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ATxmega32A4U-AU

MCHPATxmega32A4U-AU

Microchip Technology
Smaller-footprint XMEGA with integrated USB for lower pin-count USB applications.
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Overview

The ATxmega32A4U-AU is a high-performance, low-power 8/16-bit AVR microcontroller featuring 32KB of flash memory and an integrated USB 2.0 full-speed device controller. It operates at speeds up to 32MHz and includes a four-channel DMA controller and an eight-channel event system to offload the CPU during complex peripheral interactions. This specific 'U' variant is optimized for applications requiring a smaller 44-pin TQFP footprint while maintaining native USB connectivity without external crystals.

Why Choose This Part

The XMEGA architecture provides a significant performance boost over standard megaAVR parts through its Event System, which allows peripherals to communicate directly without CPU intervention. The internal 32MHz oscillator and built-in USB PLL enable crystal-less USB operation, reducing total BOM cost and PCB complexity. Furthermore, the inclusion of a DMA controller ensures high-speed data transfers for the 32 USB endpoints and serial interfaces.

Applications

USB Peripheral Devices
Ideal for creating custom HID, CDC, or Mass Storage Class devices like specialized keyboards, mouse controllers, or bridge interfaces.
Industrial Data Loggers
Uses the integrated DMA and event system to capture sensor data efficiently while the USB interface provides high-speed data offloading.
Battery-Powered Instrumentation
Leverages multiple sleep modes and low-power run currents (0.9mA at 2MHz) for handheld measurement tools.
Motor and Waveform Control
Utilizes the five 16-bit timer/counters and Advanced Waveform Extension (AWeX) for precise PWM and motor control tasks.

Key Specifications

Speed 32MHz
RAM Size 4K x 8
Core Size 8/16-Bit
EEPROM Size 1K x 8
Peripherals Brown-out Detect/Reset, DMA, POR, PWM, WDT
Connectivity I2C, IrDA, SPI, UART/USART, USB
Mounting Type Surface Mount
Number of I/O 34
Core Processor AVR
Package / Case 44-TQFP
Data Converters A/D 12x12b; D/A 2x12b
Oscillator Type Internal
Program Memory Size 32KB (16K x 16)
Program Memory Type FLASH
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 44-TQFP (10x10)
Voltage - Supply (Vcc/Vdd) 1.6V ~ 3.6V

Getting Started

Development is supported by Microchip Studio (formerly Atmel Studio) and the MPLAB X IDE using the XC8 compiler. For hardware evaluation, the Atmel XMEGA-A4U Xplained Board is a common starting point, and programming can be performed via the PDI (Program and Debug Interface) using an Atmel-ICE or AVR ISP mkII programmer.

Also Consider

ATmega32U4-AU MCHPMicrochip Technology - Standard megaAVR alternative with a more mature ecosystem and 5V operation support, though it lacks the XMEGA Event System.
ATSAMD21G18A-AU MCHPMicrochip Technology - A 32-bit ARM Cortex-M0+ option providing higher processing power and larger memory if the 8-bit AVR architecture is too limiting.

Categories

Microcontrollers > AVR
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