ATmega328P-AU
Microcontrollers
Technical Specifications
| Type | Description |
|---|---|
| Core Processor | AVR |
| Core Bits | 8 |
| Maximum Clock Speed | 20 MHz |
| Flash Memory | 32 KB |
| Number of I/O | 23 |
| Flash Type | FLASH |
| Type | Description |
|---|---|
| Adc Bits | 10.0 |
| Oscillator Type | Built-in |
| Eeprom Bytes | 1 KB |
| Operating Temp | -40°C ~ +85°C |
| Working Voltage V | 3.65 V |
| Package / Case | TQFP-32 |
Product Introduction
The ATmega48A/PA/88A/PA/168A/PA/328/P is a low-power CMOS 8-bit microcontroller based on the AVR enhanced RISC architecture.
Features
- High Performance, Low Power Atmel 8-Bit Microcontroller Family
- Advanced RISC Architecture – 131 Powerful Instructions – Most Single Clock Cycle Executi – 32 x 8 General Purpose Working Registers – Fully Static Operation – Up to 20 MIPS Throughput at 20MHz – On-chip 2-cycle Multiplier
- High Endurance Non-volatile Memory Segments – 4/8/16/32KBytes of In-System Self-Programmable Flash program memory – 256/512/512/1KBytes EEPROM – 512/1K/1K/2KBytes Internal SRAM – Write/Erase Cycles: 10,000 Flash/100,000 EEPROM – Data retention: 20 years at 85℃/100 years at 25℃ – Optional Boot Code Section with Independent Lock Bits In-System Programming by On-chip Boot Program True Read-While-Write Operation
- Programming Lock for Software Security
- Atmel QTouch library support – Capacitive touch buttons, sliders and wheels – QTouch and QMatrix acquisition – Up to 64 sense channels
- Peripheral Features – Two 8-bit Timer/Counters with Separate Prescaler and Compare Mode – One 16-bit Timer/Counter with Separate Prescaler, Compare Mode, and Capture Mode – Real Time Counter with Separate Oscillator – Six PWM Channels – 8-channel 10-bit ADC in TQFP and QFN/MLF package Temperature Measurement – 6-channel 10-bit ADC in PDIP Package Temperature Measurement – Programmable Serial USART – Master/Slave SPI Serial Interface – Byte-oriented 2-wire Serial Interface (Philips I2C compatible) – Programmable Watchdog Timer with Separate On-chip Oscillator – On-chip Analog Comparator – Interrupt and Wake-up on Pin Change
- Special Microcontroller Features – Power-on Reset and Programmable Brown-out Detection – Internal Calibrated Oscillator – External and Internal Interrupt Sources – Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended Standby
- I/O and Packages – 23 Programmable I/O Lines – 28-pin PDIP, 32-lead TQFP, 28-pad QFN/MLF and 32-pad QFN/MLF
Datasheet
Alternative Parts
Common ATmega328P-AU alternatives overseas buyers search for:
Compliance & Export Codes
| Type | Details |
|---|---|
| RoHS | ROHS3 |
| ECCN | EAR99 |
| Type | Details |
|---|---|
| CNHTS | 8542319090 |
Frequently Asked Questions
What Is the Operating Voltage Range of the ATMEGA328P-AU, and How Does Its 10-Bit ADC Perform in Mixed-Signal Applications?
The ATMEGA328P-AU operates across a wide supply voltage range of 1.8V to 5.5V, making it compatible with both 3.3V and 5V power domains without additional regulation in many designs. The integrated 10-bit ADC provides a resolution of 1/1024 of the reference voltage — on a 5V reference, this gives approximately 4.88mV per LSB. This resolution is adequate for temperature sensing, potentiometer reading, light sensing, pressure transducer interfaces, and battery monitoring. The operating temperature range is -40°C to +85°C, qualifying it for industrial and outdoor applications that experience wide ambient temperature excursions.
How Is the ATMEGA328P-AU's On-Chip Memory Structured, and Is 32KB of FLASH Sufficient for Typical Firmware Applications?
The ATMEGA328P-AU provides three on-chip memory types: 32KB of self-programmable in-system FLASH for firmware storage, 1KB of EEPROM for non-volatile data retention across power cycles (such as calibration constants or device configuration), and internal SRAM (refer to datasheet for SRAM size). The 32KB FLASH supports projects of significant complexity — it is the same flash capacity used in the Arduino Uno, which runs full networking stacks and sensor fusion libraries. The in-system programmability means firmware can be updated via the SPI interface without removing the device from the board, simplifying field maintenance and manufacturing programming.
What Are the Key Processing Specifications of the ATMEGA328P-AU, and What Does Its 8-Bit AVR Core Mean for Embedded Application Suitability?
The ATMEGA328P-AU is an 8-bit microcontroller built on Microchip's (formerly Atmel) AVR RISC architecture, operating at a maximum CPU speed of 20MHz with a built-in oscillator. It features 32KB of in-system programmable FLASH program storage, 1KB of EEPROM, and a 10-bit ADC. Housed in a TQFP-32 (7x7mm) package with 23 I/O pins, it is well-suited for embedded control, sensor acquisition, motor control, communication protocol bridging, and IoT edge applications. The wide supply voltage range of 1.8V–5.5V accommodates both 3.3V and 5V system designs without additional level-shifting.
Sourcing Information
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