ATXMEGA64D4-AU

Overview

The ATXMEGA64D4-AU is an 8/16-bit microcontroller based on the AVR XMEGA D4 architecture, housed in a 44-lead TQFP package. It features 64KB of self-programmable flash memory, 2KB of EEPROM, and 4KB of internal SRAM. The device operates at frequencies up to 32MHz when powered by 2.7V or higher, and up to 12MHz from 1.6V. It includes a twelve-channel 12-bit ADC, two USARTs, two TWI interfaces, two SPI interfaces, four 16-bit timer/counters, and a four-channel event system.

Feature Summary

• Supports capacitive touch sensing via QTouch library integration for buttons, sliders, and wheels
• Features a four-channel event system that offloads data transfer and inter-peripheral signaling from the CPU
• Includes high-resolution extensions on all timer/counters and advanced waveform extension on one timer/counter
• Provides five software-selectable power saving modes with fast wake-up capabilities

Applications

• Industrial control and factory automation
• Building and climate control systems
• Utility metering with RF connectivity
• HVAC and white goods applications

Procurement Notes

Verify the specific ordering code matches the required package type and temperature range. Confirm the suffix indicates standard tape and reel availability if automated assembly is intended. Ensure the component complies with RoHS directives and halide-free requirements as specified in the manufacturer documentation.

Selection Notes

Select this model for applications requiring low-power operation with large memory capacity. The device supports read-while-write capabilities for boot loader functionality. Consider the available I/O pins and peripheral count against system interface requirements before finalizing the design.

Part Context

This component belongs to the Microchip AVR XMEGA D4 family, which utilizes picoPower technology to scale low-power characteristics across different memory sizes. The family shares a common instruction set and peripheral structure, allowing for flexible migration between devices with varying memory capacities within the same series.

Replacement Considerations

Compatible substitutes include ATXMEGA32D4-AU and ATXMEGA128D4-AU. These variants share the same pinout and core architecture but differ in program memory size and SRAM capacity. Verify that the application logic fits within the memory constraints of the alternative part number.