ATSAMD21J15B-MU - 32KB Flash Cortex-M0+ MCU | Microchip
Référence : ATSAMD21J15B-MU ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 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 Présentation
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.
Alternatives de remplacement direct pour ATSAMD21J15B-MU — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATSAMD21J15B-MU (même facteur de forme et même empreinte) — différant par ADC, Package, USB, Operating Temperature, SRAM.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATSAMD21J16B-MU
✅ Remplacement direct✓ En stock
$2.18 / unité
Voir la fiche technique →ATSAMD21J17D-MU
✅ Remplacement direct✓ En stock
$2.21 / unité
Voir la fiche technique →ATSAMD21J18A-MU
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ATSAMD21J15B-MUT
✅ Remplacement direct✓ En stock
$1.92 / unité
Voir la fiche technique →ATSAMD21J15B-MFT
✅ Remplacement direct✓ En stock
$2.39 / unité
Voir la fiche technique →ATSAMD21J15B-MU Valeurs maximales et caractéristiques électriques
| Core | ARM Cortex-M0+ |
| Core Architecture | ARMv6-M, 32-bit |
| Fréquence d'horloge maximale | 48 MHz |
| CoreMark/MHz | 2.46 |
| Flash Program Memory | 32 KB |
| SRAM | 4 KB |
| Tension d'alimentation | 1.62 V to 3.63 V |
| Température de fonctionnement | -40 C to +85 C (industrial) |
| Boîtier | 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) |
| Statut RoHS | Compliant |
Configuration des broches de ATSAMD21J15B-MU
| Broche 1 | PA00 — GPIO / XIN32 (32.768 kHz crystal input) |
| Broche 2 | PA01 — GPIO / XOUT32 (32.768 kHz crystal output) |
| Broche 3 | PA02 — GPIO / ADC AIN0 / DAC VOUT |
| Broche 4 | PA03 — GPIO / ADC AIN1 / VREFA |
| Broche 5 | GND — Ground |
| Broche 6 | VDD — I/O supply voltage |
| Broche 7 | PA04 — GPIO / ADC AIN2 / TC0 WO0 |
| Broche 8 | PA05 — GPIO / ADC AIN3 / TC0 WO1 |
| Broche 9 | PA06 — GPIO / ADC AIN4 / TC1 WO0 |
| Broche 10 | PA07 — GPIO / ADC AIN5 / TC1 WO1 |
| Broche 11 | PA08 — GPIO / ADC AIN6 / TC2 WO0 |
| Broche 12 | PA09 — GPIO / ADC AIN7 / TC2 WO1 |
| Broche 13 | PA10 — GPIO / ADC AIN8 / TCC0 WO0 |
| Broche 14 | PA11 — GPIO / ADC AIN9 / TCC0 WO1 |
| Broche 15 | GND — Ground |
| Broche 16 | VDD — I/O supply voltage |
| Broche 17 | PA12 — GPIO / SERCOM2 PAD0 / I2S FS0 |
| Broche 18 | PA13 — GPIO / SERCOM2 PAD1 / I2S MCK0 |
| Broche 19 | PA14 — GPIO / SERCOM2 PAD2 / I2S SCK0 |
| Broche 20 | PA15 — GPIO / SERCOM2 PAD3 / I2S SD0 |
| Broche 21 | PA16 — GPIO / SERCOM1 PAD0 / I2S SD1 |
| Broche 22 | PA17 — GPIO / SERCOM1 PAD1 / I2S SCK1 |
| Broche 23 | PA18 — GPIO / SERCOM1 PAD2 |
| Broche 24 | PA19 — GPIO / SERCOM1 PAD3 |
| Broche 25 | PA20 — GPIO / SERCOM5 PAD2 / TCC1 WO2 |
| Broche 26 | PA21 — GPIO / SERCOM5 PAD3 / TCC1 WO3 |
| Broche 27 | PA22 — GPIO / SERCOM3 PAD0 / TCC0 WO2 |
| Broche 28 | PA23 — GPIO / SERCOM3 PAD1 / TCC0 WO3 |
| Broche 29 | PA24 — GPIO / USB DM |
| Broche 30 | PA25 — GPIO / USB DP |
| Broche 31 | GND — Ground (USB shield reference) |
| Broche 32 | VBUS — USB VBUS detect input |
| Broche 33 | PA27 — GPIO |
| Broche 34 | GND — Ground |
| Broche 35 | VDD — I/O supply voltage |
| Broche 36 | RESETN — Reset (active low) |
| Broche 37 | PA30 — GPIO / SWD clock input |
| Broche 38 | PA31 — GPIO / SWD data I/O |
| Broche 39 | PB00 — GPIO |
| Broche 40 | PB01 — GPIO |
| Broche 41 | PB02 — GPIO / SERCOM5 PAD0 / TCC1 WO0 |
| Broche 42 | PB03 — GPIO / SERCOM5 PAD1 / TCC1 WO1 |
| Broche 43 | PB04 — GPIO / SERCOM3 PAD2 |
| Broche 44 | PB05 — GPIO / SERCOM3 PAD3 |
| Broche 45 | PB06 — GPIO / SERCOM0 PAD0 |
| Broche 46 | PB07 — GPIO / SERCOM0 PAD1 |
| Broche 47 | PB08 — GPIO / SERCOM4 PAD0 / TC3 WO0 |
| Broche 48 | PB09 — GPIO / SERCOM4 PAD1 / TC3 WO1 |
| Broche 49 | PB10 — GPIO / SERCOM4 PAD2 / TCC0 WO4 |
| Broche 50 | PB11 — GPIO / SERCOM4 PAD3 / TCC0 WO5 |
| Broche 51 | PB12 — GPIO / SERCOM4 PAD0 alt / TC4 WO0 |
| Broche 52 | PB13 — GPIO / SERCOM4 PAD1 alt / TC4 WO1 |
| Broche 53 | PB14 — GPIO / SERCOM4 PAD2 alt / TC5 WO0 |
| Broche 54 | PB15 — GPIO / SERCOM4 PAD3 alt / TC5 WO1 |
| Broche 55 | PB16 — GPIO / SERCOM5 PAD2 alt / TCC1 WO2 alt |
| Broche 56 | PB17 — GPIO / SERCOM5 PAD3 alt / TCC1 WO3 alt |
| Broche 57 | PB18 — GPIO / SERCOM5 PAD0 alt |
| Broche 58 | PB19 — GPIO / SERCOM5 PAD1 alt |
| Broche 59 | PB20 — GPIO / SERCOM3 PAD2 alt |
| Broche 60 | PB21 — GPIO / SERCOM3 PAD3 alt |
| Broche 61 | GND — Ground (core) |
| Broche 62 | VDDCORE — Internal core voltage (decoupling only) |
| Broche 63 | VSW — Voltage switch output |
| Broche 64 | VDDIN — Voltage regulator input |
Applications typiques
ATSAMD21J15B-MU convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATSAMD21J15B-MU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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) |
Principaux différenciateurs
- 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)
Notes de conception
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.
Informations de conformité
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.
