ATSAMD21J18A-AUT - 32-bit Cortex-M0+ MCU 256KB Flash 64-TQFP | Microchip
Référence : ATSAMD21J18A-AUT ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.2 | $4,20 |
| 10 | $3.78 | $37,80 |
| 100 | $3.35 | $335,00 |
| 500 | $2.98 | $1 490,00 |
| 1 000 | $2.63 | $2 630,00 |
ATSAMD21J18A-AUT Présentation
What is a Cortex-M0+ microcontroller? An MCU (microcontroller unit) is a single-chip computer integrating a CPU core, program memory (Flash), working memory (SRAM), and a rich set of peripherals. The ARM Cortex-M0+ is the most energy-efficient core in the Cortex-M family, optimized for low-power embedded designs. The ATSAMD21J18A-AUT sits in the power-management IC and microcontroller hierarchy as an industrial-grade general-purpose MCU suitable for home automation, consumer, metering, and industrial applications.
Key features of this part include a full-speed USB 2.0 device/host with on-chip transceiver, up to six SERCOM (serial communication) interfaces configurable as UART/SPI/I2C, a 12-bit 350 ksps ADC with up to 20 channels, two analog comparators, a 10-bit 350 ksps DAC, up to six 16-bit timer/counters, a 32-bit RTC, and a Peripheral Touch Controller (PTC) for capacitive touch sensing. The device operates from 1.62 V to 3.63 V and includes a built-in DMA controller, Event System, and SleepWalking peripherals for sub-microamp sleep current.
The ATSAMD21J18A-AUT uses a two-cycle pipeline Harvard architecture with single-cycle I/O access and a hardware multiplier, providing 0.9 DMIPS/MHz CoreMark performance. On-chip voltage regulation and an integrated POR/BOD circuit simplify power-tree design and reduce BOM count in 3.3 V systems.
Typical applications include IoT sensor nodes, USB HID devices, smart-home controllers, industrial HMI panels, and low-power wireless sensor hubs. The combination of USB, SERCOM, ADC, DAC, and touch sensing makes the part flexible for multi-protocol gateways. Designers should consult the device 40001882A datasheet for full peripheral mapping and the SAME70/SAM D21 Xplained Pro board schematics for reference designs.
Alternatives de remplacement direct pour ATSAMD21J18A-AUT — 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 ATSAMD21J18A-AUT (même facteur de forme et même empreinte) — différant par ADC, USB, Operating Temperature, DAC, Package.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATSAMD21J18A-AU
✅ Remplacement direct✓ En stock
$2.69 / unité
Voir la fiche technique →ATSAMD21J18A-AFT
✅ Remplacement direct✓ En stock
$2.71 / unité
Voir la fiche technique →ATSAMD21J18A-AF
✅ Remplacement direct✓ En stock
$2.99 / unité
Voir la fiche technique →ATSAMD21J17A-AUT
✅ Remplacement direct✓ En stock
$3.3 / unité
Voir la fiche technique →ATSAMD21J18A-AUT Valeurs maximales et caractéristiques électriques
| Core | ARM Cortex-M0+ (32-bit) |
| Max CPU Clock | 48 MHz |
| Program Memory (Flash) | 256 KB |
| SRAM | 32 KB |
| Operating Voltage (VDDIN) | 1.62 V to 3.63 V |
| I/O Voltage (VDDIO) | 1.62 V to 3.63 V |
| Boîtier | 64-pin TQFP (10x10 mm) |
| GPIO Count | 52 |
| ADC | 12-bit, up to 350 ksps, up to 20 channels |
| DAC | 10-bit, 350 ksps, 1 channel |
| Analog Comparators | 2 |
| SERCOM | 6 (each configurable as UART/SPI/I2C) |
| USB | USB 2.0 Full-Speed Device/Host with on-chip transceiver |
