ATSAMD20J18A-CN - ARM Cortex-M0+ MCU, 256KB Flash, 64-UFBGA
料号： ATSAMD20J18A-CN ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.55 | $35.50 |
| 100 | $3.12 | $312.00 |
| 500 | $2.84 | $1,420.00 |
| 1,000 | $2.61 | $2,610.00 |
ATSAMD20J18A-CN 概述
What is an ARM Cortex-M0+ microcontroller? An ARM Cortex-M0+ is an ultra-low-power 32-bit processor core designed by ARM Holdings, optimized for cost-sensitive embedded applications that require deterministic real-time behavior. It sits within the hierarchy of microcontroller categories: microcontroller -> 32-bit MCU -> ARM Cortex-M microcontroller -> Cortex-M0+ class, and within the SAM D20 product line it represents the entry point to Microchip's Cortex-M0+ portfolio.
Key features of the ATSAMD20J18A-CN include the integrated Peripheral Touch Controller (PTC) supporting up to 256 channels for capacitive touch interfaces, a 12-bit ADC with up to 20 channels, a 10-bit DAC, SERCOM (serial communication) modules configurable as UART/SPI/I2C, and a full-speed USB 2.0 device interface. The Event System allows inter-peripheral signaling without CPU intervention, reducing software complexity and power consumption.
The architecture uses single-cycle I/O access, hardware multiplier, and Microchip's proprietary SleepWalking technology for peripheral-level clock gating. The 48 MHz Cortex-M0+ core delivers 0.93 DMIPS/MHz, sufficient for sensor fusion, motor control, and HMI applications.
Typical applications include home automation control panels, smart metering endpoints, consumer appliances with capacitive touch, industrial sensor hubs, and battery-powered IoT edge nodes. The combination of low active current (~3 mA at 48 MHz), multiple low-power sleep modes, and fast wake-up time makes it suitable for energy-harvesting designs.
When designing with this part, evaluate decoupling strategy carefully: place one 100 nF X7R ceramic capacitor on each VDD/VDDIO pair as close to the IC as possible, and provide a 4.7 uF bulk capacitor on the main rail. Verify I/O bank voltage compatibility - all GPIO must reference the same VDDIO rail for the bank to operate correctly.
This page synthesizes distributor pricing, drop-in alternatives from the same SAM D20 family, and practical design notes not found in the manufacturer datasheet alone.
直接替换替代料： ATSAMD20J18A-CN ——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-CN （相同外形与封装尺寸） ——差异在于 ADC, Package, Peripheral Touch Controller (PTC), RoHS Status, DAC.
快速对比工具——选择替代料号进行并排对比：
ATSAMD20J18A-AU
✅ 直接替换✓ 有现货
$2.15 / 个
查看数据手册 →ATSAMD20J17A-CNT
✅ 直接替换✓ 有现货
$2.61 / 个
查看数据手册 →ATSAMD20J18A-CNT
✅ 直接替换📋 参考替代料（不在目录中）
ATSAMC21J18A-MUT64
✅ 直接替换✓ 有现货
$2.85 / 个
查看数据手册 →ATSAMD20J18A-CN 最大额定值与电气特性
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Clock | 48 MHz |
| Flash Memory | 256 KB |
| SRAM | 32 KB |
| Operating Voltage | 1.6 V to 3.6 V |
| 封装 | 64-pin UFBGA (WLCSP) |
| Temperature Grade | -40C to +105C |
| ADC | 12-bit, up to 20 channels |
| DAC | 10-bit |
| Peripheral Touch Controller (PTC) | Up to 256 channels |
| SERCOM Modules | 6 (configurable UART/SPI/I2C) |
| USB | Full-speed USB 2.0 Device |
| DMA Channels | 12 |
| RoHS 状态 | Compliant |
ATSAMD20J18A-CN 64-pin ufbga (wlcsp) 引脚配置指南
ATSAMD20J18A-CN（64-pin ufbga (wlcsp) 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： ATSAMD20J18A-CN.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATSAMD20J18A-CN 适用于 6 应用s: Smart Home Touch HMI, Industrial Sensor Hub, Smart Metering Endpoints, Battery-Powered IoT Edge Node, Consumer Appliance Control, Wearable Health Monitor.
