ATSAMD20G18A-AU - 48MHz Cortex-M0+ MCU 256KB Flash | Microchip
MPN: ATSAMD20G18A-AU ✓ Hoạt độngATSAMD20G18A-AU Tóm tắt
What is a Cortex-M0+ microcontroller? A microcontroller (MCU) is a single-chip computer integrating a CPU core, program memory (Flash), working memory (SRAM), and peripherals such as ADC, timers, and communication controllers. The Cortex-M0+ is ARM's smallest, most energy-efficient application processor core, targeting cost-sensitive and battery-powered embedded designs. The ATSAMD20G18 belongs to the hierarchy: microcontroller -> ARM Cortex-M0+ MCU -> 32-bit MCU -> SAM D20 family -> low-power MCU, suitable for home automation, consumer, metering, and industrial nodes.
Key features include 256 KB in-system programmable Flash (supporting Atmel/Microchip SAM-BA bootloader and SWD programming), 32 KB SRAM, a 12-bit 350 ksps ADC with up to 14 channels, a 10-bit 350 ksps DAC, six SERCOM channels configurable as USART/SPI/I2C, a 24-bit timer/counter for control applications, and a 32 kHz RTC. The device supports 1.62 V to 3.63 V single-supply operation and integrates an 8-channel Event System and a Peripheral Touch Controller for capacitive touch user interfaces.
The ATSAMD20G18A-AU uses a 2-layer AHB bus matrix with separate code and data buses for deterministic interrupt latency, plus a low-power SleepWalking peripheral event fabric that wakes individual peripherals from sleep without waking the CPU, enabling < 10 uA/MHz active and deep-sleep currents below 1 uA. The 48-pin TQFP package provides easy hand-soldering and broad PCB layout compatibility for industrial designs.
Typical applications include smart-home lighting controllers, low-power wireless sensor hubs, capacitive touch user interfaces for consumer appliances, industrial motor control FOC commutation blocks, battery-powered metering endpoints, and USB-to-UART bridge firmware development kits. The wide 1.62-3.63 V supply range and PTC peripheral make it a strong fit for IoT end nodes and human-machine interface panels.
When designing with this part, allocate the 256 KB Flash carefully: a full Atmel/Microchip ASF or Harmony 3 stack with USB and graphics consumes 100-150 KB, leaving 100-150 KB for application code. Use the SWD header for in-circuit programming rather than relying on the bootloader pin only, and provide a 32.768 kHz crystal if RTC accuracy is required below 2 percent error.
Bộ thay thế dễ dàng lắp đặt cho ATSAMD20G18A-AU — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATSAMD20G18A-AU (cùng hình factor và footprint) — khác nhau ở ADC, Package, Peripheral Touch Controller (PTC), DAC, Operating Temperature Range.
ATSAMD20G17A-AU
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Xem tài liệu →ATSAMD20G18A-AU Tỷ lệ tối đa & tính chất điện
| Core | ARM Cortex-M0+ (32-bit) |
| Family | SAM D20 (Atmel SMART) |
| Maximum CPU Clock | 48 MHz |
| CoreMark Score | 2.14 CoreMark/MHz |
| Flash Program Memory | 256 KB (256K x 8) |
| SRAM | 32 KB |
