ATSAMD21J16B-MU - 64KB Flash Cortex-M0+ MCU | Microchip 64-QFN
MPN: ATSAMD21J16B-MU ✓ Hoạt độngATSAMD21J16B-MU Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), data memory (SRAM), and a rich set of peripherals such as timers, ADCs, communication interfaces, and GPIO. The ARM Cortex-M0+ is the smallest and most energy-efficient ARM processor core, designed for embedded applications that prioritize low power consumption and deterministic real-time response. Within the broader taxonomy, the SAM D21 sits at the intersection of MCU -> 32-bit MCU -> ARM Cortex-M MCU -> low-power MCU -> Microchip SAM D family, and the ATSAMD21J16B is the 64KB Flash variant within the SAM D21J 64-pin sub-family.
Key features include the Cortex-M0+ core delivering 2.46 CoreMark/MHz, full-speed USB 2.0 device/host support, a 12-bit 1 MSPS ADC, two I2C, up to six SERCOM (configurable serial communication), and advanced low-power Idle/Standby sleep modes with SleepWalking peripherals. The device also integrates a 12-channel DMAC, a 12-channel Event System, and a 48MHz DFLL locked to a 32.768kHz crystal for accurate USB timing. The 64-QFN package with EPAD provides a low-thermal-resistance path to the PCB copper pour, enabling sustained 48MHz operation in thermally constrained industrial enclosures.
The SAM D21 family is drop-in compatible with the SAM D20 family, simplifying migration from lower-pin-count or smaller-Flash designs. The 64KB Flash variant (J16) is positioned for cost-sensitive connected designs that need USB, more serial channels, or a richer analog front end than the J15 (32KB) variant. With its combination of low power, USB, and Cortex-M0+ performance, the ATSAMD21J16B-MU targets IoT sensor nodes, consumer USB peripherals, and industrial control modules.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD21J16B-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 ATSAMD21J16B-MU (cùng hình factor và footprint) — khác nhau ở Package, ADC, USB, Operating Temperature, DAC.
ATSAMD21J15B-MU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J17B-MU
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21J18B-MU
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD21J16B-MU Tỷ lệ tối đa & tính chất điện
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Frequency | 48 MHz |
| CoreMark/MHz | 2.46 CoreMark/MHz |
| Flash Memory | 64 KB |
| SRAM | 8 KB |
| Hộp | 64-QFN (9x9 mm) with EPAD |
| Operating Voltage (VDDIN) | 1.62 V to 3.63 V |
| Nhiệt độ hoạt động | -40C to +85C (industrial) |
| USB | USB 2.0 Full-Speed Device + Host |
| ADC | 12-bit, up to 1 MSPS, 20 channels |
| SERCOM | 6 configurable serial interfaces |
| DMAC Channels | 12 |
| Event System Channels | 12 |
| Timer/Counters (TC) | Multiple 16-bit and 8-bit TC |
| GPIO (max) | 52 |
| Debug Interface | Serial Wire Debug (SWD), 2-pin |
| Low-Power Modes | Idle, Standby, Backup, SleepWalking peripherals |
| Trạng thái RoHS | Compliant (Green) |
Cấu hình chân ATSAMD21J16B-MU
| Chân 1 | PA00 — GPIO / XIN32 (32.768kHz crystal input) |
| Chân 2 | PA01 — GPIO / XOUT32 (32.768kHz crystal output) |
| Chân 3 | PA02 — GPIO / AIN0 (ADC analog input 0) |
| Chân 4 | PA03 — GPIO / AIN1 / VREFA / REFADC |
| Chân 5 | GND — Ground |
| Chân 6 | VDD — Digital supply voltage (1.62V to 3.63V) |
| 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 / I2S SCK |
| Chân 12 | PA09 — GPIO / AIN7 / I2S FS |
| Chân 13 | PA10 — GPIO / AIN8 / I2S MCK |
| Chân 14 | PA11 — GPIO / AIN9 / I2S SDO |
| Chân 15 | VDDIO — I/O supply voltage |
| Chân 16 | GND — Ground |
| Chân 17 | PA12 — GPIO / AIN10 / SDI |
| Chân 18 | PA13 — GPIO / AIN11 / SDO |
| Chân 19 | PA14 — GPIO / AIN12 / SCK |
| Chân 20 | PA15 — GPIO / AIN13 / CS |
| Chân 21 | PA16 — GPIO / I2C SDA (SERCOM) |
| Chân 22 | PA17 — GPIO / I2C SCL (SERCOM) |
| Chân 23 | PA18 — GPIO / USB DM (USB D-) |
