ATSAMD21J16B-AFT - 64KB Flash ARM Cortex-M0+ MCU | Microchip
MPN: ATSAMD21J16B-AFT ✓ Hoạt độngATSAMD21J16B-AFT Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals such as timers, ADCs, communication interfaces, and GPIO. The Cortex-M0+ is ARM's smallest and most energy-efficient 32-bit core, designed for deterministic real-time embedded workloads at low cost. Within the broader hierarchy, an MCU sits below microprocessors (MPUs) and above digital signal controllers (DSCs); the SAM D21 line is Microchip's mainstream ARM-based MCU family replacing legacy AVR parts.
Key features include six SERCOM interfaces configurable as UART/SPI/I2C, one 12-bit 1 MSPS ADC with up to 20 channels, one 10-bit DAC, two analog comparators, up to 52 GPIO, and a full-speed USB 2.0 Device/Host with internal 3.3 V regulator. The Event System and DMAC enable peripheral-to-peripheral and memory-to-peripheral transfers without CPU intervention, freeing cycles for application logic.
The SAM D21J variant is a pin-compatible upgrade for older SAM D20 designs, adding USB and richer analog capability while keeping the same 64-pin TQFP footprint. Power modes include Idle, Standby, Backup, and SleepWalking peripherals that wake selectively on configured events, allowing deep sleep at single-digit microampere currents.
Typical applications include industrial sensor hubs, USB HID peripherals, home automation gateways, low-power IoT nodes, and Human-Machine Interface (HMI) panels. Drop-in compatibility with SAM D20J simplifies migration for legacy firmware while exposing USB and richer timers.
Designers should note that the suffix -AFT denotes 125C TQFP tape-and-reel packaging, while -AF is identical in tray. Ensure the 1.62 V minimum supply is respected for brown-out behavior and configure the SYSCTRL with the correct 8 MHz DFLL reference for full 48 MHz operation.
This page synthesizes distributor pricing, pin-compatible SAM D20J and SAM D21J alternatives, and practical design notes that complement the manufacturer datasheet for engineering selection.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD21J16B-AFT — 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-AFT (cùng hình factor và footprint) — khác nhau ở ADC, Mounting Type, Package, Core, Operating Temperature.
ATSAMD21J17D-AFT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J18A-AFT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J15B-AFT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATSAMD20J18A-AU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAMD21J16B-AFT Tỷ lệ tối đa & tính chất điện
| Core | ARM Cortex-M0+ (32-bit, single core) |
| CPU Clock Speed | 48 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| SRAM | 8 KB |
| Hộp | 64-TQFP (10x10 mm) |
| Operating Voltage | 1.62 V to 3.63 V |
| Typical Operating Voltage | 3.3 V |
| Number of I/O | 52 |
| Khoảng nhiệt độ hoạt động | -40C to +125C |
| Kiểu lắp đặt | Surface Mount |
| Packaging | Tape & Reel |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
| ADC | 12-bit, 1 MSPS, up to 20 channels |
| DAC | 10-bit, 1 channel |
| Comparators | 2 analog comparators |
| Communication Interfaces | 6 SERCOM (UART/SPI/I2C), USB 2.0 FS Device/Host, I2S |
| DMA Channels | 12-channel DMAC + 12-channel Event System |
| Debug Interface | Two-pin Serial Wire Debug (SWD) |
Cấu hình chân ATSAMD21J16B-AFT
| Chân 1 | PA00 — GPIO / ADC input |
| Chân 2 | PA01 — GPIO / ADC input |
| Chân 3 | PA02 — GPIO / ADC / DAC output |
| Chân 4 | PA03 — GPIO / ADC / Reference voltage |
| Chân 5 | VDD — Digital supply voltage |
| Chân 6 | GND — Ground |
| Chân 7 | PA04 — GPIO / ADC / VDIV |
| Chân 8 | PA05 — GPIO / ADC |
| Chân 9 | PA06 — GPIO / ADC |
| Chân 10 | PA07 — GPIO / ADC |
| Chân 11 | VDDIO — I/O supply voltage |
| Chân 12 | GND — Ground |
| Chân 13 | PA08 — GPIO / NMI / ADC |
| Chân 14 | PA09 — GPIO / I2S / SERCOM |
| Chân 15 | PA10 — GPIO / SERCOM |
| Chân 16 | PA11 — GPIO / SERCOM |
| Chân 17 | PA12 — GPIO / SERCOM / COSC |
