AT91SAM7A2-AU - 30MHz ROMless ARM7 MCU | Microchip | LQFP
Артикул: AT91SAM7A2-AU ✗ Снят с производстваAT91SAM7A2-AU Обзор
An ARM7-based microcontroller is a 32-bit reduced-instruction-set-computing control device whose Thumb instruction mode supports compact 16-bit code while its 32-bit instruction set handles more complex operations. In the product hierarchy, the AT91SAM7A2-AU is a microcontroller, embedded processor, semiconductor, and programmable control component. It sits above general-purpose computing because its peripherals, interrupt structure, and embedded debug interface are tailored to industrial, communications, and real-time equipment.
Principal features include a 30 MHz maximum operating frequency, 16 KB of internal RAM, 57 general-purpose I/O lines, and an integrated 10-bit ADC interface. The device provides PWM channels, USART-based serial communications, and an ARM7TDMI-class RISC core. Its 176-LQFP package exposes substantially more I/O and peripheral connections than small leaded packages, making the device suitable for systems that need broad external connectivity while retaining a conventional leaded package for inspection and assembly.
The ROMless architecture is the most important engineering distinction. Because the AT91SAM7A2-AU does not provide a complete application program in its internal Flash, a boot system must load firmware into external memory before normal execution. This arrangement can separate boot code from the main application, permit controlled recovery or firmware updates, and allow the same microcontroller target to support different storage configurations. System designers must therefore budget for external memory, address-bus correctness, startup code, and sufficient flash endurance for the selected update strategy.
Typical uses include industrial controllers, serial gateways, data acquisition equipment, building-control interfaces, and embedded access systems. The 57 I/O lines support multiple sensors, actuators, communications ports, and status indicators without requiring a companion I/O expander in moderate-complexity designs. The ADC supports analog measurement, while the USART and PWM resources suit sensor monitoring, actuator control, and supervisory communications. The large LQFP footprint is advantageous for prototype accessibility but requires a 176-lead PCB layout and careful consideration of assembly cost.
When designing around this device, verify the external-memory interface, boot configuration, pin multiplexing, and signal levels before committing the PCB. Because the part is ROMless, firmware storage and the boot sequence are part of the system architecture rather than optional software details. A legacy ARM7 design should also include the appropriate debugger, startup routines, clock configuration, and memory timing for the selected external devices.
This product overview combines the exact orderable MPN, package and core details, practical firmware considerations, and qualified replacement guidance for engineers evaluating an obsolete ARM7 control platform. It also distinguishes true drop-in interchangeability from newer Cortex-M devices that may provide similar peripherals but require different firmware, package layouts, and board resources.
Аналоги без доработки для AT91SAM7A2-AU — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Для этого товара нет аналогов без доработки.
Запросить аналогиAT91SAM7A2-AU Максимальные параметры и электрические характеристики
| Product Type | 16/32-bit ARM7 RISC microcontroller |
| Maximum Operating Frequency | 30 MHz |
| Architecture | ARM7TDMI with 16/32-bit instruction set |
| Internal RAM | 16 KB |
| Internal High-Speed Flash | 64 KB organized in 512 pages |
| General-Purpose I/O Lines | 57 |
| Корпус | 176-LQFP (24 mm x 24 mm) |
| Тип монтажа | Surface mount |
| Program Memory Architecture | ROMless |
| Debug Support | Embedded ICE and Debug Communication Channel |
| ADC | 10-bit integrated ADC |
Руководство по цоколевке AT91SAM7A2-AU в корпусе 176-lqfp (24 mm x 24 mm)
Цоколевка для AT91SAM7A2-AU (корпус 176-lqfp (24 mm x 24 mm)). Эта цифровая ИС включает выводы GPIO, интерфейсы связи (UART, SPI, I2C) и выводы питания. Обратитесь к техническому описанию производителя для альтернативных функций выводов и вариантов конфигурации. Необходимо для проектирования встраиваемых систем и трассировки печатных плат.
Нет подробных данных о распиновке для AT91SAM7A2-AU.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
AT91SAM7A2-AU подходит для 6 применениеs: Industrial Automation Controller, Serial Communication Gateway, Data Acquisition System, Building Control Interface, Motor and Actuator Control, Embedded Access and Security Controller.
Industrial Automation Controller
AT91SAM7A2-AU fits an existing industrial automation controller that depends on 57 general-purpose I/O lines, a 30 MHz ARM7 control core, integrated ADC resources, and serial communications. The 176-LQFP package provides access to a broad peripheral set without adding a separate I/O expander, while the 16 KB of RAM supports real-time control state. Because the microcontroller is ROMless, the design must retain or recreate its established external-memory boot arrangement. This is most appropriate for lifecycle maintenance of proven equipment rather than a new platform based on an obsolete processor architecture.
Рекомендуется
Serial Communication Gateway
AT91SAM7A2-AU is suitable for a legacy serial gateway when the board already uses its 176-LQFP footprint and ARM7 firmware environment. Its 30 MHz ARM7 core can service protocol handling, while the 57 I/O lines support status indicators, modem control, and multiple peripheral connections. The 16 KB of internal RAM is sufficient for bounded protocol buffering, but larger frame buffers may require external memory. A system designer must preserve the established startup code and external bus timing, and should verify that every UART, interrupt, and handshake signal remains compatible with the existing board.
