ATSAM3S8CA-AU - 64MHz Cortex-M3 512KB Flash MCU | Microchip
N.º de pieza: ATSAM3S8CA-AU ✓ ActivoATSAM3S8CA-AU Descripción general
A microcontroller is an integrated circuit that combines a processor core, flash memory, SRAM, peripherals, and interface logic on one semiconductor device. The ATSAM3S8CA-AU belongs to the hierarchy ARM Cortex-M3 core, 32-bit RISC microcontroller, embedded microcontroller, and integrated circuit. Its 64 MHz operating speed supports responsive control loops, while 512 KB of flash stores firmware and 64 KB of SRAM supports working data, protocol stacks, and buffering.
The verified product data identifies the device as an ARM Cortex-M3 MCU with a maximum operating frequency of 64 MHz and 512K x 8 flash organization. Arrow additionally lists supported 1.8 V, 2.5 V, and 3.3 V operating voltages, allowing the same controller family to support multiple industrial and embedded supply rails. The package exposes 100 pins, providing access to the SAM3S peripheral set without requiring a smaller, pin-constrained variant.
Typical use cases include USB-connected data acquisition, industrial control and monitoring equipment, serial-interface gateways, and human-machine-interface controllers. The large flash capacity is particularly useful for applications that store configuration data, protocol handlers, and application code on the MCU rather than using external memory. An integrated ARM Cortex-M3 ecosystem also allows developers to use established compiler, debugger, and real-time operating-system workflows.
When laying out a board, verify every power, ground, decoupling, and high-speed signal connection against the official pin table before manufacturing. The 100-pin LQFP footprint has fine lead spacing, so accurate paste masks, adequate thermal relief, and assembly-process capability are essential. Software migration should also confirm peripheral mapping, interrupt priorities, clock-tree settings, and bootloader requirements; a mechanically similar package does not by itself guarantee application-level compatibility.
Alternativas directas para ATSAM3S8CA-AU — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATSAM3S8CA-AU (mismo factor de forma y huella) — difiere en Package, Flash Memory, Series, SRAM, RoHS Status.
ATSAM3S8CA-AUR
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ATSAM3S8CA-CU
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Ver hoja de datos →ATSAM3SD8CA-AU
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Ver hoja de datos →ATSAM3X8EA-AU
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Ver hoja de datos →ATSAM3X8EA-CU
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Ver hoja de datos →ATSAM3S8CA-AU Valores máximos y características eléctricas
| Manufacturer | Microchip Technology |
| Product Type | 32-bit ARM Cortex-M3 flash microcontroller |
| Processor Core | ARM Cortex-M3, revision 2.0 |
| Architecture | 32-bit RISC |
| Maximum CPU Frequency | 64 MHz |
| Flash Memory | 512 KB |
| Flash Organization | 512K x 8 |
| SRAM | 64 KB |
| Memory Protection Unit | Yes |
| Instruction Set | ARM Thumb-2 |
| Operating Voltage Options | 1.8 V, 2.5 V, 3.3 V |
| Encapsulado | 100-pin LQFP (14 x 14 mm) |
| Tipo de montaje | Surface Mount |
| Series | SAM3S |
| Interface Focus | High-speed USB and integrated transceiver |
Guía de configuración de pines de ATSAM3S8CA-AU 100-pin lqfp (14 x 14 mm)
Configuración de pines para ATSAM3S8CA-AU (encapsulado 100-pin lqfp (14 x 14 mm)). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para ATSAM3S8CA-AU.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
ATSAM3S8CA-AU es adecuado para 6 aplicacións: USB-Connected Data Acquisition, Industrial Control and Monitoring, Serial Communication Gateway, Human-Machine Interface Controller, Power-Supply Controller, Automotive or Asset-Tracking Terminal.
