ATMEGA8U2-AUR

Overview

The ATMEGA8U2-AUR is an 8-bit AVR microcontroller featuring 8KB of In-System Programmable Flash, 512 bytes of EEPROM, and 512 bytes of SRAM. It integrates a USB 2.0 Full-speed Device Module compliant with Universal Serial Bus Specification REV 2.0, utilizing a 48 MHz PLL for data transfer rates at 12 Mbit/s. The device operates within a voltage range of 2.7V to 5.5V and supports frequencies up to 16MHz. It includes two flexible Timer/Counters, one USART, SPI, and 22 programmable I/O lines housed in a 32-TQFP package.

Feature Summary

• Integrates a USB 2.0 Full-speed Device Module with independent endpoint memory allocation and support for Bulk, Interrupt, and Isochronous transfers.
• Features an advanced RISC architecture executing most instructions in a single clock cycle for high throughput efficiency.
• Includes non-volatile memory with Read-While-Write capabilities and optional boot code sections with independent lock bits.
• Provides multiple power-saving modes including Idle, Power-save, Power-down, Standby, and Extended Standby.

Applications

• USB peripheral devices requiring full-speed communication
• Embedded control systems needing integrated USB connectivity
• Industrial applications operating within industrial temperature ranges

Procurement Notes

Verify the specific ordering suffix 'AUR' corresponds to the TQFP32 package and industrial temperature grade (-40°C to +85°C) as documented. Confirm that the internal calibrated oscillator configuration meets system timing requirements without external crystals. Ensure UVCC and UCAP pins are properly decoupled according to datasheet recommendations for stable USB operation.

Selection Notes

Select this component when a compact 8-bit MCU with native USB functionality is required. The ATMEGA8U2 offers sufficient program memory for firmware development while maintaining low power consumption. Consider the 32-TQFP package dimensions for PCB layout constraints. Verify compatibility with existing development tools such as debugWIRE interfaces for programming and debugging.

Part Context

The ATMEGA8U2 belongs to the ATmega U-series microcontrollers designed specifically for USB applications. It shares architectural similarities with the ATmega8 but adds dedicated USB hardware peripherals. This series allows designers to implement USB connections without separate controller chips, reducing bill of materials and board space compared to solutions using standard AVRs plus external transceivers.

Replacement Considerations

ATMEGA8U2-AU (Same family, different package)

FAQ

Does the ATMEGA8U2 support true Read-While-Write operation?

Yes, the on-chip ISP Flash allows software in the Boot Flash section to continue running while the Application Flash section is updated, providing true Read-While-Write capability.

What is the maximum data transfer rate supported by the USB module?

The USB module complies with USB Specification REV 2.0 and supports data transfer rates at 12 Mbit/s using a 48 MHz PLL for Full-speed bus operation.