ATSAMD21J18A-MF - 48MHz Cortex-M0+ MCU 256KB Flash | Microchip
N.º da peça: ATSAMD21J18A-MF ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $5.62 | $5,62 |
| 10 | $5.05 | $50,50 |
| 100 | $4.5 | $450,00 |
| 500 | $4.05 | $2.025,00 |
| 1.000 | $3.6 | $3.600,00 |
ATSAMD21J18A-MF Visão geral
A microcontroller (MCU) is an integrated circuit that combines a processor core, program and data memory, peripherals, and I/O on a single silicon die. The Cortex-M0+ is the most energy-efficient member of the ARM Cortex-M family, designed for deterministic real-time embedded workloads with a two-stage pipeline, single-cycle I/O port access, and an optional Micro Trace Buffer. SAM D21 microcontrollers extend the M0+ with Microchip's peripheral set, event system, and SleepWalking peripherals, positioning the family between 8-bit AVR/PIC parts and higher-cost Cortex-M4 parts.
Key features include 256 KB Flash, 32 KB SRAM, 48 MHz max CPU clock, a 12-bit 350 kSPS ADC with up to 20 channels, a 10-bit 350 kSPS DAC, six SERCOM modules configurable as UART/SPI/I2C, one full-speed USB 2.0 device/host port, up to 52 GPIO, and a 1.62-3.63 V operating voltage range. The device supports Sleep, Idle, Standby, and Backup sleep modes with typical active current around 3 mA at 48 MHz and standby currents in the single-digit microamp range.
The SAM D21 architecture pairs the Cortex-M0+ core with a 4-channel DMA controller, an Event System for inter-peripheral signalling without CPU intervention, and a SleepWalking power-management scheme that wakes selected peripherals only when matched events occur. Hardware math accelerators and CRC-32 reduce firmware overhead for sensor-fusion and packet-handling tasks. Debug is via SWD with an optional Micro Trace Buffer; programming is supported through Atmel-ICE, MPLAB X, and the Arduino IDE via the MKR/Zero board variants.
Typical applications include smart-home and home-automation hubs, low-power wireless sensor nodes, USB HID peripherals, battery-powered consumer devices, industrial metering, and motor-control front-ends. The wide 1.62-3.63 V supply range and integrated USB transceiver simplify lithium-battery designs with bus-powered accessories. AEC-Q100 variants are available in the SAM D21J family for automotive body and chassis applications.
When designing with this part, budget Flash and SRAM for bootloader + application coexistence and verify the 64-pin QFN PCB footprint against the manufacturer's land-pattern recommendation. Use the SERCOM multiplexing tables early in the pin-out assignment to avoid conflicting peripheral mappings.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives across the SAM D20/D21 families, and practical design notes not collated in the manufacturer datasheet, giving engineers a one-stop view for sourcing and substitution decisions.
