ATSAM3X8CA-AU - 84MHz Cortex-M3 MCU 512KB Flash | Microchip
料号： ATSAM3X8CA-AU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $10.95 | $10.95 |
| 10 | $9.85 | $98.50 |
| 100 | $8.72 | $872.00 |
| 500 | $7.95 | $3,975.00 |
| 1,000 | $7.18 | $7,180.00 |
ATSAM3X8CA-AU 概述
A microcontroller (MCU) is a single integrated circuit that combines a processor core, memory, and peripherals to serve as the brain of an embedded system. The ATSAM3X8CA-AU belongs to the SAM3X/A family, part of the broader ARM Cortex-M based 32-bit microcontroller class within Microchip's SMART ARM-based MCU portfolio, sitting above 8-bit AVR MCUs and alongside Cortex-M4 SAM4 parts.
Key features include the ARM Cortex-M3 revision 2.0 core with Thumb-2 instruction set, a Memory Protection Unit (MPU), a 24-bit SysTick counter, and Nested Vectored Interrupt Controller (NVIC). Integrated high-speed USB with an on-chip transceiver enables fast data up/downloading, and the dual-bank Flash architecture supports safe in-application firmware updates.
Connectivity is comprehensive: CAN, Ethernet MAC, I2C (TWI), IrDA, LIN, MMC/SDIO, SPI, SSC, UART, and USB. Rich analog and timing peripherals make the device suitable for complex control and communication nodes. This exact silicon is best known as the MCU of the Arduino Due board, giving it a very large ecosystem of code, libraries, and community support.
Typical applications include industrial automation and control, CAN/Ethernet networking nodes, 3D printers, motor control, data loggers, and USB-connected instruments.
Design consideration: the dual 256 KB Flash banks allow read-while-write operation for bootloader strategies, but Flash wait states increase at 84 MHz, so code performance tuning via the cache/acceleration layer is worthwhile.
This page adds value beyond the datasheet by synthesizing distributor pricing tiers, drop-in same-family alternatives, practical design notes, and an Arduino Due ecosystem context not found on typical product pages.
直接替换替代料： ATSAM3X8CA-AU ——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： ATSAM3X8CA-AU （相同外形与封装尺寸） ——差异在于 Connectivity, Supply Voltage, SRAM, Package, Flash Memory.
快速对比工具——选择替代料号进行并排对比：
ATSAM3X8C-AU
✅ 直接替换📋 参考替代料（不在目录中）
ATSAM3X4C-AU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATSAM3X8CA-AUT
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATSAM3S8BA-MUR
✅ 直接替换✓ 有现货
$5.15 / 个
查看数据手册 →ATSAM3N4BA-MU
✅ 直接替换✓ 有现货
$3.48 / 个
查看数据手册 →ATSAM3X8CA-AU 最大额定值与电气特性
| Core Processor | ARM Cortex-M3 revision 2.0 |
| Core Size | 32-bit |
| Maximum Clock Speed | 84 MHz |
| Flash Memory | 512 KB (2 x 256 KB banks) |
| SRAM | 96 KB (64 KB + 32 KB banks) |
| Instruction Set | Thumb-2 |
| Memory Protection | MPU (Memory Protection Unit) |
| Connectivity | CAN, Ethernet, I2C, IrDA, LIN, MMC, SPI, SSC, UART, USB |
| USB | High-speed USB with integrated transceiver |
| 电源电压 | 1.62 V to 3.6 V |
| 工作温度 | -40C to +85C |
| 封装 | 100-LQFP (14 x 14 mm) |
| 安装类型 | Surface Mount |
| SysTick Timer | 24-bit |
| Interrupt Controller | NVIC (Nested Vectored Interrupt Controller) |
| Series | SAM3X/A |
| RoHS 状态 | Compliant (Green package) |
ATSAM3X8CA-AU 100-lqfp (14 x 14 mm) 引脚配置指南
ATSAM3X8CA-AU（100-lqfp (14 x 14 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： ATSAM3X8CA-AU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATSAM3X8CA-AU 适用于 6 应用s: 3D Printers and Digital Fabrication, Industrial Automation and Control, USB-Connected Instruments and Data Loggers, CAN Networking Nodes, Motor Control, Networking and IoT Gateways.
3D Printers and Digital Fabrication
The ATSAM3X8CA-AU is the controller of the Arduino Due, making it a de-facto standard for high-performance 3D printer mainboards. Its 84 MHz Cortex-M3 core executes step-generation and planner math far faster than 8-bit AVR alternatives, enabling higher microstepping rates and smoother motion. The 512 KB dual-bank Flash holds large firmware images (Marlin-class) with headroom for OTA-style updates, while 96 KB SRAM buffers G-code segments. USB device connectivity with the integrated high-speed transceiver provides reliable host communication, and SPI/UART channels interface TMC-class stepper drivers and thermistor ADC front-ends.
推荐
Industrial Automation and Control
In factory automation nodes, the ATSAM3X8CA-AU combines an on-chip CAN controller with an Ethernet MAC, allowing one MCU to bridge fieldbus and plant-network domains without external protocol silicon. The 84 MHz Cortex-M3 with MPU supports deterministic control loops and RTOS-based task isolation, and the industrial -40C to +85C rating covers cabinet environments. Dual-bank 512 KB Flash permits field firmware updates over Ethernet or CAN with rollback safety, an essential reliability feature in deployed equipment. Its 3.3 V I/O and rich UART/SPI/I2C complement connect PLC I/O modules, sensors, and HMI links.
