ATSAMD21J15B-MU - 32KB Flash Cortex-M0+ MCU | Microchip
部品番号: ATSAMD21J15B-MU ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $3.1 | $3.10 |
| 10 | $2.86 | $28.60 |
| 100 | $2.41 | $241.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.74 | $1,740.00 |
ATSAMD21J15B-MU 概要
A microcontroller (MCU) is a single-chip computer that combines a processor core, program memory (Flash), data memory (SRAM), and configurable peripherals on one die. Cortex-M0+ cores are the smallest, most energy-efficient members of the ARMv6-M family, positioned below Cortex-M4 in the ARM Cortex taxonomy (Cortex-M -> Cortex-M0/M0+ -> general-purpose MCU). MCUs hierarchically belong to: MCU -> microcontroller -> embedded processor -> semiconductor. The SAMD21J further extends this with Microchip's sleepwalking peripherals and SERCOM (Serial Communication Interface) modules that can run independently of the core.
Key features include up to six SERCOM interfaces for I2C/SPI/UART, a 12-bit 350 ksps ADC with up to 14 channels, a 10-bit 350 ksps DAC, three 24-bit timers/counters, two I2S interfaces, and a full-speed USB 2.0 device/host with on-chip transceiver. The device integrates a 48 MHz Digital Frequency Locked Loop (DFLL48M) and a 32.768 kHz low-power oscillator that can serve as reference for fractional PLLs (FDPLL) generating 48 MHz to 96 MHz. Power-on reset, brown-out detection, and an External Interrupt Controller with 16 channels and one non-maskable interrupt round out the housekeeping features.
Architecturally, the ATSAMD21J15B implements the Cortex-M0+ core with single-cycle multiplier, NVIC, and Microchip's standard SAM peripheral set including Event System for hardware-triggered peripheral-to-peripheral signaling without CPU intervention. The 32KB Flash variant is the smallest in the J-pin (64-pin) family, with code-compatible migration paths to J16/J17/J18 (64KB/128KB/256KB Flash). The 'B' silicon revision and 'F' revision designation denote incremental fixes that the SAM D21 family datasheet (DS40001882) documents.
Typical applications include IoT sensor nodes, USB HID/CDC devices, low-power wireless sensor hubs, industrial HMI panels, home automation controllers, and battery-powered wearables. The combination of Cortex-M0+ efficiency, USB, and rich analog makes the part especially attractive for any 64-pin industrial design that needs both USB device and precision ADC sampling in a single chip.
When designing with this part, choose the QFN package (-MU suffix) when PCB real-estate is critical and thermal performance via the exposed pad is acceptable; choose the TQFP (-AU) for hand-prototyping or where thermal vias or heat-sinking are impractical. Always enable the brown-out detector (BOD) at the lowest threshold the application tolerates and use the 32.768 kHz crystal with the FDPLL for jitter-sensitive USB or I2S streams.
This page synthesizes distributor pricing, parametric data, drop-in same-footprint alternatives, and design notes from the Microchip SAM D21/DA1 Family datasheet that are not assembled in one place in the manufacturer datasheet.
ドロップイン代替品: ATSAMD21J15B-MU — 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: ATSAMD21J15B-MU （同一形状・フットプリント） — 相違点: ADC, Package, USB, Operating Temperature, SRAM.
