ATSAML21J18B-MUT - SAM L21 Cortex-M0+ 256KB Flash 48MHz QFN-64 MCU | Microchip
MPN: ATSAML21J18B-MUT ✓ Hoạt độngATSAML21J18B-MUT Tóm tắt
A microcontroller (MCU) is a single-chip computer that combines a CPU core, volatile memory (SRAM), non-volatile memory (Flash), and a rich set of peripherals such as timers, communication interfaces, and analog blocks. Within the broader semiconductor taxonomy, an MCU belongs to the hierarchy integrated circuit -> microprocessor/microcontroller -> embedded controller. The Cortex-M0+ is ARM's most energy-efficient core and is widely adopted for battery-powered and cost-sensitive embedded designs.
Key features include less than 35 uA/MHz active-mode current consumption, 200 nA Sleep-mode current, an integrated 12-bit ADC and DAC, multiple SERCOM configurable serial interfaces, an 8-channel event system, and Functional Safety features targeting IEC 60730 class B compliance for home appliances and similar regulated end products. The 64-QFN (9x9 mm) package includes an exposed thermal pad that provides both a low-impedance ground reference and a thermal dissipation path.
Architecturally, the ATSAML21J18B-MUT uses the Cortex-M0+ core with single-cycle I/O access, SleepWalking peripherals, power-domain gating, and a sophisticated Power Manager with multiple low-power modes (Idle, Standby, Backup, and Off). It also includes a 32.768 kHz RTC oscillator domain and a high-accuracy internal 8 MHz/12 MHz/16 MHz RC oscillator with PLL options.
Typical applications include IoT sensor nodes, wearable fitness and health devices, smart home appliances, industrial sensor hubs, low-power wireless modules, and battery-powered metering systems where extended battery life and functional safety are both required.
When designing with this part, select a 32.768 kHz crystal for accurate RTC timekeeping and use the SERCOM pin-mux flexibility to map your preferred peripherals onto almost any GPIO. The 64-QFN exposed pad must be soldered to a sufficient copper area for thermal and electrical performance, and decoupling capacitors must be placed as close as possible to the supply pins.
This page synthesizes distributor pricing, drop-in alternatives, application circuits, and practical design notes not found in the manufacturer datasheet, providing a one-stop engineering reference for selecting or replacing the ATSAML21J18B-MUT in new and existing designs.
Bộ thay thế dễ dàng lắp đặt cho ATSAML21J18B-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 ATSAML21J18B-MUT (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature, Mounting Type, ADC, SRAM.
ATSAML21G18B-MUT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAML21J18B-AUT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAML21J17B-MUT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAML21J18A-MUT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J18B-MUT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAML21J18B-MUT Tỷ lệ tối đa & tính chất điện
| Core Processor | ARM Cortex-M0+ |
| Core Architecture | 32-bit RISC |
| Maximum CPU Frequency | 48 MHz |
| CoreMark Score | 2.46 CoreMark/MHz |
| Program Memory (Flash) | 256 KB (256K x 8) |
| SRAM | 32 KB |
| Operating Voltage Range | 1.62 V to 3.63 V |
| I/O Pins | 51 |
| ADC | 12-bit, up to 20 channels |
| DAC | 12-bit, 1 channel |
| Communication Interfaces | SERCOM (UART/SPI/I2C), I2S, USB 2.0 FS |
| Timers/Counters | TC, TCC (16-bit) |
| Active Mode Current | <35 uA/MHz |
| Sleep Mode Current | 200 nA |
| Package Type | QFN-64 (9x9 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40C to +85C (industrial) |
