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ATmega328P-AU

8-bit AVR MCU, 32KB Flash, 2KB SRAM, 20MHz, TQFP-32, Arduino Uno core

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Manufacturer Part：

ATmega328P-AU

Package：

TQFP-32 (7.00 x 7.00 x 1.20 mm)

Description

Product Overview

The ATmega328P-AU from Microchip (formerly Atmel) is a high-performance 8-bit AVR RISC microcontroller with 32KB Flash, 2KB SRAM, and 1KB EEPROM in a TQFP-32 package. Running at up to 20MHz with single-cycle instruction execution, it is the heart of the Arduino Uno and Nano boards.

Key Specifications

Architecture	8-bit AVR RISC
Flash Memory	32KB
SRAM	2KB
EEPROM	1KB
Max Clock	20MHz
I/O Pins	23
ADC	10-bit, 8 channels
Supply Voltage	1.8V to 5.5V
Active Current	0.9mA @ 4MHz, 3V
Power-Down Current	0.1uA
Package	TQFP-32 (7mm x 7mm)

Features

131 instructions, most single-cycle
32 x 8 general purpose registers
10-bit ADC with 8 channels
6 PWM channels
USART, SPI, TWI (I2C)
5 sleep modes
Programmable Watchdog Timer
On-chip analog comparator

Applications

Arduino Uno / Nano
Embedded control systems
Sensor data acquisition
Motor control
Home automation

Product Introduction:ATmega328P-AU Product Introduction

The ATmega328P-AU from Microchip is a high-performance, low-power 8-bit AVR RISC microcontroller in a TQFP-32 package. It combines 32KB Flash, 2KB SRAM, and 1KB EEPROM with a rich peripheral set including 10-bit ADC, USART, SPI, TWI, and flexible timer/counters with PWM. The picoPower technology enables ultra-low power consumption with 0.1uA in power-down mode and 0.9mA active at 4MHz/3V. Running at up to 20MHz with most instructions executing in a single clock cycle, it delivers up to 20 MIPS. The ATmega328P is the core of the Arduino Uno and Nano platforms.

Working Principle:ATmega328P-AU Working Principle

The ATmega328P-AU uses the AVR enhanced RISC architecture with a Harvard memory model (separate program and data buses). The CPU fetches instructions from Flash via the 16-bit program bus and executes most in one clock cycle thanks to pipelining. The 32 general-purpose registers connect directly to the ALU. The 10-bit ADC uses successive approximation at up to 76.9ksps. Timer0 and Timer2 are 8-bit with PWM; Timer1 is 16-bit with input capture and PWM. picoPower technology uses clock gating to disable unused peripherals, and sleep modes selectively shut down CPU, Flash, ADC, and oscillators for minimum power.

Pin Description:ATmega328P-AU Pin Definition and Functions

Pin	Name	Alt Func	Description
1	PD3	INT1/OC2B	Port D3, ext int 1, Timer2 PWM B
2	PD4	XCK	Port D4, USART ext clock
3	GND	–	Ground
4	VCC	–	Digital supply
7	PB6	XTAL1	Crystal osc input
8	PB7	XTAL2	Crystal osc output
13	PB1	OC1A	Port B1, Timer1 PWM A
14	PB2	OC1B/SS	Port B2, Timer1 PWM B, SPI SS
15	PB3	MOSI/OC2A	SPI MOSI, Timer2 PWM A
16	PB4	MISO	SPI MISO
17	PB5	SCK	SPI clock
18	AVCC	–	ADC supply
20	AREF	–	ADC reference
23	PC0	SDA/ADC0	TWI data, ADC ch0
24	PC1	SCL/ADC1	TWI clock, ADC ch1
29	RESET	PC6	Reset; active LOW
30	PD0	RXD	USART receive
31	PD1	TXD	USART transmit
32	PD2	INT0	External interrupt 0

Application Scenarios:In which products and applications isATmega328P-AU used

Arduino Uno/Nano: Core MCU running Arduino bootloader with 32KB Flash and rich GPIO/ADC/UART/SPI/I2C peripherals
Sensor Data Logger: Reads sensors via ADC and I2C/SPI, stores in EEPROM, transmits via UART with picoPower sleep extending battery life
Motor Speed Controller: Generates 16-bit PWM from Timer1 for precise motor control with ADC feedback

Alternative Models:What chips are recommended as replacements for ATmega328P-AU

Model	Manufacturer	Flash	Arch	Key Difference
ATmega328P-PU	Microchip	32KB	AVR	DIP-28, same die
ATmega328PB-AU	Microchip	32KB	AVR	2nd USART/SPI
ATmega2560	Microchip	256KB	AVR	More Flash/RAM, 100-pin
STM32F103C8T6	ST	64KB	Cortex-M3	32-bit, 72MHz