The ATmega328-PU is a popular 8-bit microcontroller from Microchip (formerly Atmel) that features 32KB of flash memory. Below is an overview of the ATmega328-PU microcontroller, highlighting its key features, specifications, package type, and typical applications:


ATmega328-PU Overview:

  • Manufacturer: Microchip (formerly Atmel)
  • IC Type: Microcontroller Unit (MCU)
  • Architecture: 8-bit AVR
  • Flash Memory: 32KB for program storage
  • Package: 28-pin Dual In-Line Package (DIP)
  • Operating Voltage: Typically runs at 5V
  • Clock Speed: Capable of running up to 20 MHz

Key Features:

  • Flash Memory: Offers 32KB of in-system programmable flash memory for storing program instructions.
  • RAM: Typically includes around 2KB of SRAM for data storage and manipulation.
  • EEPROM: Provides approximately 1KB of EEPROM for non-volatile data storage.
  • I/O Pins: Comes with a number of I/O pins for interfacing with external components and peripherals.
  • Timers/Counters: Equipped with multiple timers/counters for various timing applications.
  • Communication Interfaces: Supports SPI, I2C, UART, and more communication protocols.
  • Analog-to-Digital Converter (ADC): Features a 10-bit ADC for analog sensor interfacing.
  • DataSheet ATMEGA328-PU PDF


  • Operating Voltage Range: Typically operates at 1.8V to 5.5V.
  • Clock Speed: Supports clock speeds up to 20 MHz for fast processing.
  • Package Type: 28-pin Dual In-Line Package (DIP) for easy through-hole mounting.
  • GPIO: Multiple General Purpose Input/Output pins for versatile connectivity.
  • Low Power Consumption: Capable of operating in low power modes for energy-efficient applications.
  • Peripherals: Includes hardware USART, SPI, and I2C interfaces for communication.

Typical Applications:

  • Embedded Systems: Used in a wide range of embedded applications due to its versatility and performance.
  • DIY Electronics: Popular in hobbyist projects for building custom electronics and microcontroller-based systems.
  • Automation: Utilized in automation systems for control and monitoring tasks.
  • IoT Devices: Suitable for Internet of Things (IoT) projects requiring microcontroller functionality.


  • The ATmega328-PU is widely used in various projects ranging from simple LED blinking exercises to more complex applications like robotics and data logging systems.
  • To effectively utilize the microcontroller, refer to the official datasheet, development tools like compilers, and programming environments provided by Microchip (Atmel) for seamless integration into your projects.

The ATmega328-PU microcontroller offers a robust set of features, considerable program memory, and ample connectivity options, making it suitable for a wide range of embedded projects and applications that require reliable and versatile microcontroller functionality.

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