| Chân 24 | PA19 — GPIO / USB DP (USB D+) |
| Chân 25 | PA20 — GPIO / TCC0 |
| Chân 26 | PA21 — GPIO / TCC0 |
| Chân 27 | PA22 — GPIO / TCC0 |
| Chân 28 | PA23 — GPIO / TCC0 |
| Chân 29 | PA24 — GPIO / USB Host enable |
| Chân 30 | PA25 — GPIO / USB VBUS sense |
| Chân 31 | GND — Ground |
| Chân 32 | VDDIN — Voltage regulator input supply |
| Chân 33 | PA27 — GPIO |
| Chân 34 | PA28 — GPIO / RESET (alternate function) |
| Chân 35 | PA29 — GPIO / SWDIO |
| Chân 36 | PA30 — GPIO / SWCLK |
| Chân 37 | PA31 — GPIO |
| Chân 38 | PB00 — GPIO / AIN14 |
| Chân 39 | PB01 — GPIO / AIN15 |
| Chân 40 | PB02 — GPIO / AIN16 |
| Chân 41 | PB03 — GPIO / AIN17 |
| Chân 42 | PB04 — GPIO / AIN18 |
| Chân 43 | PB05 — GPIO / AIN19 |
| Chân 44 | PB06 — GPIO |
| Chân 45 | PB07 — GPIO |
| Chân 46 | PB08 — GPIO / I2C SDA (alt SERCOM) |
| Chân 47 | PB09 — GPIO / I2C SCL (alt SERCOM) |
| Chân 48 | PB10 — GPIO |
| Chân 49 | PB11 — GPIO |
| Chân 50 | PB12 — GPIO |
| Chân 51 | PB13 — GPIO |
| Chân 52 | PB14 — GPIO |
| Chân 53 | PB15 — GPIO |
| Chân 54 | PB16 — GPIO |
| Chân 55 | PB17 — GPIO |
| Chân 56 | PB18 — GPIO |
| Chân 57 | PB19 — GPIO |
| Chân 58 | PB20 — GPIO |
| Chân 59 | PB21 — GPIO |
| Chân 60 | PB22 — GPIO |
| Chân 61 | PB23 — GPIO |
| Chân 62 | PB24 — GPIO |
| Chân 63 | PB25 — GPIO |
| Chân 64 | EPAD — Exposed thermal pad - connect to GND |
Ứng dụng tiêu biểu
ATSAMD21J16B-MU phù hợp cho 7 Áp dụngs: USB HID Consumer Devices, Industrial Sensor Hubs, Battery-Powered IoT Nodes, Home Automation Controllers, Wearables and Fitness Devices, Automotive Body Electronics (Non-Safety), Smart Agriculture Sensor Nodes.
USB HID Consumer Devices
The ATSAMD21J16B-MU's integrated USB 2.0 Full-Speed controller with device and host modes makes it a strong fit for USB HID peripherals such as keyboards, mice, game controllers, and custom HID devices. The Cortex-M0+ core at 48MHz delivers enough throughput for complex HID descriptors and on-device firmware updates, while 64KB Flash accommodates USB stacks plus application code. The on-chip transceiver eliminates external USB PHY components, reducing BOM and PCB area, and the SERCOM peripherals provide flexible GPIO-to-USB bridging for legacy peripherals.
Được đề xuất
Industrial Sensor Hubs
The ATSAMD21J16B-MU's 12-bit 1 MSPS ADC with up to 20 channels, combined with 6 SERCOM interfaces and a 12-channel Event System, suits industrial sensor hub designs aggregating analog and digital sensors over I2C, SPI, and UART. The industrial -40C to +85C temperature rating supports factory-floor deployment. The 64KB Flash and 8KB SRAM are sufficient for Modbus or CANopen firmware stacks plus sensor calibration tables, and the Event System enables deterministic, low-latency sensor sampling without CPU intervention.
Được đề xuất
Battery-Powered IoT Nodes
The ATSAMD21J16B-MU's Idle, Standby, and Backup sleep modes plus SleepWalking peripherals enable multi-year battery life in IoT sensor nodes. The Event System can autonomously wake the ADC, compare a reading against a threshold, and only invoke the CPU when action is required, keeping average current in the single-digit microamp range. The 48MHz performance headroom supports burst-mode LoRa, BLE, or sub-GHz radio packet handling, while 64KB Flash accommodates OTA update staging buffers for future-proof firmware management.
Được đề xuất
Home Automation Controllers
The ATSAMD21J16B-MU integrates the peripherals needed for home automation gateways: USB for Wi-Fi/BLE module attachment, multiple SERCOM for sensor buses (I2C, SPI), timers for HVAC control loops, and ADC for analog sensor inputs. The 64-QFN (9x9 mm) package with EPAD allows compact gateway PCB layouts, and the 8KB SRAM comfortably supports small TCP/IP stacks over an external Wi-Fi module. Cortex-M0+ simplicity also keeps firmware development straightforward on the Microchip Studio/MPLAB X platform.
