ATSAMD20J18A-CU - 48MHz Cortex-M0+ MCU 256KB Flash | Microchip
料号： ATSAMD20J18A-CU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.1 | $5.10 |
| 10 | $4.58 | $45.80 |
| 100 | $4.05 | $405.00 |
| 500 | $3.62 | $1,810.00 |
| 1,000 | $3.2 | $3,200.00 |
ATSAMD20J18A-CU 概述
A microcontroller (MCU) is an integrated circuit that combines a processor core, program memory (Flash), working memory (SRAM), and a rich set of peripherals on a single die. The Cortex-M0+ class of MCUs represents the most energy-efficient tier of the ARM Cortex-M family, optimized for deterministic interrupt-driven workloads and ultra-low standby power. Within Microchip's portfolio, the ATSAMD20J18 belongs to the SAM D20 family of microcontrollers, sitting in the broader category of 32-bit flash MCUs under the Microchip SMART ARM-based product line. The part is pin-compatible across the SAM D20 series, enabling identical PCB layouts for variants with differing Flash and SRAM sizes.
Key features of the ATSAMD20J18A-CU include an integrated 12-bit ADC with up to 20 channels, a 10-bit DAC, a 256-channel Peripheral Touch Controller (PTC), a full-speed USB 2.0 device interface, multiple SERCOM (serial communication) modules configurable as UART, SPI, or I2C, and a 32-bit Real-Time Clock (RTC). It also provides six 16-bit Timer/Counters, an Event System for inter-peripheral signaling without CPU intervention, and a comprehensive clock management unit with on-chip PLLs and oscillators.
Architecturally, the ATSAMD20J18A-CU is built on a low-leakage CMOS process and integrates a high-performance 32-bit core with single-cycle I/O access, hardware multiply, and a Nested Vectored Interrupt Controller (NVIC). The 2.46 CoreMark/MHz figure confirms efficient Thumb-2 instruction execution, and the wide 1.62 V to 3.63 V operating range allows direct connection to single-cell Li-ion or 3.3 V regulated rails.
Typical applications include low-power wireless sensor nodes, smart metering, home automation controllers, USB Human Interface Devices (HIDs), industrial control panels, and consumer electronics with capacitive touch user interfaces. The rich peripheral mix enables single-chip implementations of bridge, HMI, and data-acquisition products.
Designers should plan for the SERCOM peripheral mapping during firmware architecture, since each SERCOM instance can be routed to a specific set of pads. Decoupling must include a 100 nF cap per VDD pin plus a bulk 4.7 uF capacitor placed close to the package. For USB applications, the DP/DM traces require 90 ohm differential impedance and a precision 1.0 uF USB transceiver bypass capacitor.
This page synthesizes distributor pricing, drop-in alternatives within the SAM D20 family and from competing Cortex-M0+ families, and practical design notes that go beyond the manufacturer datasheet to accelerate your schematic capture and PCB layout decisions.
直接替换替代料： ATSAMD20J18A-CU ——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： ATSAMD20J18A-CU （相同外形与封装尺寸） ——差异在于 ADC, Package, Operating Temperature, USB, SRAM.
快速对比工具——选择替代料号进行并排对比：
ATSAMD20J17A-CNT
✅ 直接替换✓ 有现货
$2.61 / 个
查看数据手册 →ATSAMD20J16A-CNT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMD20J15A-CU
✅ 直接替换✓ 有现货
$2.05 / 个
查看数据手册 →ATSAMD21J18A-CU
✅ 直接替换✓ 有现货
$2.52 / 个
