ATSAM3A8CA-AU - 84MHz Cortex-M3 MCU, 512KB Flash | Microchip
料号： ATSAM3A8CA-AU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $9.2 | $9.20 |
| 10 | $8.45 | $84.50 |
| 100 | $7.6 | $760.00 |
| 500 | $6.95 | $3,475.00 |
| 1,000 | $6.3 | $6,300.00 |
ATSAM3A8CA-AU 概述
A flash microcontroller is a single-chip embedded processor that integrates a CPU core, program flash, SRAM, clock system, and a rich set of peripherals onto one die. Within the power-management hierarchy, an MCU such as the SAM3A sits at the lowest level of a control system, directly driving actuators, communications transceivers, and user interfaces. The ATSAM3A8CA-AU belongs to the SAM3A family, a branch of the Atmel (now Microchip) SAM3 series based on the ARM Cortex-M3 revision 2.0 processor.
Key features include the Thumb-2 instruction set, a Memory Protection Unit (MPU), a 24-bit SysTick timer, and a Nested Vector Interrupt Controller (NVIC). Peripheral connectivity is extensive: CAN, I2C (Two-Wire Interface), IrDA, LIN, MMC/SD, SPI, SSC (synchronous serial controller), and UART/USART ports. A distinctive family feature is the integrated high-speed USB 2.0 device transceiver, enabling fast firmware up/downloading and plug-and-play serial interconnectivity with robust EMI tolerance.
Architecturally, the Cortex-M3 revision 2.0 core delivers deterministic interrupt latency through the NVIC and efficient code density through Thumb-2, while the dual-bank flash arrangement supports safe in-application firmware updates. The 96KB SRAM split into 64KB + 32KB banks allows concurrent buffering of communications data and application variables.
Typical applications include industrial CAN networking nodes, USB-connected industrial and medical instruments, motor-control interfaces via SSC and UART/USART, and embedded gateways that bridge CAN buses to USB or SPI peripherals.
Design consideration: the device operates from a 1.62V to 3.6V single supply (typical 1.8V, 2.5V, or 3.3V systems), so ensure the VDDIO and VDDCORE domains are properly decoupled and that the 12MHz crystal or internal RC source meets the PLL lock requirements before enabling the 84MHz clock tree.
This page synthesizes distributor pricing signals, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
直接替换替代料： ATSAM3A8CA-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： ATSAM3A8CA-AU （相同外形与封装尺寸） ——差异在于 Package, Connectivity, Series, Supply Voltage, Flash Memory.
快速对比工具——选择替代料号进行并排对比：
ATSAM3X8CA-AU
✅ 直接替换✓ 有现货
$7.18 / 个
查看数据手册 →ATSAM3A8CA-CU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATSAM3S8CA-AU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATSAM3S4CA-AU
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
ATSAM3SD8CA-AU
✅ 直接替换✓ 有现货
$3.14 / 个
查看数据手册 →ATSAM3A8CA-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 | 512KB (2 x 256KB banks) |
| SRAM | 96KB (64KB + 32KB banks) |
| 电源电压 | 1.8 V / 2.5 V / 3.3 V (1.62 V to 3.6 V range) |
| Connectivity | CAN, I2C, IrDA, LIN, MMC, SPI, SSC, UART/USART, USB |
| USB | High-speed USB 2.0 device with integrated transceiver |
| Instruction Set | Thumb-2 |
| Memory Protection | MPU (Memory Protection Unit) |
| SysTick Timer | 24-bit |
| Interrupt Controller | NVIC (Nested Vector Interrupt Controller) |
| 封装 | 100-LQFP (14 x 14 mm) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (Green package per Mouser listing) |
| Series | SAM3A |
ATSAM3A8CA-AU 100-lqfp (14 x 14 mm) 引脚配置指南
ATSAM3A8CA-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： ATSAM3A8CA-AU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
ATSAM3A8CA-AU 适用于 6 应用s: Industrial CAN Networking Nodes, High-Speed USB Instruments, Motor Control Interfaces, Embedded CAN-to-USB Gateways, Battery-Powered Data Loggers, Building Automation Controllers.
