ATSAM3N2CA-AU

Overview

The ATSAM3N2CA-AU is a 32-bit microcontroller from the SAM3N series, built on an ARM Cortex-M3 core operating at 48 MHz. It features 128 Kbytes of Flash memory and 16 Kbytes of SRAM. The device supports a supply voltage range of 1.62V to 3.6V and operates within a temperature range of -40°C to +85°C. Key peripherals include two USARTs, two UARTs, two TWI interfaces, three SPI interfaces, one PWM timer, six general-purpose 16-bit timers, a real-time clock, an RTC, a 10-bit ADC with ten channels, and a 10-bit DAC. It is housed in a 64-LQFP package.

Feature Summary

• Integrates an ARM Cortex-M3 processor with Thumb-2 instruction set for efficient code execution.
• Includes embedded voltage regulator supporting normal and backup power modes.
• Supports capacitive touch applications via QTouch library integration.
• Features internal ROM containing boot assistant and in-application programming routines.

Applications

• Migration from 8-bit or 16-bit microcontrollers to 32-bit architectures
• General-purpose embedded control systems
• Low-power consumer electronics requiring capacitive touch interfaces

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm RoHS compliance status and check for obsolescence notices, as some SAM3N variants may be discontinued. Ensure packaging specifications match design requirements. Validate pin compatibility with existing PCB layouts if replacing older components. Review datasheet revisions for any functional updates.

Selection Notes

Select this model when 128 Kbytes of program storage and 16 Kbytes of RAM are sufficient for application logic. Choose the 64-LQFP package for surface-mount assembly needs. Consider the 48 MHz speed limit and peripheral count relative to more advanced SAM3S or SAM3X series devices. Verify that the 1.62V to 3.6V operating voltage aligns with system power rails.

Part Context

This component belongs to the Atmel SAM3N family, designed as entry-level general-purpose microcontrollers. The series targets cost-sensitive applications requiring migration paths from lower-end architectures. It shares architectural similarities with the SAM3S series but offers reduced peripheral sets and memory sizes. The family emphasizes low power consumption and ease of use for basic control tasks.

Replacement Considerations

Check for direct pin-compatible substitutes within the SAM3N series, such as ATSAM3N2BA-AU, noting potential differences in package or revision. Verify if upgraded models like ATSAM3N4 provide necessary headroom. Consult Microchip Technology for current availability and lifecycle status of equivalent parts.