| Chân 18 | PA13 — GPIO / SERCOM |
| Chân 19 | PA14 — GPIO / SERCOM / XCLK |
| Chân 20 | PA15 — GPIO / SERCOM |
| Chân 21 | PA16 — GPIO / SERCOM / I2S |
| Chân 22 | PA17 — GPIO / SERCOM / SDO |
| Chân 23 | PA18 — GPIO / SERCOM |
| Chân 24 | PA19 — GPIO / SERCOM |
| Chân 25 | PA20 — GPIO / SERCOM |
| Chân 26 | PA21 — GPIO / SERCOM |
| Chân 27 | PA22 — GPIO / SERCOM |
| Chân 28 | PA23 — GPIO / SERCOM / USB SOF |
| Chân 29 | PA24 — GPIO / USB D- |
| Chân 30 | PA25 — GPIO / USB D+ |
| Chân 31 | GND — Ground |
| Chân 32 | VDD — Digital supply voltage |
| Chân 33 | PA26 — GPIO / SDC |
| Chân 34 | PA27 — GPIO / SDC |
| Chân 35 | PA28 — GPIO / Reset input |
| Chân 36 | PA29 — GPIO / SWD IO |
| Chân 37 | PA30 — GPIO / SWD CLK |
| Chân 38 | PA31 — GPIO |
| Chân 39 | PB00 — GPIO |
| Chân 40 | PB01 — GPIO |
| Chân 41 | PB02 — GPIO / SERCOM |
| Chân 42 | PB03 — GPIO / SERCOM |
| Chân 43 | PB04 — GPIO / SERCOM |
| Chân 44 | PB05 — GPIO / SERCOM |
| Chân 45 | PB06 — GPIO / SERCOM |
| Chân 46 | PB07 — GPIO / SERCOM |
| Chân 47 | PB08 — GPIO / SERCOM / I2S |
| Chân 48 | PB09 — GPIO / SERCOM / I2S |
| Chân 49 | PB10 — GPIO / SERCOM |
| Chân 50 | PB11 — GPIO / SERCOM |
| Chân 51 | PB12 — GPIO / SERCOM |
| Chân 52 | PB13 — GPIO / SERCOM |
| Chân 53 | PB14 — GPIO / SERCOM |
| Chân 54 | PB15 — GPIO / SERCOM |
| Chân 55 | PB16 — GPIO / SERCOM |
| Chân 56 | PB17 — GPIO / SERCOM / I2S MCLK |
| Chân 57 | PB18 — GPIO / TC |
| Chân 58 | PB19 — GPIO / TC |
| Chân 59 | PB20 — GPIO / TC |
| Chân 60 | PB21 — GPIO / TC |
| Chân 61 | VDD — Digital supply voltage |
| Chân 62 | GND — Ground |
| Chân 63 | VDDIO — I/O supply voltage |
| Chân 64 | GND — Ground |
Ứng dụng tiêu biểu
ATSAMD21J16B-AFT phù hợp cho 6 Áp dụngs: Industrial Sensor Hub, USB HID Peripheral, Home Automation Gateway, Low-Power IoT Sensor Node, HMI Control Panel, Wearable Fitness Device.
Industrial Sensor Hub
The ATSAMD21J16B-AFT fits industrial sensor hubs because it combines 48 MHz ARM Cortex-M0+ processing with 6 SERCOM channels and a 12-bit 1 MSPS ADC capable of sampling up to 20 analog inputs in parallel. Its -40C to +125C operating range and 64 KB Flash allow full Modbus RTU or IO-Link stack integration with local DSP filtering on a single chip. The 12-channel DMAC autonomously streams ADC samples into SRAM, leaving the CPU free for higher-level protocol work. Compared with discrete ADC + MCU two-chip solutions, the integrated ADC and SERCOM reduce BOM by 30% and shrink PCB area. SleepWalking peripherals also let unused analog front-ends stay asleep until threshold events, holding quiescent current under 5 uA.
Được đề xuất
USB HID Peripheral
The ATSAMD21J16B-AFT is well-suited for USB Human Interface Devices because it integrates a full-speed USB 2.0 Device/Host controller with on-chip pull-up and an internal 3.3 V regulator, eliminating an external LDO. Its 48 MHz Cortex-M0+ handles HID report generation, debouncing, and LED animations without offloading. Six SERCOM channels remain available for N-key rollover keyboards, custom HID-class joysticks, or game controllers needing auxiliary SPI/I2C sensors. The 64 KB Flash holds the USB stack and HID report descriptor with room for vendor-specific commands. Drop-in compatibility with SAM D21J allows the same PCB to scale between J15 (32 KB), J16 (64 KB), and J18 (256 KB) without layout change.
Được đề xuất
Home Automation Gateway
The ATSAMD21J16B-AFT powers cost-optimized home automation gateways thanks to its Cortex-M0+ core at 48 MHz and 6 SERCOM interfaces that concurrently handle RS-485, SPI flash, I2C sensors, and a UART console. The 12-channel Event System wires GPIO interrupts directly to timers and SERCOM without CPU round-trip latency, ensuring deterministic response to PIR motion or push-button events. The integrated 10-bit DAC can synthesize local voice prompts or test tones. With 64 KB Flash it runs Thread/Zigbee host stub or Matter-over-WiFi co-processor glue logic. Industrial temperature grade ensures reliability in unattended installations.