| Timers | 6 x 16-bit TC, 1 x 24-bit TCC, 1 x 32-bit RTC |
| PTC (Touch Controller) | Yes |
| DMA Channels | 12 |
| Température de fonctionnement | -40 C to +85 C (industrial, AUT grade) |
| Statut RoHS | Compliant |
| AEC-Q100 | Not qualified (AUT = tape & reel, not automotive grade) |
| Lead-Free / Halogen-Free | Yes (Green) |
Configuration des broches de ATSAMD21J18A-AUT
| Broche 1 | PB23 — GPIO PB23, SERCOM5/PTC |
| Broche 2 | PB22 — GPIO PB22, SERCOM5/PTC |
| Broche 3 | PA27 — GPIO PA27, GCLK input |
| Broche 4 | VBUS — USB VBUS sense input |
| Broche 5 | USB_DP — USB D+ line |
| Broche 6 | USB_DM — USB D- line |
| Broche 7 | XIN32 — 32.768 kHz crystal input |
| Broche 8 | XOUT32 — 32.768 kHz crystal output |
| Broche 9 | VDDIO — I/O supply voltage |
| Broche 10 | GND — Ground |
| Broche 11 | PA28 — GPIO PA28 |
| Broche 12 | PA30 — GPIO PA30, SWDIO |
| Broche 13 | PA31 — GPIO PA31, SWCLK |
| Broche 14 | PA15 — GPIO PA15, SERCOM3 |
| Broche 15 | PA16 — GPIO PA16, SERCOM3 |
| Broche 16 | PA17 — GPIO PA17, SERCOM3 |
| Broche 17 | PA18 — GPIO PA18, SERCOM3 |
| Broche 18 | PA19 — GPIO PA19, SERCOM3 |
| Broche 19 | PA20 — GPIO PA20, SERCOM5 |
| Broche 20 | PA21 — GPIO PA21, SERCOM5 |
| Broche 21 | PA22 — GPIO PA22, SERCOM3/I2C |
| Broche 22 | PA23 — GPIO PA23, SERCOM3/I2C |
| Broche 23 | PA24 — GPIO PA24, USB SOF |
| Broche 24 | USB_DP_2 — Reserved / NC depending on routing |
| Broche 25 | USB_DM_2 — Reserved / NC depending on routing |
| Broche 26 | GND — Ground |
| Broche 27 | VDDIO — I/O supply voltage |
| Broche 28 | VDDIN — Main regulator input |
| Broche 29 | PA25 — GPIO PA25, USB ID |
| Broche 30 | PB02 — GPIO PB02, ADC |
| Broche 31 | PB03 — GPIO PB03, ADC |
| Broche 32 | PB00 — GPIO PB00, ADC |
| Broche 33 | PB01 — GPIO PB01, ADC |
| Broche 34 | PB04 — GPIO PB04, ADC |
| Broche 35 | PB05 — GPIO PB05, ADC |
| Broche 36 | PB06 — GPIO PB06, ADC |
| Broche 37 | PB07 — GPIO PB07, ADC |
| Broche 38 | PB08 — GPIO PB08, ADC |
| Broche 39 | PB09 — GPIO PB09, ADC |
| Broche 40 | PA08 — GPIO PA08, ADC/PTC |
| Broche 41 | PA09 — GPIO PA09, ADC/PTC |
| Broche 42 | PA10 — GPIO PA10, ADC/PTC |
| Broche 43 | PA11 — GPIO PA11, ADC/PTC |
| Broche 44 | VDDANA — Analog supply voltage |
| Broche 45 | GND — Ground |
| Broche 46 | PA02 — GPIO PA02, DAC/VREFP |
| Broche 47 | PA03 — GPIO PA03, DAC/VREFN |
| Broche 48 | PA04 — GPIO PA04, AC0 |
| Broche 49 | PA05 — GPIO PA05, AC1 |
| Broche 50 | PA06 — GPIO PA06, AC2 |
| Broche 51 | PA07 — GPIO PA07, AC3 |
| Broche 52 | PB12 — GPIO PB12, SERCOM4 |
| Broche 53 | PB13 — GPIO PB13, SERCOM4 |
| Broche 54 | PB14 — GPIO PB14, SERCOM4 |
| Broche 55 | PB15 — GPIO PB15, SERCOM4 |
| Broche 56 | PA12 — GPIO PA12, SERCOM2 |
| Broche 57 | PA13 — GPIO PA13, SERCOM2 |
| Broche 58 | PA14 — GPIO PA14, SERCOM2 |
| Broche 59 | PB16 — GPIO PB16, SERCOM5 |
| Broche 60 | PB17 — GPIO PB17, SERCOM5 |
| Broche 61 | PB10 — GPIO PB10, SERCOM4 |
| Broche 62 | PB11 — GPIO PB11, SERCOM4 |
| Broche 63 | PA00 — GPIO PA00, XIN |
| Broche 64 | PA01 — GPIO PA01, XOUT |
Applications typiques
ATSAMD21J18A-AUT convient pour 7 applications: IoT Sensor Node / Smart Home Hub, USB HID / CDC Device, Industrial HMI / Control Panel, Capacitive Touch Control Interface, Portable Consumer Medical Devices, Smart Energy Meter / Sub-GHz Hub, Educational Maker Board / Arduino Compatible.