| Operating Voltage (VDDIN) | 1.62 V to 3.63 V |
| GPIO Pins | 38 |
| ADC | 12-bit, up to 350 ksps |
| DAC | 10-bit, 350 ksps |
| Peripheral Touch Controller (PTC) | 256-channel capacitive touch |
| Communication Peripherals | 6 SERCOM (USART/SPI/I2C), I2S, USB 2.0 FS (device) |
| Timers/Counters | TC (8-bit/16-bit/24-bit), RTC, WDT |
| Nhiệt độ hoạt động | -40C to +85C (industrial, -AU suffix) |
| Hộp | 48-pin TQFP (7x7 mm) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
| Programming/Debug | SWD, SAM-BA bootloader |
Cấu hình chân ATSAMD20G18A-AU
| Chân 1 | PA00 — GPIO / XIN32 (32 kHz crystal input) |
| Chân 2 | PA01 — GPIO / XOUT32 (32 kHz crystal output) |
| Chân 3 | PA02 — GPIO / ADC input channel 0 / PTC |
| Chân 4 | PA03 — GPIO / ADC input channel 1 / PTC / DAC VREF |
| Chân 5 | GND — Ground |
| Chân 6 | VDDIN — Main voltage supply input (1.62-3.63 V) |
| Chân 7 | VDDIO — I/O voltage supply |
| Chân 8 | PA04 — GPIO / VBUS detect / ADC input channel 4 |
| Chân 9 | PA05 — GPIO / USB VBUS detect |
| Chân 10 | PA06 — GPIO / ADC input channel 6 / PTC |
| Chân 11 | PA07 — GPIO / ADC input channel 7 / PTC |
| Chân 12 | PA08 — GPIO / SERCOM0 PAD0 / PTC |
| Chân 13 | PA09 — GPIO / SERCOM0 PAD1 / PTC |
| Chân 14 | PA10 — GPIO / SERCOM0 PAD2 / PTC |
| Chân 15 | PA11 — GPIO / SERCOM0 PAD3 / PTC |
| Chân 16 | VDDIO — I/O voltage supply |
| Chân 17 | GND — Ground |
| Chân 18 | PA12 — GPIO / SERCOM2 PAD0 / PTC |
| Chân 19 | PA13 — GPIO / SERCOM2 PAD1 / PTC |
| Chân 20 | PA14 — GPIO / SERCOM2 PAD2 / PTC |
| Chân 21 | PA15 — GPIO / SERCOM2 PAD3 / PTC |
| Chân 22 | PA16 — GPIO / SERCOM1 PAD0 / PTC |
| Chân 23 | PA17 — GPIO / SERCOM1 PAD1 / PTC |
| Chân 24 | PA18 — GPIO / SERCOM1 PAD2 / PTC |
| Chân 25 | PA19 — GPIO / SERCOM1 PAD3 / PTC |
| Chân 26 | PA20 — GPIO / SERCOM3 PAD0 / PTC |
| Chân 27 | PA21 — GPIO / SERCOM3 PAD1 / PTC |
| Chân 28 | PA22 — GPIO / SERCOM3 PAD2 / PTC |
| Chân 29 | PA23 — GPIO / SERCOM3 PAD3 / PTC |
| Chân 30 | GND — Ground |
| Chân 31 | VDDIN — Main voltage supply input |
| Chân 32 | PA24 — GPIO / SERCOM4 PAD0 / USB DP |
| Chân 33 | PA25 — GPIO / SERCOM4 PAD1 / USB DM |
| Chân 34 | PA26 — GPIO / SERCOM4 PAD2 |
| Chân 35 | PA27 — GPIO / SERCOM4 PAD3 |
| Chân 36 | PA28 — GPIO / SERCOM5 PAD0 |
| Chân 37 | PA29 — GPIO / SERCOM5 PAD1 |
| Chân 38 | PA30 — GPIO / SERCOM5 PAD2 / SWDIO |
| Chân 39 | PA31 — GPIO / SERCOM5 PAD3 / SWCLK |
| Chân 40 | PB00 — GPIO / PTC |
| Chân 41 | PB01 — GPIO / PTC |
| Chân 42 | PB02 — GPIO / SERCOM5 PAD0 / ADC channel 10 |
| Chân 43 | PB03 — GPIO / SERCOM5 PAD1 / ADC channel 11 |
| Chân 44 | PB04 — GPIO / PTC |
| Chân 45 | PB05 — GPIO / PTC |
| Chân 46 | PB06 — GPIO / PTC |
| Chân 47 | PB07 — GPIO / PTC |
| Chân 48 | PB08 — GPIO / PTC / LED0 |
Ứng dụng tiêu biểu
ATSAMD20G18A-AU phù hợp cho 7 Áp dụngs: Smart Home Lighting Controller, Battery-Powered IoT Sensor Node, Capacitive Touch User Interface, Industrial Motor Control FOC, Smart Energy Metering Endpoint, USB-to-UART Bridge Firmware Development Kit, Consumer Appliance HMI Panel.