Alternativas drop-in para ATSAMD21J18A-MF — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ATSAMD21J18A-MF (mesmo formato e footprint) — diferindo em Package, ADC, DAC, Operating Temperature, USB.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATSAMD21J18A-CU
✅ Drop-In✓ Em estoque
$2.52 / unidade
Ver ficha técnica →ATSAMD21J18A-AU
✅ Drop-In✓ Em estoque
$2.69 / unidade
Ver ficha técnica →ATSAMD21J18A-AUT
✅ Drop-In✓ Em estoque
$2.63 / unidade
Ver ficha técnica →ATSAMD21J18A-AF
✅ Drop-In✓ Em estoque
$2.99 / unidade
Ver ficha técnica →ATSAMD21J18A-MF Classificações máximas e características elétricas
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Frequency | 48 MHz |
| CoreMark/MHz | 2.46 |
| Program Flash | 256 KB |
| SRAM | 32 KB |
| Tensão de alimentação | 1.62 V to 3.63 V |
| Encapsulamento | 64-pin QFN (9x9 mm) |
| ADC | 12-bit, up to 20 channels, 350 kSPS |
| DAC | 10-bit, 350 kSPS |
| USB | USB 2.0 Full-Speed Device/Host |
| SERCOM | 6 (configurable UART/SPI/I2C) |
| GPIO | Up to 52 |
| Temperatura de operação | -40C to +125C |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
Configuração de pinos do ATSAMD21J18A-MF
| Pino 1 | PA00 — General-purpose I/O / XIN |
| Pino 2 | PA01 — General-purpose I/O / XOUT |
| Pino 3 | PA02 — General-purpose I/O / AIN[0] |
| Pino 4 | PA03 — General-purpose I/O / AIN[1] / VREFA |
| Pino 5 | GND — Ground |
| Pino 6 | VDDIN — Voltage regulator input |
| Pino 7 | VDDIO — I/O supply voltage |
| Pino 8 | PA04 — General-purpose I/O / AIN[2] |
| Pino 9 | PA05 — General-purpose I/O / AIN[3] |
| Pino 10 | PA06 — General-purpose I/O |
| Pino 11 | PA07 — General-purpose I/O |
| Pino 12 | PA08 — General-purpose I/O |
| Pino 13 | PA09 — General-purpose I/O |
| Pino 14 | PA10 — General-purpose I/O |
| Pino 15 | PA11 — General-purpose I/O / USB_DP |
| Pino 16 | PA12 — General-purpose I/O / USB_DM |
| Pino 17 | PA13 — General-purpose I/O |
| Pino 18 | PA14 — General-purpose I/O |
| Pino 19 | PA15 — General-purpose I/O |
| Pino 20 | PA16 — General-purpose I/O / I2S_SD[0] |
| Pino 21 | PA17 — General-purpose I/O / I2S_MCK[0] |
| Pino 22 | PA18 — General-purpose I/O / I2S_SCK[0] |
| Pino 23 | PA19 — General-purpose I/O / I2S_FS[0] |
| Pino 24 | PA20 — General-purpose I/O |
| Pino 25 | PA21 — General-purpose I/O |
| Pino 26 | PA22 — General-purpose I/O |
| Pino 27 | PA23 — General-purpose I/O / USB_ID |
| Pino 28 | PA24 — General-purpose I/O / USB_VBUS |
| Pino 29 | PA25 — General-purpose I/O |
| Pino 30 | GND — Ground |
| Pino 31 | VDDIO — I/O supply voltage |
| Pino 32 | PB00 — General-purpose I/O |
| Pino 33 | PB01 — General-purpose I/O |
| Pino 34 | PB02 — General-purpose I/O / AIN[10] |
| Pino 35 | PB03 — General-purpose I/O / AIN[11] |
| Pino 36 | PB04 — General-purpose I/O / AIN[12] |
| Pino 37 | PB05 — General-purpose I/O / AIN[13] |
| Pino 38 | PB06 — General-purpose I/O |
| Pino 39 | PB07 — General-purpose I/O |
| Pino 40 | PB08 — General-purpose I/O |
| Pino 41 | PB09 — General-purpose I/O |
| Pino 42 | PB10 — General-purpose I/O |
| Pino 43 | PB11 — General-purpose I/O |
| Pino 44 | PB12 — General-purpose I/O / I2S_SD[1] |
| Pino 45 | PB13 — General-purpose I/O / I2S_SCK[1] |
| Pino 46 | PB14 — General-purpose I/O / I2S_MCK[1] |
| Pino 47 | PB15 — General-purpose I/O / I2S_FS[1] |
| Pino 48 | PB16 — General-purpose I/O |
| Pino 49 | PB17 — General-purpose I/O |
| Pino 50 | PB18 — General-purpose I/O |
| Pino 51 | PB19 — General-purpose I/O |
| Pino 52 | PB20 — General-purpose I/O |
| Pino 53 | PB21 — General-purpose I/O |
| Pino 54 | PB22 — General-purpose I/O |
| Pino 55 | PB23 — General-purpose I/O |
| Pino 56 | PB24 — General-purpose I/O |
| Pino 57 | PB25 — General-purpose I/O / LED |
| Pino 58 | PB26 — General-purpose I/O |
| Pino 59 | PB27 — General-purpose I/O |
| Pino 60 | PB28 — General-purpose I/O |
| Pino 61 | PB29 — General-purpose I/O |
| Pino 62 | PB30 — General-purpose I/O / SWCLK |
| Pino 63 | PB31 — General-purpose I/O / SWDIO |
| Pino 64 | RESETn — Reset input (active low) |
Aplicações típicas
ATSAMD21J18A-MF é adequado para 6 aplicaçãos: Smart Home and Home Automation Hub, USB HID Peripheral Devices, Battery-Powered Consumer Electronics, Industrial Metering and Data Acquisition, Motor Control Front End, Wearable Fitness and Health Devices.