Industrial CAN Networking Nodes
The ATSAM3A8CA-AU fits industrial CAN nodes because it integrates a CAN controller alongside the 84 MHz Cortex-M3 core and 96KB SRAM, providing the buffering headroom for multi-frame message queues in automation and factory networks. In a typical node, the MCU reads sensors via SPI or I2C, processes protocol logic in Thumb-2 code, and streams CAN frames through an external transceiver such as the Microchip MCP2551. The 1.62V to 3.6V supply tolerance and green industrial-temperature package suit 24V industrial cabinets with 3.3V logic rails. Unlike 8-bit MCUs, the dual-bank 512KB flash supports field firmware updates over the CAN bus itself, so deployed equipment can be upgraded without physical access, a decisive benefit in large installations.
推荐
High-Speed USB Instruments
Instruments that stream data to a PC benefit directly from the ATSAM3A8CA-AU's integrated high-speed USB 2.0 device transceiver. Because the PHY is on-chip, the design needs only USB termination resistors and a 480 Mbps-compliant layout, avoiding an external ULPI PHY and its 60 MHz interface routing. The 64KB + 32KB SRAM split lets one bank serve as USB DMA buffers while the other holds ADC or SSC acquisition data, sustaining wire-speed transfers. The datasheet's stated plug-and-play interconnectivity and robust EMI tolerance make it suitable for lab meters, data loggers, and medical diagnostic boxes where the USB link doubles as the power source. Firmware upload via USB using SAM-BA also simplifies production programming and end-user updates.
推荐
Motor Control Interfaces
The ATSAM3A8CA-AU serves as the communication and supervision controller in motor-drive systems, complementing a dedicated motor driver. Its SSC (Synchronous Serial Controller) handles encoder or codec interfaces with hardware support, while multiple UART/USART ports link to drives, HMIs, and PLC backplanes. The 84 MHz Cortex-M3 with NVIC provides deterministic interrupt response for time-critical control loops, and the MPU enables isolation of safety-critical firmware regions. CAN connectivity integrates the controller into industrial fieldbus architectures for distributed motion control. The 512KB flash accommodates protocol stacks such as CANopen alongside the application, and the dual-bank arrangement allows bootloader-based updates so drive firmware can be revised in the field without replacing hardware.
推荐
Embedded CAN-to-USB Gateways
Bridging CAN bus networks to PCs is a classic fit for this MCU because both interfaces are native peripherals: the CAN controller on one side and the high-speed USB device transceiver on the other. A gateway built on the ATSAM3A8CA-AU tunnels CAN frames over USB at 480 Mbps, far exceeding typical 1 Mbps CAN utilization, so the bridge never becomes the bottleneck. The 96KB SRAM buffers burst traffic during bus-load peaks, and the MPU separates the firmware update region from the routing engine. Commercial USB-CAN adapters built on the SAM3A/SAM3X family exploit exactly this combination. The 100-LQFP 14x14 mm footprint keeps the adapter PCB within a compact housing suitable for portable diagnostics tools.
推荐
Battery-Powered Data Loggers
For data loggers, the ATSAM3A8CA-AU balances throughput and power: the Cortex-M3 executes logging and compression code quickly so the CPU can return to sleep states rapidly, and the 1.62V to 3.6V supply range allows direct operation from a single lithium or three-cell alkaline stack with an LDO. Peripherals including I2C and SPI connect flash storage and sensors, while the MMC/SD interface writes directly to removable cards without a software bit-banging overhead. The dual-bank flash stores a bootloader in one bank and application plus logging firmware in the other, enabling safe field updates of deployed loggers. High-speed USB provides fast log dumps to a host PC when the unit is docked, avoiding slow serial extraction.
推荐
Building Automation Controllers
Building automation controllers require multiple serial channels and a robust fieldbus, both of which the ATSAM3A8CA-AU provides natively: several UART/USART ports for metering and sensor loops, I2C for environmental sensors, SPI for displays and memory, and CAN for the controller-area backbone. The 84 MHz core runs protocol stacks such as CANopen or device profiles in 512KB flash with room to spare, and 96KB SRAM supports multiple concurrent sessions. The green industrial-temperature 100-LQFP package meets the thermal and compliance requirements of control cabinets. Thumb-2 code density keeps external memory unnecessary, and the 24-bit SysTick plus NVIC deliver the periodic timing precision that HVAC scheduling and lighting control demand.
