ATSAMD21G18A-MUT - ARM Cortex-M0+ 48MHz 256KB Flash MCU
料号： ATSAMD21G18A-MUT ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.26 | $5.26 |
| 10 | $4.74 | $47.40 |
| 100 | $4.21 | $421.00 |
| 500 | $3.79 | $1,895.00 |
| 1,000 | $3.37 | $3,370.00 |
ATSAMD21G18A-MUT 概述
A microcontroller (MCU) is a single-chip computer that integrates a processor core, program memory (Flash), working memory (SRAM), and programmable I/O peripherals. The ATSAMD21G18A belongs to the ARM Cortex-M0+ class - the smallest and most energy-efficient 32-bit core in the ARM Cortex-M family - which targets cost-sensitive embedded applications that previously used 8-bit or 16-bit MCUs while delivering significantly higher code density, deterministic interrupt response, and modern toolchain support. Within the taxonomy: microcontroller -> embedded processor -> semiconductor device, the Cortex-M0+ sits at the low-power / low-cost end of the ARM-M lineup.
Key features of the ATSAMD21G18A-MUT include: up to 38 GPIO with peripheral touch capability (PTC), a 12-channel DMA controller, a 12-channel Event System for inter-peripheral signalling, up to five 16-bit Timer/Counters, two I2C, up to six SERCOM (configurable as UART/SPI/I2C), one full-speed USB, one CAN 2.0B, a 12-bit 350 ksps ADC, a 10-bit DAC, and two analog comparators. The Serial Wire Debug (SWD) interface and a non-maskable interrupt (NMI) are standard.
Architecturally, the device uses a single-cycle I/O bus, a low-leakage RAM retention scheme, SleepWalking peripherals, and six sleep modes (IDLE, STANDBY, BACKUP, OFF, Hibernate Sleep and Hibernate Standby). The integrated USB transceiver removes the need for external PHY components, which simplifies USB device designs and reduces BOM cost.
Typical applications include: home automation nodes (Zigbee/BLE bridges, smart thermostats), consumer electronics (wearables, remote controls, gaming accessories), metering (electricity/water/gas meters), industrial sensor hubs, and USB peripherals (HID, CDC, custom HID-class devices). For USB applications in particular, the integrated transceiver and on-chip pull-ups simplify USB device certification.
Design considerations: ensure the VDDCORE pin is decoupled with a 1 µF + 100 nF pair, route D+/D- as a 90-ohm differential pair on the PCB, and configure the XOSC32K crystal load capacitors per the crystal manufacturer's CL specification. Drop-in migration paths exist within the SAM D21 family: the ATSAMD21G18A-MU and ATSAMD21G18A-MF share identical 48-pin QFN pinout with different memory maps.
This page consolidates distributor pricing, drop-in cross-reference alternatives, application companion parts, and PCB layout guidance not always found on the manufacturer datasheet, structured for fast engineer evaluation.
直接替换替代料： ATSAMD21G18A-MUT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATSAMD21G18A-MUT （相同外形与封装尺寸） ——差异在于 USB, Package, Operating Temperature, ADC, DAC.