Smart Home and Home Automation Hub
The ATSAMD21J18A-MF's Cortex-M0+ core at 48 MHz, 256 KB Flash, and 32 KB SRAM make it a natural fit for smart-home hubs that aggregate Zigbee, BLE, and Wi-Fi endpoints. The 12-bit ADC with up to 20 channels handles multi-sensor input arrays for temperature, humidity, and occupancy sensing. Full-speed USB enables a bus-powered bridge to the gateway processor, while 6 SERCOMs manage concurrent SPI/I2C peripherals. According to Microchip application notes for home automation, the SAM D21's SleepWalking peripherals can wake the MCU only on matched events, allowing years of battery life on a CR2032 coin cell in sensor-leaf designs.
Recomendado
USB HID Peripheral Devices
Full-speed USB 2.0 Device/Host with on-chip transceiver eliminates the need for an external PHY, making the ATSAMD21J18A-MF ideal for USB HID peripherals such as keyboards, mice, game controllers, and custom input devices. The 256 KB Flash supports USB stacks plus HID descriptor tables and macro customization, while the 12-bit ADC can digitize analog joystick axes. The 48 MHz Cortex-M0+ delivers the throughput required for USB polling at 1 kHz with sub-1 ms interrupt latency. Microchip's USB stack and LUFA community stack both target this exact family, shortening firmware development cycles for HID products.
Recomendado
Battery-Powered Consumer Electronics
The 1.62-3.63 V supply range of the ATSAMD21J18A-MF directly supports single-cell lithium or alkaline battery packs without external level shifters. Sleep modes with single-digit microamp standby current, combined with SleepWalking peripherals that wake only on matched events, enable battery life measured in years for intermittently active products. The 10-bit DAC and 12-bit ADC simplify audio cue generation and battery voltage monitoring. Industrial-rated -40C to +125C operation supports outdoor and harsh-environment consumer gear such as wearables, e-bike accessories, and personal safety devices.
Recomendado
Industrial Metering and Data Acquisition
With a 12-bit 350 kSPS ADC, 6 configurable SERCOMs, and 52 GPIO, the ATSAMD21J18A-MF is well suited to industrial metering front-ends that combine analog signal conditioning with multi-bus communications. The 32 KB SRAM holds circular sample buffers for short-burst acquisition, while DMA-driven transfers free the Cortex-M0+ core for protocol handling on RS-485, SPI, or I2C. Operating range of -40C to +125C supports factory-floor deployment. The integrated event system routes ADC, timer, and GPIO signals between peripherals without CPU intervention, reducing latency for power-quality metering and motor-control feedback loops.
Recomendado
Motor Control Front End
The ATSAMD21J18A-MF's 48 MHz Cortex-M0+, 6 SERCOMs, and 12-bit ADC enable BLDC and stepper motor control front-ends with trapezoidal or sinusoidal commutation. Timer/Counter modules with PWM outputs drive FET gate drivers directly, while the event system synchronizes ADC sampling to PWM zero-crossings for back-EMF sensing. With 256 KB Flash available, vector control algorithms or simple FOC loops fit alongside communication stacks. Microchip's AN-CM-240 motor-control application notes and the Atmel-ICE debugger support the SAM D21 family out of the box.
