ATSAM3U2CA-AU

Overview

The ATSAM3U2CA-AU is a 32-bit ARM Cortex-M3 microcontroller operating at 96 MHz. It features 128 kB of single-plane Flash memory and 36 kB of SRAM. The device includes a High-Speed USB Device port, HSMCI for SD/MMC, an External Bus Interface with NAND controller, four USARTs, one UART, two TWI interfaces, four SPI channels, and four PWM timers. It supports 4-channel 12-bit and 10-bit ADCs. Power supply ranges from 1.62V to 3.6V. It is housed in a 100-lead LQFP package measuring 14 x 14 mm.

Feature Summary

• High-speed data transfer architecture with multi-layer bus matrix and DMA channels
• Integrated USB 2.0 High-Speed Device port with dedicated transceiver
• Support for external memory via Static Memory Controller and NAND Flash controller
• Real-time Event Management for peripheral-to-peripheral communication

Applications

• Data loggers
• PC peripherals
• USB to SDIO bridge applications
• USB to SPI bridge applications

Procurement Notes

Verify the specific ordering suffix 'AU' corresponds to the industrial temperature range and lead-free RoHS compliance as defined in the official datasheet. Confirm the package type matches the required 100-lead LQFP footprint dimensions. Ensure voltage supply requirements align with the 1.62V to 3.6V operational range specified for the core and I/O lines.

Selection Notes

Select this component when a 96 MHz Cortex-M3 processor with integrated high-speed USB connectivity is required. It is suitable for designs needing direct interfacing with SD cards or MMCs via the HSMCI interface. Consider the 128 kB Flash and 36 kB RAM limits against application code size and runtime data needs before finalizing the choice.

Part Context

This part belongs to the Atmel SMART SAM3U series of Flash microcontrollers based on the ARM Cortex-M3 core. The series is designed for high-performance applications requiring fast data throughput and low power consumption. The 'C' designation indicates the 100-pin package variant within the family.

Replacement Considerations

ATSAM3U2E-AU (144-pin package)

FAQ

What are the available low-power modes?

The device supports Sleep, Wait, and Backup modes. Sleep stops the processor while keeping other functions running. Wait stops all clocks but maintains power for fast startup. Backup runs only the RTC and wake-up logic for minimal consumption.

Does the ATSAM3U2CA-AU support external memory expansion?

Yes, it includes a Static Memory Controller (SMC) supporting SRAM and NOR flash, as well as a NAND Flash Controller with ECC and a 4 Kbyte RAM buffer.