ATSAM3N2BA-AU

Overview

The ATSAM3N2BA-AU is a 32-bit microcontroller based on the ARM Cortex-M3 core, operating at a maximum frequency of 48 MHz. It features 128 KB of in-system programmable Flash memory and 16 KB of SRAM. The device includes an internal oscillator and supports supply voltages from 1.62 V to 3.6 V. Peripheral interfaces include I2C, IrDA, SPI, and UART/USART. It offers 47 general-purpose I/O lines and integrates peripherals such as DMA, PWM, WDT, and brown-out detection/reset circuits.

Feature Summary

• Built on the ARM Cortex-M3 processor with Thumb-2 instruction set for efficient code density and performance.
• Integrates high-speed embedded Flash and SRAM with memory accelerator for single-cycle execution.
• Supports capacitive touch sensing via QTouch library integration for user interface applications.
• Includes comprehensive peripheral set with multiple communication interfaces and analog-to-digital conversion.

Applications

• Migration from 8-bit or 16-bit microcontrollers to 32-bit architectures
• Industrial control systems requiring low power consumption
• Consumer electronics with capacitive touch input requirements
• General-purpose embedded applications with limited pin count

Procurement Notes

Verify component authenticity through authorized Microchip Technology distributors. Confirm RoHS compliance status and check for obsolescence notices, as this part may be discontinued. Ensure packaging specifications match design requirements. Validate assembly site information against recent production change notifications to guarantee quality standards.

Selection Notes

Select this model when 128 KB Flash and 16 KB RAM are sufficient for application logic. Choose over SAM3S series variants if lower cost and reduced peripheral complexity are priorities. Verify that 48 MHz clock speed meets processing requirements. Ensure 64-LQFP package fits PCB layout constraints. Confirm voltage range compatibility with system power supply.

Part Context

This component belongs to the SAM3N family of flash microcontrollers designed for entry-level general-purpose applications. The series provides a migration path from 8/16-bit MCUs while maintaining pin compatibility with higher-performance SAM3S devices. It targets cost-sensitive designs requiring ARM Cortex-M3 capabilities without complex networking peripherals.

Replacement Considerations

ATSAM3N2CA-AU: Same Flash/RAM size but different ADC resolution (10-bit vs unspecified). ATSAM3N1BA-AU: Reduced Flash (64 KB) and RAM (8 KB). ATSAM3N4BA-AU: Increased Flash (256 KB) and RAM (24 KB). Verify pinout compatibility and peripheral differences before substitution.