ATMEGA8U2-MUR

Overview

The ATMEGA8U2-MUR is an 8-bit AVR microcontroller featuring 8KB of in-system programmable Flash memory, 512 bytes of EEPROM, and 512 bytes of SRAM. It operates within a voltage range of 2.7V to 5.5V and supports clock frequencies up to 16MHz. The device integrates a USB 2.0 full-speed device module compliant with the Universal Serial Bus Specification Rev 2.0, utilizing a 48MHz PLL for data transfer rates at 12 Mbit/s. It includes 22 programmable I/O lines, two timer/counters, a USART, and an SPI interface. The component is housed in a 32-VQFN (5x5mm) package and functions reliably across an industrial temperature range of -40°C to +85°C.

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 in-system programming
• Industrial applications operating within specified temperature ranges

Procurement Notes

Verify the specific ordering suffix 'MUR' corresponds to the 32-VQFN package and tape-and-reel packaging configuration. Confirm that the internal oscillator calibration matches system timing requirements. Ensure the design accounts for the UVCC and UCAP pin connections for the USB regulator as specified in the datasheet. Check for any RoHS compliance documentation relevant to the manufacturing batch.

Selection Notes

Select this component when a compact QFN package is required alongside integrated USB connectivity. Consider the 8KB Flash limit for application complexity. Evaluate the need for the internal calibrated oscillator versus external crystal accuracy. Compare against ATmega16U2 or ATmega32U2 if larger memory capacity is necessary for the project scope.

Part Context

This microcontroller belongs to the ATmega family manufactured by Microchip Technology. It utilizes the AVR enhanced RISC architecture. The device is part of a series that includes variants with different memory sizes, such as the ATmega16U2 and ATmega32U2. The 'MUR' suffix indicates the specific package type and reel packaging format.

Replacement Considerations

ATMEGA8U2-AU

FAQ

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

The USB module supports data transfer rates at 12 Mbit/s, complying with USB 2.0 Full-speed specifications.

How many programmable endpoints are available for USB transfers?

The device provides four programmable endpoints supporting IN or OUT directions for Bulk, Interrupt, and Isochronous transfers.