ATSAMC21G18A-AUT - 256KB Flash 48MHz Cortex-M0+ MCU | Microchip
MPN： ATSAMC21G18A-AUT ✓ 啟用中ATSAMC21G18A-AUT 概覽
What is a Cortex-M0+ microcontroller? An ARM Cortex-M0+ is the smallest and most energy-efficient core in the Cortex-M family, designed for deeply embedded, deterministic 32-bit applications. It belongs to the broader microcontroller (MCU) hierarchy (microcontroller -> embedded processor -> semiconductor IC) and supersedes legacy 8/16-bit architectures by adding a 32-bit datapath, NVIC, and modern toolchain support while retaining ultra-low active and sleep currents. The SAM C21 series targets industrial and commercial designs in electrically noisy environments.
Key features of the ATSAMC21G18A-AUT include: SERCOM (Serial Communication Interface) modules that can be independently configured as UART, SPI, or I2C; a CAN-FD controller for high-bandwidth automotive networking; a 12-bit ADC, 10-bit DAC, and analog comparators; PWM timers with complementary outputs and dead-time insertion for motor control; and 5V-tolerant I/O allowing direct interface to legacy 5V peripherals without level shifters.
On the architecture side, the device uses the Cortex-M0+ v6M instruction set with a 2-stage pipeline, single-cycle I/O port access, and tightly-coupled SRAM for deterministic interrupt response. The CAN-FD peripheral supports ISO 11898-1:2015 frames with up to 64-byte payloads, and the SERCOM engine allows flexible pin mapping via the I/O multiplexing matrix.
Typical applications include industrial automation (sensor hubs, PLC I/O modules), automotive body and chassis electronics (using CAN-FD), building automation (HVAC, lighting controllers), home appliances, and low-cost motor control such as small BLDC or stepper drivers. AEC-Q100 grade 1 qualification also enables under-hood and dashboard deployment.
When designing with this MCU, plan the I/O multiplexing early because SERCOM and timer functions share mapping; Microchip's MPLAB Harmony Configurator (MCC) pin manager simplifies assignment. The 5V-tolerant pins tolerate but do not drive 5V outputs, so external level shifting is required when communicating with true 5V peripherals.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
直接替換替代品，適用於 ATSAMC21G18A-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： ATSAMC21G18A-AUT （相同外形與佔位） — 差異在於 ADC, Package, Operating Temperature, SERCOM Modules, SRAM.
ATSAMC21G18A-AU
✅ 直接替換聯絡詢價
查看資料表 →ATSAMC21G18A-MUT
✅ 直接替換📋 參考替代品（不在目錄中）
ATSAMC21G18A-AUT 最大額定值與電氣特性
| Core Processor | ARM Cortex-M0+ |
| Core Size | 32-Bit |
| Maximum Clock Speed | 48 MHz |
| Program Memory Size | 256 KB (256K x 8) Flash |
| EEPROM Emulation Region | 8 KB independent self-programmable Flash |
| RAM Size | 32 KB SRAM |
| 供應電壓 | 2.7 V to 5.5 V |
| I/O Voltage Tolerance | 5V-tolerant digital I/O |
| ADC | 12-bit |
| DAC | 10-bit |
| Communication Interfaces | SERCOM (UART/SPI/I2C), CAN-FD, I2S |
| 封裝 | 48-TQFP (7x7 mm) |
| 工作溫度 | -40C to +125C (automotive grade) |
| 安裝類型 | Surface Mount |
| AEC-Q100 | Qualified (Grade 1, automotive) |
| MSL 等級 | 3 (168 hours) |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
ATSAMC21G18A-AUT 腳位配置
| 腳位 1 | PA00 — General purpose I/O / SERCOM pad |
| 腳位 2 | PA01 — General purpose I/O / SERCOM pad |
| 腳位 3 | PA02 — General purpose I/O / ADC input |