推荐
USB-Connected Instruments and Data Loggers
The integrated high-speed USB transceiver of the ATSAM3X8CA-AU supports fast data up/downloading, which suits test instruments and logging devices that stream measurement data to a PC. The 96 KB SRAM (64 KB + 32 KB banks) provides generous buffering for burst acquisition, while DMA-class peripheral access offloads the Cortex-M3 core during transfers. The 24-bit SysTick and NVIC enable precise timestamping of logged events. Dual-bank Flash allows firmware updates in the field via the same USB link, and the Thumb-2 instruction set keeps data-processing routines compact and efficient.
推荐
CAN Networking Nodes
For vehicle and industrial CAN nodes, the ATSAM3X8CA-AU offers an on-chip CAN controller with the processing headroom to run higher-layer stacks such as CANopen or J1939 alongside application logic at 84 MHz. The industrial temperature rating of -40C to +85C and RoHS-compliant 100-LQFP package suit engine-bay-adjacent and cabinet installations. LIN and IrDA support add auxiliary bus options, and SPI/SSC connect to gateway PHYs. The 512 KB Flash accommodates diagnostic firmware, DTC storage code, and bootloader images with comfortable margin.
推荐
Motor Control
The ATSAM3X8CA-AU handles motor control tasks by exploiting its 84 MHz Cortex-M3 core for field-oriented control arithmetic, its timer resources for PWM generation, and CAN connectivity for networked drives. The 96 KB SRAM holds control state, observers, and commutation tables while Flash banks store parameter sets and diagnostics. Because the part is a general-purpose MCU, designers should verify ADC sampling rates and PWM channel counts in the SAM3X/A datasheet against their specific control topology (BLDC, PMSM, or stepper). Its high-speed USB port also enables drive commissioning and tuning via a PC GUI.
推荐
Networking and IoT Gateways
As a gateway MCU, the ATSAM3X8CA-AU couples its Ethernet MAC and CAN/UART peripheral suite to bridge sensor buses to IP networks. The 84 MHz core runs lightweight TCP/IP stacks such as lwIP, and the MPU plus Thumb-2 architecture support structured, secure firmware partitioning. Dual 256 KB Flash banks allow golden-image recovery bootloaders - a practical requirement for remotely deployed gateways. The 3.3 V, 1.62 V to 3.6 V supply range simplifies single-rail power design, and SPI connects Wi-Fi or LoRa modules for wireless extension of the wired backbone.
推荐
推荐产品汇总
工程参考数据： ATSAM3X8CA-AU ——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 | ATSAM3X8C-AU | ATSAM3X4C-AU | ATSAM3S8BA-MUR | ATSAM3N4BA-MU |
|---|---|---|---|---|---|
| Package | 100-LQFP (14x14) | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP - same footprint family | 100-LQFP - same footprint family |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Speed | ARM Cortex-M3, 84 MHz | ARM Cortex-M3, 84 MHz | ARM Cortex-M3, 84 MHz | ARM Cortex-M3, lower max speed (SAM3S family) | ARM Cortex-M3, 96 MHz class (SAM3N) |
| Ethernet MAC | Yes | Yes | Yes | No | No |
| CAN | Yes | Yes | Yes | No | No |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C class | -40C to +85C class |
关键差异点
- Integrated Ethernet MAC plus CAN in one MCU （对比 ATSAM3S8BA-MUR)
- Double the Flash of the low-cost sibling （对比 ATSAM3X4C-AU)
- Arduino Due ecosystem leverage （对比 ATSAM3N4BA-MU)
设计说明
Design the supply for a nominal 3.3 V rail within the 1.62 V to 3.6 V operating window of the SAM3X8CA. Use separate low-ESR decoupling on each VDDIO/VDDCORE pin pair per the Microchip SAM3X/A datasheet power scheme, with 100 nF ceramics placed within 2 mm of each supply pin plus bulk 4.7 uF. Note that I/O is not 5 V tolerant - level shifting is mandatory when interfacing legacy 5 V peripherals, a frequent failure source when porting from 8-bit AVR designs.
For the 100-LQFP 14 x 14 mm package, fan out high-frequency pins (USB, Ethernet RMII, SSC) first with short, matched traces. Provide a solid ground plane under the chip and stitch the Ethernet/CAN differential pairs with controlled impedance. Decouple the USB VDDUTMI pin independently. Keep crystal traces short and guarded by ground. Follow the Microchip SAM3X hardware design guidelines for the ERASE/NVMRSE pin network to guarantee production programming access.
Flash wait states must be configured for the 84 MHz clock per the datasheet electrical characteristics table; running at full speed with default reset wait-state settings causes hard faults. Additionally, dual-bank Flash read-while-write requires correct bank mapping in the linker script - writing the bank the code executes from stalls the CPU. Budget 96 KB SRAM carefully: the 64 KB + 32 KB split means large heap allocations may not be contiguous across banks.
合规信息
GREEN IND TEMP package per Mouser listing indicates Microchip green (RoHS, halogen-free) molding with industrial temperature rating. Full REACH and conflict-minerals declarations not found in provided data.