ATSAMD21E18A-AFT - 48MHz Cortex-M0+ MCU, 256KB Flash | Microchip
N.º da peça: ATSAMD21E18A-AFT ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.4 | $340,00 |
| 500 | $3.05 | $1.525,00 |
| 1.000 | $2.72 | $2.720,00 |
ATSAMD21E18A-AFT Visão geral
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, memory, and programmable peripherals. The ARM Cortex-M0+ is the smallest and most energy-efficient ARM core, designed for deeply embedded applications where deterministic interrupt response, low active power, and a compact instruction set are critical. SAM D21 devices sit in the Cortex-M0+ family as low-power, high-performance variants and target USB-equipped and analog-rich designs.
Key features of the ATSAMD21E18A-AFT include the Cortex-M0+ core reaching 2.46 CoreMark/MHz, a 12-channel Event System, a full-speed USB 2.0 device with integrated transceiver, up to six SERCOM configurable serial interfaces (UART/SPI/I2C), a 12-bit ADC with up to 20 channels, two analog comparators, and a 16-bit timer/counter for control loops. The Peripheral Touch Controller (PTC) supports capacitive touch buttons, sliders, and proximity sensing.
The architecture pairs a single-cycle hardware multiplier with the Cortex-M0+ core, and the SAM D21 family shares a linear address map and hex-compatible code across pin counts, simplifying migration between 32-, 48-, and 64-pin members. The integrated Full-Speed USB transceiver eliminates the need for external crystal or pull-up resistors on most designs.
Typical applications include home automation nodes, smart metering, industrial sensor hubs, USB HID peripherals, wearable fitness bands, consumer appliances, and capacitive touch user interfaces. The wide 1.62V-3.63V supply range and low-power Sleep/Idle modes support battery-powered deployments.
When designing with this part, allocate the 32-pin TQFP footprint carefully because several peripheral functions share pins (the SERCOMs are highly multiplexed). For new designs, plan to use Atmel/Microchip START or MPLAB X with MCC to configure pin assignments and clock tree.
This page synthesizes current distributor pricing, drop-in alternatives, and practical design notes beyond what the manufacturer datasheet alone provides, enabling faster BOM decisions and supply-chain resilience.
Alternativas drop-in para ATSAMD21E18A-AFT — 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 ATSAMD21E18A-AFT (mesmo formato e footprint) — diferindo em Package, ADC, USB, MSL Level, Operating Temperature Range.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATSAMD21E17A-AF
✅ Drop-In✓ Em estoque
$2.34 / unidade
Ver ficha técnica →ATSAMD21E16A-AF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ATSAMD21E15A-AF
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ATSAMD21E17A-AU
✅ Drop-In✓ Em estoque
$2.3 / unidade
Ver ficha técnica →ATSAMD21E17A-MFT
✅ Drop-In✓ Em estoque
$2.55 / unidade
Ver ficha técnica →ATSAMD21E15B-AFT
✅ Drop-In✓ Em estoque
$1.96 / unidade
Ver ficha técnica →ATSAMD21E18A-AFT Classificações máximas e características elétricas
| Core | ARM Cortex-M0+ (32-bit) |
| Series | SAM D21E (Functional Safety / FuSa) |
| Maximum CPU Clock | 48 MHz |
| CoreMark Performance | 2.46 CoreMark/MHz |
| Flash Memory | 256 KB (256K x 8) |
| SRAM | 32 KB |
| Operating Voltage | 1.62 V to 3.63 V |
| Temperatura de operação | -40 C to +125 C |
| Encapsulamento | 32-TQFP (7x7 mm) |
| Tipo de montagem | Surface Mount (Tape & Reel) |
| USB | Full-Speed USB 2.0 Device with integrated transceiver |
