in non-functional I/O. (3) Exceeding the absolute maximum VDD of 3.63 V during ESD events damages the USB transceiver. (4) Failing to bit-bang the ERASE pin sequence before SWD programming on locked devices causes debugger connection failures.
Thông tin tuân thủ
RoHS and REACH compliance per Microchip product declaration. Halogen-free per IEC 61249-2-21. AEC-Q100 not qualified; for automotive applications use ATSAMx21E/SAMx21G variants with explicit automotive grade suffix.
