ATSAM3A4CA-CU - 84MHz Cortex-M3 MCU 256KB Flash | Microchip
MPN： ATSAM3A4CA-CU ✓ 啟用中ATSAM3A4CA-CU 概覽
A microcontroller unit (MCU) is a single-chip embedded computer that integrates a processor core, program memory, data memory, and peripherals such as timers, serial interfaces, and analog blocks. MCUs sit at the device level of the embedded-systems hierarchy - below system-on-chip (SoC) and application processors - and the SAM3A belongs to the broader ARM Cortex-M family of 32-bit microcontroller cores, which in turn belongs to the ARM architecture ecosystem.
Key features include the ARM Cortex-M3 revision 2.0 core executing the Thumb-2 instruction set, a Memory Protection Unit (MPU), a 24-bit SysTick counter, and a Nested Vectored Interrupt Controller (NVIC) for deterministic interrupt latency. The dual-bank flash architecture enables safe in-application programming, while the dual-bank SRAM supports efficient DMA transfers without bus contention. Peripherals cover automotive-relevant connectivity: two CAN controllers, USART with ISO7816, IrDA and LIN support, SPI, SSC (I2S audio), TWI (I2C-compatible), and an MMC/SD memory card interface.
The device operates from a 1.62V to 3.6V single supply (typical 1.8V, 2.5V, or 3.3V rails) across an industrial temperature range, and the CU suffix denotes a RoHS-compliant, halogen-free green package. The 9x9 mm 100-ball TFBGA footprint delivers high I/O density for compact industrial PCBs.
Typical applications include industrial automation nodes, CAN networking gateways, motor control and power-conversion supervisory systems, and embedded HMI or data-logging equipment.
When designing with the ATSAM3A4CA-CU, budget the BGA footprint carefully: 0.8 mm ball pitch requires controlled-impedance routing for CAN and SSC signals, and the power distribution network should include decoupling per the SAM3X/SAM3A datasheet power-rail guidance.
This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 ATSAM3A4CA-CU — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ATSAM3A4CA-CU （相同外形與佔位） — 差異在於 Package, Flash Memory, Series, Connectivity, SRAM.
ATSAM3A4CA-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3A8CA-CU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →ATSAM3X4CA-CU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3S4CA-CUR
✅ 直接替換📋 參考替代品（不在目錄中）
ATSAM3U2CA-CU
✅ 直接替換聯絡詢價
查看資料表 →ATSAM3A4CA-CU 最大額定值與電氣特性
| Core Processor | ARM Cortex-M3 revision 2.0 |
| Core Size | 32-bit, single-core |
| Maximum Clock Speed | 84 MHz |
| Flash Memory | 256KB (256K x 8), 2 x 128KB banks |
| SRAM | 64KB, 2 x 32KB banks |
| Supply Voltage Range | 1.62 V to 3.6 V (1.8 V / 2.5 V / 3.3 V typical) |
| Connectivity | CAN, I2C (TWI), IrDA, LIN, MMC/SD, SPI, SSC, UART/USART |
| Instruction Set | Thumb-2 |
| Memory Protection | MPU (Memory Protection Unit) |
| SysTick Timer | 24-bit |
| Interrupt Controller | NVIC (Nested Vectored Interrupt Controller) |
| 封裝 | 100-TFBGA (9 x 9 mm) |
| 安裝類型 | Surface Mount |
| 工作溫度 | -40C to +85C (industrial) |
| RoHS 狀態 | Compliant (green package) |
| Series | SAM3A |
ATSAM3A4CA-CU 100-tfbga (9 x 9 mm) 腳位配置指南
ATSAM3A4CA-CU（100-tfbga (9 x 9 mm) 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： ATSAM3A4CA-CU.
請參閱 資料表 以查看完整腳位配置。
典型應用
ATSAM3A4CA-CU 適用於 6 應用s: Industrial CAN Networking Nodes, Motor Control and Power Conversion Supervision, Embedded Data Loggers, Human-Machine Interface (HMI) Panels, Gateways and Protocol Converters, Building Automation Sensors and Actuators.
Industrial CAN Networking Nodes
The ATSAM3A4CA-CU is well suited for industrial CAN nodes because its SAM3A peripheral set centers on dual CAN controllers alongside SPI, TWI, and USART with LIN support, all serviced by a DMA controller and dual 32KB SRAM banks. At 84 MHz the Cortex-M3 core handles CANopen or DeviceNet protocol stacks with significant headroom, while the MPU enables functional partitioning of stack and application memory. Deployed as a sensor or actuator node between a 24V industrial bus and the CAN physical layer, the MCU runs from a 3.3V rail derived by a buck converter (for example, Microchip MCP16331) with a CAN transceiver on the CAN pins. The dual-bank flash permits field firmware updates over CAN without an external programmer.
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Motor Control and Power Conversion Supervision
In motor drives and power converters, the ATSAM3A4CA-CU supervises the control loop front end: its SSC and timer resources generate PWM timing references, the 12-bit ADC-free SAM3A architecture pairs with external precision ADCs over SPI for current and voltage sampling, and the CAN interface reports status to a higher-level drive controller. The 84 MHz Cortex-M3 with Thumb-2 executes PIDs and state machines deterministically under the NVIC, and the 64KB SRAM buffers fault logs and telemetry. Designers typically allocate one SRAM bank to DMA circular buffers and the other to the application stack, avoiding contention. The 1.62V-3.6V supply tolerance allows direct operation from 3.3V logic rails shared with gate-driver logic.
