ATSAM3U1CB-AU

Overview

The ATSAM3U1CB-AU is a 32-bit ARM Cortex-M3 microcontroller from the SAM3U series, operating at up to 96 MHz. It features 64 Kbytes of Flash memory and 20 Kbytes of SRAM. The device includes a High-Speed USB Device Port with embedded transceiver, supporting 480 Mbps transfers. Peripheral interfaces consist of three USARTs, one TWI, four SPIs, and an HSMCI for SDIO/SD/MMC. It integrates a 12-bit ADC with four channels and a 10-bit ADC with four channels. The unit operates within a voltage range of 1.62 V to 3.6 V and utilizes a 100-lead LQFP package.

Feature Summary

• High-performance 32-bit ARM Cortex-M3 processor running at maximum speeds of 96 MHz
• Integrated High-Speed USB Device Port with dedicated DMA and embedded transceiver
• Multi-layer bus matrix architecture enabling parallel task execution and high data throughput
• Support for multiple low-power modes including Sleep, Wait, and Backup

Applications

• Data loggers requiring reliable storage and retrieval capabilities
• PC peripherals utilizing USB connectivity for host communication
• High-speed bridge applications converting between USB and SDIO or SPI protocols

Procurement Notes

Verify the specific ordering suffix against official Microchip documentation to confirm package type and temperature grade. Ensure compatibility with required voltage levels and interface configurations before integration. Cross-reference the datasheet revision to validate peripheral availability and electrical characteristics for the specific manufacturing batch.

Selection Notes

Select this component when a balance of processing power and integrated USB functionality is required in a compact form factor. The 100-pin LQFP package offers sufficient I/O lines for moderate complexity designs. Consider the available memory sizes relative to application firmware requirements and ensure the system design accommodates the specified voltage ranges for both core and I/O operations.

Part Context

This device belongs to the SAM3U series of flash microcontrollers based on the ARM Cortex-M3 core. The series provides scalable memory options and varying pin counts to suit different application needs. The ATSAM3U1 variant specifically targets cost-sensitive applications while maintaining high-speed data transfer capabilities through its integrated peripherals and bus matrix architecture.

Replacement Considerations

Consult the official datasheet configuration summary for direct pin-compatible alternatives within the SAM3U family, such as the ATSAM3U2C or ATSAM3U4C, which offer increased memory resources while maintaining the same package footprint.