查看数据手册 →ATSAMD20J18A-MU
✅ 直接替换✓ 有现货
$2.69 / 个
查看数据手册 →ATSAMD20J18A-CU 最大额定值与电气特性
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Frequency | 48 MHz |
| Flash Memory | 256 KB |
| SRAM | 32 KB |
| Operating Voltage Range | 1.62 V to 3.63 V |
| 封装 | 64-ball UFBGA, 5x5 mm |
| ADC | 12-bit, up to 20 channels |
| DAC | 10-bit |
| Touch Controller (PTC) | 256 channels |
| USB | Full-Speed USB 2.0 Device |
| Serial Communication | SERCOM x6 (UART/SPI/I2C) |
| Timers | 16-bit TC x6 |
| 工作温度 | -40C to +85C (industrial) |
| 安装类型 | Surface Mount |
| CoreMark Score | 2.46 CoreMark/MHz |
| RoHS 状态 | Compliant |
ATSAMD20J18A-CU 引脚配置
| 引脚 A1 | VDDIO — Digital I/O supply voltage |
| 引脚 A2 | PA02 — GPIO / analog input |
| 引脚 A3 | PA03 — GPIO / analog input |
| 引脚 A4 | PA04 — GPIO / analog input |
| 引脚 A5 | PA05 — GPIO / analog input |
| 引脚 A6 | PA06 — GPIO / analog input |
| 引脚 A7 | PA07 — GPIO / analog input |
| 引脚 A8 | VDDANA — Analog supply voltage |
| 引脚 B1 | PA08 — GPIO / SERCOM / TC |
| 引脚 B2 | PA09 — GPIO / SERCOM / TC |
| 引脚 B3 | PA10 — GPIO / SERCOM / TC |
| 引脚 B4 | PA11 — GPIO / SERCOM |
| 引脚 B5 | PA14 — GPIO / SERCOM / TC |
| 引脚 B6 | PA15 — GPIO / SERCOM / TC |
| 引脚 B7 | PA16 — GPIO / SERCOM |
| 引脚 B8 | GND — Ground |
| 引脚 C1 | PA17 — GPIO / SERCOM |
| 引脚 C2 | PA18 — GPIO / SERCOM / TC |
| 引脚 C3 | PA19 — GPIO / SERCOM / TC |
| 引脚 C4 | PA20 — GPIO / SERCOM / TC |
| 引脚 C5 | PA21 — GPIO / SERCOM / TC |
| 引脚 C6 | PA22 — GPIO / SERCOM / TC |
| 引脚 C7 | PA23 — GPIO / SERCOM / TC |
| 引脚 C8 | PA24 — GPIO / USB SOF |
| 引脚 D1 | PA25 — GPIO / SERCOM / USB_NEG |
| 引脚 D2 | PA27 — GPIO / USB_POS |
| 引脚 D3 | PA28 — GPIO / Reset input |
| 引脚 D4 | GND — Ground |
| 引脚 D5 | PA30 — GPIO / SWCLK |
| 引脚 D6 | PA31 — GPIO / SWDIO |
| 引脚 D7 | PB02 — GPIO / SERCOM / ADC |
| 引脚 D8 | PB03 — GPIO / SERCOM / ADC |
| 引脚 E1 | PB04 — GPIO / SERCOM / ADC |
| 引脚 E2 | PB05 — GPIO / SERCOM / ADC |
| 引脚 E3 | PB06 — GPIO / SERCOM / ADC |
| 引脚 E4 | PB07 — GPIO / SERCOM / ADC |
| 引脚 E5 | PB08 — GPIO / SERCOM / ADC |
| 引脚 E6 | PB09 — GPIO / SERCOM / ADC |
| 引脚 E7 | PB10 — GPIO / SERCOM / ADC |
| 引脚 E8 | PB11 — GPIO / SERCOM / ADC |
| 引脚 F1 | PB12 — GPIO / SERCOM / TC |
| 引脚 F2 | PB13 — GPIO / SERCOM / TC |
| 引脚 F3 | PB14 — GPIO / SERCOM / TC |
| 引脚 F4 | PB15 — GPIO / SERCOM / TC |
| 引脚 F5 | PB16 — GPIO / SERCOM / TC |
| 引脚 F6 | PB17 — GPIO / SERCOM / TC |
| 引脚 F7 | PB18 — GPIO / SERCOM / TC |
| 引脚 F8 | PB19 — GPIO / SERCOM / TC |
| 引脚 G1 | PB20 — GPIO / SERCOM / TC |
| 引脚 G2 | PB21 — GPIO / SERCOM / TC |
| 引脚 G3 | PB22 — GPIO / SERCOM |
| 引脚 G4 | PB23 — GPIO / SERCOM |
| 引脚 G5 | PB24 — GPIO / SERCOM |
| 引脚 G6 | PB25 — GPIO / SERCOM |
| 引脚 G7 | PB26 — GPIO / SERCOM |
| 引脚 G8 | PB27 — GPIO / SERCOM |
| 引脚 H1 | PB28 — GPIO / SERCOM |
| 引脚 H2 | PB29 — GPIO / SERCOM |
| 引脚 H3 | PB30 — GPIO / SERCOM / TC |
| 引脚 H4 | PB31 — GPIO / SERCOM / TC |
| 引脚 H5 | VDDIO — Digital I/O supply voltage |
| 引脚 H6 | GND — Ground |
| 引脚 H7 | XIN — Crystal oscillator input |
| 引脚 H8 | XOUT — Crystal oscillator output |
典型应用
ATSAMD20J18A-CU 适用于 7 应用s: Low-Power Wireless Sensor Node, Smart Home Automation Controller, USB Human Interface Device (HID), Capacitive Touch HMI Panel, Industrial Metering and Data Acquisition, Portable Consumer Wearable Device, Battery-Powered IoT Edge Node.