快速对比工具——选择替代料号进行并排对比：
ATSAMD21G18A-MU
✅ 直接替换✓ 有现货
$3.15 / 个
查看数据手册 →ATSAMD21G18A-MF
✅ 直接替换✓ 有现货
$2.61 / 个
查看数据手册 →ATSAMD21G17A-MUT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD21G17D-MU
✅ 直接替换✓ 有现货
$2.1 / 个
查看数据手册 →ATSAMD21G16B-MUT
✅ 直接替换✓ 有现货
$2.05 / 个
查看数据手册 →ATSAMD21G16L-MUT
✅ 直接替换✓ 有现货
$2.55 / 个
查看数据手册 →ATSAMD21G18A-MUT 最大额定值与电气特性
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Frequency | 48 MHz |
| Performance | 2.46 CoreMark/MHz |
| Flash Memory | 256 KB |
| SRAM | 32 KB |
| Supply Voltage (VDDIN) | 1.62 V to 3.63 V |
| GPIO Count | Up to 38 |
| USB | USB 2.0 Full-Speed, on-chip transceiver |
| ADC | 12-bit, up to 350 ksps |
| DAC | 10-bit, 350 ksps |
| SERCOM (configurable) | Up to 6 (UART/SPI/I2C) |
| I2C | 2 |
| CAN | 1 (CAN 2.0B) |
| Timer/Counters | Up to 5 x 16-bit |
| DMA Channels | 12 |
| 封装 | 48-pin QFN (7x7 mm) |
| 工作温度 | -40 °C to +85 °C (industrial) |
| Debug Interface | Serial Wire Debug (SWD) |
| RoHS 状态 | Compliant |
| 安装类型 | Surface Mount |
ATSAMD21G18A-MUT 48-pin qfn (7x7 mm) 引脚配置指南
ATSAMD21G18A-MUT（48-pin qfn (7x7 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： ATSAMD21G18A-MUT.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATSAMD21G18A-MUT 适用于 6 应用s: USB HID / CDC Peripherals, Home Automation Sensor Hubs, Smart Metering (Electricity/Water/Gas), Industrial Sensor / IO Modules, Wearable & Fitness Devices, Consumer Remote Controls & HIDs.
USB HID / CDC Peripherals
The ATSAMD21G18A-MUT's integrated USB 2.0 Full-Speed transceiver with on-chip pull-up and 3.3 V regulator eliminates external PHY components, making it ideal for USB HID keyboards, mice, custom HID game controllers, and CDC virtual COM port devices. The 32 KB SRAM buffers USB descriptors and HID reports comfortably without bus-starved CPU intervention, while 256 KB Flash holds bootloader plus complex HID report descriptors and CDC class firmware. At 48 MHz Cortex-M0+ it sustains full 12 Mbps USB traffic with headroom for application logic; the 90-ohm D+/D- differential pair requirement must be observed on the PCB. Pair with USBLC6-2SC6 for ESD protection on USB pins.
推荐
Home Automation Sensor Hubs
The ATSAMD21G18A-MUT addresses home-automation sensor hubs requiring wireless co-processor bridging, capacitive touch buttons, and low standby power. Six SERCOM peripherals handle concurrent SPI (for radio modules like AT86RF233 or NRF24L01), I2C (for sensors), and UART (for debug); the integrated 12-bit ADC reads analog light/temperature sensors directly. SleepWalking peripherals and the 6-mode power architecture cut standby to <1 µA, satisfying Energy Star and EU ecodesign requirements. The 38 GPIO support capacitive touch (PTC) for slider/wheel user interfaces typical of smart thermostats.
推荐
Smart Metering (Electricity/Water/Gas)
The ATSAMD21G18A-MUT's Cortex-M0+ 48 MHz core, 32 KB SRAM, and 12-bit 350 ksps ADC suit electronic metering applications including single-phase electricity meters, water meters with pulse counting, and gas meters. Its CAN 2.0B interface connects to industrial meter-bus architectures; the RTC with calendar supports TOU tariff scheduling. The wide 1.62-3.63 V supply range tolerates battery droop during brown-outs. Industrial temperature grade (-40 °C to +85 °C) ensures deployment in outdoor meter enclosures. Per Microchip, the SAM D21 family is widely deployed in smart metering reference designs.
推荐
Industrial Sensor / IO Modules
The ATSAMD21G18A-MUT is suited for industrial 4-20 mA loop-powered sensor transmitters, IO-Link master/slave modules, and Modbus RTU field devices. The 12-bit ADC with PGA, two analog comparators, and 10-bit DAC enable direct analog signal conditioning; the SERCOM ports drive RS-485 transceivers (via UART) for Modbus RTU. The 256 KB Flash supports full IEC 61131-3 or Modbus stack plus application logic; the Cortex-M0+ deterministic interrupt response is critical for industrial control loops. Operating from -40 °C to +85 °C and the 3.63 V tolerant I/O ease integration with 24 V industrial rails after external level shifting.