USB-Connected Data Acquisition
The ATSAM3S8CA-AU fits USB-connected acquisition equipment because its verified feature set includes high-speed USB and an integrated transceiver, while the 64 MHz ARM Cortex-M3 core provides processing capacity for buffering and protocol handling. Its 512 KB of flash accommodates USB firmware, configuration structures, and application code, and the 64 KB of SRAM reduces the need for external memory during short acquisition bursts. Place the device in a design that exposes the required USB pins, routes differential pairs with controlled impedance, and provides the specified transceiver and core supply rails. The integrated transceiver can simplify the physical layer, although board-level EMI margins, cable length, grounding, and firmware retry behavior still determine real-world reliability.
Recomendado
Industrial Control and Monitoring
The ATSAM3S8CA-AU is suitable for industrial monitoring and machine-control modules that combine several peripheral functions with substantial local firmware storage. Its verified 512 KB flash provides room for communication stacks, logging, parameter tables, and field-upgrade logic, while the 64 MHz Cortex-M3 core supports responsive control tasks. The listed 1.8 V, 2.5 V, and 3.3 V operating options also support mixed industrial supply environments. Designers should reserve the pins used by the application’s required communication and sensing interfaces, confirm the industrial temperature variant, and separate sensitive analog channels from switching nodes. Firmware isolation, watchdog use, and brownout handling are important when the controller must continue safe machine operation during supply disturbances.
Recomendado
Serial Communication Gateway
The ATSAM3S8CA-AU can act as a protocol-conversion gateway where a 64 MHz 32-bit core and 512 KB of code space are more valuable than a minimal MCU footprint. Multiple UART, SPI, or serial-interface resources can be assigned as needed from the device’s extensive 100-pin peripheral set, with the 64 KB of SRAM supporting buffering between differently paced networks. The large LQFP package also makes multiple independent interfaces more accessible than in compact 32-pin controllers. For reliable gateway operation, define UART electrical levels through external transceivers, use separate routing for clocked and asynchronous signals, and reserve storage for nonvolatile configuration. Because the supplied data does not enumerate peripheral counts, verify the exact peripheral mix and pin multiplexing in the official data sheet before finalizing the schematic.
Recomendado
Human-Machine Interface Controller
The ATSAM3S8CA-AU suits a human-machine interface controller that must coordinate display updates, keypad input, communications, and local configuration. Its 512 KB flash can hold graphical resources, multilingual strings, protocol handlers, and application firmware, while the 64 MHz ARM Cortex-M3 core allows responsive UI state management without requiring a separate processor. The 100-pin package exposes more I/O than a small MCU, allowing display interfaces, touch or keypad scanning, and communications to coexist. Place decoupling close to each supply pin and keep display-bus switching away from sensitive communication lines. Validate timing for the selected display controller, add pull resistors only where required by its interface specification, and reserve enough flash for rollback images if field updates are supported.
Recomendado
Power-Supply Controller
The ATSAM3S8CA-AU can supervise a multi-rail power system because the verified 64 MHz processor and 512 KB flash allow the controller to combine sequencing, telemetry, fault logging, and communications in one device. The 1.8 V, 2.5 V, and 3.3 V operating options let the controller sit on several logic rails while monitoring external power stages. Assign enable and fault signals with adequate isolation from high-current switching nodes, and use the MCU’s own supply rails only after verifying the control-domain voltage against the official operating conditions. Firmware should default outputs to a safe state during reset, validate every feedback signal before enabling a stage, and store fault codes in nonvolatile memory. A hardware watchdog and deliberate brownout behavior remain important even when software performs the primary sequencing.
