ATSAMD21J15B-MFT - 48MHz Cortex-M0+ MCU, 32KB Flash | Microchip
料号： ATSAMD21J15B-MFT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.48 | $3.48 |
| 10 | $3.21 | $32.10 |
| 100 | $2.86 | $286.00 |
| 500 | $2.54 | $1,270.00 |
| 1,000 | $2.39 | $2,390.00 |
ATSAMD21J15B-MFT 概述
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.
直接替换替代料： ATSAMD21J15B-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： ATSAMD21J15B-MFT （相同外形与封装尺寸） ——差异在于 ADC, Operating Temperature, Package, DAC, Core Architecture.
快速对比工具——选择替代料号进行并排对比：
ATSAMD21J16B-MFT
✅ 直接替换✓ 有现货
$2.2 / 个
查看数据手册 →ATSAMD21J17B-MFT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD21J18B-MFT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD21J15A-MFT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD21J15B-MFT 最大额定值与电气特性
| 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 |
| 封装 | 64-pin QFN (9x9 mm) |
| Operating Voltage (VDD) | 1.62 V to 3.63 V |
| 工作温度 | -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 |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| MSL 等级 | 3 (168 hours) |
ATSAMD21J15B-MFT 引脚配置
| 引脚 1 | PA00 — GPIO / XIN32 (32.768 kHz crystal input) |
| 引脚 2 | PA01 — GPIO / XOUT32 (32.768 kHz crystal output) |
| 引脚 3 | PA02 — GPIO / AIN0 (ADC input channel 0) |
| 引脚 4 | PA03 — GPIO / AIN1 / VREFA (ADC reference) |
| 引脚 5 | GND — Ground |
| 引脚 6 | VDD — Digital supply voltage |
| 引脚 7 | PA04 — GPIO / AIN2 / VREFB |
| 引脚 8 | PA05 — GPIO / AIN3 |
| 引脚 9 | PA06 — GPIO / AIN4 |
| 引脚 10 | PA07 — GPIO / AIN5 |
| 引脚 11 | PA08 — GPIO / AIN6 / NMI |
| 引脚 12 | PA09 — GPIO / AIN7 |
| 引脚 13 | PA10 — GPIO / AIN8 |
| 引脚 14 | PA11 — GPIO / AIN9 |
| 引脚 15 | GND — Ground (pad) |
| 引脚 16 | VDD — Digital supply voltage |
| 引脚 17 | PA12 — GPIO |
| 引脚 18 | PA13 — GPIO |
| 引脚 19 | PA14 — GPIO |
| 引脚 20 | PA15 — GPIO |
| 引脚 21 | PA16 — GPIO / I2S SD |
| 引脚 22 | PA17 — GPIO |
| 引脚 23 | PA18 — GPIO |
| 引脚 24 | PA19 — GPIO |
| 引脚 25 | PA20 — GPIO |
| 引脚 26 | PA21 — GPIO |
| 引脚 27 | PA22 — GPIO / I2S FS |
| 引脚 28 | PA23 — GPIO / I2S SCK |
| 引脚 29 | PA24 — GPIO / USB_DM |
| 引脚 30 | PA25 — GPIO / USB_DP |
| 引脚 31 | GND — Ground |
| 引脚 32 | VDD — Digital supply voltage |
| 引脚 33 | PB00 — GPIO |
| 引脚 34 | PB01 — GPIO |
| 引脚 35 | PB02 — GPIO / AIN10 |
| 引脚 36 | PB03 — GPIO / AIN11 |
| 引脚 37 | PB04 — GPIO / AIN12 |
| 引脚 38 | PB05 — GPIO / AIN13 |
| 引脚 39 | PB06 — GPIO / AIN14 |
| 引脚 40 | PB07 — GPIO / AIN15 |
| 引脚 41 | PB08 — GPIO / AIN16 |
| 引脚 42 | PB09 — GPIO / AIN17 |
| 引脚 43 | PB10 — GPIO / AIN18 |
| 引脚 44 | PB11 — GPIO / AIN19 |
| 引脚 45 | PB12 — GPIO |
| 引脚 46 | PB13 — GPIO |
| 引脚 47 | PB14 — GPIO |
| 引脚 48 | PB15 — GPIO |
| 引脚 49 | PB16 — GPIO |
| 引脚 50 | PB17 — GPIO |
| 引脚 51 | PB18 — GPIO |
| 引脚 52 | PB19 — GPIO |
| 引脚 53 | PB20 — GPIO |
| 引脚 54 | PB21 — GPIO |
| 引脚 55 | PB22 — GPIO |
| 引脚 56 | PB23 — GPIO |
| 引脚 57 | PB24 — GPIO |
| 引脚 58 | PB25 — GPIO |
| 引脚 59 | PA27 — GPIO |
| 引脚 60 | PA28 — GPIO |
| 引脚 61 | GND — Ground |
| 引脚 62 | VDD — Digital supply voltage |
| 引脚 63 | PA30 — GPIO / SWCLK (programming) |
| 引脚 64 | PA31 — GPIO / SWDIO (programming) |
典型应用
ATSAMD21J15B-MFT 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： ATSAMD21J15B-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 | 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 |
关键差异点
- Functional Safety (FuSa) support on revision B silicon （对比 ATSAMD21J15A-MFT)
- USB 2.0 Full-Speed with on-chip transceiver （对比 ATSAMD21E15B-AU)
- Up to 52 GPIO on 64-pin QFN （对比 ATSAMD21G18A-MF)
设计说明
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.
合规信息
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.