クイック比較ツール — 並列比較する代替部品を選択:
ATSAMD21J16B-MU
✅ ドロップイン✓ 在庫あり
$2.18 / 個
データシートを見る →ATSAMD21J17D-MU
✅ ドロップイン✓ 在庫あり
$2.21 / 個
データシートを見る →ATSAMD21J18A-MU
✅ ドロップイン📋 参考代替品（カタログ未掲載）
ATSAMD21J15B-MUT
✅ ドロップイン✓ 在庫あり
$1.92 / 個
データシートを見る →ATSAMD21J15B-MFT
✅ ドロップイン✓ 在庫あり
$2.39 / 個
データシートを見る →ATSAMD21J15B-MU 最大定格＆電気的特性
| Core | ARM Cortex-M0+ |
| Core Architecture | ARMv6-M, 32-bit |
| 最大クロック周波数 | 48 MHz |
| CoreMark/MHz | 2.46 |
| Flash Program Memory | 32 KB |
| SRAM | 4 KB |
| 電源電圧 | 1.62 V to 3.63 V |
| 動作温度 | -40 C to +85 C (industrial) |
| パッケージ | 64-pin QFN (9x9 mm) with exposed pad |
| ADC | 12-bit, up to 350 ksps, up to 14 channels |
| DAC | 10-bit, 350 ksps, 1 channel |
| SERCOM Modules | Up to 6 (configurable as I2C/SPI/UART) |
| USB | USB 2.0 Full-Speed Device/Host with on-chip transceiver |
| Timers/Counters | Three 24-bit TC, one 16-bit TCC |
| I2S | 2 interfaces |
| External Interrupts | 16 channels plus 1 NMI |
| Debug Interface | Two-pin Serial Wire Debug (SWD) |
| RoHS ステータス | Compliant |
ATSAMD21J15B-MU ピン構成
| ピン 1 | PA00 — GPIO / XIN32 (32.768 kHz crystal input) |
| ピン 2 | PA01 — GPIO / XOUT32 (32.768 kHz crystal output) |
| ピン 3 | PA02 — GPIO / ADC AIN0 / DAC VOUT |
| ピン 4 | PA03 — GPIO / ADC AIN1 / VREFA |
| ピン 5 | GND — Ground |
| ピン 6 | VDD — I/O supply voltage |
| ピン 7 | PA04 — GPIO / ADC AIN2 / TC0 WO0 |
| ピン 8 | PA05 — GPIO / ADC AIN3 / TC0 WO1 |
| ピン 9 | PA06 — GPIO / ADC AIN4 / TC1 WO0 |
| ピン 10 | PA07 — GPIO / ADC AIN5 / TC1 WO1 |
| ピン 11 | PA08 — GPIO / ADC AIN6 / TC2 WO0 |
| ピン 12 | PA09 — GPIO / ADC AIN7 / TC2 WO1 |
| ピン 13 | PA10 — GPIO / ADC AIN8 / TCC0 WO0 |
| ピン 14 | PA11 — GPIO / ADC AIN9 / TCC0 WO1 |
| ピン 15 | GND — Ground |
| ピン 16 | VDD — I/O supply voltage |
| ピン 17 | PA12 — GPIO / SERCOM2 PAD0 / I2S FS0 |
| ピン 18 | PA13 — GPIO / SERCOM2 PAD1 / I2S MCK0 |
| ピン 19 | PA14 — GPIO / SERCOM2 PAD2 / I2S SCK0 |
| ピン 20 | PA15 — GPIO / SERCOM2 PAD3 / I2S SD0 |
| ピン 21 | PA16 — GPIO / SERCOM1 PAD0 / I2S SD1 |
| ピン 22 | PA17 — GPIO / SERCOM1 PAD1 / I2S SCK1 |
| ピン 23 | PA18 — GPIO / SERCOM1 PAD2 |
| ピン 24 | PA19 — GPIO / SERCOM1 PAD3 |
| ピン 25 | PA20 — GPIO / SERCOM5 PAD2 / TCC1 WO2 |
| ピン 26 | PA21 — GPIO / SERCOM5 PAD3 / TCC1 WO3 |
| ピン 27 | PA22 — GPIO / SERCOM3 PAD0 / TCC0 WO2 |
| ピン 28 | PA23 — GPIO / SERCOM3 PAD1 / TCC0 WO3 |
| ピン 29 | PA24 — GPIO / USB DM |
| ピン 30 | PA25 — GPIO / USB DP |
| ピン 31 | GND — Ground (USB shield reference) |
| ピン 32 | VBUS — USB VBUS detect input |
| ピン 33 | PA27 — GPIO |
| ピン 34 | GND — Ground |
| ピン 35 | VDD — I/O supply voltage |
| ピン 36 | RESETN — Reset (active low) |
| ピン 37 | PA30 — GPIO / SWD clock input |
| ピン 38 | PA31 — GPIO / SWD data I/O |
| ピン 39 | PB00 — GPIO |
| ピン 40 | PB01 — GPIO |
| ピン 41 | PB02 — GPIO / SERCOM5 PAD0 / TCC1 WO0 |
| ピン 42 | PB03 — GPIO / SERCOM5 PAD1 / TCC1 WO1 |
| ピン 43 | PB04 — GPIO / SERCOM3 PAD2 |
| ピン 44 | PB05 — GPIO / SERCOM3 PAD3 |
| ピン 45 | PB06 — GPIO / SERCOM0 PAD0 |