Recomendado
Automotive or Asset-Tracking Terminal
The ATSAM3S8CA-AU fits compact asset-tracking or automotive-adjacent terminals that need local processing, USB connectivity, and room for application firmware. The 64 MHz Cortex-M3 core supports protocol and sensor fusion tasks, and the 512 KB flash allows storage of route logic, device identifiers, and update packages. The verified listing identifies an industrial-temperature ordering option rather than confirming automotive qualification, so it must not be assumed AEC-Q100 qualified for safety-critical vehicle positions. Use a rugged power supply, controlled USB routing, and an external real-time clock when accurate timestamps are needed. Firmware should protect stored calibration and identity data, monitor supply excursions, and support authenticated recovery if the terminal is expected to operate unattended in the field.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATSAM3S8CA-AU — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Use ATSAM3S8CA-AUR when procurement requires reel-based ordering and the electrical ordering details are confirmed identical. Consider ATSAM3S8CA-CU when its ordering suffix is appropriate for the intended grade or distribution channel. ATSAM3SD8CA-AU is a related same-family migration candidate, but its exact peripheral differences must be checked. ATSAM3X8EA-AU or ATSAM3X8EA-CU should be selected only when the listed 84 MHz speed is advantageous and a complete pin, peripheral, clock, and firmware migration has been performed. None of these related parts should be substituted solely because the LQFP land pattern appears identical.
Comparación con alternativas
| Parámetro | Este producto | ATSAM3S8CA-AUR | ATSAM3S8CA-CU | ATSAM3SD8CA-AU | ATSAM3X8EA-AU | ATSAM3X8EA-CU |
|---|---|---|---|---|---|---|
| Package | 100-LQFP (14 x 14 mm) | 100-LQFP (14 x 14 mm) | 100-LQFP (14 x 14 mm) | 100-LQFP (14 x 14 mm) | 100-LQFP (14 x 14 mm) | 100-LQFP (14 x 14 mm) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Processor Core | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 | ARM Cortex-M3 |
Diferenciadores clave
- Matches the specified 64 MHz performance without a clock-rate increase (frente a ATSAM3X8EA-AU)
- Provides a verified 512 KB flash configuration with 64 KB of SRAM (frente a ATSAM3X8EA-AU)
- Uses the established ATSAM3S8C family feature set (frente a ATSAM3SD8CA-AU)
Notas de diseño
Treat the 100-pin LQFP footprint as a fine-pitch assembly problem. Verify the land pattern against the official package drawing, use a manufacturer-recommended or IPC-classified land pattern, and confirm the PCB fabricator's minimum trace and spacing capability. Place decoupling capacitors near the applicable supply pins, provide adequate ground-plane continuity, and avoid thermal isolation around the device. Because the verified listings do not include the complete pin table, engineers must not assign power or I/O signals from distributor summaries alone.
USB routing should follow the Microchip ATSAM3S8C hardware and layout guidance. Route the differential pair as a controlled-impedance pair with continuous reference plane, minimize vias and stubs, and place any required series termination close to the driver. Keep the connector and transceiver return path short, provide a solid ground reference, and keep switching regulators and their high-current loops away from the USB region. Validate eye opening, rise time, and radiated emissions on the assembled board rather than inferring USB performance from the nominal 64 MHz CPU speed.
Do not treat a mechanically similar 100-LQFP Microchip MCU as automatically interchangeable. The ATSAM3X8EA candidates are listed at 84 MHz rather than 64 MHz, and device suffixes may encode different temperature grades or ordering conditions. Before substitution, compare the official pin-multiplexing table, peripheral instance numbers, interrupt mapping, power pins, clock pins, bootloader behavior, and package drawing. Firmware should also be recompiled and retested because clock-tree and peripheral differences can invalidate an otherwise successful PCB fit.
The verified Arrow listing states support for 1.8 V, 2.5 V, and 3.3 V operation, but this does not imply that every peripheral or interface is operational at every listed voltage. Confirm the complete voltage-versus-frequency and peripheral-availability tables in the official data sheet. Provide local decoupling, separate sensitive analog supplies if required, and define safe reset states for external loads. Firmware should enable rails in the documented sequence and use brownout or watchdog mechanisms to prevent unintended outputs during unstable supply conditions.
Información de cumplimiento
The supplied distributor snippets identify the part as a green industrial-temperature MCU but do not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. Compliance fields are therefore left as unknown rather than inferred.