ATSAML21J18A-MUT - 48MHz Cortex-M0+ MCU, 256KB Flash | Microchip
N.º da peça: ATSAML21J18A-MUT ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $5.85 | $5,85 |
| 10 | $5.32 | $53,20 |
| 100 | $4.78 | $478,00 |
| 500 | $4.21 | $2.105,00 |
| 1.000 | $3.74 | $3.740,00 |
ATSAML21J18A-MUT Visão geral
What is a Cortex-M0+ microcontroller? A Cortex-M0+ microcontroller is an ARM Holdings 32-bit microcontroller core optimized for the smallest die area and lowest active power, using a 2-stage pipeline and single-cycle I/O port access. Within the hierarchy, the Cortex-M0+ belongs to the ARM Cortex-M family, itself a subset of the ARMv6-M architecture, and the SAM L21 family is Microchip's ultra-low-power derivative. This places the ATSAML21J18A-MUT in the broad category: microcontroller (MCU) -> 32-bit MCU -> ARM Cortex-M MCU -> ultra-low-power MCU -> semiconductor IC.
Key differentiating features include 1.6V to 3.6V supply voltage, integrated full-speed USB 2.0 device with on-chip transceiver, 12-bit 1 MSPS ADC, 10-bit 350 kSPS DAC, four SERCOM channels, six timers, two I2S interfaces, and a PTC (Peripheral Touch Controller) for capacitive touch sensing. The device operates in active, idle, standby, backup, and off sleep modes with wakeup times under 1.5 microseconds, making it ideal for battery-powered applications where microamp sleep currents dominate battery life.
Architecturally, the SAM L21 uses a power-efficient design with separate voltage domains for core and I/O, allowing the I/O bank to remain active while the core is in standby. This dual-bank approach, combined with Microchip's proprietary power-management IP, delivers 35 uA/MHz active current and standby currents around 1.7 uA with full RAM retention, which is competitive in the ultra-low-power MCU class.
Typical applications include battery-powered IoT sensor nodes, wearable fitness bands, smart-home sensor hubs, low-power wireless sensor networks, and capacitive touch human-machine interfaces. Industrial uses include metering, building automation, and remote controls; consumer uses include toys, gaming peripherals, and personal health devices.
Design consideration: when migrating from a SAM D21 part, note that the SAM L21 uses the same SERCOM peripheral but adds a low-power backup domain and a touch controller not present on the SAM D21. Firmware may need to enable the backup domain registers before using RTC or wake-on-touch features.
This page consolidates distributor pricing, drop-in alternatives within the SAM L21 family and across the SAM D21 family, and practical low-power design notes beyond the manufacturer datasheet.
Alternativas drop-in para ATSAML21J18A-MUT — 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 ATSAML21J18A-MUT (mesmo formato e footprint) — diferindo em ADC, DAC, Functional Safety, Package, Mounting Type.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ATSAML21J18B-AUT
✅ Drop-In✓ Em estoque
$4.55 / unidade
Ver ficha técnica →ATSAMD21J18A-MUT
✅ Drop-In✓ Em estoque
$3.27 / unidade
Ver ficha técnica →ATSAML21J18A-AUT
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ATSAML21J18B-MUT
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$4.68 / unidade
Ver ficha técnica →ATSAML21J17B-MUT
✅ Drop-In✓ Em estoque
$2.49 / unidade
Ver ficha técnica →ATSAML21J18A-MUT Classificações máximas e características elétricas
| Core | ARM Cortex-M0+ |
| Core Architecture | ARMv6-M |
| Maximum CPU Clock | 48 MHz |
| Flash Memory | 256 KB |
| SRAM | 32 KB |