| 腳位 4 | PA03 — General purpose I/O / ADC reference |
| 腳位 5 | GND — Ground |
| 腳位 6 | VDD |
| 腳位 7 | PA04 — General purpose I/O / SERCOM pad |
| 腳位 8 | PA05 — General purpose I/O / SERCOM pad |
| 腳位 9 | PA06 — General purpose I/O / SERCOM pad |
| 腳位 10 | PA07 — General purpose I/O / SERCOM pad |
| 腳位 11 | PA08 — General purpose I/O / SERCOM pad |
| 腳位 12 | PA09 — General purpose I/O / SERCOM pad |
| 腳位 13 | PA10 — General purpose I/O / SERCOM pad |
| 腳位 14 | PA11 — General purpose I/O / SERCOM pad |
| 腳位 15 | VDDIO — I/O voltage supply |
| 腳位 16 | GND — Ground |
| 腳位 17 | PA12 — General purpose I/O / SERCOM pad |
| 腳位 18 | PA13 — General purpose I/O / SERCOM pad |
| 腳位 19 | PA14 — General purpose I/O / SERCOM pad |
| 腳位 20 | PA15 — General purpose I/O / SERCOM pad |
| 腳位 21 | PA16 — General purpose I/O / SERCOM pad |
| 腳位 22 | PA17 — General purpose I/O / SERCOM pad |
| 腳位 23 | PA18 — General purpose I/O / SERCOM pad |
| 腳位 24 | PA19 — General purpose I/O / SERCOM pad |
| 腳位 25 | PA20 — General purpose I/O / SERCOM pad |
| 腳位 26 | PA21 — General purpose I/O / SERCOM pad |
| 腳位 27 | PA22 — General purpose I/O / SERCOM pad |
| 腳位 28 | PA23 — General purpose I/O / SERCOM pad |
| 腳位 29 | PA24 — General purpose I/O / SERCOM pad |
| 腳位 30 | PA25 — General purpose I/O / SERCOM pad |
| 腳位 31 | GND — Ground |
| 腳位 32 | VDD — Core voltage regulator input |
| 腳位 33 | PB00 — General purpose I/O / SERCOM pad |
| 腳位 34 | PB01 — General purpose I/O / SERCOM pad |
| 腳位 35 | PB02 — General purpose I/O / SERCOM pad |
| 腳位 36 | PB03 — General purpose I/O / SERCOM pad |
| 腳位 37 | PB04 — General purpose I/O / SERCOM pad |
| 腳位 38 | PB05 — General purpose I/O / SERCOM pad |
| 腳位 39 | PB06 — General purpose I/O / SERCOM pad |
| 腳位 40 | PB07 — General purpose I/O / SERCOM pad |
| 腳位 41 | PB08 — General purpose I/O / SERCOM pad |
| 腳位 42 | PB09 — General purpose I/O / SERCOM pad |
| 腳位 43 | PB10 — General purpose I/O / SERCOM pad |
| 腳位 44 | PB11 — General purpose I/O / SERCOM pad |
| 腳位 45 | VDDIO — I/O voltage supply |
| 腳位 46 | GND — Ground |
| 腳位 47 | NRST — Reset input (active-low) |
| 腳位 48 | SWDIO — SWD debug data |
典型應用
ATSAMC21G18A-AUT 適用於 6 應用s: Automotive Body Electronics with CAN-FD, Industrial Sensor Hubs and PLC I/O, BLDC and Stepper Motor Control, Building Automation (HVAC and Lighting), Home Appliance User Interface Controllers, Automotive Dashboard and Instrument Panels.
Automotive Body Electronics with CAN-FD
The ATSAMC21G18A-AUT's integrated CAN-FD controller supporting ISO 11898-1:2015 frames with up to 64-byte payloads makes it ideal for automotive body electronics such as seat controllers, mirror adjusters, and door modules. The AEC-Q100 Grade 1 qualification ensures reliable operation at -40C to +125C under hood and cabin thermal stress. The 256KB Flash accommodates J1939 and CANopen protocol stacks alongside application code.
推薦
Industrial Sensor Hubs and PLC I/O
The 5V-tolerant I/O and SERCOM modules of the ATSAMC21G18A-AUT allow direct interfacing with industrial 5V sensors, optocouplers, and actuator drivers without level shifters. The 12-bit ADC with internal reference and the 10-bit DAC support analog signal conditioning for 4-20mA loops and bridge sensors. The 32KB SRAM handles protocol stacks for Modbus RTU or IO-Link while the MPU isolates safety-critical tasks.
