Product Overview

ATMEGA328PB-AU is an enhanced 8-bit microcontroller in the ATMEGA328 series launched by Microchip Technology, based on the high-efficiency AVR® 8-bit RISC CPU with a maximum frequency of 20 MHz and a computing performance of 16 MIPS (at 1 MHz frequency), balancing high performance and low power consumption. It adopts an TQFP-32 package (7×7mm, Thin Quad Flat Package) , integrating 32 KB In-System Programmable Flash memory, 2 KB SRAM, and 1 KB EEPROM. Supporting ISP and IAP programming methods, it has a supply voltage range of 2.7~5.5V and an industrial-grade operating temperature range of -40~85℃. As an upgraded version of the ATMEGA328P, it adds 1 UART, 1 SPI, and 1 I2C interface compared to the previous generation, significantly improving peripheral expandability. Fully compatible with the ATMEGA328P in pin definition and software ecosystem, it enables seamless replacement and upgrading, widely used in Arduino development, industrial control, consumer electronics, and portable medical devices. It is an embedded core choice that balances cost, performance, and compatibility.

Key Features

• Enhanced Peripheral Configuration with Stronger Expandability：Compared to the basic ATMEGA328P, it adds 1 UART (total 3), 1 SPI (total 2), and 1 I2C (total 2) interface, supporting simultaneous multi-device communication; integrates 2×10-bit ADCs (16 channels), 2 timers/counters (8-bit TC0, 16-bit TC1/TC2), and 1 PWM controller (6 PWM outputs), eliminating the need for additional expansion chips to meet multi-scenario functional requirements.
• Wide Voltage & Temperature Design for Strong Environmental Adaptability：Supply voltage of 2.7~5.5V, compatible with lithium batteries (3.7V) and industrial power supplies (5V); industrial-grade operating temperature of -40~85℃, withstanding harsh high/low-temperature environments, ensuring stable operation in outdoor devices and industrial control cabinets, avoiding functional abnormalities caused by temperature fluctuations.
• Multi Low-Power Modes for Excellent Battery Life：Supports 4 low-power modes: Idle, ADC Noise Reduction, Power-Save, and Power-Down. The typical current in Power-Down mode is only 0.1μA (VCC=3.3V, TA=25℃), and the Idle mode current is as low as 0.3mA (1 MHz frequency), suitable for battery-powered portable devices (e.g., wireless sensors, smart bracelets).
• Full Compatibility with ATMEGA328P for Seamless Upgrading：Consistent pin definition and register mapping with the ATMEGA328P, enabling direct software code reuse without PCB redesign; supports firmware burning for mainstream development boards such as Arduino Uno/Nano, allowing developers to quickly upgrade based on existing ATMEGA328P projects and reduce migration costs.
• High-Reliability Storage for Long-Term Stable Operation：32 KB Flash memory with ≥10,000 erase/write cycles and ≥20 years of data retention (TA=85℃); 1 KB EEPROM with ≥100,000 erase/write cycles, supporting power-off data storage, suitable for industrial control scenarios requiring long-term storage of configuration parameters and log data.

Technical Specifications

Typical Applications

• Open-Source Hardware & Education (Arduino-Compatible Boards)：The ATMEGA328PB-AU can directly replace the ATMEGA328P in Arduino Uno/Nano development boards. The added UART/SPI/I2C interfaces support simultaneous connection of Wi-Fi modules (e.g., ESP8266), Bluetooth modules (HC-05), and sensors (e.g., SHT30 temperature-humidity sensor) without additional IO expansion, suitable for open-source project development and embedded education, reducing the development difficulty of multi-device communication.
• Consumer Electronics (Smart Home Sensors)：In smart temperature-humidity sensors and PIR motion switches, its Power-Down mode (0.1μA) extends battery life to over 1 year; 2 I2C interfaces can connect sensors and OLED displays simultaneously; 32 KB Flash can store sensor data processing algorithms and user interaction logic; the TQFP-32 package adapts to the miniaturized sensor housing design.
• Industrial Control (Small PLC/Motor Drives)：In small relay controllers and stepper motor drive modules, the 16-bit timer supports precise pulse output (PWM frequency adjustable from 0.98 Hz to 20 MHz); 2 SPI interfaces can connect industrial encoders and communication modules; the wide-temperature feature (-40~85℃) adapts to factory high/low-temperature environments; the 10,000-time Flash erase/write life meets the long-term upgrade needs of industrial equipment.
• Portable Medical (Blood Pressure Monitors/Pulse Oximeters)：The 10-bit ADC (16 channels) can accurately collect physiological signals (e.g., pressure signals from blood pressure sensors, light intensity signals from pulse oximeters); 1 KB EEPROM can store user historical measurement data; the low-power Idle mode (0.3mA@1 MHz) extends the battery life of portable devices; RoHS 2.0 compliance meets the environmental requirements of medical devices.
• Automotive Electronics (In-Vehicle Small Control Modules)：In in-vehicle USB chargers and window lift auxiliary controllers, the wide voltage (2.7~5.5V) adapts to in-vehicle power fluctuations; 3 UARTs can connect in-vehicle CAN-to-UART modules and status indicator lights; the -40℃ low-temperature startup feature ensures stable operation in winter; IEC 60730 safety certification meets the reliability standards of automotive electronics.

Why Choose ATMEGA328PB-AU ?

• Full Compatibility for Zero-Cost Upgrading：Fully compatible with the ATMEGA328P in hardware pins and software ecosystem, existing projects based on the ATMEGA328P (e.g., Arduino projects, industrial control boards) can be directly replaced. Developers only need to replace the chip to obtain stronger peripheral expandability.
• Doubled Peripherals for Comprehensive Functions：1 more UART, 1 more SPI, and 1 more I2C than the ATMEGA328P, supporting simultaneous connection of more external devices (e.g., multi-sensors, multi-communication modules), reducing the use of IO expansion chips, lowering BOM costs (by approximately 15%) and PCB area (by approximately 20%).
• Industrial-Grade Reliability for Unlimited Scenarios：-40~85℃ wide temperature range + 2.7~5.5V wide voltage design, covering harsh environments such as industrial, automotive, and outdoor; high erase/write life and data retention time of Flash/EEPROM ensure long-term (5~10 years) stable operation of devices, without worrying about storage failures.
• Low Power & High Cost-Effectiveness for Controllable Costs：The balance between 0.1μA Power-Down mode current and 16 MIPS high performance adapts to multi-scenario needs from portable devices to industrial controllers; as a mass-produced Microchip model, it has a stable supply chain, and the bulk purchase unit price is close to that of the ATMEGA328P, with significant cost-effectiveness.
• Mature Ecosystem for Efficient Development：Supports mainstream development tools such as Arduino IDE and Microchip Studio, with a large number of open-source examples (e.g., sensor drivers, communication protocols, PWM control); Microchip’s official website provides detailed datasheets, application notes, and simulation tools, allowing beginners to get started quickly and shortening project development cycles by 30%.

SUNTOP COMPANY INTRODUCTION

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