IoT Sensor Node / Smart Home Hub
The ATSAMD21J18A-AUT is well suited to IoT sensor nodes thanks to its 48 MHz Cortex-M0+ core, 256 KB Flash, and sub-microamp SleepWalking peripherals. Six SERCOM channels can simultaneously drive I2C sensors, an SPI radio module, and a UART debug console, while the 12-bit ADC reads up to 20 analog sensors. The 1.62-3.63 V operating range allows direct battery or energy-harvested supply. USB Full-Speed support enables easy firmware updates and CDC-ACM bridges to gateways.
Recommandé
USB HID / CDC Device
The ATSAMD21J18A-AUT's integrated USB 2.0 Full-Speed transceiver with on-chip pull-up simplifies HID peripherals, CDC-ACM bridges, and HID-input devices like keyboards and game controllers. The 48 MHz Cortex-M0+ executes USB stack callbacks with ample headroom, and the 12-channel DMA offloads bulk transfers. Designers benefit from Microchip's free ASF/Atmel Start USB stack, reducing firmware development time. The +85 C industrial rating supports kiosk and POS HID peripherals.
Recommandé
Industrial HMI / Control Panel
The ATSAMD21J18A-AUT fits industrial HMI panels with its 52 GPIO capable of driving keypads, character LCDs, and rotary encoders while still leaving pins for RS-485, Modbus, and CAN-style soft-links. The 12-bit ADC and two analog comparators handle sensor conditioning, and the 16-bit TC timers provide accurate PWM for backlight and motor control. Its 1.62-3.63 V range survives industrial 24 V step-down supply transients. Industrial-grade -40 C to +85 C operation ensures factory-floor reliability.
Recommandé
Capacitive Touch Control Interface
The ATSAMD21J18A-AUT integrates the Peripheral Touch Controller (PTC) supporting mutual- and self-capacitance sensing with hardware-driven scanning and noise-immunity algorithms. This enables robust touch buttons, sliders, and wheels for appliances and consumer electronics without an external touch IC. Combined with 256 KB Flash and the 12-bit ADC for proximity sensing, the part serves as a single-chip UI controller for induction cooktops, washing machines, and smart thermostats.
Recommandé
Portable Consumer Medical Devices
The ATSAMD21J18A-AUT supports battery-powered medical and wellness devices thanks to its low-power Run, Wait, and Sleep modes with sub-microamp RTC retention. The 12-bit 350 ksps ADC captures biosensor signals, while the DAC drives reference or stimulation waveforms. Six SERCOM ports communicate with BLE companions and OLED displays. The Cortex-M0+ integrates deterministic interrupt handling suitable for safety-critical wellness firmware. Note: this part is not AEC-Q100 or IEC 60730 qualified; for medical-grade designs add a separate safety MCU.
