ATSAM3A8CA-CU
ATSAM3A8CA-CU - 84MHz Cortex-M3 MCU | Microchip Technology
Microchip Technology ATSAM3A8CA-CU is a 32-bit ARM Cortex-M3 microcontroller operating at up to 84 MHz, with 512 KB of Flash memory, 96 KB of SRAM, and a 100-TFBGA 9 x 9 mm package. It operates from 1.62 V to 3.6 V and integrates 12-bit ADC and DAC functions, a temperature sensor, 32-bit timers, PWM support, and an RTC. The connected product line also includes CAN, ISUP2C, IrDA, LIN, MMC, SPI, SSC, and UART/USART interfaces.
A microcontroller is a programmable semiconductor that integrates a processor core, nonvolatile program memory, volatile data memory, peripherals, and communication interfaces on one device. The ATSAM3A8C belongs to the SAM3A family of embedded microcontrollers and uses the ARM Cortex-M3 RISC architecture. Within the product hierarchy, it is an MCU, embedded controller, RISC processor, and system-on-chip for real-time control and connected applications.
The principal strengths of the ATSAM3A8CA-CU are its 84 MHz processing rate, 512 KB Flash organization, 96 KB SRAM, and broad set of mixed-signal and communications peripherals. The 12-bit ADC/DAC and integrated temperature sensor reduce the need for external sensing components in industrial monitoring designs. The dual-bank Flash organization and 64 KB plus 32 KB SRAM banking are useful for controlled firmware maintenance and memory-constrained real-time workloads.
The ARM Cortex-M3 revision 2.0 core includes a Memory Protection Unit, Thumb-2 instruction set, a 24-bit SysTick counter, and nested vector interrupt control. These features support deterministic interrupt handling, protected memory regions, and efficient embedded code execution. Connectivity includes CAN, ISUP2C, IrDA, LIN, MMC, SPI, SSC, and UART/USART, allowing the MCU to serve as the central controller for industrial, communications, and data-acquisition equipment.
Typical applications include industrial automation modules, CAN-connected controllers, motor and power-system control, communications equipment, environmental monitoring, and compact embedded gateways. In a CAN node, the integrated controller and transceiver interface logic simplify protocol handling. In a measurement system, the 12-bit ADC, temperature sensor, timers, and SRAM support concurrent sensing and control tasks.
The principal design consideration is the 100-TFBGA footprint: the device requires a multilayer PCB, fine-pitch assembly, and careful escape-routing before power, ground, high-speed signals, and analog inputs are assigned. Designers should also verify peripheral availability, pin multiplexing, operating-temperature limits, and transceiver requirements against the manufacturer datasheet before releasing a new PCB layout.
This page consolidates the verified distributor specifications, package information, memory characteristics, and connectivity details while clearly identifying engineering data that still requires datasheet confirmation. It also provides application-oriented guidance and same-package alternatives that help engineers evaluate migration without confusing compatibility with merely similar functionality.
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