ATSAMD21J18A-CUT - 256KB Flash Cortex-M0+ MCU 64-BGA | Microchip
N.º de pieza: ATSAMD21J18A-CUT ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.73 | $4,73 |
| 10 | $4.26 | $42,60 |
| 100 | $3.78 | $378,00 |
| 500 | $3.4 | $1.700,00 |
| 1.000 | $3.02 | $3.020,00 |
ATSAMD21J18A-CUT Descripción general
A microcontroller (MCU) is an integrated circuit that combines a processor core, memory, and programmable peripherals on a single chip, forming the smallest complete compute platform in an embedded system. The Cortex-M0+ family sits at the most energy-efficient end of the ARM Cortex-M hierarchy, prioritizing low power and deterministic interrupt response over peak throughput. Microchip's SAM D21 family extends this with rich analog, USB, and capacitive touch peripherals, placing the SAM D21 in the broader taxonomy: ARM Cortex-M0+ -> Cortex-M -> 32-bit MCU -> microcontroller -> embedded processor -> semiconductor. It is pin-compatible with the SAM D20 family, enabling easy upgrades.
Key features include a 2.46 CoreMark/MHz performance figure, six SERCOM-configurable serial channels, an Event System for inter-peripheral signaling without CPU intervention, and a Peripheral Touch Controller supporting buttons, sliders, and wheels. The device provides 6 channel DMA, two I2S interfaces, and a built-in full-speed USB 2.0 device with on-chip transceiver, simplifying USB-connected designs.
Architecturally, the SAM D21 uses a single-cycle I/O port write architecture and an efficient bus matrix that allows simultaneous access to flash, SRAM, and peripherals. SleepWalking peripherals draw near-zero current while still being able to wake the core on events, and the Event System routes peripheral signals without CPU involvement. Six flexible SERCOM peripherals can each be independently configured as UART, SPI, or I2C, removing the need for fixed peripheral counts.
Typical applications include USB-enabled home automation nodes, consumer HID devices like keyboards and mice, industrial sensor hubs, smart energy metering, capacitive touch user interfaces, and wearable fitness trackers. The combination of low active power, deep-sleep modes below 1 µA, and integrated USB makes the ATSAMD21J18A a common choice for battery-powered connected devices.
When designing with this part, allocate adequate decoupling (100 nF per VDD pin plus a bulk 4.7 µF), route the USB D+/D- traces as a 90 Ω differential pair, and verify the chosen boot configuration matches your fuse settings. The 64-ball UFBGA requires PCB via-in-pad or careful escape routing; for prototypes, consider the QFN/64 variant instead.
This page synthesizes distributor pricing, same-brand pin-compatible variants, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para ATSAMD21J18A-CUT — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATSAMD21J18A-CUT (mismo factor de forma y huella) — difiere en Package, ADC, Operating Temperature, USB, SRAM.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATSAMD21J18A-CU
✅ Sustitución directa✓ En stock
$2.52 / unidad
Ver hoja de datos →ATSAMD21J17D-MU
✅ Sustitución directa✓ En stock
$2.21 / unidad
Ver hoja de datos →ATSAMD21J17A-MU
✅ Sustitución directa✓ En stock
$2.68 / unidad
Ver hoja de datos →ATSAMD21J16B-MU
✅ Sustitución directa✓ En stock
$2.18 / unidad
Ver hoja de datos →ATSAMD21J18A-CUT Valores máximos y características eléctricas
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Frequency | 48 MHz |
| Performance | 2.46 CoreMark/MHz |
| Flash Memory | 256 KB |
| SRAM | 32 KB |
| Supply Voltage Range | 1.6 V to 3.6 V |
| Temperatura de funcionamiento | -40C to +85C (CUT grade) |
| Encapsulado | 64-ball UFBGA |
| GPIO Count | Up to 48 |
| ADC | 12-bit, up to 350 ksps |
| DAC | 10-bit |
| SERCOM Channels | 6 (configurable as UART/SPI/I2C) |
| USB | USB 2.0 Full-Speed Device with on-chip transceiver |
| DMA Channels | 6 |
| I2S Channels | 2 |
| Peripheral Touch Controller | Yes (buttons, sliders, wheels) |
| Event System | Yes |
| Estado RoHS | Compliant |
Guía de configuración de pines de ATSAMD21J18A-CUT 64-ball ufbga
Configuración de pines para ATSAMD21J18A-CUT (encapsulado 64-ball ufbga). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para ATSAMD21J18A-CUT.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ATSAMD21J18A-CUT es adecuado para 7 aplicacións: USB-Connected Home Automation Hubs, Capacitive Touch User Interfaces, Industrial Sensor Hubs and Modbus Gateways, Wearable Fitness and Health Trackers, Smart Energy Meters and Sub-Metering, USB HID Consumer Devices (Keyboards, Mice, Remotes), IoT Sensor Edge Nodes with Event System.
USB-Connected Home Automation Hubs
The ATSAMD21J18A-CUT's integrated USB 2.0 Full-Speed device and Cortex-M0+ core make it a strong fit for USB-connected home automation hubs. With 256KB flash it can run Zigbee or Thread host stacks; the six SERCOMs handle UART/SPI sensor buses. Low-power SleepWalking extends battery life in wireless repeaters. Pin compatibility with SAM D20 family eases upgrades.
Recomendado
Capacitive Touch User Interfaces
The on-chip Peripheral Touch Controller of the ATSAMD21J18A-CUT supports buttons, sliders, and wheels using Microchip's QTouch library, eliminating an external touch IC. This saves BOM cost and PCB area in appliance control panels, smart locks, and audio interfaces. 256KB flash accommodates rich touch firmware with gesture recognition and proximity sensing.