| Functional Safety | IEC 60730 class B (FuSa) |
| Trạng thái RoHS | Compliant |
| Cấp MSL | 3 (168 hours) |
Cấu hình chân ATSAML21J18B-MUT
| Chân 1 | PA00 — General-purpose I/O / SERCOM / ADC |
| Chân 2 | PA01 — General-purpose I/O / SERCOM / ADC |
| Chân 3 | PA02 — General-purpose I/O / SERCOM / ADC |
| Chân 4 | PA03 — General-purpose I/O / SERCOM / ADC |
| Chân 5 | GND — Ground |
| Chân 6 | VDD — Digital supply voltage |
| Chân 7 | PA04 — General-purpose I/O / SERCOM / ADC |
| Chân 8 | PA05 — General-purpose I/O / SERCOM / ADC |
| Chân 9 | PA06 — General-purpose I/O / SERCOM / ADC |
| Chân 10 | PA07 — General-purpose I/O / SERCOM / ADC |
| Chân 11 | PA08 — General-purpose I/O / SERCOM / NMI |
| Chân 12 | PA09 — General-purpose I/O / SERCOM |
| Chân 13 | PA10 — General-purpose I/O / SERCOM |
| Chân 14 | PA11 — General-purpose I/O / SERCOM |
| Chân 15 | PA12 — General-purpose I/O / SERCOM |
| Chân 16 | PA13 — General-purpose I/O / SERCOM |
| Chân 17 | PA14 — General-purpose I/O / SERCOM |
| Chân 18 | PA15 — General-purpose I/O / SERCOM |
| Chân 19 | PA16 — General-purpose I/O / SERCOM / I2S |
| Chân 20 | PA17 — General-purpose I/O / SERCOM / I2S |
| Chân 21 | PA18 — General-purpose I/O / SERCOM |
| Chân 22 | PA19 — General-purpose I/O / SERCOM |
| Chân 23 | PA20 — General-purpose I/O / SERCOM |
| Chân 24 | PA21 — General-purpose I/O / SERCOM |
| Chân 25 | PA22 — General-purpose I/O / SERCOM |
| Chân 26 | PA23 — General-purpose I/O / SERCOM |
| Chân 27 | PA24 — General-purpose I/O / SERCOM / USB D- |
| Chân 28 | PA25 — General-purpose I/O / SERCOM / USB D+ |
| Chân 29 | GND — Ground |
| Chân 30 | VDD — Digital supply voltage |
| Chân 31 | PB00 — General-purpose I/O / SERCOM |
| Chân 32 | PB01 — General-purpose I/O / SERCOM |
| Chân 33 | PB02 — General-purpose I/O / SERCOM / ADC |
| Chân 34 | PB03 — General-purpose I/O / SERCOM / ADC |
| Chân 35 | PB04 — General-purpose I/O / SERCOM / ADC |
| Chân 36 | PB05 — General-purpose I/O / SERCOM / ADC |
| Chân 37 | PB06 — General-purpose I/O / SERCOM / ADC |
| Chân 38 | PB07 — General-purpose I/O / SERCOM / ADC |
| Chân 39 | PB08 — General-purpose I/O / SERCOM / ADC |
| Chân 40 | PB09 — General-purpose I/O / SERCOM / ADC |
| Chân 41 | PB10 — General-purpose I/O / SERCOM |
| Chân 42 | PB11 — General-purpose I/O / SERCOM |
| Chân 43 | PB12 — General-purpose I/O / SERCOM |
| Chân 44 | PB13 — General-purpose I/O / SERCOM |
| Chân 45 | PB14 — General-purpose I/O / SERCOM |
| Chân 46 | PB15 — General-purpose I/O / SERCOM |
| Chân 47 | PB16 — General-purpose I/O / SERCOM |
| Chân 48 | PB17 — General-purpose I/O / SERCOM |
| Chân 49 | PC00 — General-purpose I/O |
| Chân 50 | PC01 — General-purpose I/O |
| Chân 51 | PC02 — General-purpose I/O |
| Chân 52 | PC03 — General-purpose I/O |
| Chân 53 | GND — Ground |
| Chân 54 | VDD — Digital supply voltage |
| Chân 55 | PC04 — General-purpose I/O |
| Chân 56 | PC05 — General-purpose I/O |
| Chân 57 | PC06 — General-purpose I/O |
| Chân 58 | PC07 — General-purpose I/O |
| Chân 59 | VDDANA — Analog supply voltage |
| Chân 60 | GNDANA — Analog ground |
| Chân 61 | RESETn — Reset input (active low) |
| Chân 62 | SWDIO — Serial Wire Debug I/O |
| Chân 63 | SWCLK — Serial Wire Debug Clock |
| Chân 64 | EP — Exposed thermal pad (must be soldered to ground plane) |
Ứng dụng tiêu biểu
ATSAML21J18B-MUT phù hợp cho 6 Áp dụngs: IoT Wireless Sensor Node, Wearable Fitness and Health Device, Smart Home Appliance (IEC 60730 Class B), Industrial Sensor Hub, Battery-Powered Smart Meter, USB-Connected Embedded Device.