推薦
BLDC and Stepper Motor Control
The PWM timers with complementary outputs and dead-time insertion in the ATSAMC21G18A-AUT directly drive three-phase BLDC motor inverters or stepper motor bridges. The 48MHz core executes field-oriented control (FOC) algorithms at 10kHz switching frequency with margin to spare. The QFP package's exposed pad provides thermal relief for continuous motor drive operation.
推薦
Building Automation (HVAC and Lighting)
The ATSAMC21G18A-AUT's combination of CAN-FD, SERCOM, and analog peripherals suits building automation controllers for HVAC dampers, lighting dimmers, and occupancy sensors. The 5V tolerance allows direct interface with triac drivers and legacy building automation buses. The AEC-Q100 qualification enables deployment in equipment rooms with extended temperature ranges.
推薦
Home Appliance User Interface Controllers
The Peripheral Touch Controller (PTC) in the ATSAMC21G18A-AUT supports capacitive touch buttons and sliders for appliance front panels without external touch ICs. The SERCOM modules connect to Wi-Fi/BLE modules for smart appliance connectivity while CAN-FD interfaces with the main appliance control board. The 8KB EEPROM emulation Flash stores user settings and calibration data.
推薦
Automotive Dashboard and Instrument Panels
The ATSAMC21G18A-AUT's AEC-Q100 Grade 1 qualification and CAN-FD capability suit automotive dashboard controllers that aggregate data from body and chassis modules. The 5V-tolerant I/O drives segment LCDs or LED indicators directly, while SERCOM channels connect to rotary encoders and button matrices. The -40C to +125C operating range handles under-dash thermal extremes.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAMC21G18A-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 | ATSAMC21G18A-AU |
|---|---|---|
| Package | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) - same |
| Brand | Microchip Technology | Microchip Technology |
| Core Processor | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum Clock Speed | 48 MHz | 48 MHz |
| Flash Memory | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB |
| CAN-FD | Yes | Yes |
| 5V Tolerant I/O | Yes | Yes |
| AEC-Q100 Qualification | Yes (Grade 1) | No (industrial) |
| Operating Temperature | -40C to +125C | -40C to +85C |
主要差異化特點
- AEC-Q100 Grade 1 automotive qualification (對比ATSAMC21G18A-AU (industrial grade))
- Integrated CAN-FD controller (對比ATSAMD21G18A-AU (USB, no CAN))
- 5V-tolerant digital I/O (對比Typical 3.3V Cortex-M0+ MCUs)
設計說明
The ATSAMC21G18A-AUT operates from 2.7V to 5.5V with separate VDDIO and VDD pins for I/O and core supplies. Place 100nF decoupling capacitors as close as possible to each VDD and VDDIO pin, with a bulk 10uF capacitor on the main supply rail. The internal voltage regulator requires adequate bulk capacitance on VDDIN to handle transient load steps during flash programming.
The 48-pin TQFP package has a 0.5mm pitch and 7x7mm body size. Route the SWD signals (SWDIO, SWCLK) away from high-frequency switching nodes and provide a ground reference for impedance control. The SERCOM and timer functions share pins through an I/O multiplexing matrix - plan pin assignments early using Microchip's MPLAB Harmony Configurator pin manager.
The 5V-tolerant I/O pins tolerate 5V input but only drive 3.3V output levels - external level shifters are required for true 5V peripheral communication. The CAN-FD peripheral requires an external transceiver such as the MCP2562FD; the MCU only handles the protocol layer. The 8KB EEPROM emulation Flash is independent of the main Flash and must be managed separately for wear leveling.
The ATSAMC21G18A-AUT in the 48-TQFP package has a thermal resistance of approximately 60 C/W (theta_JA) on a standard 4-layer JEDEC test board. At 48MHz active mode with all peripherals running, power consumption is typically 8-10mA. In standby with RTC running, consumption drops to under 10uA. The AEC-Q100 Grade 1 qualification ensures operation from -40C to +125C ambient.
合規資訊
AEC-Q100 Grade 1 qualified per Microchip product page. RoHS and REACH compliant. Lead-free packaging. Halogen-free status not explicitly stated in available data.