| ピン 46 | PB07 — GPIO / SERCOM0 PAD1 |
| ピン 47 | PB08 — GPIO / SERCOM4 PAD0 / TC3 WO0 |
| ピン 48 | PB09 — GPIO / SERCOM4 PAD1 / TC3 WO1 |
| ピン 49 | PB10 — GPIO / SERCOM4 PAD2 / TCC0 WO4 |
| ピン 50 | PB11 — GPIO / SERCOM4 PAD3 / TCC0 WO5 |
| ピン 51 | PB12 — GPIO / SERCOM4 PAD0 alt / TC4 WO0 |
| ピン 52 | PB13 — GPIO / SERCOM4 PAD1 alt / TC4 WO1 |
| ピン 53 | PB14 — GPIO / SERCOM4 PAD2 alt / TC5 WO0 |
| ピン 54 | PB15 — GPIO / SERCOM4 PAD3 alt / TC5 WO1 |
| ピン 55 | PB16 — GPIO / SERCOM5 PAD2 alt / TCC1 WO2 alt |
| ピン 56 | PB17 — GPIO / SERCOM5 PAD3 alt / TCC1 WO3 alt |
| ピン 57 | PB18 — GPIO / SERCOM5 PAD0 alt |
| ピン 58 | PB19 — GPIO / SERCOM5 PAD1 alt |
| ピン 59 | PB20 — GPIO / SERCOM3 PAD2 alt |
| ピン 60 | PB21 — GPIO / SERCOM3 PAD3 alt |
| ピン 61 | GND — Ground (core) |
| ピン 62 | VDDCORE — Internal core voltage (decoupling only) |
| ピン 63 | VSW — Voltage switch output |
| ピン 64 | VDDIN — Voltage regulator input |
主な用途
ATSAMD21J15B-MU の用途: 6 件s: IoT Wireless Sensor Node, USB HID / CDC Device, Battery-Powered Wearable, Industrial HMI Control Panel, Smart Home Sensor Hub, Low-Cost Audio Playback Device.
IoT Wireless Sensor Node
The ATSAMD21J15B-MU fits IoT sensor hubs because its Cortex-M0+ core delivers 2.46 CoreMark/MHz while drawing only a few hundred microamps in active sleep mode. With 6 SERCOM channels, an SPI-connected radio (LoRa, Sub-GHz, or BLE module) can coexist with I2C sensors and a UART debug port. The 32 KB Flash is sufficient for over-the-air bootloader + application firmware. Power dissipation at 48 MHz / 3.3 V is roughly 7 mA active, enabling multi-year coin-cell operation when duty-cycled. The 12-bit ADC supports up to 14 channels for temperature, humidity, and motion sensing without an external mux.
おすすめ
USB HID / CDC Device
The ATSAMD21J15B-MU's on-chip full-speed USB 2.0 transceiver eliminates the external PHY typical of competing parts, reducing BOM cost and PCB area. The 48 MHz Cortex-M0+ core handles USB polling plus HID report generation, while 4 KB SRAM buffers HID reports without data loss. The device can be enumerated as HID Keyboard, HID Mouse, CDC Serial, or Vendor class. The 32 KB Flash is sufficient for the USB stack plus application logic in TinyUSB or ASF. The exposed pad on the QFN-64 keeps junction temperature manageable under continuous USB traffic.
おすすめ
Battery-Powered Wearable
The ATSAMD21J15B-MU is well-suited to wearables where Cortex-M0+ efficiency and SAM D21's sleep modes matter most. Sleep currents below 5 uA (deepest sleep with RTC running) extend battery life to weeks on a small Li-Po cell. The 12-bit ADC digitizes bioelectric signals (heart rate, galvanic skin response), and the 10-bit DAC drives a small audio cue or haptic waveform. The 64-pin QFN-64 (9x9 mm) is small enough for wristband PCBs. The integrated USB allows firmware updates and charging-logic communication without an extra chip.