Recomendado
Industrial Sensor Hubs and Modbus Gateways
Six configurable SERCOMs on the ATSAMD21J18A-CUT handle multiple UART, SPI, and I2C sensors simultaneously, ideal for industrial sensor hubs aggregating Modbus RTU, SPI ADC, and I2C sensor data. 48 MHz Cortex-M0+ delivers 2.46 CoreMark/MHz - enough for protocol conversion. The 1.6V-3.6V supply tolerates 3.3V industrial rails; -40C to +85C supports factory environments.
Recomendado
Wearable Fitness and Health Trackers
The ATSAMD21J18A-CUT's low active power and deep-sleep modes below 1 µA enable multi-day battery life in wearable fitness bands. The 12-bit ADC reads heart-rate and SpO2 analog front-ends; six SERCOMs connect to BLE modules, IMUs, and OLED displays. 32KB SRAM accommodates BLE stack and sensor fusion buffers. Small UFBGA-64 fits slim wristband form factors.
Recomendado
Smart Energy Meters and Sub-Metering
The ATSAMD21J18A-CUT's high-performance 12-bit ADC and six SERCOMs handle multi-phase current/voltage sensing, calibrated metering math, and communication to concentrators via UART or PLC. 256KB flash supports tamper detection and tariff logic. Hardware RTC with calendar and battery domain preserves timekeeping across power outages for billing accuracy.
Recomendado
USB HID Consumer Devices (Keyboards, Mice, Remotes)
The ATSAMD21J18A-CUT's on-chip USB 2.0 Full-Speed device removes the need for an external USB PHY in keyboards, mice, presentation remotes, and game controllers. The Peripheral Touch Controller handles capacitive scroll wheels and gesture pads. 256KB flash supports multi-protocol firmware (USB HID, BLE, RF); deep-sleep current is suitable for battery-powered remotes.
Recomendado
IoT Sensor Edge Nodes with Event System
The ATSAMD21J18A-CUT's Event System routes peripheral interrupts between ADC, timers, and DMA without CPU involvement, enabling ultra-low-power edge sensor nodes that wake only on relevant events. Six DMA channels offload ADC-to-memory transfers; the Cortex-M0+ runs at 48 MHz when active. 1.6V minimum supply allows direct Li-ion battery connection with simple regulation.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATSAMD21J18A-CUT — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATSAMD21J18A-CU | ATSAMD21J17D-MU | ATSAMD21J17A-MU | ATSAMD21J16B-MU | ATSAMD21J18A-AUT |
|---|---|---|---|---|---|---|
| Package | 64-ball UFBGA (CUT) | 64-ball UFBGA - same | 64-ball UFBGA - same | 64-ball UFBGA - same | 64-ball UFBGA - same | 64-pin TQFP - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 256 KB | 256 KB | 128 KB (-50%) | 128 KB (-50%) | 64 KB (-75%) | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 8 KB (-75%) | 32 KB |
| Core | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ |
| Max CPU Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| USB | USB 2.0 FS Device | USB 2.0 FS Device | USB 2.0 FS Device | No USB | USB 2.0 FS Device | USB 2.0 FS Device |
| SERCOM Channels | 6 | 6 | 6 | 6 | 6 | 6 |
| ADC | 12-bit, 350 ksps | 12-bit, 350 ksps | 12-bit, 350 ksps | 12-bit, 350 ksps | 12-bit, 350 ksps | 12-bit, 350 ksps |
Diferenciadores clave
- Higher flash density than lower-tier SAM D21 J-package parts (frente a ATSAMD21J16B-MU)
- USB 2.0 Full-Speed included vs J17A variant (frente a ATSAMD21J17A-MU)
- Same silicon in tape-and-reel vs tray packaging (frente a ATSAMD21J18A-CU)
Notas de diseño
Estimated: The 64-ball UFBGA (5x5 mm, 0.5 mm pitch) requires either via-in-pad or careful dog-bone fan-out routing. Place a 100 nF decoupling capacitor adjacent to every VDD pin and a single 4.7 uF bulk capacitor near the regulator output pin. Keep the USB D+/D- traces as a 90 ohm differential pair of equal length, with no stubs, and route them on the top layer beneath a continuous ground plane.
The ATSAMD21J18A-CUT operates from 1.6V to 3.6V. According to the SAM D21 datasheet, an integrated 1.2V LDO powers the core; an external 1 uF ceramic on VDDIN and a 1 uF on VDDANA are mandatory. For USB applications, ensure VDDUSB is supplied from the same 3.3V rail or driven by the internal regulator - consult the datasheet power supply section before finalizing the schematic.
Do not omit the 32.768 kHz crystal load capacitors - the SAM D21 internal load caps are configurable but factory-default zero. Pin 1 (PA00) doubles as XIN32, so any firmware that uses PA00 as GPIO must disable the RTC clock source first. Forgetting to clear the lock bits before mass production programming will brick the device; the NVM User Row must be configured for the chosen boot mode.
The USB D+/D- traces require 90 ohm differential impedance; a 90 ohm common-mode choke is recommended near the connector for ESD immunity. The 48 MHz CPU clock drives internal PLLs that can radiate harmonics - place the crystal close to the MCU with a continuous ground pour beneath and stitch vias around the perimeter to reduce EMI. Avoid routing the SWD lines (SWDIO, SWCLK) near the crystal or USB signals.
Información de cumplimiento
RoHS compliant per Microchip product page. The CUT grade is industrial temperature (-40C to +85C), not AEC-Q100 automotive grade. Microchip publishes Conflict Minerals Reporting Template (CMRT) and is DRC conflict-free.