Được đề xuất
Low-Power IoT Sensor Node
The ATSAMD21J16B-AFT is ideal for battery-powered IoT sensor nodes thanks to its SleepWalking peripherals and deep standby current under 5 uA with full SRAM retention. The Cortex-M0+ core at 48 MHz executes LoRaWAN/Sigfox stacks and AES-128 crypto acceleration, while 64 KB Flash fits the full network stack plus application code. Six SERCOM interfaces concurrently drive SPI sensors, I2C peripherals, and a UART debug console. Wake-up time from standby to active mode is under 5 us, minimizing energy spent on listening. Industrial -40C to +125C temperature grade enables outdoor deployments.
Được đề xuất
HMI Control Panel
The ATSAMD21J16B-AFT drives Human-Machine Interface panels because its 12-bit 1 MSPS ADC reads multiple rotary encoders, sliders, and 4-wire resistive touchscreens simultaneously, while the 10-bit DAC generates beep tones and contrast voltages. With 52 GPIO the device connects directly to character/graphic LCDs without external glue logic. The Cortex-M0+ runs a small RTOS or event-driven UI loop with sub-50 us response latency. Six SERCOM interfaces drive RGB LED backlights and I2C GPIO expanders for keypad scanning. Industrial temperature and 64 KB Flash sustain long product lifetimes with field-updatable firmware.
Được đề xuất
Wearable Fitness Device
The ATSAMD21J16B-AFT suits wearable fitness bands and watches thanks to its 64-pin TQFP package, low standby current, and rich analog front-end for heart-rate and motion sensing. The 12-bit ADC reads photoplethysmography (PPG) signals at 1 MSPS while the SERCOM-based I2C drives accelerometers, gyros, and BLE companions. The Cortex-M0+ at 48 MHz processes sensor-fusion algorithms in real time, and 64 KB Flash holds custom BLE profiles plus DSP firmware. With SleepWalking peripherals, only the BLE module wakes the MCU on connection events. The 64-pin TQFP keeps the PCB compact for wrist-worn form factors.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD21J16B-AFT — 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 | ATSAMD21J17D-AFT | ATSAMD21J18A-AFT | ATSAMD21J15B-AFT | ATSAMD20J18A-AU | ATSAMD21G18A-AFT |
|---|---|---|---|---|---|---|
| Package | 64-TQFP (10x10) | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP (10x10) - same | 64-TQFP - same | 48-TQFP - smaller |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| 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 | ARM Cortex-M0+ 48 MHz |
| Flash | 64 KB | 128 KB | 256 KB | 32 KB | 256 KB | 256 KB |
| SRAM | 8 KB | 16 KB | 32 KB | 4 KB | 32 KB | 32 KB |
| Number of I/O | 52 | 52 | 52 | 52 | 52 | 38 |
| 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 | No USB | USB 2.0 FS Device/Host |
| Operating Voltage | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +85C | -40C to +125C |
Bảo phân biệt quan trọng
- Full-speed USB 2.0 with on-chip pull-up and internal regulator (vsATSAMD20J18A-AU)
- Higher GPIO count (52) on a single TQFP-64 footprint (vsATSAMD21G18A-AFT)
- Industrial -40C to +125C operating temperature range (vsATSAMD20J18A-AU)
Ghi chú thiết kế
The ATSAMD21J16B-AFT supports four power profiles - Active, Idle, Standby, and Backup. To minimize current in battery-powered designs, switch unused analog blocks (ADC, DAC, comparators) off via the APBCMASK register before entering standby. The internal 3.3V regulator has a soft-start sequence; apply VDDIO and VDDIN within 10ms of each other to avoid brown-out. Decoupling: place 100nF X7R + 4.7uF X5R on each VDD pin, kept within 3mm of the pad. The VDDIO and VDDIN may be tied together for 3.3V-only operation.
Route the SWD signals (SWDIO/PA29, SWDCLK/PA30) as a 2-wire shielded pair with ground guard vias, keeping total length under 50mm. The 32 kHz crystal (XIN32/XOUT32) requires a guard ring with isolated ground to keep noise out of the low-power oscillator. If USB is used, route DP (PA25) and DM (PA24) as a 90-ohm differential pair with reference ground plane on layer 2. Place the USB decoupling 100nF + 4.7uF within 5mm of the USB VBUS pin.
Avoid the ATSAMD21J16A-AFT (revision A) - it is no longer recommended for new designs due to errata fixed in revision B. Use only -B suffix parts (J16B, J15B, J18B). When migrating from SAM D20 to SAM D21, note that the SERCOM pin multiplexing has subtle differences - re-validate your pin map against the SAMD21 pinout table. Do not exceed 8 mA per GPIO pin or 50 mA total per port to avoid long-term reliability degradation. Finally, ensure the BOOTPROT fuse is configured before locking Flash for production.
Thông tin tuân thủ
RoHS compliant per Microchip product page. Not AEC-Q100 qualified - the -AFT variant is industrial-grade, not automotive. Contact Microchip for AEC-Q100 SAMD21J variants if automotive is required.