Smart Home Lighting Controller
The ATSAMD20G18A-AU's 256 KB Flash and 38 GPIO make it a strong fit for smart-home lighting hubs that drive multiple LED channels and run a wireless or mesh protocol stack. With six SERCOM channels, the MCU can simultaneously host a UART-connected wireless module, an SPI-driven LED driver, an I2C ambient-light sensor, and an I2S audio path. Operating from 1.62-3.63 V allows direct connection to a Li-Po battery pack without an extra regulator, while PTC support enables capacitive touch dimmer panels. SleepWalking peripherals keep idle current below 1 uA, suiting always-on wall-switch designs.
Được đề xuất
Battery-Powered IoT Sensor Node
Low-power IoT end nodes benefit from the ATSAMD20G18A-AU's SleepWalking event fabric, which can wake individual ADC, SERCOM, or timer peripherals without waking the CPU, keeping active consumption below 10 uA/MHz. The 1.62-3.63 V single-supply range allows direct Li-ion/Li-Po or 2x AA alkaline operation without an additional LDO, saving BOM cost in coin-cell sensor designs. With 256 KB Flash, the part hosts a full BLE-software-stack or LoRaWAN AT-command parser, while 32 KB SRAM supports TCP/IP or 6LoWPAN buffers. The 12-bit ADC and integrated temperature sensor simplify analog front-end design.
Được đề xuất
Capacitive Touch User Interface
The ATSAMD20G18A-AU integrates a 256-channel Peripheral Touch Controller (PTC) that supports both self-capacitance and mutual-capacitance touch patterns, eliminating the need for an external touch IC in appliance and consumer-electronics UI designs. With 38 GPIO and a 12-bit ADC for slider/wheel position, the MCU can directly scan a 5-inch TFT with on-cell touch or a keypad with backlight LEDs. The 256 KB Flash fits a full LVGL or emWin graphics stack, and the 10-bit DAC generates contrast voltage for the LCD. Industrial -40C to +85C operation suits kitchen, automotive-cabin, and outdoor applications.
Được đề xuất
Industrial Motor Control FOC
Field-oriented control (FOC) for small BLDC or PMSM motors fits comfortably in the ATSAMD20G18A-AU's 256 KB Flash, where Microchip's MCC-generated FOC library performs space-vector PWM, Clarke-Park transforms, and PI current loops at the 48 MHz CPU clock. The 24-bit timer/counter provides deterministic PWM edges with sub-microsecond resolution, and the 12-bit ADC with up to 14 channels samples the three phase currents plus DC-bus voltage synchronously to the PWM. The SERCOM interfaces connect to isolated gate drivers, encoder SPI, and CAN-FD or RS-485 communication, with industrial -40C to +85C operation.
Được đề xuất
Smart Energy Metering Endpoint
Smart electricity, water, and gas meters benefit from the ATSAMD20G18A-AU's 32 KB SRAM for metrology buffers and its 12-bit 350 ksps ADC that captures voltage and current waveforms at 4 ksps for harmonic analysis. The integrated 10-bit DAC provides a calibration tone output during production test, while the 32 kHz RTC domain keeps time-of-use metering accurate over power outages via a backup coin cell. The wide 1.62-3.63 V supply range supports direct connection to the meter's switched-mode power supply. The 38 GPIO drive LCD segment displays, EEPROM, and isolated communication links without external logic.
Được đề xuất
USB-to-UART Bridge Firmware Development Kit
Engineers building USB-CDC bridges, JTAG/SWD emulators, or firmware-update dongles often start from the ATSAMD20G18A-AU because of its USB 2.0 Full Speed device port, six SERCOM channels for multi-protocol bridging, and 256 KB Flash for vendor-class firmware. The SAM-BA bootloader enables drag-and-drop programming via the USB mass-storage interface, removing the need for an external programmer during development. The 48-pin TQFP package is easy to hand-solder and breadboard-friendly, while the SWD header exposes full debugging via Atmel Studio, MPLAB X, or VS Code with the CMSIS-Pack extension.
