ATSAM3N4AA-AU

Overview

The ATSAM3N4AA-AU is a 32-bit microcontroller based on the ARM Cortex-M3 core, operating at a maximum frequency of 48 MHz. It features 256 KB of flash memory and 24 KB of SRAM. The device supports a supply voltage range of 1.62 V to 3.6 V and includes an internal oscillator. Connectivity options include I2C, IrDA, SPI, and UART/USART interfaces. It provides 34 general-purpose I/O pins and integrates peripherals such as DMA, PWM, WDT, and brown-out detection/reset circuits. The component is housed in a 48-LQFP package with dimensions of 7x7 mm.

Feature Summary

• Integrates an ARM Cortex-M3 processor with Thumb-2 instruction set support for efficient code execution.
• Includes embedded flash memory with hardware acceleration and single-plane architecture for program storage.
• Supports capacitive touch sensing applications through compatibility with QTouch library implementations.
• Features multiple communication interfaces including USART, UART, TWI, and SPI for versatile system connectivity.

Applications

• Migration from 8-bit or 16-bit microcontrollers to 32-bit architectures
• General-purpose embedded control systems
• Low-cost industrial automation modules

Procurement Notes

Verify the specific manufacturer designation, as production may be attributed to Microchip Technology following corporate acquisitions. Confirm the exact package marking and revision level against current datasheets to ensure compatibility with existing board layouts. Check for any product change notifications regarding assembly sites or material composition updates that may affect long-term sourcing strategies.

Selection Notes

Select this component when 256 KB of flash and 24 KB of RAM are required within a compact 48-pin form factor. Ensure the application operates within the specified 1.62 V to 3.6 V voltage range. Consider the 48 MHz clock speed for processing requirements and verify that the available I/O count meets interface needs. Evaluate thermal performance for the -40°C to 85°C operating temperature range.

Part Context

This part belongs to the SAM3N series, which serves as an entry-level family of Flash microcontrollers. The series is designed for cost-sensitive applications requiring migration paths from lower-performance architectures. It shares pin compatibility with the SAM3S series, facilitating design reuse across different memory configurations within the same ecosystem.

Replacement Considerations

Consult official documentation for direct substitutes within the SAM3N family, such as variants with differing flash capacities like ATSAM3N2AA-AU or ATSAM3N1AA-AU. Verify pin-to-pin compatibility and software register mapping before implementing any cross-model replacements.