ATSAMD21J18A-AUT - 32-bit Cortex-M0+ MCU 256KB Flash 64-TQFP | Microchip
MPN: ATSAMD21J18A-AUT ✓ فعالATSAMD21J18A-AUT نمای کلی
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.
جایگزین‌های drop-in برای ATSAMD21J18A-AUT — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای ATSAMD21J18A-AUT (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در ADC, USB, Operating Temperature, DAC, Package.
ATSAMD21J18A-AU
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATSAMD21J18A-AFT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATSAMD21J18A-AF
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATSAMD21J17A-AUT
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ATSAMD21J18A-AUT حداکثر مقادیر مجاز و مشخصات الکتریکی
| 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 |
| بسته‌بندی | 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 |
| دمای کاری | -40 C to +85 C (industrial, AUT grade) |
| وضعیت RoHS | Compliant |
| AEC-Q100 | Not qualified (AUT = tape & reel, not automotive grade) |
| Lead-Free / Halogen-Free | Yes (Green) |
پیکربندی پین ATSAMD21J18A-AUT
| پین 1 | PB23 — GPIO PB23, SERCOM5/PTC |
| پین 2 | PB22 — GPIO PB22, SERCOM5/PTC |
| پین 3 | PA27 — GPIO PA27, GCLK input |
| پین 4 | VBUS — USB VBUS sense input |
| پین 5 | USB_DP — USB D+ line |
| پین 6 | USB_DM — USB D- line |
| پین 7 | XIN32 — 32.768 kHz crystal input |
| پین 8 | XOUT32 — 32.768 kHz crystal output |
| پین 9 | VDDIO — I/O supply voltage |
| پین 10 | GND — Ground |
| پین 11 | PA28 — GPIO PA28 |
| پین 12 | PA30 — GPIO PA30, SWDIO |
| پین 13 | PA31 — GPIO PA31, SWCLK |
| پین 14 | PA15 — GPIO PA15, SERCOM3 |
| پین 15 | PA16 — GPIO PA16, SERCOM3 |
| پین 16 | PA17 — GPIO PA17, SERCOM3 |
| پین 17 | PA18 — GPIO PA18, SERCOM3 |
| پین 18 | PA19 — GPIO PA19, SERCOM3 |
| پین 19 | PA20 — GPIO PA20, SERCOM5 |
| پین 20 | PA21 — GPIO PA21, SERCOM5 |
| پین 21 | PA22 — GPIO PA22, SERCOM3/I2C |
| پین 22 | PA23 — GPIO PA23, SERCOM3/I2C |
| پین 23 | PA24 — GPIO PA24, USB SOF |
| پین 24 | USB_DP_2 — Reserved / NC depending on routing |
| پین 25 | USB_DM_2 — Reserved / NC depending on routing |
| پین 26 | GND — Ground |
| پین 27 | VDDIO — I/O supply voltage |
| پین 28 | VDDIN — Main regulator input |
| پین 29 | PA25 — GPIO PA25, USB ID |
| پین 30 | PB02 — GPIO PB02, ADC |
| پین 31 | PB03 — GPIO PB03, ADC |
| پین 32 | PB00 — GPIO PB00, ADC |
| پین 33 | PB01 — GPIO PB01, ADC |
| پین 34 | PB04 — GPIO PB04, ADC |
| پین 35 | PB05 — GPIO PB05, ADC |
| پین 36 | PB06 — GPIO PB06, ADC |
| پین 37 | PB07 — GPIO PB07, ADC |
| پین 38 | PB08 — GPIO PB08, ADC |
| پین 39 | PB09 — GPIO PB09, ADC |
| پین 40 | PA08 — GPIO PA08, ADC/PTC |
| پین 41 | PA09 — GPIO PA09, ADC/PTC |
| پین 42 | PA10 — GPIO PA10, ADC/PTC |
| پین 43 | PA11 — GPIO PA11, ADC/PTC |
| پین 44 | VDDANA — Analog supply voltage |
| پین 45 | GND — Ground |
| پین 46 | PA02 — GPIO PA02, DAC/VREFP |
| پین 47 | PA03 — GPIO PA03, DAC/VREFN |
| پین 48 | PA04 — GPIO PA04, AC0 |
| پین 49 | PA05 — GPIO PA05, AC1 |
| پین 50 | PA06 — GPIO PA06, AC2 |
| پین 51 | PA07 — GPIO PA07, AC3 |
| پین 52 | PB12 — GPIO PB12, SERCOM4 |
| پین 53 | PB13 — GPIO PB13, SERCOM4 |
| پین 54 | PB14 — GPIO PB14, SERCOM4 |
| پین 55 | PB15 — GPIO PB15, SERCOM4 |
| پین 56 | PA12 — GPIO PA12, SERCOM2 |
| پین 57 | PA13 — GPIO PA13, SERCOM2 |
| پین 58 | PA14 — GPIO PA14, SERCOM2 |
| پین 59 | PB16 — GPIO PB16, SERCOM5 |
| پین 60 | PB17 — GPIO PB17, SERCOM5 |
| پین 61 | PB10 — GPIO PB10, SERCOM4 |
| پین 62 | PB11 — GPIO PB11, SERCOM4 |
| پین 63 | PA00 — GPIO PA00, XIN |
| پین 64 | PA01 — GPIO PA01, XOUT |
کاربردهای معمول
ATSAMD21J18A-AUT مناسب است برای 7 کاربردs: 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.
پیشنهادی
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.
پیشنهادی
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.
پیشنهادی
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.
پیشنهادی
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.
پیشنهادی
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.
پیشنهادی
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.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای ATSAMD21J18A-AUT — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | 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 |
تفاوت‌های کلیدی
- Highest GPIO count in the SAM D21 family (در مقابلATSAMD21G18A-AUT)
- On-chip Full-Speed USB with internal transceiver (در مقابلATSAMD20J18A-MN)
- Industrial +85 C grade in Tape & Reel (در مقابلATSAMD21J18A-AU)
یادداشت‌های طراحی
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.
اطلاعات انطباق
AUT suffix = Tape & Reel industrial grade, not AEC-Q100. RoHS and REACH per Microchip product page.