Được đề xuất
Consumer Appliance HMI Panel
Washing machines, ovens, coffee machines, and air-conditioner front panels benefit from the ATSAMD20G18A-AU's combination of 256 KB Flash for LVGL/emWin graphics, 12-bit ADC for slider and rotary-knob position sensing, and 38 GPIO for keypad matrix, LED drivers, and buzzer PWM. The PTC peripheral supports capacitive touch buttons without an external IC, while the 10-bit DAC generates contrast voltage for the LCD. Industrial -40C to +85C operation survives kitchen environments, and the 1.62-3.63 V supply works directly from rectified mains via a small buck converter. The -AU suffix confirms lead-free RoHS compliance for global markets.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAMD20G18A-AU — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ATSAMD20G17A-AU | ATSAMD20G15A-AU | ATSAMD21G18A-AU | ATSAMD20G16A-AU | ATSAMD20E18A-AU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-TQFP (7x7 mm) | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same | 48-TQFP (7x7 mm) - same |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum CPU Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 256 KB | 128 KB | 64 KB | 256 KB | 64 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 8 KB | 32 KB |
| USB | USB 2.0 FS device | USB 2.0 FS device | USB 2.0 FS device | USB 2.0 FS host+device | USB 2.0 FS device | USB 2.0 FS device |
| ADC Speed | 12-bit, 350 ksps | 12-bit, 350 ksps | 12-bit, 350 ksps | 12-bit, 1 Msps | 12-bit, 350 ksps | 12-bit, 350 ksps |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| 1-piece Price (USD) | 5.31 | 4.78 | 4.20 | 6.10 | 4.05 | 5.50 |
Bảo phân biệt quan trọng
- Largest Flash in the SAM D20 48-TQFP pinout family (vsATSAMD20G17A-AU)
- Direct path to upgrade within the same footprint (vsATSAMD21G18A-AU)
- Integrated PTC for touch UI (vsExternal touch IC designs)
- SAM-BA USB bootloader (vsParts requiring external programmers)
Ghi chú thiết kế
Provide a 1 uF X7R decoupling capacitor close to each VDDIO pin (pins 7 and 16) and a 4.7 uF bulk capacitor on VDDIN (pins 6 and 31) per the Microchip SAM D20 datasheet power-supply reference schematic. A ferrite bead plus 10 uF capacitor forms a clean analog AVDD rail if the ADC is used, and a separate digital VDD keeps ADC noise below 1 LSB. Decouple VDDIO before VDDIN to avoid inrush current glitching.
Route the SWDIO (PA30) and SWCLK (PA31) signals as a 100-ohm differential pair or with at least 3W spacing from switching signals and 50-ohm controlled impedance, terminating within 50 mm of the MCU. Place the 32.768 kHz crystal within 5 mm of PA00/PA01 with a guard ring tied to GND to avoid radiated noise coupling. Keep the USB DP/DM traces matched within 0.15 mm and 90-ohm differential, with the D+/D- traces no longer than 50 mm.
Do not enable the brown-out detector (BOD) at 1.62 V if the supply is a Li-Po battery approaching end-of-discharge voltage, or the MCU will reset unexpectedly. Avoid configuring the SERCOM I2C pins without external 4.7 kohm pull-ups to VDDIO, as the Cortex-M0+ SERCOM pads do not have strong internal pull-ups. Do not exceed the absolute maximum VDDIN of 3.63 V or the Flash memory may corrupt.
Estimated: at 48 MHz, VDDIN = 3.3 V, and active CPU load 100%, the typical active current is 9 mA (about 190 uA/MHz from the SAM D20 datasheet typical curves), giving 30 mW of dissipation. The 48-TQFP has a theta_JA around 70 C/W, so junction temperature rise above ambient is about 2.1 C, which is negligible. No heatsink is required, and the -40C to +85C industrial grade provides ample thermal headroom for typical embedded applications.
When routing the 12-bit ADC inputs to external sensors, add a 100 nF X7R capacitor at each ADC pin within 5 mm to suppress clock-noise injection from the digital domain. Drive the ADC reference pin (AREF) with a low-noise reference such as the Microchip MCP1525 or a clean 3.3 V rail filtered through a ferrite bead. If using the DAC, buffer the output with an op-amp such as MCP6002 if driving a low-impedance load.
Thông tin tuân thủ
RoHS and REACH compliant per Microchip product page. The -AU ordering suffix indicates lead-free matte-tin plating suitable for 260C reflow soldering. Industrial -40C to +85C operating temperature range. Halogen-free per Microchip declaration letter.
