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Description
ATMEGA328P-PU Product Overview
The ATMEGA328P-PU is a high-performance, low-power 8-bit AVR microcontroller from Microchip Technology , housed in a 28-pin PDIP (DIP-28) through-hole package. Based on the AVR enhanced RISC architecture, ATMEGA328P-PU achieves CPU throughput approaching 1 MIPS per MHz by executing instructions in a single clock cycle. ATMEGA328P-PU integrates 32KB of In-System Self-Programmable Flash (with Read-While-Write support), 1KB EEPROM, and 2KB SRAM. ATMEGA328P-PU supports a wide operating voltage range of 1.8V to 5.5V, a maximum frequency of 20MHz, and an industrial temperature range of -40℃ to +85℃. As the core processor of the Arduino UNO R3, the ATMEGA328P-PU enjoys widespread recognition and a mature development ecosystem within the developer community.
ATMEGA328P-PU Key Features
ATMEGA328P-PU features high‑performance low‑power 8‑bit AVR RISC core
ATMEGA328P-PU provides 32KB in‑system self‑programmable Flash
ATMEGA328P-PU includes 2KB SRAM, 1KB EEPROM data storage
ATMEGA328P-PU uses DIP‑28 dual in‑line package, socket plug‑and‑play support
ATMEGA328P-PU operating voltage: 2.7V‑5.5V
ATMEGA328P-PU max operating frequency up to 20MHz
ATMEGA328P-PU built‑in UART, SPI, I2C communication interfaces
ATMEGA328P-PU multi‑channel 10‑bit ADC, timer & PWM output
ATMEGA328P-PU supports ISP in‑system programming
ATMEGA328P-PU Applications
With its excellent cost-performance ratio, rich peripheral resources, and mature development ecosystem, the ATMEGA328P-PU is widely used in:
Arduino & Open-Source Hardware: ATMEGA328P-PU is the core MCU of Arduino UNO R3, Arduino Nano, and other classic development boards
Embedded Systems & IoT: ATMEGA328P-PU is used in smart sensors, data acquisition terminals, environmental monitoring
Industrial Control & Automation: ATMEGA328P-PU is applied in PLC expansion modules, industrial instruments, motor control
Consumer Electronics & Home Appliances: ATMEGA328P-PU is found in smart home devices, remote controls, appliance control boards
Robotics & Drones: ATMEGA328P-PU is used in small robots, racing cars, drone flight controllers
Education & Prototyping: ATMEGA328P-PU supports university electronics courses, graduation projects, research prototypes
ATMEGA328P-PU Advantages and Highlights
One of the World's Most Popular 8-Bit MCUs: As the core processor of Arduino UNO, the ATMEGA328P-PU boasts the largest developer community and richest open-source project resources, with extensive references and ready-to-use code for all skill levels.
DIP-28 Through-Hole Package for Prototyping: The 28-pin PDIP package of ATMEGA328P-PU with 2.54mm (0.1-inch) pin spacingis ideal for breadboard prototyping and manual soldering. Compared to SMD packages, DIP eliminates the need for custom PCBs during early development.
picoPower Ultra-Low Power Technology: With picoPower® technology, ATMEGA328P-PU standby current is as low as 0.1μA, and 1.8V low-voltage operationmakes it ideal for battery-powered portable devices and IoT nodes.
1.8V-5.5V Wide Voltage Operation: ATMEGA328P-PU supports a wide voltage range from 1.8V to 5.5V, compatible with both 3.3V and 5V systems without level shifting.
High-Endurance Non-Volatile Memory: ATMEGA328P-PU Flash supports 10,000 cycles, EEPROM supports 100,000 cycles, with 20-year data retention at 85℃.
Rich Peripherals & 6-Channel 10-bit ADC: ATMEGA328P-PU integrates UART, SPI, and I²C interfaces, a 6-channel 10-bit ADC, and 6 PWM channels.
Mature Development Toolchain: ATMEGA328P-PU supports Arduino IDE, Atmel Studio, AVR-GCC, with official Microchip libraries and extensive open-source community resources.
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FAQs:
Question What is the ATMEGA328P-PU chip?
Answer ATMEGA328P-PU is a high-performance 8-bit AVR microcontroller from Microchip, using an advanced RISC architecture where most instructions execute in a single clock cycle.
Question What is its core frequency and memory capacity?
Answer ATMEGA328P-PU runs at a maximum frequency of 20MHz, achieving 20MIPS. It features 32KB of Flash, 2KB of SRAM, and 1KB of EEPROM.
Question What package does this chip use?
Answer ATMEGA328P-PU adopts a 28-pin PDIP (DIP-28) package, which is a through-hole format ideal for breadboard prototyping, DIY projects, and hand soldering.
Question What are the voltage and temperature ranges?
Answer The operating voltage of ATMEGA328P-PU ranges from 1.8V to 5.5V, with 5V usually providing optimal performance. It is rated for an industrial temperature range of -40°C to +85°C.
Question What communication interfaces does it support?
Answer ATMEGA328P-PU supports a USART/UART serial interface, SPI, and I2C (TWI) interfaces, allowing easy connection to various peripherals.
Question What is its role in the Arduino ecosystem?
Answer ATMEGA328P-PU is the core MCU for the Arduino Uno, featuring a pre-loaded bootloader for programming via Arduino IDE in C/C++, and has massive community support.
Question How can it be programmed?
Answer You can burn code to ATMEGA328P-PU via the pre-loaded bootloader over serial, or use an ISP programmer connecting the MISO, MOSI, SCK, and RESET pins.
Question How is its low-power performance?
Answer In power-down mode, ATMEGA328P-PU consumes only 0.1 microamps at 1.8V, which combined with sleep modes can significantly extend battery life.
Question What is its advantage over newer MCUs?
Answer Compared to comparable 32-bit MCUs, ATMEGA328P-PU's 8-bit DIP architecture offers a very low unit cost and low entry barrier, providing excellent value in simple control applications.
Question What are the design considerations for peripheral circuits?
Answer When designing with ATMEGA328P-PU, place a 0.1μF decoupling capacitor near the VCC pin, use an external crystal for clocking, and add a 10kΩ pull-up resistor with a 0.1μF capacitor to the RESET pin.