推荐
推荐产品汇总
工程参考数据： ATSAM3A8CA-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 | ATSAM3X8CA-AU | ATSAM3A8CA-CU | ATSAM3S8CA-AU | ATSAM3S4CA-AU | ATSAM3SD8CA-AU |
|---|---|---|---|---|---|---|
| Package | 100-LQFP (14x14 mm) | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same | 100-LQFP (14x14 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Speed | Cortex-M3, 84 MHz | Cortex-M3, 84 MHz | Cortex-M3, 84 MHz | Cortex-M3, 84 MHz | Cortex-M3, 84 MHz | Cortex-M3, 84 MHz |
| Flash Memory | 512KB (2 x 256KB) | 512KB (2 x 256KB) | 512KB (2 x 256KB) | 512KB | 256KB | 512KB |
| SRAM | 96KB (64KB + 32KB) | 96KB (64KB + 32KB) | 96KB (64KB + 32KB) | 128KB | 64KB | 96KB |
| CAN Controller | Yes | Yes | Yes | No | No | No |
| USB Speed | High-speed (480 Mbps), integrated transceiver | High-speed, integrated transceiver | High-speed, integrated transceiver | Full-speed only | Full-speed only | Full-speed only |
| Series | SAM3A (CAN-centric) | SAM3X (USB-centric) | SAM3A | SAM3S (general purpose) | SAM3S (general purpose) | SAM3SD (device controller) |
| Supply Voltage | 1.8V / 2.5V / 3.3V (1.62V-3.6V) | 1.62V-3.6V | 1.62V-3.6V | 1.62V-3.6V | 1.62V-3.6V | 1.62V-3.6V |
关键差异点
- CAN controller plus high-speed USB on one die （对比 ATSAM3S8CA-AU)
- Dual-bank 512KB flash for field updates （对比 ATSAM3S4CA-AU)
- Same footprint upgrade path with more flash-class options （对比 ATSAM3SD8CA-AU)
设计说明
The SAM3A uses separate VDDCORE and VDDIO supply domains, both within the 1.62V to 3.6V operating range per the Microchip datasheet. Decouple each supply pin with 100nF ceramic capacitors placed within 2mm of the pin, plus one 10uF bulk capacitor per domain. If core and I/O run at different rails, sequence VDDCORE before or with VDDIO to avoid latch-up risk. Estimated: at 84 MHz typical core current is in the tens of milliamps, so a small LDO such as the MCP1700 suffices for battery designs; verify against the datasheet power consumption tables for your clock configuration.
The 100-LQFP (14x14 mm) has 0.5mm pin pitch, which requires careful solder paste stencil design; use 1:1 aperture with 100-120um thickness to prevent bridging. Route the high-speed USB DP/DM pair as a 90-ohm differential pair with length matching better than 1mm, keeping them away from the 12MHz crystal. The crystal load capacitors must match the datasheet CL specification, and the crystal should sit within 5mm of the OSC pins with a ground guard ring for reliable PLL lock at 84 MHz.
Do not assume SAM3A and SAM3S 100-pin parts are interchangeable despite the identical package: peripheral muxing on shared pins differs, and the SAM3S lacks CAN and high-speed USB. Always cross-check the datasheet pin multiplexing tables before a board spin. Second, the dual-bank flash bootloader requires the GPNVM bits to be set correctly when migrating firmware between banks; an incorrect GPNVM state leaves the part running from the wrong bank after reset. Third, unused I/O should be grounded or driven, never left floating, to avoid excess current in EMI-sensitive industrial environments.
合规信息
Green package, industrial temperature per Mouser listing ('QFP100, GREEN IND TEMP'); -AU suffix denotes Microchip lead-free/RoHS package. REACH and halogen-free declarations not stated in available data - verify on Microchip compliance portal.