ATSAM3U1EA-AU

Overview

The ATSAM3U1EA-AU is a 32-bit microcontroller based on the ARM Cortex-M3 core, manufactured by Microchip Technology under the SAM3U series. It features 64 kB of Flash program memory and 20 kB of SRAM. The device operates at a maximum clock frequency of 96 MHz and supports a supply voltage range of 1.62 V to 3.6 V. It includes one USB 2.0 Device interface, four USART channels, five SPI interfaces, two TWI interfaces, and eight timers. The component utilizes an LQFP-144 package with 96 available I/O ports and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates a high-speed USB 2.0 Full-Speed/High-Speed Device controller for peripheral connectivity.
• Provides extensive communication capabilities through multiple USART, SPI, and TWI interfaces.
• Includes a Memory Protection Unit (MPU) for enhanced system security and stability.
• Supports low-power operation with standby mode consumption as low as 2.5 μA.

Applications

• USB-enabled consumer electronics devices
• Industrial motor control and application systems
• PC peripherals and external storage interfaces

Procurement Notes

Verify component authenticity through authorized Microchip distributors or certified agents. Confirm RoHS compliance status and check for obsolescence notices, as this part may be discontinued. Ensure ESD handling protocols are followed during assembly due to the surface-mount LQFP-144 packaging. Validate that the specific suffix matches design requirements before procurement.

Selection Notes

Select this MCU when a balance of moderate Flash capacity and robust USB connectivity is required. It is suitable for designs needing multiple serial interfaces without the complexity of higher-end SAM3X variants. Consider power consumption constraints if utilizing low-power modes, and ensure the 144-pin footprint fits the target PCB layout.

Part Context

This component belongs to the Atmel SAM3U family, which bridges the gap between entry-level and high-performance ARM Cortex-M3 MCUs. The series is characterized by integrated USB controllers and flexible memory configurations. Microchip Technology acquired Atmel, continuing support for these legacy industrial and consumer control platforms.

Replacement Considerations

Consult official Microchip documentation for cross-reference data. Potential alternatives within the same family include the ATSAM3U2EA-AU or ATSAM3U4CA-AU, depending on memory and pin count requirements. Verify pin compatibility and software register mapping before substitution.