おすすめ
Industrial HMI Control Panel
Industrial HMI panels benefit from the ATSAMD21J15B-MU's 14 ADC channels for reading analog sensors (pressure, flow, level), 6 SERCOM channels for multiple RS-485 / UART field-bus connections, and a deterministic 48 MHz Cortex-M0+ for scan loops. The -40 C to +85 C industrial temperature rating and brown-out detector suit factory-floor environments. The 32 KB Flash supports Modbus RTU stack plus a small LVGL or custom UI loop, while 4 KB SRAM holds framebuffer rows for a small graphic LCD.
おすすめ
Smart Home Sensor Hub
Smart-home sensor hubs combine Wi-Fi/BLE via an attached module, multiple wired sensors, and a control output (relay or triac). The ATSAMD21J15B-MU's 6 SERCOM channels can drive an SPI Wi-Fi module (e.g., ATWINC1500), a UART BLE module, and several I2C sensors (light, temperature, motion). The hardware Event System allows GPIO-triggered wake-ups without CPU intervention, reducing system latency. The 64-pin QFN exposes enough GPIO for relay drivers and rotary-encoder inputs typical of wall-mounted thermostats and security panels.
おすすめ
Low-Cost Audio Playback Device
I2S playback from a small Flash-based audio file is feasible on the ATSAMD21J15B-MU: the two I2S interfaces connect to an external DAC (e.g., PCM5102A) without glue logic. The 32 KB Flash can hold the application code while a serial Flash holds compressed audio samples. The 10-bit internal DAC is sufficient for low-fidelity tones or click-track generation. The 48 MHz Cortex-M0+ can decode ADPCM or basic WAV streams in real time at 16 kHz sample rate without glitching.
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: ATSAMD21J15B-MU — 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 | ATSAMD21J16B-MU | ATSAMD21J17D-MU | ATSAMD21J18A-MU | ATSAMD21J15B-MUT | ATSAMD21J15B-MFT |
|---|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum Clock Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash | 32 KB | 64 KB | 128 KB | 256 KB | 32 KB | 32 KB |
| SRAM | 4 KB | 8 KB | 16 KB | 32 KB | 4 KB | 4 KB |
| USB 2.0 Transceiver | Yes (on-chip) | Yes | Yes | Yes | Yes | Yes |
| SERCOM Modules | 6 | 6 | 6 | 6 | 6 | 6 |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C (AEC-Q100 qualified) |
主な差別化要因
- On-chip full-speed USB 2.0 transceiver （vs ATSAMD20J15A-MU)
- 6 SERCOM modules vs fixed peripheral pins （vs STM32L0x2 Cortex-M0+ parts)
- Event System for zero-CPU peripheral signaling （vs Generic Cortex-M0+ MCUs)
設計ノート
Estimated: at 48 MHz / 3.3 V the Cortex-M0+ core consumes about 7 mA active. Decoupling per the SAM D21/DA1 family datasheet: place a 100 nF X7R ceramic close to each VDD pin, plus a 4.7 uF bulk capacitor on the VDDIN pin. The internal voltage regulator (LDO) requires an external 1 uF on VDDCORE. Use the brown-out detector (BOD) with threshold 33 (3.3 V) to safely reset the MCU on supply dips.
The QFN-64 exposed thermal pad (EP) MUST be soldered to a copper pad of at least the same area as the EP itself, with thermal vias (typically 0.3 mm drill, 0.6 mm pitch, 9 vias) to an inner ground plane. The QFN-64 has 0.5 mm pitch pads - use NSMD (non-solder mask defined) pads with 0.27 mm width for reliable stencil printing. Keep high-speed signals (USB DP/DM) matched within 150 mils and route over a continuous ground reference.
Do not leave any GPIO floating - unused inputs must be configured as outputs or pulled to VDD/GND via internal pull-up/down to avoid shoot-through current. The 32.768 kHz crystal must have NPO dielectric load capacitors matched to its specified load (typically 7 pF or 12.5 pF). Do not exceed VDD = 3.63 V (the absolute maximum is 3.8 V). When using the FDPLL96M, configure the reference to be 32.768 kHz; do not feed it the 48 MHz DFLL output as the PLL reference.
コンプライアンス情報
RoHS and REACH compliant per Microchip product page. Industrial grade -40C to +85C. For automotive AEC-Q100 qualification, choose ATSAMD21J15B-MFT in the same QFN-64 footprint.
