ATSAMD21J15B-MUT - 48MHz Cortex-M0+ 32KB Flash MCU
MPN: ATSAMD21J15B-MUT ✓ Hoạt độngATSAMD21J15B-MUT Tóm tắt
An ARM Cortex-M0+ microcontroller is a 32-bit RISC processor core optimized for energy-efficient embedded applications, commonly used in IoT endpoints, sensor hubs, and battery-powered consumer devices. The Cortex-M0+ sits at the entry level of the ARM M-class hierarchy (M0/M0+ -> M3 -> M4 -> M7), prioritizing low power and deterministic interrupt response over raw compute. The SAMD21 family further extends this with Microchip's proprietary Smart Peripherals, low-power SleepWalking, and Event System that allow peripherals to operate autonomously while the CPU remains asleep.
The ATSAMD21J15B-MUT delivers 2.46 CoreMark/MHz performance, six SERCOM channels (configurable as UART/SPI/I2C), one full-speed USB 2.0 interface with on-chip transceiver, a 14-channel 12-bit ADC, a 10-bit DAC, and multiple timer/counter blocks. The device operates from 1.62 V to 3.63 V and supports both internal and external clock sources including a 48 MHz Digital Frequency Locked Loop (DFLL48M) and a 48 MHz to 96 MHz Fractional Digital Phase-Locked Loop (FDPLL96M).
The CPU architecture pairs the Cortex-M0+ core with a Single Precision IO Relaxed IEEE 754 Floating Point Unit (FPU) and a Memory Protection Unit (MPU) for safety-critical code isolation. Functional Safety features include hardware CRC, memory integrity checks, and a windowed watchdog timer, making the SAM D21J suitable for industrial and white-goods applications demanding IEC 60730 Class B compliance.
Typical applications include IoT sensor nodes, USB HID peripherals, home automation controllers, industrial sensor interfaces, and low-power wearable devices where the Event System and SleepWalking peripherals extend battery life by allowing autonomous sensor sampling without waking the CPU. The 64-pin QFN footprint with 0.5 mm pitch suits space-constrained PCB layouts.
Key design considerations include provision of a clean 3.3 V supply with adequate decoupling (typically 100 nF plus 4.7 µF bulk), a 32.768 kHz crystal for RTC accuracy, and proper SWD pin routing for in-circuit programming. Designers should also configure brown-out detection (BOD) thresholds appropriate for the target supply rail.
This page consolidates distributor pricing, verified drop-in alternatives within the SAM D21 family, and practical design guidance not found in the standalone datasheet, supporting engineers evaluating the ATSAMD21J15B-MUT for new designs and supply-chain resilience planning.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD21J15B-MUT — 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-MUT (cùng hình factor và footprint) — khác nhau ở ADC, Package, Operating Temperature, USB, DAC.
ATSAMD21J15B-MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J15B-MFT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J15B-AUT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J16B-MUT
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATSAMD21J17D-MU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATSAMD21J18A-AF
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATSAMD21J15B-MUT Tỷ lệ tối đa & tính chất điện