| Supply Voltage Range | 1.62 V to 3.63 V |
| Encapsulamento | 64-QFN (9x9 mm) with exposed pad |
| Temperatura de operação | -40 C to +85 C |
| ADC | 12-bit, up to 1 MSPS |
| DAC | 10-bit, 350 kSPS |
| USB | USB 2.0 Full-Speed device, on-chip transceiver |
| SERCOM Channels | 6 (configurable as USART, I2C, SPI) |
| Timers | 6 (TC, TCC) |
| Touch Peripheral | PTC (Peripheral Touch Controller), up to 256 channels |
| I/O Pins | Up to 51 |
| Status RoHS | Compliant |
| Tipo de montagem | Surface Mount |
| Nível MSL | MSL3 |
| AEC-Q100 | Not qualified |
| Lead-Free / Halogen-Free | Lead-free; halogen-free status per datasheet |
Configuração de pinos do ATSAML21J18A-MUT
| Pino 1 | PA00 — GPIO / SERCOM1[0] / ADC[0] |
| Pino 2 | PA01 — GPIO / SERCOM1[1] / ADC[1] |
| Pino 3 | PA02 — GPIO / SERCOM0[0] / ADC[2] |
| Pino 4 | PA03 — GPIO / SERCOM0[1] / ADC[3] / reference |
| Pino 5 | GND — Ground |
| Pino 6 | VDDIO — I/O supply voltage |
| Pino 7 | PA04 — GPIO / SERCOM1[2] / ADC[4] |
| Pino 8 | PA05 — GPIO / SERCOM1[3] / ADC[5] |
| Pino 9 | PA06 — GPIO / SERCOM0[2] / ADC[6] |
| Pino 10 | PA07 — GPIO / SERCOM0[3] / ADC[7] |
| Pino 11 | PA08 — GPIO / SERCOM2[0] / I2S[0] |
| Pino 12 | PA09 — GPIO / SERCOM2[1] / I2S[1] |
| Pino 13 | PA10 — GPIO / SERCOM2[2] / I2S[2] |
| Pino 14 | PA11 — GPIO / SERCOM2[3] / I2S[3] |
| Pino 15 | PA12 — GPIO / SERCOM4[0] |
| Pino 16 | PA13 — GPIO / SERCOM4[1] |
| Pino 17 | PA14 — GPIO / SERCOM4[2] |
| Pino 18 | PA15 — GPIO / SERCOM4[3] |
| Pino 19 | PA16 — GPIO / SERCOM3[0] |
| Pino 20 | PA17 — GPIO / SERCOM3[1] |
| Pino 21 | PA18 — GPIO / SERCOM3[2] |
| Pino 22 | PA19 — GPIO / SERCOM3[3] |
| Pino 23 | PA20 — GPIO / SERCOM5[0] |
| Pino 24 | PA21 — GPIO / SERCOM5[1] |
| Pino 25 | PA22 — GPIO / SERCOM5[2] |
| Pino 26 | PA23 — GPIO / SERCOM5[3] |
| Pino 27 | PA24 — GPIO / SERCOM5[0] alt |
| Pino 28 | PA25 — GPIO / SERCOM5[1] alt |
| Pino 29 | PB00 — GPIO / SERCOM5[2] alt |
| Pino 30 | PB01 — GPIO / SERCOM5[3] alt |
| Pino 31 | PB02 — GPIO / SERCOM5[0] alt |
| Pino 32 | PB03 — GPIO / SERCOM5[1] alt |
| Pino 33 | PB04 — GPIO / SERCOM5[2] alt |
| Pino 34 | PB05 — GPIO / SERCOM5[3] alt |
| Pino 35 | PB06 — GPIO / SERCOM5[0] |
| Pino 36 | PB07 — GPIO / SERCOM5[1] |
| Pino 37 | PB08 — GPIO / SERCOM5[2] |
| Pino 38 | PB09 — GPIO / SERCOM5[3] |
| Pino 39 | PB10 — GPIO / SERCOM5[0] alt |
| Pino 40 | PB11 — GPIO / SERCOM5[1] alt |
| Pino 41 | PB12 — GPIO / SERCOM5[2] alt |
| Pino 42 | PB13 — GPIO / SERCOM5[3] alt |
| Pino 43 | PB14 — GPIO / SERCOM5[0] |
| Pino 44 | PB15 — GPIO / SERCOM5[1] |
| Pino 45 | PB16 — GPIO / SERCOM5[2] |
| Pino 46 | PB17 — GPIO / SERCOM5[3] |
| Pino 47 | PC00 — GPIO |
| Pino 48 | PC01 — GPIO |
| Pino 49 | PC02 — GPIO |
| Pino 50 | PC03 — GPIO |
| Pino 51 | PC04 — GPIO |
| Pino 52 | PC05 — GPIO |
| Pino 53 | PC06 — GPIO |
| Pino 54 | PC07 — GPIO |
| Pino 55 | VDDANA — Analog supply voltage |
| Pino 56 | GNDANA — Analog ground |
| Pino 57 | VDDIO — I/O supply voltage |
| Pino 58 | GND — Ground |
| Pino 59 | VSW — Buck/LDO switch node |
| Pino 60 | VBAT — Backup battery supply |
| Pino 61 | RESETn — Reset input, active low |
| Pino 62 | SWCLK — SWD clock |
| Pino 63 | SWDIO — SWD data |
| Pino 64 | NC — Not connected (per datasheet) |
Aplicações típicas
ATSAML21J18A-MUT é adequado para 7 aplicaçãos: Battery-Powered IoT Sensor Node, Wearable Fitness / Health Band, Smart Home Sensor Hub, Capacitive Touch User Interface, Industrial Metering Endpoints, Remote Control / Gaming Peripheral, USB-Powered Embedded Device.
