ATSAMD21J18A-AUT - 32-bit Cortex-M0+ MCU 256KB Flash 64-TQFP | Microchip
MPN： ATSAMD21J18A-AUT ✓ 啟用中ATSAMD21J18A-AUT 概覽
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.
直接替換替代品，適用於 ATSAMD21J18A-AUT — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATSAMD21J18A-AUT （相同外形與佔位） — 差異在於 ADC, USB, Operating Temperature, DAC, Package.
ATSAMD21J18A-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAMD21J18A-AFT
✅ 直接替換聯絡詢價
查看資料表 →ATSAMD21J18A-AF
✅ 直接替換聯絡詢價
查看資料表 →ATSAMD21J17A-AUT
✅ 直接替換聯絡詢價
查看資料表 →ATSAMD21J18A-AUT 最大額定值與電氣特性
| 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 |
| 封裝 | 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 |
| 工作溫度 | -40 C to +85 C (industrial, AUT grade) |
| RoHS 狀態 | Compliant |
| AEC-Q100 | Not qualified (AUT = tape & reel, not automotive grade) |
| Lead-Free / Halogen-Free | Yes (Green) |
ATSAMD21J18A-AUT 腳位配置
| 腳位 1 | PB23 — GPIO PB23, SERCOM5/PTC |
| 腳位 2 | PB22 — GPIO PB22, SERCOM5/PTC |
| 腳位 3 | PA27 — GPIO PA27, GCLK input |
| 腳位 4 | VBUS — USB VBUS sense input |
| 腳位 5 | USB_DP — USB D+ line |
| 腳位 6 | USB_DM — USB D- line |
| 腳位 7 | XIN32 — 32.768 kHz crystal input |
| 腳位 8 | XOUT32 — 32.768 kHz crystal output |
| 腳位 9 | VDDIO — I/O supply voltage |
| 腳位 10 | GND — Ground |
| 腳位 11 | PA28 — GPIO PA28 |
| 腳位 12 | PA30 — GPIO PA30, SWDIO |
| 腳位 13 | PA31 — GPIO PA31, SWCLK |
| 腳位 14 | PA15 — GPIO PA15, SERCOM3 |
| 腳位 15 | PA16 — GPIO PA16, SERCOM3 |
| 腳位 16 | PA17 — GPIO PA17, SERCOM3 |
| 腳位 17 | PA18 — GPIO PA18, SERCOM3 |
| 腳位 18 | PA19 — GPIO PA19, SERCOM3 |
| 腳位 19 | PA20 — GPIO PA20, SERCOM5 |
| 腳位 20 | PA21 — GPIO PA21, SERCOM5 |
| 腳位 21 | PA22 — GPIO PA22, SERCOM3/I2C |
| 腳位 22 | PA23 — GPIO PA23, SERCOM3/I2C |
| 腳位 23 | PA24 — GPIO PA24, USB SOF |
| 腳位 24 | USB_DP_2 — Reserved / NC depending on routing |
| 腳位 25 | USB_DM_2 — Reserved / NC depending on routing |
| 腳位 26 | GND — Ground |
| 腳位 27 | VDDIO — I/O supply voltage |
| 腳位 28 | VDDIN — Main regulator input |
| 腳位 29 | PA25 — GPIO PA25, USB ID |
| 腳位 30 | PB02 — GPIO PB02, ADC |
| 腳位 31 | PB03 — GPIO PB03, ADC |
| 腳位 32 | PB00 — GPIO PB00, ADC |
| 腳位 33 | PB01 — GPIO PB01, ADC |
| 腳位 34 | PB04 — GPIO PB04, ADC |
| 腳位 35 | PB05 — GPIO PB05, ADC |
| 腳位 36 | PB06 — GPIO PB06, ADC |
| 腳位 37 | PB07 — GPIO PB07, ADC |
| 腳位 38 | PB08 — GPIO PB08, ADC |
| 腳位 39 | PB09 — GPIO PB09, ADC |
| 腳位 40 | PA08 — GPIO PA08, ADC/PTC |
| 腳位 41 | PA09 — GPIO PA09, ADC/PTC |
| 腳位 42 | PA10 — GPIO PA10, ADC/PTC |
| 腳位 43 | PA11 — GPIO PA11, ADC/PTC |
| 腳位 44 | VDDANA — Analog supply voltage |
| 腳位 45 | GND — Ground |
| 腳位 46 | PA02 — GPIO PA02, DAC/VREFP |
| 腳位 47 | PA03 — GPIO PA03, DAC/VREFN |
| 腳位 48 | PA04 — GPIO PA04, AC0 |
| 腳位 49 | PA05 — GPIO PA05, AC1 |
| 腳位 50 | PA06 — GPIO PA06, AC2 |
| 腳位 51 | PA07 — GPIO PA07, AC3 |
| 腳位 52 | PB12 — GPIO PB12, SERCOM4 |
| 腳位 53 | PB13 — GPIO PB13, SERCOM4 |
| 腳位 54 | PB14 — GPIO PB14, SERCOM4 |
| 腳位 55 | PB15 — GPIO PB15, SERCOM4 |
| 腳位 56 | PA12 — GPIO PA12, SERCOM2 |
| 腳位 57 | PA13 — GPIO PA13, SERCOM2 |
| 腳位 58 | PA14 — GPIO PA14, SERCOM2 |
| 腳位 59 | PB16 — GPIO PB16, SERCOM5 |
| 腳位 60 | PB17 — GPIO PB17, SERCOM5 |
| 腳位 61 | PB10 — GPIO PB10, SERCOM4 |
| 腳位 62 | PB11 — GPIO PB11, SERCOM4 |
| 腳位 63 | PA00 — GPIO PA00, XIN |
| 腳位 64 | PA01 — GPIO PA01, XOUT |
典型應用
ATSAMD21J18A-AUT 適用於 7 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAMD21J18A-AUT — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Highest GPIO count in the SAM D21 family (對比ATSAMD21G18A-AUT)
- On-chip Full-Speed USB with internal transceiver (對比ATSAMD20J18A-MN)
- Industrial +85 C grade in Tape & Reel (對比ATSAMD21J18A-AU)
設計說明
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.
合規資訊
AUT suffix = Tape & Reel industrial grade, not AEC-Q100. RoHS and REACH per Microchip product page.