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Family | SAM D21J (Functional Safety - FuSa) |
| Maximum CPU Frequency | 48 MHz |
| CoreMark/MHz | 2.46 |
| Program Flash | 32 KB |
| SRAM | 4 KB |
| Hộp | 64-QFN (9x9 mm) with EP |
| Điện áp cung cấp | 1.62 V to 3.63 V |
| Nhiệt độ hoạt động | -40 C to +85 C (Industrial) |
| ADC | 12-bit, up to 14 channels |
| DAC | 10-bit, 1 channel |
| SERCOM | 6 channels (UART/SPI/I2C configurable) |
| USB | Full-speed USB 2.0 with on-chip transceiver |
| Timers/Counters | TC (3x 16-bit), TCC (1x 24-bit) |
| RTC | Yes, with 32 kHz crystal support |
| Debug Interface | Serial Wire Debug (SWD), 2-pin |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
Cấu hình chân ATSAMD21J15B-MUT
| Chân 1 | PA00 — GPIO / XIN32 (RTC crystal input) |
| Chân 2 | PA01 — GPIO / XOUT32 (RTC crystal output) |
| Chân 3 | PA02 — GPIO / AIN0 / DAC / VOUT |
| Chân 4 | PA03 — GPIO / AIN1 / REF |
| Chân 5 | PA04 — GPIO / AIN2 |
| Chân 6 | PA05 — GPIO / AIN3 |
| Chân 7 | PA06 — GPIO / AIN4 |
| Chân 8 | PA07 — GPIO / AIN5 |
| Chân 9 | VDDIO — I/O supply voltage |
| Chân 10 | VSS — Digital ground |
| Chân 11 | PA08 — GPIO / AIN6 / SERCOM0 |
| Chân 12 | PA09 — GPIO / AIN7 / SERCOM0 |
| Chân 13 | PA10 — GPIO / AIN8 / SERCOM0 |
| Chân 14 | PA11 — GPIO / AIN9 / SERCOM0 |
| Chân 15 | PA12 — GPIO / SERCOM2 |
| Chân 16 | PA13 — GPIO / SERCOM2 |
| Chân 17 | PA14 — GPIO / SERCOM2 |
| Chân 18 | PA15 — GPIO / SERCOM2 |
| Chân 19 | PA16 — GPIO / SERCOM1 / I2S |
| Chân 20 | PA17 — GPIO / SERCOM1 / I2S |
| Chân 21 | PA18 — GPIO / SERCOM1 / I2S |
| Chân 22 | PA19 — GPIO / SERCOM1 / I2S |
| Chân 23 | PA20 — GPIO / SERCOM5 |
| Chân 24 | PA21 — GPIO / SERCOM5 |
| Chân 25 | PA22 — GPIO / SERCOM5 |
| Chân 26 | PA23 — GPIO / SERCOM5 |
| Chân 27 | PA24 — USB_DM (USB full-speed data minus) |
| Chân 28 | PA25 — USB_DP (USB full-speed data plus) |
| Chân 29 | PA27 — GPIO |
| Chân 30 | Reset — Reset input, active low |
| Chân 31 | PA28 — GPIO / SWDIO (Serial Wire Debug) |
| Chân 32 | PA30 — GPIO / SWCLK (Serial Wire Clock) |
| Chân 33 | PA31 — GPIO |
| Chân 34 | PB00 — GPIO |
| Chân 35 | PB01 — GPIO |
| Chân 36 | PB02 — GPIO / SERCOM5 / TC |
| Chân 37 | PB03 — GPIO / SERCOM5 |
| Chân 38 | PB04 — GPIO / SERCOM5 |
| Chân 39 | PB05 — GPIO / SERCOM5 |
| Chân 40 | PB06 — GPIO / SERCOM4 |
| Chân 41 | PB07 — GPIO / SERCOM4 |
| Chân 42 | PB08 — GPIO / SERCOM4 |
| Chân 43 | PB09 — GPIO / SERCOM4 |
| Chân 44 | PB10 — GPIO / SERCOM4 |
| Chân 45 | PB11 — GPIO / SERCOM4 |
| Chân 46 | PB12 — GPIO / SERCOM3 |
| Chân 47 | PB13 — GPIO / SERCOM3 |
| Chân 48 | PB14 — GPIO / SERCOM3 |
| Chân 49 | PB15 — GPIO / SERCOM3 |
| Chân 50 | PB16 — GPIO / SERCOM3 |
| Chân 51 | PB17 — GPIO / SERCOM3 |
| Chân 52 | PB18 — GPIO |
| Chân 53 | PB19 — GPIO |
| Chân 54 | PB20 — GPIO |
| Chân 55 | PB21 — GPIO |
| Chân 56 | PB22 — GPIO |
| Chân 57 | PB23 — GPIO |
| Chân 58 | PB24 — GPIO |
| Chân 59 | PB25 — GPIO |
| Chân 60 | PB26 — GPIO |
| Chân 61 | PB27 — GPIO |
| Chân 62 | PB28 — GPIO |
| Chân 63 | PB29 — GPIO |
| Chân 64 | PB30 — GPIO |
Ứng dụng tiêu biểu
ATSAMD21J15B-MUT phù hợp cho 6 Áp dụngs: IoT Sensor Node, USB HID Peripheral, Home Appliance White-Goods Controller, Industrial Sensor Interface Module, Battery-Powered Wearable Device, Low-Cost Custom Game Controller.