推荐
Wearable & Fitness Devices
Wearable fitness bands, BLE heart-rate straps, and activity trackers benefit from the ATSAMD21G18A-MUT's small 7x7 mm QFN footprint, low active current, and SERCOM-based BLE co-processor interface. Six sleep modes including Hibernate (sub-µA) extend coin-cell battery life; the 12-bit ADC samples PPG (photoplethysmogram) signals at low duty cycle. The integrated USB simplifies charging and firmware updates without external PHYs. The 38 GPIO supports direct drive of small OLED displays and capacitive touch buttons; the on-chip 10-bit DAC generates audio prompts or haptic-driver PWM.
推荐
Consumer Remote Controls & HIDs
Universal IR/RF remote controls, presentation clickers, and gaming peripherals leverage the ATSAMD21G18A-MUT's 48 MHz performance, 256 KB Flash for large IR code libraries, and the PTC peripheral for capacitive touch buttons. Low-power idle modes extend battery life across AAA coin cells; the integrated USB enables wired HID mode without external components. Cortex-M0+ deterministic interrupt response ensures accurate IR carrier generation and zero-latency HID reports. Drop-in sibling variants (G16B/G17A) provide cost-down options for simplified remotes.
推荐
推荐产品汇总
工程参考数据： ATSAMD21G18A-MUT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATSAMD21G18A-MU | ATSAMD21G18A-MF | ATSAMD21G17A-MUT | ATSAMD21G16B-MUT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 48-pin QFN (7x7 mm) | 48-pin QFN (7x7 mm) | 48-pin QFN (7x7 mm) | 48-pin QFN (7x7 mm) | 48-pin QFN (7x7 mm) |
| Flash Memory | 256 KB | 256 KB | 256 KB | 128 KB | 64 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 16 KB | 8 KB |
| CPU Frequency | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| USB | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated | USB 2.0 Full-Speed integrated |
| SERCOM Count | Up to 6 | Up to 6 | Up to 6 | Up to 6 | Up to 6 |
| Carrier Type | Tape & Reel | Tray | Tray | Tape & Reel | Tape & Reel |
关键差异点
- Largest Flash/SRAM in the SAM D21G family （对比 ATSAMD21G17A-MUT)
- Tape & Reel carrier optimized for high-volume SMT （对比 ATSAMD21G18A-MU)
- Integrated USB Full-Speed PHY eliminates external components （对比 ATSAMD20G18A-MU)
设计说明
Decouple the ATSAMD21G18A-MUT supply pins with a 1 µF X7R + 100 nF X7R pair per VDDIN pin and a 1 µF + 100 nF pair on VDDCORE. Place the 100 nF capacitors within 1-2 mm of the respective pins. The on-chip voltage regulator requires at least 4.7 µF total bulk capacitance on VDDCORE for stable operation across all sleep modes per Microchip datasheet 40001882A.
Route the USB D+ and D- pins as a 90-ohm differential pair with length-matched traces (±150 mil) on the top layer over a continuous ground plane. Keep the pair length under 50 mm and avoid stubs. Place the USBLC6-2SC6 ESD array within 5 mm of the USB connector. The exposed pad (EP) of the QFN-48 must be soldered to the PCB ground plane with multiple thermal vias (typically 9 vias in a 3x3 grid, 0.3 mm drill) to meet thermal and electrical performance targets.
Do not omit the NRESET pull-up (10 kΩ to VDDIN) - the internal pull-up is weak and can cause intermittent resets in noisy environments. Configure the GCLK and PMC early in the firmware before enabling peripherals; otherwise the system may lock up on first boot. The XOSC32K load capacitors must match the crystal manufacturer's CL specification (C_L = (C1*C2)/(C1+C2) + C_stray) to avoid frequency error in RTC and USB applications.
The SERCOM peripheral can be configured as UART, SPI, or I2C on demand, but switching modes requires disabling the peripheral first. For I2C fast-mode (400 kHz) and fast-mode-plus (1 MHz), add 4.7 kΩ external pull-ups since the internal pull-ups (~40 kΩ) are too weak for reliable operation with capacitive buses >50 pF. For SPI at >10 MHz, route the clock and data lines as length-matched pairs with a series 22-33 Ω damping resistor near the driver to suppress ringing.
合规信息
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified - choose ATSAMx automotive variants for AEC-Q100. Lead-free / Halogen-free per Microchip environmental compliance documentation.
