AT91SAM7A3-AU 60MHz ARM7 MCU 256KB Flash 100-LQFP
MPN： AT91SAM7A3-AU ✗ 停產AT91SAM7A3-AU 概覽
An ARM7 microcontroller combines a 32-bit reduced-instruction-set-computing processor with integrated memory and peripherals for embedded control systems. The AT91SAM7A3 architecture combines the ARM7TDMI core with high-speed Flash, SRAM, CAN connectivity, ADC support, timers, and serial interfaces. This hierarchy places the device within the broader category of microcontrollers, embedded processors, and semiconductor components used in industrial, automotive, medical, and communications equipment.
The AT91SAM7A3-AU provides 256 KB of high-speed internal Flash and 32 KB of SRAM, allowing firmware and working data to be stored on-chip while reducing external component count. The device operates at up to 60 MHz and includes two 2.0B full CAN controllers, a 10-bit ADC, timers, and multiple serial communication channels. Embedded ICE and Debug Communication Channel support assist development, debugging, and production programming.
The AT91SAM7A3 combines a high-performance 32-bit RISC processor with a high-density 16-bit Thumb instruction set. Its integrated CAN capability is useful for networked industrial and automotive control systems, while the ADC supports analog signal acquisition in sensor, measurement, and medical equipment. The 100-LQFP package provides the physical interface required for these mixed signal and communication functions.
Typical applications include automotive control modules, industrial automation equipment, medical monitoring systems, CAN-connected embedded controllers, and communications equipment. The integrated CAN controllers are particularly useful when a design requires reliable network communication without adding discrete CAN transceivers, although external transceiver and protection components are still required for physical-layer implementation.
Designers should account for the device’s supply voltage limits, peripheral pin multiplexing, clock configuration, and memory map when laying out a PCB. The 100-LQFP footprint should be checked against the manufacturer pin description table before assigning signals. External decoupling, oscillator components, programming access, and CAN transceiver interfaces should follow the reference design guidance in the AT91SAM7A3 documentation.
This page combines the verified product characteristics, manufacturer-datasheet information, package details, application guidance, and documented replacement considerations to support faster engineering evaluation and sourcing.
直接替換替代品，適用於 AT91SAM7A3-AU — 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： AT91SAM7A3-AU （相同外形與佔位） — 差異在於 Package, Operating Temperature, SRAM, USB.
AT91SAM7S64C-AU
✅ 直接替換📋 參考替代品（不在目錄中）
AT91SAM7S128-MU
✅ 直接替換📋 參考替代品（不在目錄中）
AT91SAM7A3-AU 最大額定值與電氣特性
| Product Type | 32-bit ARM7TDMI microcontroller |
| 最大時脈頻率 | 60 MHz |
| Internal Flash Memory | 256 KB |
| Internal SRAM | 32 KB |
| CAN Controller Count | 2 full CAN controllers |
| ADC Resolution | 10 bits |
| 封裝 | 100-LQFP, 14 mm x 14 mm |
| Processor Core | ARM7TDMI |
| Instruction Set | 32-bit RISC with 16-bit Thumb instructions |
| Debug Support | Embedded ICE and Debug Communication Channel |
| Serial Communication | Multiple serial communication channels |
| Timer Support | Integrated timers |
| 安裝類型 | Surface mount |
AT91SAM7A3-AU 100-lqfp, 14 mm x 14 mm 腳位配置指南
AT91SAM7A3-AU（100-lqfp, 14 mm x 14 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： AT91SAM7A3-AU.
請參閱 資料表 以查看完整腳位配置。
典型應用
AT91SAM7A3-AU 適用於 6 應用s: Automotive Embedded Control, Industrial Automation Controller, CAN Networked Sensor Node, Medical Monitoring Equipment, Communications Equipment, Data Acquisition and Test Systems.
Automotive Embedded Control
The AT91SAM7A3-AU fits automotive embedded-control prototypes that need deterministic 32-bit processing, local Flash and SRAM, and CAN connectivity in one device. Its 60 MHz ARM7TDMI core supports responsive control-loop and communication tasks, while 256 KB of Flash provides room for application firmware and 32 KB of SRAM handles working state. The two integrated 2.0B full CAN controllers suit vehicle-network designs, although each bus still requires a suitable transceiver and protection network. Engineers should verify the exact electrical ratings, temperature range, and automotive qualification status before releasing a production design.
推薦
Industrial Automation Controller
The AT91SAM7A3-AU is appropriate for industrial automation controllers that combine sensor acquisition with network communication and real-time control. Its 10-bit ADC can digitize suitable analog process signals, while the two full CAN controllers support distributed machine control and diagnostics. The 60 MHz ARM7TDMI processor allows firmware to combine communication handling with control algorithms, and the integrated 256 KB Flash and 32 KB SRAM simplify compact controller designs. For deployment, the board must include suitable regulator, clock, isolation or transceiver, and protection components, and the firmware should validate timing and analog accuracy against the plant requirements.
