The ATmega644PA-AU, manufactured by Microchip Technology (formerly Atmel), is an 8-bit microcontroller unit (MCU) designed for embedded systems. Below are the key details about this specific microcontroller:


  • Manufacturer: Microchip Technology (formerly Atmel)
  • Part Number: ATmega644PA-AU
  • Package/Case: 44-TQFP (Thin Quad Flat Package)
  • Flash Memory: 64KB
  • RAM: 4KB
  • Operating Voltage: 1.8V to 5.5V
  • CPU Speed: The MCU typically operates at 1.8V at 4MHz, and 5V at 20MHz
  • Features: 32 I/O lines, 8-channel 10-bit ADC, USART, SPI, Two-wire Interface (I2C), 3 Timers, 6 PWM channels
  • DataSheet ATMEGA644PA-AU PDF


The ATmega644PA-AU is ideal for applications requiring a balance between high-performance and low power consumption. With its extensive set of peripherals and a 64KB Flash program memory, it is commonly used in a variety of embedded applications that require complex functionality in compact and cost-effective designs.


This microcontroller is commonly used in various embedded systems applications such as:

  • Industrial automation
  • Consumer electronics
  • Home automation
  • Internet of Things (IoT) devices
  • Robotics
  • Automotive applications
  • Control systems
  • Sensor interfacing

Development and Prototyping:

For development and prototyping, the MCU is fully supported by the Atmel Studio and a wide range of hardware tools, including in-circuit emulators, development kits, and evaluation boards. There is also a large community with example code and libraries available, which can significantly aid in the development process.

The ATmega644PA-AU is a popular choice due to its rich feature set and availability, making it suitable for a wide range of embedded applications that require a good balance between performance, flexibility, and cost-effectiveness. However, ensure to refer to the latest datasheet and specifications to ensure suitability for your specific project.

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