Рекомендуется
Data Acquisition System
AT91SAM7A2-AU can serve in a legacy data-acquisition system where analog monitoring, digital status capture, and moderate control processing share one microcontroller. The integrated 10-bit ADC and 57 I/O lines reduce the peripheral count required for sensor inputs, while the 30 MHz ARM7 core supports acquisition sequencing and host communication. Resolution and channel-count limits must be checked against the measurement chain during design review. For a new instrument, a current MCU with higher-resolution ADCs, more memory, and active tooling support will usually simplify calibration and long-term maintenance.
Рекомендуется
Building Control Interface
AT91SAM7A2-AU is appropriate for maintaining an existing building-control interface whose controller combines sensor inputs, relay outputs, communications, and scheduled logic. The 57 general-purpose I/O lines allow multiple digital channels to be handled locally, and the 30 MHz ARM7 performance supports responsive control without a separate processor. PWM outputs can support compatible actuator drives, but load drivers and isolation must remain external to the microcontroller. Because the part is obsolete, new building-control designs should instead use a current MCU family with integrated Flash and a supported development path.
Рекомендуется
Motor and Actuator Control
AT91SAM7A2-AU can control auxiliary actuators in a legacy embedded system because its PWM resources, ADC inputs, and 57 I/O lines support feedback capture and command generation. The 30 MHz ARM7 core can coordinate motor-control sequencing and external communication, although the LQFP device does not replace a dedicated high-performance motor-control IC for demanding field-oriented control. External gate drivers, current sensing, protection, and bulk filtering remain required. Engineers should preserve the original timing and pin-mux configuration and verify thermal margins in the final enclosure.
Рекомендуется
Embedded Access and Security Controller
AT91SAM7A2-AU is usable in a legacy access-control unit where an ARM7 controller manages reader inputs, indicators, relays, and a network or host interface. Its 57 I/O lines provide practical capacity for multiple credential readers, door-position inputs, and control outputs. The 16 KB of RAM is adequate for bounded protocol and state handling, but audit buffering or encrypted firmware storage may require external components. Because this MCU is obsolete and ROMless, security updates require a controlled bootloader and durable external storage rather than simple in-field flash replacement.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для AT91SAM7A2-AU — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар |
|---|---|
| Package | 176-LQFP (24 mm x 24 mm) |
| Brand | Microchip Technology |
| Maximum Frequency | 30 MHz |
| Processor Core | ARM7 RISC |
| Internal RAM | 16 KB |
| Internal High-Speed Flash | 64 KB organized in 512 pages |
| General-Purpose I/O | 57 lines |
| Program Memory Architecture | ROMless |
| ADC | Integrated 10-bit ADC |
| Lifecycle Status | Obsolete |
Ключевые отличия
- Legacy ARM7 control platform with extensive parallel I/O (против ATSAM3S4BA-AU)
- Dedicated 176-lead external-interface package (против ATSAM3S4BA-AU)
- Existing ARM7 software continuity (против ATSAM4S4BA-UU)
Заметки по проектированию
Design the external-memory and I/O power rails around the exact operating limits in the manufacturer datasheet. The 176-LQFP device has numerous power and ground pins that must all be connected according to the package drawing. Place bulk and high-frequency decoupling at the relevant supply pins, maintain short return paths, and keep switching-node currents away from the 30 MHz clock and ADC reference area. Confirm external-device voltage levels against the MCU's I/O limits rather than assuming compatibility from the logic family name.
Allocate the complete 176-LQFP footprint and verify pin-1 orientation against the manufacturer package drawing. Because the MCU is ROMless, preserve the external address, data, and control routing associated with the original boot mechanism. Route the external-memory bus according to the timing requirements of the connected device and avoid long unprotected branches where practical. If the PCB is being reused rather than newly designed, inspect solder joints and lead deformation before applying the obsolete part.
Do not treat a related ARM7 or Cortex-M device as a drop-in replacement without a manufacturer-confirmed pin map and electrical comparison. Processor architecture, startup code, interrupt vectors, timer registers, and memory organization can differ even when peripheral names appear similar. AT91SAM7A2-AU is obsolete, so preserve the original firmware toolchain, debugger configuration, startup files, and external bootloader during maintenance. Validate a proposed alternative on hardware before committing it to production.
Keep the main clock routing short and away from ADC inputs, switching regulators, and external-memory address lines. Use a continuous ground reference beneath the device where the board stack-up permits, and provide local return paths for high-frequency signals. When using the ADC, place the analog source and its conditioning network away from digital clocks and PWM outputs. Series damping at exposed long interconnects can help control ringing, but the final values should be established from measured edge behavior.
Информация о соответствии
The AT91SAM7A2-AU is a legacy industrial microcontroller, but RoHS, REACH, halogen-free, lead-free, and conflict-minerals declarations are not stated in the accessible product information. AEC-Q100 is marked not applicable because this is an industrial MCU rather than an automotive-qualified variant.