| Serial Interfaces (SERCOM) | Up to 6 (configurable UART/SPI/I2C) |
| ADC | 12-bit, up to 20 channels |
| Analog Comparators | 2 |
| Timers | 16-bit TC modules and TCC for PWM |
| Touch Controller | Peripheral Touch Controller (PTC) - capacitive touch |
| Event System | 12-channel |
| Nível MSL | 3 |
| Status RoHS | Compliant |
Configuração de pinos do ATSAMD21E18A-AFT
| Pino 1 | PA00 — General-purpose I/O / SERCOM / ADC |
| Pino 2 | PA01 — General-purpose I/O / SERCOM / ADC |
| Pino 3 | PA02 — Analog comparator / ADC |
| Pino 4 | PA03 — Analog comparator / ADC / DAC |
| Pino 5 | PA04 — SERCOM / ADC |
| Pino 6 | PA05 — SERCOM / ADC |
| Pino 7 | PA06 — SERCOM / ADC |
| Pino 8 | PA07 — SERCOM / ADC |
| Pino 9 | VDDIO — Digital I/O supply (1.62-3.63V) |
| Pino 10 | GND — Common ground |
| Pino 11 | PA08 — SERCOM / NMI / pin X / pin 0 |
| Pino 12 | PA09 — SERCOM / pin 1 |
| Pino 13 | PA10 — SERCOM / pin 2 |
| Pino 14 | PA11 — SERCOM / pin 3 |
| Pino 15 | PA12 — SERCOM / pin 4 |
| Pino 16 | PA13 — SERCOM / pin 5 |
| Pino 17 | PA20 — USB D- |
| Pino 18 | PA21 — USB D+ |
| Pino 19 | PA22 — SERCOM / I2S SCK |
| Pino 20 | PA23 — SERCOM / I2S FS |
| Pino 21 | PA24 — SERCOM / USB ID |
| Pino 22 | PA25 — SERCOM / USB VBUS |
| Pino 23 | RESETN — Active-low reset input |
| Pino 24 | PA27 — SERCOM / pin 11 |
| Pino 25 | PA28 — SERCOM / pin 12 / Wake |
| Pino 26 | PA30 — SERCOM / SWCLK (programming) |
| Pino 27 | PA31 — SERCOM / SWDIO (programming) |
| Pino 28 | VDDANA — Analog supply (1.62-3.63V) |
| Pino 29 | GND — Common ground |
| Pino 30 | VBUS — USB VBUS detect (5V tolerant) |
| Pino 31 | XIN32 — 32.768 kHz crystal input |
| Pino 32 | XOUT32 — 32.768 kHz crystal output |
Aplicações típicas
ATSAMD21E18A-AFT é adequado para 6 aplicaçãos: Home Automation Hub, USB HID Peripheral (Keyboard/Mouse/HID Gamepad), Industrial Sensor Node / Smart Metering, Capacitive Touch User Interface, Wearable Fitness Band, Consumer Appliance Control Board.
Home Automation Hub
The ATSAMD21E18A-AFT fits home automation hubs because it combines 256 KB Flash for gateway stacks, the integrated Full-Speed USB device for wired upstream links, and 32 KB SRAM to buffer MQTT and Zigbee/BLE bridge messages. Its 1.62-3.63V supply range supports direct battery or 3.3V LDO rails, and the 48 MHz Cortex-M0+ core executes FreeRTOS task switches with deterministic latency. The 12-channel Event System lets sensor interrupts wake the MCU from Sleep without CPU overhead, extending coin-cell runtimes in wall-mounted switches and PIR motion nodes.
Recomendado
USB HID Peripheral (Keyboard/Mouse/HID Gamepad)
The ATSAMD21E18A-AFT integrates a Full-Speed USB 2.0 device with on-chip transceiver, so a USB HID keyboard, mouse, or gamepad needs no external PHY or precision pull-up. With 256 KB Flash it stores large HID descriptor sets and macro/mapping logic, while 32 KB SRAM handles USB endpoint buffering and key-scan queues. Up to six SERCOMs provide flexible SPI/I2C/UART connectivity to RGB LED drivers, NFC tags, or wireless modules.
Recomendado
Industrial Sensor Node / Smart Metering
The ATSAMD21E18A-AFT, an FuSa variant of the SAM D21E family, supports IEC 60730 Class B safety libraries for industrial sensor nodes and smart metering. Its 12-bit ADC with up to 20 channels reads thermistor, current-sense, and voltage-divider signals for energy measurement, while the two analog comparators handle zero-cross detection. The 1.62-3.63V range and 48 MHz core enable real-time power-quality calculations within sub-millisecond cycles.