IoT Sensor Node
The ATSAMD21J15B-MUT's 48 MHz Cortex-M0+ core combined with 32 KB Flash and 4 KB SRAM delivers enough headroom for typical IoT sensor firmware including TLS stacks and radio drivers. Its integrated 12-bit ADC and Event System allow autonomous sensor sampling while the CPU remains asleep, dropping effective current consumption below 5 µA standby with RTC running. The wide 1.62 V to 3.63 V supply range suits coin-cell and lithium battery designs where voltage droop during discharge is unavoidable. Placed on a 2-layer board with proper decoupling, the 64-QFN exposed pad provides thermal dissipation for the event-driven workload typical of wireless sensor networks transmitting every few seconds.
Được đề xuất
USB HID Peripheral
The ATSAMD21J15B-MUT integrates a full-speed USB 2.0 transceiver with on-chip pull-up, eliminating the need for an external PHY in HID-class peripherals such as keyboards, mice, game controllers, and custom input devices. The 48 MHz CPU bandwidth supports USB polling plus HID report processing without stalling, while the six SERCOM channels provide expansion for wireless dongles or capacitive touch controllers. The 64-QFN package fits inside compact enclosures while leaving GPIO free for matrix scanning. Designers must implement USB suspend current (USB 2.0 spec 2.5 mA max) within the SAM D21's SleepWalking peripherals to maintain compliance when the host suspends the bus.
Được đề xuất
Home Appliance White-Goods Controller
The ATSAMD21J15B-MUT's Functional Safety (FuSa) features including the windowed watchdog timer, hardware CRC, and Memory Protection Unit support IEC 60730 Class B requirements for white-goods appliances such as washing machines, dishwashers, and induction cooktops. The 12-bit ADC handles temperature and current sensing, while the 10-bit DAC supports variable-speed motor drive references. The 32 KB Flash is more than adequate for typical Class B firmware with self-test routines, and the 64-QFN industrial temperature grade (-40 C to +85 C) tolerates appliance operating environments. Placed with isolated mains interface circuitry and BOD33 set to 2.6 V, the part provides a robust safety-certifiable MCU platform.
Được đề xuất
Industrial Sensor Interface Module
The ATSAMD21J15B-MUT's six SERCOM channels can be independently configured as UART, SPI, or I2C, providing flexible connectivity for multi-protocol industrial sensor aggregators interfacing Modbus RTU sensors over RS-485, SPI ADC channels, and I2C environmental sensors. The 12-bit ADC with 14 channels complements digital sensors with analog inputs from 4-20 mA current loops or thermocouples via an external amplifier. The 48 MHz headroom runs serial protocol stacks plus local filtering, while the industrial -40 C to +85 C temperature grade suits factory floor deployment. The 64-QFN package's exposed pad provides thermal dissipation for continuous UART reception workloads in PLC-style I/O modules.
Được đề xuất
Battery-Powered Wearable Device
The ATSAMD21J15B-MUT's 4 KB SRAM and 32 KB Flash are sufficient for wearable firmware managing BLE radio control, motion sensor fusion, and display updates from a coin-cell or rechargeable lithium battery. Sleep mode current of 5 µA with RTC allows multi-week standby, while active current of 3.5 mA at 48 MHz is reasonable for periodic sensor bursts. The six SERCOM channels support BLE modules (SPI), accelerometers (I2C), and display controllers (SPI). The compact 64-QFN (9x9) footprint fits inside wrist-worn enclosures, and the wide supply range down to 1.62 V supports battery end-of-life scenarios where the cell voltage drops to functional minimum.