Smart Home Touch HMI
The ATSAMD20J18A-CN is ideal for capacitive-touch home automation panels thanks to its integrated Peripheral Touch Controller supporting up to 256 channels with hardware-accelerated scan and moisture-compensation algorithms. The 256 KB Flash stores full IEC 60730 Class B safety libraries plus Zigbee 3.0 or BLE 5 stacks, while 32 KB SRAM holds touch state and event buffers. Six SERCOM peripherals allow simultaneous UART-to-MCU host, SPI-to-WiFi module, I2C-to-sensor hub, and I2C-to-EEPROM operation. The 48 MHz Cortex-M0+ runs Atmel START graphical frameworks, and the 1.6-3.6 V supply range accepts both battery-backed and 3.3 V rail designs without additional regulation.
推荐
Industrial Sensor Hub
For industrial 4-20 mA sensor hubs and field transmitters, the ATSAMD20J18A-CN delivers 12-bit ADC accuracy with 20 channels, hardware DMA for continuous acquisition, and an Event System that triggers conversions without CPU load. The 48 MHz core supports MODBUS RTU stacks, while the 105C operating range handles factory-floor heat. The integrated 10-bit DAC can drive 4-20 mA loops via external op-amps, and the 256 KB Flash stores firmware plus calibration tables. Compared to discrete ADC+MCU designs, the SAM D20 reduces component count by approximately 40%, improving mean-time-between-failure rates in continuous-operation industrial installations.
推荐
Smart Metering Endpoints
The ATSAMD20J18A-CN suits electricity, water, and gas metering endpoints where regulatory compliance and 10+ year battery life are required. Its RTC-domain backup mode consumes under 1.5 uA while retaining timekeeping, and the Cortex-M0+ executes signed firmware verification routines within the 256 KB Flash budget. Hardware AES peripheral (when available) accelerates secure communication for DLMS/COSEM or wireless M-Bus stacks. The integrated 32 KB SRAM buffers measurement intervals, and the 12-bit ADC captures current/voltage sensing with 0.1% accuracy. The 105C temperature grade supports outdoor meter enclosures in direct sun exposure.
推荐
Battery-Powered IoT Edge Node
For battery-powered IoT edge sensors running BLE or LoRaWAN protocols, the ATSAMD20J18A-CN balances performance and energy efficiency. SleepWalking peripherals allow ADC and SERCOM to wake the CPU only on threshold events, while Idle mode drops current to ~3 mA at 48 MHz and Standby mode under 5 uA. The 256 KB Flash stores full LoRaWAN 1.0.4 stacks (~80 KB) plus application firmware, OTA update slots, and crypto libraries. The 32 KB SRAM supports TLS handshake buffers for secure MQTT communication. The integrated USB 2.0 device simplifies direct firmware updates from USB power banks during field commissioning.
推荐
Consumer Appliance Control
The ATSAMD20J18A-CN fits consumer white-goods controllers (washing machines, dishwashers, refrigerators) requiring capacitive touch buttons, motor-control timing, and safety-critical firmware. The 256 KB Flash stores IEC 60335 Class B self-test routines plus UI logic, while the 32 KB SRAM supports real-time control loops. Six SERCOM channels interface to motor drivers (via SPI), user-interface displays (I2C), temperature sensors, and WiFi modules. The 105C operating range withstands ambient heat behind appliance panels, and the integrated PTC eliminates external touch ICs in designs with 8-20 buttons, reducing BOM cost by approximately $0.80 per unit.
推荐
Wearable Health Monitor
The ATSAMD20J18A-CN is suitable for wearable health monitors (heart-rate straps, pulse oximeters, fitness bands) where PCB area is constrained and battery life matters. Its 5x5 mm 64-UFBGA package fits inside wristbands, and the SleepWalking ADC continuously samples PPG or ECG signals at sub-microamp current. The 12-bit ADC achieves medical-grade resolution for SpO2 calculation, while 32 KB SRAM buffers raw waveform data before BLE transmission. The integrated USB simplifies direct charging dock firmware updates. Compared to discrete MCU+BLE SoC designs, the SAM D20 allows separate optimization of compute and radio subsystems.
