ATMEGA328P-PU: 8-bit AVR Microcontroller, 32KB Flash, 1KB EEPROM, 2KB SRAM

The ATmega328P-PU by Microchip is an 8-bit microcontroller based on the AVR RISC architecture, designed for high performance and low power consumption. It features 32KB of in-system self-programmable flash memory, 1KB EEPROM, and 2KB internal SRAM, supporting a wide range of applications. The microcontroller operates at up to 16MHz, providing up to 16MIPS throughput, which allows for efficient power consumption versus processing speed optimization.

This microcontroller includes a variety of peripheral features such as two 8-bit and one 16-bit timer/counters, six PWM channels, an 8-channel 10-bit ADC, a programmable serial USART, master/slave SPI serial interface, and a byte-oriented 2-wire serial interface (I2C compatible). It also features a programmable watchdog timer, an on-chip analog comparator, and interrupt and wake-up on pin change capabilities, making it highly suitable for a wide range of electronic applications.

Key Specifications and Features

  • CPU: 8-bit AVR RISC architecture
  • Flash Memory: 32KB in-system self-programmable
  • SRAM: 2KB
  • Maximum Clock Speed: 16MHz
  • Peripheral Features: PWM, ADC, USART, SPI, I2C
  • Operating Voltage: 2.7V to 5.5V
  • Temperature Range: -40°C to +125°C (Automotive grade)
  • Package: 32-lead TQFP, 32-pad QFN/MLF

ATMEGA328P-PU Datasheet

ATMEGA328P-PU datasheet (PDF)


  • Embedded systems
  • Consumer electronics
  • Automotive applications
  • IoT devices



General information

Microcontrollers (MCUs) are compact integrated circuits designed to govern a specific operation in an embedded system. They are self-contained systems featuring a processor, memory, and peripherals that can serve as the brain of electronic devices. MCUs are pivotal in the development of applications ranging from simple to complex systems due to their versatility and efficiency.

The selection of an MCU for a project involves considering factors such as processing power, memory size, I/O capabilities, power consumption, and cost. Engineers often look for MCUs that offer the best balance between performance and power efficiency, as well as the availability of necessary peripherals for the application. The integration of various peripherals like ADCs, UARTs, timers, and PWM channels within an MCU simplifies the design process and reduces the need for additional components.

The ATmega328P-PU is an example of an AVR microcontroller that combines high performance with low power consumption, making it suitable for a wide range of applications. Its comprehensive set of features allows engineers to design efficient and compact embedded systems. When choosing an MCU like the ATmega328P, engineers must consider the device's memory capacity, clock speed, available peripherals, and the specific requirements of their application.

The AVR architecture, on which the ATmega328P-PU is based, is known for its simple instruction set and efficient operation, contributing to the microcontroller's popularity in the electronics community. The ATmega328P-PU's wide operating voltage range and temperature tolerance make it adaptable to various environments, further enhancing its applicability in diverse electronic projects.

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