推薦
CAN Networked Sensor Node
The AT91SAM7A3-AU can serve as the central controller in a CAN-connected sensor node because it combines an ADC, timers, serial channels, and two CAN controllers on one monolithic device. A sensor front end can feed the 10-bit ADC, while control and filtering software run on the 60 MHz ARM7TDMI core. The 256 KB Flash supports local configuration, filtering, logging, and protocol firmware, while 32 KB SRAM supports working buffers. Designers should use the manufacturer’s clock and decoupling guidance, budget CAN bus termination externally, and confirm that the ADC resolution and channel count satisfy the measurement specification.
推薦
Medical Monitoring Equipment
The AT91SAM7A3-AU is suitable for compute-intensive embedded monitoring systems where a local processor, memory, ADC, and CAN connectivity are useful. The 60 MHz ARM7TDMI core can execute measurement control, data filtering, and communication routines, while the 256 KB Flash and 32 KB SRAM avoid unnecessary external memory in compact instruments. The ADC can support basic analog acquisition, although medical applications may require higher resolution, isolation, and validated safety measures. The device’s medical-market positioning is described in the datasheet, but production use requires review of electrical limits, qualification, calibration, and applicable regulatory requirements.
推薦
Communications Equipment
The AT91SAM7A3-AU supports communications-oriented embedded modules that require both serial connectivity and CAN network management. Its multiple serial communication channels, two full CAN controllers, timers, and 60 MHz processor provide resources for protocol conversion, supervisory control, and data routing. The 256 KB internal Flash can hold firmware and configuration data, while 32 KB SRAM supports protocol state and packet buffers. Board-level design still requires the appropriate line drivers or transceivers, clocking, power conversion, and signal-integrity layout. Firmware compatibility must be reassessed if the original design depends on a different MCU or peripheral arrangement.
推薦
Data Acquisition and Test Systems
The AT91SAM7A3-AU can be used in compact data-acquisition and test equipment where a 60 MHz control processor, 10-bit ADC, timers, and multiple communication interfaces are needed in one package. Firmware can coordinate sampling, maintain control loops, process captured values, and transfer results through serial or CAN links. Integrated Flash and SRAM make the device useful for standalone instruments where compactness is important. For laboratory accuracy requirements, an external precision ADC may be preferable. Engineers should also account for analog grounding, reference-voltage quality, clock jitter, input protection, and calibration when interpreting measured results.
推薦
推薦產品摘要
工程參考資料，適用於 AT91SAM7A3-AU — 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 | AT91SAM7S64C-AU | AT91SAM7S128-MU |
|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
主要差異化特點
- Higher internal memory capacity than the identified related alternative (對比AT91SAM7S64C-AU)
- Higher documented maximum clock frequency (對比AT91SAM7S64C-AU)
- Integrated dual full CAN controller support (對比AT91SAM7S128-MU)
設計說明
Before routing the 100-LQFP footprint, assign every pin from the manufacturer pin-description table and preserve the package-specific land pattern. Pay particular attention to power, ground, reset, clock, debug, and peripheral alternate-function pins. The verified distributor listing confirms the 100-LQFP package and 14 mm x 14 mm body size, but a production board should use the dimensional drawing and recommended footprint from the manufacturer documentation.
Follow the datasheet’s supply-voltage and decoupling recommendations, placing the required bulk and high-frequency capacitors close to the associated supply pins. Confirm regulator headroom against the MCU operating limits before layout release. Power sequencing, reset behavior, and CAN transceiver supply requirements should be evaluated as a complete system rather than as isolated IC requirements.
Keep sensitive analog and communication routing away from noisy switching nodes and maintain the layout recommended for the ADC, oscillator, and debug interfaces. For CAN implementations, provide a controlled return path and place protection and transceiver circuitry according to the selected bus topology. The integrated CAN controller does not include the physical transceiver, so external signal conditioning remains essential.
Do not treat related SAM7 devices as automatic drop-in replacements. The verified comparisons show materially different Flash, SRAM, and clock configurations for AT91SAM7S64C-AU, while package and peripheral differences must be checked for every alternative. Verify startup code, peripheral multiplexing, memory placement, interrupt vectors, and programming procedures before replacing AT91SAM7A3-AU in an existing design.
合規資訊
Compliance status was not stated in the verified product information. The automotive, medical, and industrial applications identified in the AT91SAM7A3 datasheet do not by themselves establish AEC-Q100 qualification or current compliance declarations.