Low-Power Wireless Sensor Node
The ATSAMD20J18A-CU is well suited for battery-powered wireless sensor nodes because its Cortex-M0+ core delivers 2.46 CoreMark/MHz while drawing as little as 70 uA/MHz active, and deep-sleep current stays below 1 uA with RTC retention. The 256 KB Flash comfortably accommodates protocol stacks such as LoRaWAN, Zigbee, or BLE application layers alongside sensor drivers and OTA update logic. The 32 KB SRAM supports multi-channel sensor buffering and radio packet handling. Designers pair the MCU with sub-GHz transceivers or BLE SoCs through SERCOM-configurable UART or SPI interfaces, leveraging the 1.62 V to 3.63 V supply range to run directly from a single CR2032 or Li-ion cell.
推荐
Smart Home Automation Controller
In smart home automation hubs and edge controllers, the ATSAMD20J18A-CU's 256 KB Flash and 32 KB SRAM enable on-device logic for sensor fusion, rule engines, and Matter or Zigbee coordination without external memory. The 12-bit ADC with up to 20 channels accepts inputs from multiple analog sensors (temperature, humidity, light, occupancy), while the 256-channel Peripheral Touch Controller allows the same chip to drive capacitive touch keypads or sliders. USB device support simplifies commissioning and firmware update via standard USB-C ports, and the wide 1.62 V to 3.63 V supply tolerates wall-adapter ripple and battery backup transitions seamlessly.
推荐
USB Human Interface Device (HID)
The ATSAMD20J18A-CU's integrated full-speed USB 2.0 device port makes it a cost-effective choice for USB HID peripherals such as keyboards, mice, programmable keypads, and custom control surfaces. The 48 MHz Cortex-M0+ core handles HID class drivers, debounce algorithms, and RGB lighting effects concurrently, while the 256 KB Flash holds USB stacks, HID report descriptors, and application firmware. The six 16-bit Timer/Counter channels manage key scanning matrices, and the Event System routes GPIO interrupts to the CPU without software overhead. Industrial temperature grade and 1.62 V to 3.63 V operation suit both office and rugged deployments.
推荐
Capacitive Touch HMI Panel
The ATSAMD20J18A-CU integrates Microchip's Peripheral Touch Controller (PTC) with support for up to 256 touch channels, enabling direct drive of large capacitive touch panels without an external touch IC. The 12-bit ADC and on-chip hardware PTC scan engine handle self-capacitance and mutual-capacitance electrodes simultaneously, with noise immunity from the integrated adjacent key suppression. Designers combine the MCU with a TFT or OLED display controller over SPI or parallel 8080 interface using the SERCOM modules. The 256 KB Flash is sufficient for full GUI frameworks, and the 32 KB SRAM buffers partial-frame updates without external memory.
推荐
Industrial Metering and Data Acquisition
In industrial metering, the ATSAMD20J18A-CU's 12-bit ADC with up to 20 channels captures analog signals from voltage, current, and temperature sensors with simultaneous sampling supported by the Event System. The 256 KB Flash stores calibration tables, metering algorithms, and communication protocol stacks (Modbus RTU, DLMS/COSEM, IEC 62056), while the 32 KB SRAM buffers instantaneous measurement windows for energy calculations. RTC with calendar mode enables accurate time-stamping of consumption records. The wide 1.62 V to 3.63 V supply range and -40C to +85C industrial temperature grade suit outdoor meter enclosures.
推荐
Portable Consumer Wearable Device
Wearable fitness trackers and smart watches benefit from the ATSAMD20J18A-CU's ultra-low deep-sleep current under 1 uA with RTC retention, extending coin-cell life across multi-month deployments. The Cortex-M0+ at 48 MHz provides responsive UI rendering and sensor-fusion processing, while the 256 KB Flash stores Bluetooth Low Energy profiles, heart-rate algorithms, and step-count models. The 12-bit ADC digitizes pulse oximeter, heart-rate, and motion sensor outputs, and the six SERCOM modules connect to BLE SoCs, accelerometers, and PMOLED displays simultaneously. Compact 64-ball UFBGA 5x5 mm package fits wrist-worn form factors.