Được đề xuất
Low-Cost Custom Game Controller
The ATSAMD21J15B-MUT provides enough horsepower to run USB HID class drivers for custom gamepads, arcade controllers, and macro pads with up to 51 GPIO pins in the 64-QFN package. Six SERCOM channels support external RGB LED controllers over SPI for status lighting, while the integrated USB 2.0 full-speed transceiver eliminates the need for an external bridge chip. The 32 KB Flash runs USB stack plus button matrix and light-effect firmware without code-size concerns. The 1.62 V to 3.63 V supply range allows USB bus-powered operation without external regulation, simplifying BOM and lowering assembly cost in budget gaming hardware.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD21J15B-MUT — 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 | ATSAMD21J15B-MU | ATSAMD21J15B-MFT | ATSAMD21J16B-MUT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - identical | 64-QFN (9x9 mm) - identical | 64-QFN (9x9 mm) - identical |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ - identical | ARM Cortex-M0+ - identical | ARM Cortex-M0+ - identical |
| Flash | 32 KB | 32 KB - identical | 32 KB - identical | 64 KB |
| SRAM | 4 KB | 4 KB - identical | 4 KB - identical | 8 KB |
| Max Frequency | 48 MHz | 48 MHz - identical | 48 MHz - identical | 48 MHz |
| Functional Safety (FuSa) | Yes | Yes | Yes | Yes |
| Packaging | Tape & Reel | Tray | Tape & Reel | Tape & Reel |
Bảo phân biệt quan trọng
- Functional Safety (FuSa) features in the B die revision (vsATSAMD21J15A-AF)
- Higher silicon revision fixes all A-revision errata (vsATSAMD21J15A-AF)
- Optimal balance of features for Class B applications (vsATSAMD21J15B-MU (Tray packaging))
Ghi chú thiết kế
Provide a clean 3.3 V supply rail to the ATSAMD21J15B-MUT with at least one 100 nF X7R ceramic decoupling capacitor placed within 5 mm of each VDD pin and a single 4.7 µF bulk capacitor on the main VDDIO net. Enable the internal BOD33 and set the threshold to the minimum acceptable VDD (typically 2.6 V for 3.3 V designs) so the part performs a clean reset on brown-out events. Estimated: at 48 MHz active current of ~3.5 mA, the bulk cap sustains ~1 ms of operation during a 10 ms supply collapse, sufficient for graceful shutdown.
Solder the exposed thermal pad (EP) of the 64-QFN package to a continuous ground plane with thermal vias for heat dissipation. The EP also provides the lowest-inductance ground reference for the device, so multiple stitched vias (typically 6 to 9) directly under the pad are recommended for EMC-sensitive applications. Estimated: at full 48 MHz active load, the SAM D21 dissipates ~115 mW; the 9x9 QFN EP layout keeps theta-JA below 30 C/W on a standard 2-layer 1-oz board.
Place the SWD header or Tag-Connect footprint within 50 mm of the SWDIO (PA28) and SWCLK (PA30) pins, with no series resistors in the debug path during development. Route the USB DP/DM pair (PA24/PA25) as a 90-ohm differential pair with a continuous ground reference on the adjacent layer; total length should not exceed 50 mm to avoid EMI issues. The 32.768 kHz RTC crystal should be placed within 5 mm of PA00/PA01 with short traces and a grounded guard ring to minimize stray capacitance.
Do not leave the NRST pin floating; a 10 kohm pull-up to VDDIO is mandatory. Ensure the BOOTPROT fuse is set to lock the bootloader section against accidental overwrite. Do not drive PA24/PA25 (USB pins) below 3.0 V when VDDIO is 3.3 V - the USB transceiver requires a minimum 3.0 V supply for compliance with USB 2.0 electrical specifications. Estimated: firmware boot takes ~3 ms with the standard 32 kHz crystal selection.
The six SERCOM channels can be assigned to almost any GPIO, but SERCOM0 is multiplexed on PA08-PA15 and SERCOM2 on PA12-PA15; avoid assigning two SERCOM channels to the same pins simultaneously. For designs using I2C with speeds above 400 kHz, add external 4.7 kohm pull-ups to VDDIO rather than relying solely on the internal 20-40 kohm weak pull-ups - the SAM D21 datasheet recommends external pull-ups for reliable Fast Mode Plus (1 MHz) operation.
Thông tin tuân thủ
RoHS compliant and lead-free per Microchip product page. The Functional Safety (FuSa) designation supports IEC 60730 Class B; not AEC-Q100 qualified for automotive applications.