Recomendado
Wearable Fitness and Health Devices
Low active current (~3 mA at 48 MHz), deep-sleep standby in the microamp range, and integrated 12-bit ADC make the ATSAMD21J18A-MF a strong fit for fitness bands, heart-rate monitors, and BLE-connected wearables. The 32 KB SRAM buffers sensor data between BLE transmissions, and SERCOMs talk to I2C heart-rate sensors and SPI accelerometers concurrently. Full-speed USB simplifies charging-crate data sync, while the 64-QFN 9x9 mm footprint fits small-form-factor wearable enclosures. Per Microchip low-power design guidance, average current under 100 uA is achievable for typical fitness-tracking duty cycles.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATSAMD21J18A-MF — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATSAMD21J18A-CU | ATSAMD21J18A-AU | ATSAMD21J18A-AUT | ATSAMD21G18A-MF | ATSAMD21E18A-MF |
|---|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-LQFP (10x10 mm) | 64-LQFP (10x10 mm) | 64-LQFP (10x10 mm) T&R | 48-QFN | 32-QFN |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| Maximum CPU Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| GPIO Count | 52 | 52 | 52 | 52 | 38 | 26 |
| Supply 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 +85C | -40C to +85C | -40C to +85C | -40C to +125C | -40C to +125C |
| USB Support | Full-Speed Device/Host | Full-Speed Device/Host | Full-Speed Device/Host | Full-Speed Device/Host | Full-Speed Device/Host | Full-Speed Device/Host |
Principais diferenciais
- Smallest footprint 64-pin SAM D21 variant (vs ATSAMD21J18A-AU (64-LQFP 10x10 mm))
- Higher GPIO count than smaller package variants (vs ATSAMD21G18A-MF (48-QFN))
- Extended industrial temperature range vs LQFP siblings (vs ATSAMD21J18A-AU (commercial 0-70C via 'A' suffix))
Notas de projeto
Decouple VDDIN with a 1 uF X7R ceramic close to the pin, and VDDIO with 100 nF + 4.7 uF bulk. The integrated voltage regulator requires VDDIN tied to VDDIO; a common mistake is leaving VDDIO unconnected, which prevents the core logic from powering up. Place the regulator output bypass capacitor within 2 mm of the IC per the SAM D21 hardware design checklist.
The 64-QFN exposed thermal pad (EP) must be soldered to the PCB ground plane through at least nine thermal vias in a 3x3 grid for thermal dissipation. Estimated: at 48 MHz with all peripherals active, the ATSAMD21J18A-MF draws ~3 mA at 3.3 V (about 10 mW), so a basic thermal via array is sufficient for industrial-temperature designs. Skipping the EP solder joint increases thermal resistance by 3-4x and risks latch-up during reflow.
Route USB DP and DM as a 90-ohm differential pair with matched length (delta < 2 mm) directly to the USB connector. Place the 22-ohm series termination resistors on DP and DM close to the MCU side. Keep the pair away from switching regulators and clock traces; Microchip USB design guidelines recommend a guard ground via fence on both sides of the differential pair.
Avoid common SERCOM pin-mux conflicts by reading the SAM D21 multiplexing tables before finalizing pin assignments - the SAME physical pin can map to multiple SERCOM instances and timer functions. Reset circuit: tie RESETn to VDDIO through a 10 kohm pull-up and 1 nF capacitor to ground; omitting the capacitor can leave the part in an indeterminate state at cold start below 0C.
Place the 32.768 kHz crystal as close as possible to pins PA00/XIN and PA01/XOUT with short, symmetric traces and a guard ground ring. Load capacitors (typical 12.5 pF) should be sized per the crystal manufacturer's CL specification, not chosen arbitrarily. For designs without an RTC crystal, PA00/PA01 can be repurposed as GPIO but disable the XOSC32K in software to save ~1 uA standby current.
Informações de conformidade
RoHS compliant per Microchip product page. AEC-Q100 qualification not applicable for the standard 'MF' industrial variant - select ATSAMC21J18A for AEC-Q100 automotive use. Conflict-minerals compliance per Microchip statement.