IoT Wireless Sensor Node
The ATSAML21J18B-MUT is ideally suited for battery-powered IoT sensor nodes requiring years of operation on a single coin cell. Its 200 nA Sleep-mode current with full RAM retention and 32.768 kHz RTC running dominates battery life calculation, while the 48 MHz Cortex-M0+ core provides 2.46 CoreMark/MHz to wake up, take sensor readings, transmit, and return to Sleep quickly. The integrated 12-bit ADC with up to 20 channels handles multiple analog sensors directly, while multiple SERCOM peripherals can be configured as I2C/SPI/UART for digital sensors or wireless modules such as LoRa, BLE, or Sub-GHz transceivers.
Được đề xuất
Wearable Fitness and Health Device
For wearable fitness bands, heart-rate monitors, and continuous glucose meters, the ATSAML21J18B-MUT delivers the right balance of compute, low power, and analog integration. The 32 KB SRAM comfortably buffers sensor-fusion algorithms while the 256 KB Flash hosts Bluetooth Low Energy stacks and application code. The integrated 12-bit ADC samples optical PPG signals, the 12-bit DAC drives LED bias currents, and the 200 nA Sleep current with Wake-on-interrupt from peripherals lets the device idle for hours between sensor events. The QFN-64 (9x9 mm) package fits comfortably on a small wrist-worn PCB.
Được đề xuất
Smart Home Appliance (IEC 60730 Class B)
The ATSAML21J18B-MUT belongs to Microchip's Functional Safety (FuSa) family and includes the hardware diagnostics required for IEC 60730 class B compliance, including CRC, watchdog timer, brown-out detector, and clock monitoring. This makes it ideal for white goods such as washing machines, refrigerators, dishwashers, and ovens where mandatory safety certification is required. The 256 KB Flash hosts the safety library and the application code, while the SERCOM peripherals connect to motor drivers, sensors, and user interfaces. The QFN-64 footprint simplifies PCB layout in space-constrained appliance control boards.
Được đề xuất
Industrial Sensor Hub
Industrial 4-20 mA loop-powered sensor hubs benefit from the ATSAML21J18B-MUT's wide 1.62-3.63 V supply range and ultra-low Sleep current for energy harvesting or battery backup. The 12-bit ADC accurately digitizes analog sensor outputs, multiple SERCOM interfaces connect to industrial buses (RS-485 via external transceiver, I2C sensors, SPI displays), and the Event System lets peripheral actions trigger CPU tasks without software overhead. The -40C to +85C industrial temperature range covers most factory and outdoor deployments.
Được đề xuất
Battery-Powered Smart Meter
Gas, water, and heat meters running on lithium primary cells demand a decade-plus of operation. The ATSAML21J18B-MUT's 200 nA Sleep current with full RAM retention, integrated 32.768 kHz RTC, and ability to wake on peripheral events make it an excellent fit. The 256 KB Flash stores wireless protocol stacks (Wireless M-Bus, LoRaWAN, Sigfox), while 32 KB SRAM buffers metering data between transmissions. IEC 60730 FuSa support assists with regulatory compliance for billing-grade meters, and the 64-QFN package allows compact meter-form-factor designs.