推荐
推荐产品汇总
工程参考数据： ATSAMD20J18A-CN ——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 | ATSAMD20J18A-AU | ATSAMD20J17A-CNT | ATSAMD20J18A-CNT | ATSAMC21J18A-MUT64 |
|---|---|---|---|---|---|
| Package | 64-UFBGA (5x5 mm) | 64-QFN (9x9 mm) | 64-UFBGA (5x5 mm) - identical footprint | 64-UFBGA (5x5 mm) - identical footprint | 64-QFN (9x9 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Memory | 256 KB | 256 KB | 128 KB | 256 KB | 256 KB |
| SRAM | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| Maximum Clock | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| USB | Full-speed USB 2.0 Device | Full-speed USB 2.0 Device | Full-speed USB 2.0 Device | Full-speed USB 2.0 Device | Full-speed USB 2.0 Device |
| Peripheral Touch Controller | 256 channels | 256 channels | 256 channels | 256 channels | 256 channels |
| ADC | 12-bit, 20 channels | 12-bit, 20 channels | 12-bit, 20 channels | 12-bit, 20 channels | 12-bit, 20 channels |
| Operating Voltage | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 2.7 V to 5.5 V |
关键差异点
- Higher memory within the same UFBGA footprint （对比 ATSAMD20J17A-CNT)
- Smaller footprint than QFN alternative （对比 ATSAMD20J18A-AU)
- Drop-in upgrade path to CAN-FD via SAM C21 （对比 ATSAMC21J18A-MUT64)
设计说明
Estimated: Place a 100 nF X7R 0402 ceramic capacitor on each VDD/VDDIO pin pair within 2 mm of the package balls. Add a single 4.7 uF X5R bulk capacitor on the main VDD rail. The SAM D20 internal LDO draws up to 40 mA during 48 MHz operation; the bulk capacitor prevents voltage droop during peripheral activation. For USB applications, increase bulk capacitance to 10 uF to comply with USB 2.0 inrush current requirements (per Microchip SAM D20 datasheet section on power supply design).
Estimated: At continuous 48 MHz operation drawing 7 mA active current from 3.3 V, the 64-UFBGA package dissipates approximately 23 mW. With theta_JA around 50 C/W for the BGA package, junction temperature rise above ambient is only 1.2 C - well below the 105C limit. The SAM D20 internal thermal shutdown activates at 120 C junction, providing safety margin for hot-spot scenarios. For designs with sustained SleepWalking operation, thermal rise is negligible.
Estimated: Route the 48 MHz main crystal traces as short as possible (under 5 mm) and surround with a ground guard ring to prevent coupling into adjacent SERCOM lines. Place the crystal within 3 mm of the XIN/XOUT pins. For USB applications, route D+/D- as a 90 ohm differential pair with length matching within 2 mm, and keep the pair away from switching regulator nodes. The UFBGA ball pitch of 0.5 mm requires laser-drilled microvias or via-in-pad for breakout; escape routing should fan out to 0.4 mm pitch BGA escape pattern.
The SAM D20 I/O bank voltage (VDDIO) must match VDD before any GPIO is driven; otherwise, the I/O buffers can latch up. Always power up VDDIO and VDD from the same rail or use a power-sequencing supervisor. Do not enable the USB peripheral before the PLL is stable, as the USB engine will misinterpret bus states. For capacitive touch designs, configure the PTC acquisition frequency to avoid harmonics of nearby SMPS switching frequencies - typically use frequencies above 500 kHz when switching converters operate at 250 kHz.
合规信息
RoHS compliant per Microchip product page. The 'CN' suffix denotes lead-free UFBGA package. Not AEC-Q100 qualified - for automotive applications consider ATSAMx70 family or dedicated AEC-Q100 grade MCUs.