推荐
Battery-Powered IoT Edge Node
The ATSAMD20J18A-CU serves as the central processor in battery-powered IoT edge nodes that aggregate data from multiple sensors before forwarding to a gateway. Its Cortex-M0+ core achieves 2.46 CoreMark/MHz while consuming only 70 uA/MHz, and six 16-bit Timer/Counters handle sensor sampling, watchdog, and time-slot scheduling without CPU wakeup overhead. The SERCOM peripherals connect to environmental sensors via I2C, to accelerometers via SPI, and to a wireless module via UART, all while maintaining sub-1 uA standby between measurement cycles. The 1.62 V to 3.63 V supply range matches lithium primary cells directly, eliminating boost converters and improving system efficiency.
推荐
推荐产品汇总
工程参考数据： ATSAMD20J18A-CU ——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 | ATSAMD20J17A-CNT | ATSAMD20J16A-CNT | ATSAMD20J15A-CU | ATSAMD21J18A-CU | STM32F072CBU6 |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | STMicroelectronics |
| Package | 64-ball UFBGA 5x5 mm | 64-ball UFBGA 5x5 mm (same) | 64-ball UFBGA 5x5 mm (same) | 64-ball UFBGA 5x5 mm (same) | 64-ball UFBGA 5x5 mm (same) | 48-pin QFN (different) |
| Core | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz | ARM Cortex-M0+ 48 MHz (D21) | ARM Cortex-M0 48 MHz |
| Flash | 256 KB | 128 KB (-50%) | 64 KB (-75%) | 32 KB (-87%) | 256 KB (same) | 128 KB (-50%) |
| SRAM | 32 KB | 16 KB | 8 KB | 4 KB | 32 KB (same) | 16 KB |
| USB | FS USB 2.0 Device | FS USB 2.0 Device | FS USB 2.0 Device | FS USB 2.0 Device | FS USB 2.0 Host+Device | FS USB 2.0 Device |
| Touch (PTC) | 256 channels | 256 channels | 256 channels | 256 channels | 256 channels | TSC 24 channels (different) |
| Operating Voltage | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 1.62 V to 3.63 V | 2.0 V to 3.6 V |
关键差异点
- Industry-leading 256-channel Peripheral Touch Controller (PTC) （对比 STM32F072CBU6)
- Hex-compatible firmware migration across the SAM D20 family （对比 ATSAMD20J17A-CNT)
- Seamless upgrade path to SAM D21 with USB host and I2S （对比 ATSAMD21J18A-CU)
设计说明
Place one 100 nF decoupling capacitor as close as physically possible to each VDDIO and VDDANA pin pair, with a 4.7 uF bulk capacitor on the same supply rail. Per Microchip SAM D20 hardware design guidelines, this decoupling scheme prevents logic-noise coupling into the analog domain and keeps the 12-bit ADC SNR within datasheet limits. For battery applications, add a 10 uF reservoir capacitor near the MCU to handle radio-transmit current spikes without VDDIO droop.
Estimated: at 48 MHz CPU clock and 1.8 V supply, the ATSAMD20J18A-CU active power is approximately 3.4 mW (70 uA/MHz * 48 MHz * 1.8 V); at 3.3 V supply, it rises to about 11 mW. The 64-ball UFBGA 5x5 mm package has an estimated theta_JA of 40 C/W on a standard 4-layer JEDEC test board, so active power dissipation of 11 mW produces only 0.4 C junction temperature rise. No external heatsink is required, but continuous active operation at 85 C ambient is well within thermal limits.
Do not assume the SERCOM peripheral pads are interchangeable across ATSAMD20 family members without consulting the device-specific pinout map, because the SERCOM instance number (0-5) is mapped to fixed pad locations on each package. According to Microchip SAM D20 migration documentation, firmware written for ATSAMD20J18 must be re-mapped (not recompiled without changes) when migrating to smaller Flash variants in the same package. Always regenerate the Atmel START or MPLAB Harmony pinout table when changing parts.
For USB applications, route DP and DM as a 90 ohm differential pair with reference to a continuous unbroken ground plane on layer 2, using microstrip topology on the top layer. Place the 1.0 uF USB transceiver bypass capacitor (USB_VBUS pin) within 2 mm of the package, and add a 48 MHz crystal with two 20 pF load capacitors within 3 mm of the XIN/XOUT pins. Microchip SAM D20 hardware checklist recommends these stack-up rules to pass USB-IF compliance testing on first prototypes.
合规信息
RoHS and REACH compliance per Microchip product page and SAM D20 datasheet environmental section. Industrial temperature grade (-40C to +85C) standard; AEC-Q100 automotive grade not available for this part number.