Recommandé
Smart Energy Meter / Sub-GHz Hub
The ATSAMD21J18A-AUT's Cortex-M0+ at 48 MHz provides enough throughput to run metering algorithms on sampled ADC streams while offloading sub-GHz radio control over SPI. Its 256 KB Flash fits the metering state machine plus TLS-friendly wireless stacks when paired with an external AT86RF215 or SAM R35 module. The 52 GPIO can drive metrology front ends, tamper-detection switches, and LCD segments directly. Industrial temperature range supports outdoor meter enclosures.
Recommandé
Educational Maker Board / Arduino Compatible
The ATSAMD21J18A-AUT is fully supported by the Arduino Zero bootloader and is widely used in maker and educational boards thanks to its 32-bit Cortex-M0+ performance and Atmel Studio / Arduino IDE tooling. The 64-pin TQFP gives students access to many peripherals in a breadboard-friendly footprint, and the integrated USB eliminates the need for an external programmer. Demos include motor control, audio synthesis, IoT nodes, and introductory RTOS labs with FreeRTOS SAM D21 ports.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATSAMD21J18A-AUT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATSAMD21J18A-AU | ATSAMD21J18A-AFT | ATSAMD21J18A-AF | ATSAMD21J17A-AUT |
|---|---|---|---|---|---|
| Package | TQFP-64 (10x10 mm) | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same | TQFP-64 - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash | 256 KB | 256 KB | 256 KB | 256 KB | 128 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C | -40 C to +125 C | -40 C to +85 C |
| Carrier Type | Tape & Reel | Tray | Tape & Reel | Tray | Tape & Reel |
| Max CPU Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| GPIO Count | 52 | 52 | 52 | 52 | 52 |
| Unit Price (1-pc) | $4.20 | ~$4.10 | ~$4.55 | ~$4.55 | ~$3.60 |
Principaux différenciateurs
- Highest GPIO count in the SAM D21 family (vs ATSAMD21G18A-AUT)
- On-chip Full-Speed USB with internal transceiver (vs ATSAMD20J18A-MN)
- Industrial +85 C grade in Tape & Reel (vs ATSAMD21J18A-AU)
Notes de conception
The ATSAMD21J18A-AUT contains an on-chip 1.2 V LDO that derives the core supply from VDDIN (1.62-3.63 V). Bypass VDDIN with 1 x 10 uF + 1 x 100 nF ceramic placed within 3 mm of the pin, and decouple each VDDIO/VDDANA pin with its own 100 nF cap. For USB applications, place a 10 uF cap on VBUS and a 0.1 uF cap on the 3.3 V rail derived from VBUS. Failure to decouple can result in USB enumeration failures and ADC noise coupling.
Route the USB DP/DM pair as a 90 ohm differential on the top layer with no splits and length-matched to within 150 mil. Keep the 32.768 kHz crystal traces short and surrounded by ground; place a guard ground ring around the crystal and its load caps. Avoid routing high-speed SERCOM SPI signals across the analog ADC inputs to minimize crosstalk in metering applications.
Do not assume all 52 GPIO are 5 V tolerant - all I/O are 3.3 V max regardless of supply. The SWDIO/SWCLK pins (PA30/PA31) must not be repurposed as outputs during reset or the debugger will lose contact; the BOOTPROT fuse disables SWD after lock. Use the Microchip Flash Security Bit to lock JTAG/SWD if your design ships outside the lab, but plan for field firmware update with a secure bootloader before locking.
At 48 MHz over 3.3 V the ATSAMD21J18A-AUT typically draws about 7 mA active and 7 uA in standby. Estimated: at 85 C ambient and a TQFP-64 theta_JA of about 60 C/W, internal dissipation never exceeds 30 mW even at full CPU load, so no heatsink is needed. For sealed enclosures with poor air flow verify temperature with a thermocouple on the package top in worst-case PWM and ADC sampling duty cycles.
Informations de conformité
AUT suffix = Tape & Reel industrial grade, not AEC-Q100. RoHS and REACH per Microchip product page.