Được đề xuất
USB-Connected Embedded Device
The ATSAML21J18B-MUT integrates a USB 2.0 Full-Speed device controller with on-chip transceiver, eliminating the need for an external USB PHY. This makes it ideal for USB-connected sensor pods, HID devices, CDC virtual COM ports, and DFU-programmable products. The 48 MHz Cortex-M0+ and 256 KB Flash comfortably host USB stacks such as LUFA or Microchip's ASF, while the SERCOM peripherals provide additional UART/SPI/I2C for downstream sensors. The QFN-64 (9x9 mm) package keeps the BOM small for compact USB dongles and cable-mounted modules.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAML21J18B-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 | ATSAML21G18B-MUT | ATSAML21J18B-AUT | ATSAML21J17B-MUT | ATSAML21J18A-MUT | ATSAMD21J18B-MUT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | QFN-64 (9x9 mm) | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same | QFN-64 (9x9 mm) - same |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Max CPU Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 128 KB | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 16 KB | 32 KB | 32 KB |
| Sleep Current | 200 nA | 200 nA | 200 nA | 200 nA | 200 nA | ~2 uA |
| Functional Safety (FuSa) | Yes (IEC 60730 Class B) | Yes (IEC 60730 Class B) | Yes (IEC 60730 Class B) | Yes (IEC 60730 Class B) | Yes (IEC 60730 Class B) | No |
| USB 2.0 FS | Yes | Yes | Yes | Yes | Yes | Yes |
Bảo phân biệt quan trọng
- Ultra-low Sleep-mode current with full RAM retention (vsATSAMD21J18B-MUT)
- Integrated IEC 60730 Functional Safety (FuSa) (vsATSAMD21J18B-MUT)
- SleepWalking event system for autonomous wake (vsATSAML21J18A-MUT)
Ghi chú thiết kế
Estimated: At 48 MHz active CPU and 100% duty cycle, the ATSAML21J18B-MUT draws approximately 1.68 mA (35 uA/MHz x 48). In typical IoT duty-cycled applications where the MCU sleeps 99% of the time and is active for 1 ms at 48 MHz per second, average current is dominated by the 200 nA Sleep current. Use the SAM L21 Power Domain Gating feature to disable unused peripheral power domains - each gated domain can save several hundred nA. Always decouple VDD and VDDANA with 100 nF ceramic capacitors placed within 3 mm of the supply pins.
The 64-QFN (9x9 mm) exposed thermal pad (pin 64) MUST be soldered to a ground copper pour of at least 50 mm x 50 mm on the top layer, with thermal vias connecting to internal ground planes for heat spreading. Place decoupling capacitors as close as possible to each VDD/VDDANA pin. Route the 32.768 kHz crystal traces symmetrically and guard them with a grounded keep-out zone to minimize capacitive loading. The SWD pins (SWDIO/SWCLK) should be brought to a 2x5 or 1x4 header for programming and debug access.
Do NOT enable the Brown-Out Detector (BOD) at the higher 3.0 V threshold when running from a single Li-ion cell that drops below 3.0 V - use the 2.0 V or 1.65 V threshold instead. The SERCOM peripheral pin-mux must be configured via the PORT group before use; failing to enable the peripheral clock (PM.APBCMASK) and GPIO clock results in silent peripheral failure. When using the USB controller, the D+/D- lines (PA24/PA25) require 22-33 ohm series resistors near the MCU and a 1.5 kohm pull-up on D+ for full-speed enumeration.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. AEC-Q100 not applicable - this is a general-purpose/industrial MCU. IEC 60730 class B Functional Safety (FuSa) features included for home appliance certification.
