Part Number: ATXMEGA128A3U-MH

Manufacturer: Microchip Technology

Description: IC MCU 8/16BIT 128KB FLASH 64QFN

Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of ATXMEGA128A3U-MH

Datasheet  ATXMEGA128A3U-MH datasheet
Category Integrated Circuits (ICs)
Family Embedded – Microcontrollers
Manufacturer Atmel
Series AVR? XMEGA? A3U
Packaging Tray
Part Status Active
Core Processor AVR
Core Size 8/16-Bit
Speed 32MHz
Connectivity I2C, IrDA, SPI, UART/USART, USB
Peripherals Brown-out Detect/Reset, DMA, POR, PWM, WDT
Number of I/O 50
Program Memory Size 128KB (64K x 16)
Program Memory Type FLASH
EEPROM Size 2K x 8
RAM Size 8K x 8
Voltage – Supply (Vcc/Vdd) 1.6 V ~ 3.6 V
Data Converters A/D 16x12b; D/A 2x12b
Oscillator Type Internal
Operating Temperature -40°C ~ 85°C (TA)
Package / Case 64-VFQFN Exposed Pad
Supplier Device Package 64-QFN (9×9)


The ATXMEGA128A3U-MH is a microcontroller in the Atmel AVR XMEGA family, which is recognized for its low power consumption, strong performance, and extensive peripheral support. In this detailed overview, we will look at the ATXMEGA128A3U-MH microcontroller’s essential characteristics, capabilities, and applications.

Overview of ATXMEGA128A3U-MH

Introduction to the AVR XMEGA Family

The AVR XMEGA series is a unique line of microcontrollers known for their outstanding combination of low power consumption, high performance, and a wide range of peripheral functions. These microcontrollers, developed by Atmel, which is now part of Microchip Technology, are based on the AVR enhanced RISC architecture, distinguishing them in the realm of embedded systems.

AVR Enhanced RISC Architecture

The improved RISC (Reduced Instruction Set Computer) architecture is the foundation of the AVR XMEGA family’s prowess. Unlike other microcontrollers, which take numerous clock cycles to execute instructions, the AVR XMEGA can do so in a single clock cycle. Because of these exceptional capabilities, throughputs per megahertz reach one million instructions per second (MIPS). System designers can optimize power usage while retaining high processing speed thanks to such efficiency.

Rich Instruction Set and General-Purpose Registers

The ATXMEGA128A3U-MH’s AVR CPU has a large instruction set and 32 general-purpose working registers. Notably, all 32 registers are directly coupled to the arithmetic logic unit (ALU), allowing access to two independent registers in a single instruction processed in a single clock cycle. This architecture improves code efficiency and allows for much faster throughput than conventional single-accumulator or CISC (Complex Instruction Set Computer)-based microcontrollers.

Key Features of ATXMEGA128A3U-MH

The ATXMEGA128A3U-MH, an AVR XMEGA family member, has a slew of capabilities that make it an appealing solution for a wide range of embedded applications. Here are some of its important characteristics:

In-System Programmable Flash with Read-While-Write Capabilities

The microcontroller has flash memory that can be reprogrammed in-system and supports read-while-write. This ensures that the application firmware is updated and modified without disrupting its operation.

Rich Set of Peripherals

The ATXMEGA128A3U-MH has an extensive list of peripherals, including:

  • Internal EEPROM and SRAM are used to store data.
  • A DMA controller with four channels for fast data transport.
  • An event system with eight channels for inter-peripheral communication.
  • A programmable multilayer interrupt controller for interrupt management.
  • 50 I/O lines for general-purpose interface
  • A real-time counter (RTC) with a resolution of 16 bits for precise timekeeping.
  • Seven 16-bit timer/counters with comparison and PWM channels are provided.
  • Seven serial communication USARTs
  • TWIs (two-wire serial interfaces)
  • A USB 2.0 interface with full speed for diverse communication
  • There are three serial peripheral interfaces (SPIs).
  • Cryptographic engines AES and DES for secure data handling
  • For analog input, there are two 16-channel 12-bit ADCs with configurable gain.
  • A 12-bit DAC with two channels for analog output.
  • For precise signal monitoring, four analog comparators (ACs) with window mode are used.
  • A watchdog timer with a separate internal oscillator.
  • Internal oscillators with PLL and prescaler that are accurate
  • Voltage monitoring with programmable brown-out detection

