ATSAMD21J16B-AFT - 64KB Flash ARM Cortex-M0+ MCU | Microchip
部品番号: ATSAMD21J16B-AFT ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $3.95 | $3.95 |
| 10 | $3.62 | $36.20 |
| 100 | $3.1 | $310.00 |
| 500 | $2.78 | $1,390.00 |
| 1,000 | $2.55 | $2,550.00 |
ATSAMD21J16B-AFT 概要
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.
ドロップイン代替品: ATSAMD21J16B-AFT — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ATSAMD21J16B-AFT （同一形状・フットプリント） — 相違点: ADC, Mounting Type, Package, Core, Operating Temperature.
クイック比較ツール — 並列比較する代替部品を選択:
ATSAMD21J17D-AFT
✅ ドロップイン✓ 在庫あり
$2.78 / 個
データシートを見る →ATSAMD21J18A-AFT
✅ ドロップイン✓ 在庫あり
$2.71 / 個
データシートを見る →ATSAMD21J15B-AFT
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ATSAMD20J18A-AU
✅ ドロップイン✓ 在庫あり
$2.15 / 個
データシートを見る →ATSAMD21J16B-AFT 最大定格＆電気的特性
| Core | ARM Cortex-M0+ (32-bit, single core) |
| CPU Clock Speed | 48 MHz |
| Program Memory (Flash) | 64 KB (64K x 8) |
| SRAM | 8 KB |
| パッケージ | 64-TQFP (10x10 mm) |
| Operating Voltage | 1.62 V to 3.63 V |
| Typical Operating Voltage | 3.3 V |
| Number of I/O | 52 |
| 動作温度範囲 | -40C to +125C |
| 実装タイプ | Surface Mount |
| Packaging | Tape & Reel |
| RoHS ステータス | 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) |
ATSAMD21J16B-AFT ピン構成
| ピン 1 | PA00 — GPIO / ADC input |
| ピン 2 | PA01 — GPIO / ADC input |
| ピン 3 | PA02 — GPIO / ADC / DAC output |
| ピン 4 | PA03 — GPIO / ADC / Reference voltage |
| ピン 5 | VDD — Digital supply voltage |
| ピン 6 | GND — Ground |
| ピン 7 | PA04 — GPIO / ADC / VDIV |
| ピン 8 | PA05 — GPIO / ADC |
| ピン 9 | PA06 — GPIO / ADC |
| ピン 10 | PA07 — GPIO / ADC |
| ピン 11 | VDDIO — I/O supply voltage |
| ピン 12 | GND — Ground |
| ピン 13 | PA08 — GPIO / NMI / ADC |
| ピン 14 | PA09 — GPIO / I2S / SERCOM |
| ピン 15 | PA10 — GPIO / SERCOM |
| ピン 16 | PA11 — GPIO / SERCOM |
| ピン 17 | PA12 — GPIO / SERCOM / COSC |
| ピン 18 | PA13 — GPIO / SERCOM |
| ピン 19 | PA14 — GPIO / SERCOM / XCLK |
| ピン 20 | PA15 — GPIO / SERCOM |
| ピン 21 | PA16 — GPIO / SERCOM / I2S |
| ピン 22 | PA17 — GPIO / SERCOM / SDO |
| ピン 23 | PA18 — GPIO / SERCOM |
| ピン 24 | PA19 — GPIO / SERCOM |
| ピン 25 | PA20 — GPIO / SERCOM |
| ピン 26 | PA21 — GPIO / SERCOM |
| ピン 27 | PA22 — GPIO / SERCOM |
| ピン 28 | PA23 — GPIO / SERCOM / USB SOF |
| ピン 29 | PA24 — GPIO / USB D- |
| ピン 30 | PA25 — GPIO / USB D+ |
| ピン 31 | GND — Ground |
| ピン 32 | VDD — Digital supply voltage |
| ピン 33 | PA26 — GPIO / SDC |
| ピン 34 | PA27 — GPIO / SDC |
| ピン 35 | PA28 — GPIO / Reset input |
| ピン 36 | PA29 — GPIO / SWD IO |
| ピン 37 | PA30 — GPIO / SWD CLK |
| ピン 38 | PA31 — GPIO |
| ピン 39 | PB00 — GPIO |
| ピン 40 | PB01 — GPIO |
| ピン 41 | PB02 — GPIO / SERCOM |
| ピン 42 | PB03 — GPIO / SERCOM |
| ピン 43 | PB04 — GPIO / SERCOM |
| ピン 44 | PB05 — GPIO / SERCOM |
| ピン 45 | PB06 — GPIO / SERCOM |
| ピン 46 | PB07 — GPIO / SERCOM |
| ピン 47 | PB08 — GPIO / SERCOM / I2S |
| ピン 48 | PB09 — GPIO / SERCOM / I2S |
| ピン 49 | PB10 — GPIO / SERCOM |
| ピン 50 | PB11 — GPIO / SERCOM |
| ピン 51 | PB12 — GPIO / SERCOM |
| ピン 52 | PB13 — GPIO / SERCOM |
| ピン 53 | PB14 — GPIO / SERCOM |
| ピン 54 | PB15 — GPIO / SERCOM |
| ピン 55 | PB16 — GPIO / SERCOM |
| ピン 56 | PB17 — GPIO / SERCOM / I2S MCLK |
| ピン 57 | PB18 — GPIO / TC |
| ピン 58 | PB19 — GPIO / TC |
| ピン 59 | PB20 — GPIO / TC |
| ピン 60 | PB21 — GPIO / TC |
| ピン 61 | VDD — Digital supply voltage |
| ピン 62 | GND — Ground |
| ピン 63 | VDDIO — I/O supply voltage |
| ピン 64 | GND — Ground |
主な用途
ATSAMD21J16B-AFT の用途: 6 件s: 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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
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.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ATSAMD21J16B-AFT — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | 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 |
主な差別化要因
- Full-speed USB 2.0 with on-chip pull-up and internal regulator （vs ATSAMD20J18A-AU)
- Higher GPIO count (52) on a single TQFP-64 footprint （vs ATSAMD21G18A-AFT)
- Industrial -40C to +125C operating temperature range （vs ATSAMD20J18A-AU)
設計ノート
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.
コンプライアンス情報
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.