Được đề xuất
Wearables and Fitness Devices
The ATSAMD21J16B-MU's low-power Standby mode (single-digit microamp with RTC) combined with a 48MHz burst-mode Cortex-M0+ is well suited to battery-powered wearables such as fitness bands, heart-rate monitors, and BLE beacons. The 12-bit ADC supports bio-impedance and optical heart-rate sensor front ends, while SERCOM enables I2C/SPI connections to accelerometers and BLE modules. The 9x9 mm QFN footprint leaves room for small, curved wearable PCBs, and Microchip's ASF/START driver library accelerates time-to-market.
Được đề xuất
Automotive Body Electronics (Non-Safety)
The ATSAMD21J16B-MU's industrial -40C to +85C rating, CAN-friendly SERCOM (via external transceiver), and 64KB Flash suit non-safety automotive body applications such as HVAC controls, seat controllers, lighting modules, and infotainment secondary displays. The integrated USB enables media player and smartphone interface connectivity, while the Event System guarantees deterministic response times for body-control tasks. For ASIL-rated safety functions, designers should use Microchip's dedicated automotive-qualified SAM D20/D21 variants instead of the industrial-grade J16B-MU.
Được đề xuất
Smart Agriculture Sensor Nodes
The ATSAMD21J16B-MU combines low-power operation with sufficient peripherals for smart agriculture applications including soil moisture sensing, environmental monitoring, and irrigation valve control. The 12-bit ADC digitizes multiple analog sensors, the RTC with Standby mode enables scheduled wake cycles for years of battery life, and the SERCOM interfaces support LoRa, NB-IoT, or Sub-GHz radio modules for field-area-network connectivity. The wide operating temperature range supports harsh outdoor deployment in agricultural environments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD21J16B-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 | ATSAMD21J15B-MU | ATSAMD21J17B-MU | ATSAMD21J18B-MU |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum CPU Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 64 KB | 32 KB (-50%) | 128 KB (+100%) | 256 KB (+300%) |
| SRAM | 8 KB | 4 KB (-50%) | 16 KB (+100%) | 32 KB (+300%) |
| USB | USB 2.0 FS Device + Host | USB 2.0 FS Device + Host | USB 2.0 FS Device + Host | USB 2.0 FS Device + Host |
| ADC Resolution | 12-bit / 1 MSPS | 12-bit / 1 MSPS | 12-bit / 1 MSPS | 12-bit / 1 MSPS |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Bảo phân biệt quan trọng
- Balanced Flash/RAM in the SAM D21J family at lowest price point (vsATSAMD21J15B-MU)
- Half the Flash capacity of the J17, identical silicon for cost savings (vsATSAMD21J17B-MU)
- Industrial temperature rated, full SAM D21 feature set in 64-QFN (vsATSAMD20J16A-MU)
Ghi chú thiết kế
The SAM D21 family operates from a single 1.62V to 3.63V rail on VDDIN; the internal voltage regulator generates the 1.2V core supply from VDDIN. Place a 1uF X7R decoupling capacitor as close as possible to each VDD/VDDIO pin pair. For USB applications, VDDIN must be at least 3.0V for reliable USB signaling, and a 10uF bulk capacitor on VBUS is recommended when powering from USB. Avoid switching the main supply below the BOD threshold without proper reset handling.
The 64-QFN package with EPAD provides the primary heat-dissipation path; solder the EPAD to a continuous ground copper pour of at least 25 mm^2 for best thermal performance. At 48MHz the SAM D21 typically dissipates under 30 mW, so the EPAD copper is more for electrical grounding than thermal relief, but it must not be left floating - an ungrounded EPAD can cause latch-up and erratic behavior under temperature stress.
Place the 32.768kHz crystal and its load capacitors within 5 mm of the XIN32/XOUT32 pins (PA00/PA01). Use short, symmetric traces and a ground guard ring for low-jitter RTC operation. The DFLL48M locking to this crystal provides USB-accurate 48MHz; long, asymmetric traces will increase cycle-to-cycle jitter and degrade USB compliance margins. Keep the 32kHz traces away from switching signals and DC-DC inductors.
Do not confuse the SAM D21J16B-MU (industrial temp, 64-QFN, Green/RoHS-compliant) with the J16B-AU (64-TQFP) or the J16A revision (earlier silicon with errata). The 'B' revision is required for the latest USB and SERCOM fixes. Also note that the SAMD21 SERCOM peripheral requires explicit pin-mux configuration in firmware - the default port pin assignments are NOT the same as the GPIO port letter; consult the SAM D21 datasheet pin-mux tables before assigning I2C or SPI signals.
Thông tin tuân thủ
Green-compliant per Microchip product page; industrial temperature grade only (not AEC-Q100 qualified for automotive). Lead-free finish. RoHS and REACH compliant.