Programming and Debugging Interfaces

  • The ATXMEGA128A3U-MH has several programming and debugging interfaces:
  • PDA (Program and Debug Interface): IEEE 1149.1 compliant JTAG interface with a fast two-pin interface for programming and debugging: Allows for boundary scanning, on-chip debugging, and programming.

Power-Saving Modes

The ATXMEGA128A3U-MH has five software-selectable power-saving modes to enhance power efficiency:

  • Idle Mode: Turns off the CPU while peripherals continue to work.
  • Power-Down Mode: This mode saves SRAM and register contents while also stopping oscillators.
  • Power-saving mode keeps the asynchronous real-time counter running while the rest of the device sleeps.
  • Standby Mode: Allows the external crystal oscillator to operate while the rest of the device sleeps, allowing for a quick startup.
  • Extended Standby Mode: Continues to run both the main oscillator and the asynchronous timer.

Capacitive Touch Integration

  • Atmel provides a free QTouch library for incorporating capacitive touch buttons, sliders, and wheels into your ATXMEGA128A3U-MH-based designs.

Power-Saving Modes for Efficient Operation

The ATXMEGA128A3U-MH’s power-saving settings are vital for managing energy consumption while retaining critical functionality. These modes allow you to tailor the operation of the microcontroller to the unique requirements of your application:

  • Idle Mode: The CPU suspends execution in this mode, while SRAM, the DMA controller, the event system, the interrupt controller, and all peripherals continue to work. This is useful when individual components must remain active while overall power is conserved.
  • Power-Down Mode: The power-down mode is the most energy-efficient mode. It saves SRAM and register data while also turning down all functions by silencing the oscillators. This state will be maintained by the microcontroller until an external trigger, such as a TWI (Two-Wire Interface) event, USB resume, pin-change interrupt, or reset, happens.
  • Power-Saving Mode: Power-Saving Mode keeps the asynchronous real-time counter running, allowing the application to maintain a timer base even when the rest of the device is powered off. When exact timing is necessary, this can be advantageous.
  • Standby Mode: The external crystal oscillator continues to work in Standby mode while the rest of the microcontroller goes to sleep. This configuration enables fast startup from the external crystal while simultaneously minimizing power consumption.
  • Extended Standby Mode: When in Extended Standby mode, both the main oscillator and the asynchronous timer remain active, allowing for a balance between speedy startup and power efficiency.
  • These power-saving modes help to increase battery life, minimize heat output, and enable the ATXMEGA128A3U-MH to survive in energy-constrained environments.

Finally, the AVR XMEGA ATXMEGA128A3U-MH microcontroller is a flexible and powerful choice for a variety of embedded applications. Its unique combination of performance, power efficiency, and a variety of peripheral capabilities makes it an excellent choice for applications that require both processing speed and energy utilization to be maximized. Engineers and developers can create new and efficient embedded systems with the support of Atmel’s extensive development tools and resources.


Finally, the ATXMEGA128A3U-MH microcontroller, a shining star in the AVR XMEGA family, offers exceptional performance, versatility, and power efficiency. Because of its vast feature set, effective power management, and seamless integration capabilities, it is the appropriate choice for a wide range of projects.

It is now up to you to fully grasp its potential. Whether you’re a seasoned engineer or a passionate hobbyist, the ATXMEGA128A3U-MH can bring your innovative ideas to life. It is also competitively priced from ICRFQ, a well-known Chinese electronic component vendor.

Don’t put it off any longer. You can delve into the world of innovation with the ATXMEGA128A3U-MH and ICRFQ. Create, discover, and influence the future of embedded technology – your adventure starts today, and the possibilities are limitless.

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