ATmega164PA-AU

Updated: 2026-09-16

Overview

The ATmega164PA-AU is an 8-bit microcontroller from Microchip's AVR family, designed for embedded applications requiring low power and high performance. It features 16KB of Flash memory, 1KB SRAM, and 512B EEPROM, making it suitable for real-time control tasks. Built on the AVR RISC architecture, it operates at up to 20MHz and integrates peripherals like timers, ADCs, and communication interfaces (UART, SPI, I2C). The 'PA' suffix denotes enhanced power efficiency, ideal for battery-powered systems.

Structure and Working Principle

The ATmega164PA-AU consists of a central processing unit (CPU), memory modules, and integrated peripherals. The CPU executes instructions fetched from Flash memory, while SRAM stores temporary data and EEPROM retains non-volatile settings. It operates on a single 1.8-5.5V supply, with multiple sleep modes to minimize power consumption. Peripheral interfaces enable communication with sensors, displays, and other ICs, facilitating complex system designs.

Key Features

The microcontroller's standout features include its low-power operation (as low as 0.1µA in power-down mode) and robust peripheral set. It supports 32 general-purpose I/O pins, a 10-bit ADC, and hardware-based PWM for motor control. The 'PA' variant improves on earlier models with reduced active and idle power consumption, critical for energy-sensitive applications like IoT devices or portable instruments.

Application Areas

Common applications include industrial automation (PLC systems, motor control), consumer electronics (smart home devices), and automotive subsystems (sensor interfaces). Its reliability and peripheral integration make it a preferred choice for mid-complexity embedded designs. In B2B contexts, it is often used in OEM products requiring custom firmware, such as HVAC controllers, lighting systems, or handheld test equipment.

Maintenance and Precautions

To ensure longevity, avoid exceeding the rated voltage (5.5V max) or operating temperature (-40°C to +85°C). Proper decoupling capacitors should be placed near the power pins to stabilize supply voltage. ESD precautions are critical during PCB assembly; use grounded workstations. Firmware should include watchdog timers to recover from unexpected stalls.

B2B Procurement Guide

When sourcing the ATmega164PA-AU, verify authenticity by purchasing from authorized distributors like Microchip Direct or trusted resellers. Bulk orders (100+ units) typically qualify for discounted pricing. Lead times vary; plan for 6-8 weeks during chip shortages. Evaluate alternative AVR models (e.g., ATmega324PA) for pin-compatible backups if supply chain disruptions occur.