ATXMEGA64D4-AU
ATXMEGA64D4-AU - 32MHz 64KB AVR MCU | Microchip
The Microchip Technology ATXMEGA64D4-AU is a high-performance 8/16-bit AVR XMEGA D4 microcontroller with 32 MHz operation, 64 KB flash memory, 2 KB EEPROM, 4 KB SRAM, and 34 general-purpose I/O lines. It is housed in a 44-pin TQFP package measuring 10 mm by 10 mm. The device targets embedded systems requiring broad serial connectivity, timing, analog, and event-driven control without the memory footprint of a larger 32-bit MCU.
An 8/16-bit microcontroller is a compact embedded controller that executes instructions from internal program and data memory while integrating peripherals for communication, timing, interrupts, and signal control. In the broader device hierarchy, the ATXMEGA64D4-AU belongs to the AVR family, the XMEGA D4 subfamily, and ultimately the semiconductor and embedded-control categories. Its enhanced RISC architecture supports predictable instruction throughput suitable for motor, communications, instrumentation, and industrial control designs.
Verified device features include read-while-write in-system-programmable flash, a 4 KB boot-code section, a four-channel event system, a programmable multilevel interrupt controller, four flexible 16-bit timer/counter blocks, a 16-bit real-time counter, two USARTs, two two-wire serial interfaces, and additional connectivity documented in the AVR XMEGA D4 datasheet. This peripheral mix supports simultaneous sensor acquisition, actuator timing, serial links, and event-based signal routing.
The ATXMEGA64D4-AU combines 64 KB of flash with only 4 KB of SRAM, making flash utilization and interrupt timing important design considerations. Firmware should use the documented memory regions carefully, avoid unnecessary blocking routines, and reserve SRAM for stacks, buffers, and time-critical data. In-system programming and read-while-write operation can simplify firmware updates, although application code must observe the device's program-memory execution restrictions.
Typical applications include industrial control panels, sensor hubs, motor-control peripherals, data-acquisition modules, building-control nodes, low-power serial gateways, and compact embedded instruments. The 34 I/O lines allow connection of sensors, displays, communications transceivers, and actuators while retaining dedicated peripheral functions. Compared with simpler 8-bit MCUs, the XMEGA D4 architecture offers higher clock speed and a broader peripheral set; compared with higher-end 32-bit MCUs, it offers a simpler control-oriented architecture and lower memory capacity.
Designers should verify every package pin, alternate-function mapping, voltage domain, and peripheral limit against the manufacturer datasheet before layout release. The -AU ordering information identifies the 44-pin TQFP device, but package suffixes, temperature grades, clock options, and programmed variants must be checked during procurement. A hardware design should preserve the recommended decoupling, programming-interface access, clock stability, and exposed-ground layout practices specified by Microchip.
This page consolidates the verified manufacturer and distributor information for ATXMEGA64D4-AU with engineering-focused selection guidance. It distinguishes documented capabilities from unavailable details, emphasizes the 32 MHz and 64 KB memory limits, and avoids treating functionally similar MCUs as verified drop-in replacements. For sourcing, use the linked distributor records to confirm current inventory, price, delivery, and exact suffix handling.
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