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Embedded Data Loggers
The integrated MMC/SD card interface (MCI) makes the ATSAM3A4CA-CU a natural fit for embedded data loggers writing sensor streams to SD media. The DMA controller moves ADC or USART-received samples into SRAM without CPU intervention, and the 84 MHz core supports filesystem middleware such as FatFS with real-time margins. Dual-bank flash enables logging-application updates in the field, and the industrial -40C to +85C range suits unheated cabinets and outdoor enclosures. Typical designs clock the MCI at up to tens of MHz for multi-megabyte-per-second write throughput, buffering through one 32KB SRAM bank while the application runs from the other bank and executes from flash.
推薦
Human-Machine Interface (HMI) Panels
For compact HMI panels, the ATSAM3A4CA-CU drives character/graphical LCD or OLED modules over its parallel or serial buses, reads keypads and rotary encoders through its PIO controller, and communicates with a PLC or host over CAN or USART. The 256KB flash accommodates a lightweight GUI framework plus localization string tables, while the 64KB SRAM holds framebuffer regions for small displays (for example, 128x64 monochrome panels fit comfortably in a single SRAM bank). The 100-TFBGA 9x9 mm package keeps board area small for behind-panel mounting, and Thumb-2 code density reduces flash pressure relative to ARM7-class parts historically used in HMI retrofits.
推薦
Gateways and Protocol Converters
The ATSAM3A4CA-CU bridges field buses as a protocol converter: dual CAN plus multiple USARTs, SPI, TWI, and SSC let one device translate between CAN, Modbus-over-RS-485 (via a LIN/USART-capable transceiver), and serial sensor protocols simultaneously. The NVIC prioritizes time-critical CAN reception over background UART parsing, and the 24-bit SysTick provides a stable timebase for protocol timeouts. The 84 MHz core sustains aggregate throughput typical of industrial gateways handling a few thousand frames per second. Dual-bank SRAM separates DMA receive rings from protocol state, and the MPU can isolate the communication stack from application logic for safer field updates over CAN or serial bootloader.
推薦
Building Automation Sensors and Actuators
The ATSAM3A4CA-CU serves as the main controller in building automation end points such as damper actuators, VAV controllers, and environmental sensor boards. Its TWI (I2C-compatible) and SPI interfaces connect temperature, humidity, and pressure sensors, while CAN links the node to the building controller backbone. The 1.62V-3.6V supply range and low-power wait modes support nodes powered from limited 3.3V auxiliary supplies, and the industrial temperature rating covers rooftop and mechanical-room installations. The 256KB dual-bank flash stores a full application plus a CAN bootloader for remote reprogramming during commissioning, and the MPU partitions the network stack from control firmware to improve field reliability.
推薦
推薦產品摘要
工程參考資料，適用於 ATSAM3A4CA-CU — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ATSAM3A4CA-AU | ATSAM3A8CA-CU | ATSAM3X4CA-CU | ATSAM3S4CA-CUR | ATSAM3U2CA-CU |
|---|---|---|---|---|---|---|
| Package | 100-TFBGA (9x9) | 100-TFBGA (9x9) - same | 100-TFBGA (9x9) - same | 100-TFBGA - same family | 100-TFBGA - same family | 100-TFBGA - same family |
| 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 / 120 MHz class per SAM3S family | Cortex-M3 / 96 MHz class per SAM3U family |
| Flash | 256KB (2 x 128KB banks) | 256KB | 512KB | 256KB | 256KB | 128KB |
| SRAM | 64KB (2 x 32KB banks) | 64KB | 96KB | 96KB | 64KB | 32KB |
| Ethernet MAC | No | No | No | Yes | No | No |
主要差異化特點
- CAN-centric peripheral set for industrial networking (對比ATSAM3S4CA-CUR)
- Same-footprint flash upgrade path (對比ATSAM3A8CA-CU)
- Ethernet-ready sibling for networked variants (對比ATSAM3X4CA-CU)
設計說明
The 100-TFBGA (9x9 mm) uses a 0.8 mm ball pitch, requiring controlled BGA fanout - typically via-in-pad or dog-bone escape routing on 4+ layer PCBs. Allocate dedicated power/ground balls to solid planes and place at least one 100 nF ceramic decoupling capacitor per supply ball group within 2-3 mm of the package, plus bulk 10 uF at the regulator output, per the SAM3X/SAM3A datasheet power-supply recommendations. Route CANH/CANL as a 120-ohm differential pair and keep SSC/I2S clock lines away from the CAN pair to limit crosstalk.
SAM3A and SAM3X devices are closely related but not bit-identical: peripheral allocation, USB capability, and some ball functions differ between the families. Do not assume a SAM3X binary or ballout mapping transfers directly to the ATSAM3A4CA-CU. Verify the exact ball map in the SAM3X/SAM3A datasheet ballout tables, confirm clock-tree settings (PLL multipliers targeting 84 MHz), and re-test the flash write timing when porting code that performs in-application programming on the dual 128KB banks.
Power the ATSAM3A4CA-CU from a single 3.3V rail within the 1.62V-3.6V range, sequenced so VDDCORE/VDDIO rise together as described in the datasheet power-management section. Estimated: at 84 MHz typical core current on SAM3-class parts (tens of mA, exact figure [DATA_NEEDED: typical supply current]), a small LDO such as a 3.3V/150 mA part is sufficient for the MCU alone; budget additional current for CAN transceivers (roughly 40-50 mA) and SD-card write bursts (up to 100-200 mA) when sizing the upstream buck converter.
合規資訊
CU suffix denotes Microchip green package: RoHS compliant, halogen-free, lead-free. Mouser listing states BGA100 GREEN IND TEMP. REACH and conflict-minerals status not stated in provided data.