Battery-Powered IoT Sensor Node
The ATSAML21J18A-MUT suits battery-powered IoT sensor nodes because of its 1.7 uA standby current with full RAM retention and 256 KB Flash for over-the-air (OTA) firmware updates. Its six SERCOM channels allow simultaneous SPI sensor, I2C sensor, and UART debug interfaces without external mux ICs. The 48 MHz Cortex-M0+ core handles sensor fusion at 100 Hz sample rates while consuming under 35 uA/MHz active. Powered from a CR2032 coin cell (3 V, 220 mAh), typical duty-cycled designs achieve 3-5 year battery life.
Recomendado
Wearable Fitness / Health Band
The ATSAML21J18A-MUT is well suited for wearable fitness bands due to its integrated 12-bit 1 MSPS ADC for heart-rate sensor signal acquisition, USB 2.0 Full-Speed for charging and data sync, and ultra-low standby current that preserves battery during idle wear periods. The integrated PTC touch controller supports swipe/tap input on flexible PCB overlays without mechanical buttons. The 64-QFN 9x9 mm package fits into 20 mm wide wristband modules, and 32 KB SRAM buffers 24 hours of step-count and accelerometer data.
Recomendado
Smart Home Sensor Hub
For smart-home sensor hubs, the ATSAML21J18A-MUT provides six SERCOM channels to connect multiple radios and sensors (Zigbee, BLE, temperature, humidity, motion), 256 KB Flash for protocol stack plus application logic, and a Cortex-M0+ core that runs BLE HCI or simple proprietary RF stacks. USB Full-Speed enables commissioning via a USB-C port. With 1.6 V to 3.6 V supply, the part runs directly from 2x AA alkaline batteries or from a USB 5 V rail through an LDO, simplifying BOM.
Recomendado
Capacitive Touch User Interface
The ATSAML21J18A-MUT's integrated Peripheral Touch Controller (PTC) supports up to 256 capacitive touch channels with hardware-driven acquisition, freeing the Cortex-M0+ core from polling overhead. This makes it ideal for appliance control panels, induction cooktops, and industrial HMI touchscreens. Combined with 256 KB Flash for touch firmware plus display drivers, and 1 MSPS ADC for backlight dimming, the part covers the entire HMI subsystem in a single QFN.
Recomendado
Industrial Metering Endpoints
The ATSAML21J18A-MUT fits battery-powered industrial metering endpoints (water, gas, electricity) that demand 10+ year battery life and remote firmware updates. Its 1.7 uA standby current minimizes quiescent drain, while 256 KB Flash accommodates segmented OTA bootloaders (application + dual-bank update image). The 12-bit ADC with internal reference meets metering accuracy class 1.0 in single-point calibration, and the USB port supports factory calibration and field diagnostics.
Recomendado
Remote Control / Gaming Peripheral
The ATSAML21J18A-MUT suits battery-powered remote controls and gaming peripherals due to its PTC for touch-sensitive surfaces, USB Full-Speed for wired connectivity when docked, and low active power allowing 100+ hours of continuous IR / Bluetooth operation from two AAA cells. The 32 KB SRAM handles HID report queues and on-the-fly macro programming. Microchip's MPLAB Harmony framework provides ready HID class drivers, shortening development cycles for consumer gaming accessories.