Recomendado
Capacitive Touch User Interface
The ATSAMD21E18A-AFT integrates the Peripheral Touch Controller (PTC) which supports capacitive touch buttons, sliders, and proximity sensors without an external touch IC. The 256 KB Flash stores robust touch libraries, gesture recognition, and noise-immune scanning algorithms. Operating from 1.62-3.63V enables direct Li-ion or 3.3V supply to the touch panel in white goods and kitchen appliances.
Recomendado
Wearable Fitness Band
The ATSAMD21E18A-AFT targets wearable fitness bands where low Sleep current and a small 32-pin TQFP footprint matter most. Its Sleep/Idle modes below 10uA extend coin-cell battery life, while 256 KB Flash stores pedometer, heart-rate, and BLE protocol stack code. The 12-bit ADC reads Li-ion battery voltage and PPG signals, and integrated USB simplifies firmware updates or charging dock enumeration.
Recomendado
Consumer Appliance Control Board
The ATSAMD21E18A-AFT serves in consumer appliance control boards such as coffee machines, washing machines, and HVAC indoor units where Functional Safety libraries help meet IEC 60730 Class B. Up to six SERCOMs drive motor-control BLDC drivers via SPI, read encoders, and manage the user display. The 32-pin TQFP footprint fits compact control modules and the 125C operating temperature supports enclosed appliance environments.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATSAMD21E18A-AFT — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATSAMD21E17A-AF | ATSAMD21E16A-AF | ATSAMD21E15A-AF | ATSAMD21E17A-MFT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 32-TQFP (7x7 mm) | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same | 32-TQFP (7x7 mm) - same |
| Flash Memory | 256 KB | 128 KB (-50%) | 64 KB (-75%) | 32 KB (-87%) | 128 KB (-50%) |
| SRAM | 32 KB | 16 KB (-50%) | 8 KB (-75%) | 4 KB (-87%) | 16 KB (-50%) |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| 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 |
| Operating Temperature | -40 C to +125 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C |
| Functional Safety (FuSa) | Yes (SAM D21E variant) | No (SAM D21E non-FuSa) | No | No | No |
| USB FS Device | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) | Yes (integrated) |
| Approx. qty-1 Price (USD) | $4.20 | $3.50 | $3.10 | $2.80 | $3.65 |
Principais diferenciais
- Full 256 KB Flash in 32-pin TQFP, with FuSa libraries (vs ATSAMD21E17A-AF (128 KB Flash))
- Functional Safety (FuSa) variant for safety-class B appliances (vs ATSAMD21E17A-AF (non-FuSa SAM D21E))
- 125C operating temperature, full industrial range (vs ATSAMD21E17A-AF (-40 to +85C commercial grade))
Notas de projeto
Estimated: at 48 MHz full CPU load and 3.3V supply, the ATSAMD21E18A-AFT consumes roughly 12 mA active, dropping to single-digit uA in Sleep with RTC running. Decouple VDDIO and VDDANA separately with a 100nF ceramic capacitor within 2 mm of each pin; the ADC's reference and conversions are referenced to VDDANA and are sensitive to digital supply noise. Place a ferrite bead or 10 ohm resistor between VDDIO and VDDANA to keep digital switching out of the analog rail.
SAM D21 multiplexes multiple peripherals onto the same GPIO; mis-assigning PA20/PA21 (USB D-/D+) away from the integrated USB controller disables USB without a hardware error. Always confirm the SERCOM, USB, and PTC pin maps in the latest version of the SAM D21E datasheet pinout tables and the errata document, which lists which peripheral assignments are restricted on each silicon revision.
Route the 32.768 kHz crystal traces short and symmetrical with a guard-ring GND stitch. Place the crystal within 5 mm of XIN32/XOUT32 and keep high-speed signals (USB, SPI clock) at least 3 mm away. For USB, route D+/D- as a 90 ohm differential pair with no stubs and add ESD protection diodes directly at the connector to pass IEC 61000-4-2.
Estimated: at full CPU load on the 32-pin TQFP, total package dissipation is below 100 mW and junction rise over ambient stays well under 10 C for standard 1 oz copper pours. The 125C junction rating is comfortable for sealed enclosures; however, if you use the TQFP version inside a closed metal box without airflow, validate with a thermocouple rather than relying on nominal thermal resistance alone.