Recomendado
USB-Powered Embedded Device
The ATSAML21J18A-MUT integrates a USB 2.0 Full-Speed device controller with on-chip transceiver, eliminating the external PHY and reducing BOM cost for USB peripherals such as data loggers, programmers, and HID-class accessories. Operating from 1.62 V to 3.63 V, the device can run directly from USB VBUS through a 3.3 V LDO. The 256 KB Flash holds USB stacks plus application code, and the six SERCOM channels connect to sensors, displays, or storage.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ATSAML21J18A-MUT — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ATSAML21J18B-AUT | ATSAMD21J18A-MUT | ATSAML21J18A-AUT | ATSAML21J18B-MUT | ATSAML21J17B-MUT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9x9) | 64-QFN (9x9) | 64-QFN (9x9) | 64-QFN (9x9) | 64-QFN (9x9) | 64-QFN (9x9) |
| Core | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ | Cortex-M0+ |
| Maximum CPU Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 256 KB | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB |
| Supply Voltage Range | 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 |
| Touch Peripheral (PTC) | Yes (up to 256 channels) | Yes (up to 256 channels) | No PTC peripheral | Yes (up to 256 channels) | Yes (up to 256 channels) | Yes (up to 256 channels) |
| USB Full-Speed | Yes (on-chip transceiver) | Yes (on-chip transceiver) | Yes (on-chip transceiver) | Yes (on-chip transceiver) | Yes (on-chip transceiver) | Yes (on-chip transceiver) |
Principais diferenciais
- Integrated Peripheral Touch Controller (PTC) with up to 256 channels (vs ATSAMD21J18A-MUT)
- Lower standby current with full RAM retention (vs ATSAMD21J18A-MUT)
- Backup power domain with RTC (vs ATSAMD21J18A-MUT)
- Same 64-QFN footprint as ATSAMD21J18A-MUT for PCB reuse (vs ATSAMD21J18A-MUT)
Notas de projeto
To minimize standby current on the ATSAML21J18A-MUT, configure unused GPIO as analog (input disable, no pull-up) and disable unneeded peripherals via the PMUX / APBCMASK registers before entering STANDBY sleep mode. Per the SAM L21 datasheet, leaving a peripheral clock enabled can add 50-200 uA of leakage. For coin-cell designs, also route the VBAT pin to the same supply as VDD to avoid backup-domain switching transients during battery insertion.
Estimated: At maximum CPU load (48 MHz, all peripherals active), the ATSAML21J18A-MUT consumes approximately 35 uA/MHz x 48 MHz = 1.68 mA active current. With a 3.3 V supply, that is 5.5 mW power dissipation. The 64-QFN exposed pad should be soldered to a continuous ground copper pour at least 25 mm^2 to keep junction temperature rise below 5 C above ambient (theta_JA approximately 20-25 C/W on a 4-layer JEDEC test board). No external heatsink is required.
Place a 1 uF ceramic decoupling capacitor within 3 mm of each VDDIO pin and a 4.7 uF bulk capacitor near the exposed thermal pad for the ATSAML21J18A-MUT. According to the SAM L21 layout guidelines, separate analog and digital ground planes should be stitched together at a single point under the GNDANA pin. Route the SWD clock and data traces as a length-matched differential pair under 50 mm to avoid debugger communication errors at high debug clock rates.
A common pitfall when migrating firmware from ATSAMD21J18A to ATSAML21J18A-MUT is forgetting to enable the backup power domain in the SUPC (Supply Controller) register before configuring the RTC. The SAM D21 has no backup domain, so the SUPC register write sequence is new to SAM L21 code. If RTC alarms do not fire after sleep, check that SUPC was initialized correctly. Also, the SAM L21 ADC requires an extra channel-impedance calibration step at temperatures below -20 C.
Informações de conformidade
RoHS and lead-free compliant per Microchip product page. AEC-Q100 not qualified (industrial grade only); for automotive applications consider ATSAMxE variants. Halogen-free status not explicitly stated in retrieved data.
