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    PIN and Block DIAGRAM

    What is ATMEGA32U4-AU?

    ATMEGA32U4-AU is CMOS 8-bit low power microcontroller design based on AVR enhanced RISC structure using microchip technology adding self-programmable 32Kb flash program memory, 1KB EEPROM, 2.5KB SROM, 12 channel, USB 2.0 low speed or full speed module, JTAG interface for on-chip-debug and 10-bit analogue to digital convertor. By allowing the system designer to provide optimization to processing speed and power consumption, the ATmega32U4 achieves throughputs approaching 1 MIPS per MHz by implementing powerful instructions in a single clock cycle.

    ATMEGA32U4-AU is designed and manufactured with Atmel’s nonvolatile high-density memory technology. The ISP flash in chip let the program to be reprogrammed in-system by using SPI serial interface. the Atmel ATmega16U2 is a well built powerful microcontroller that offers a highly flexible and cost-effective solution to many embedded control applications by merging In-System Self-Programmable Flash with 8-bit RISC CPU on a monolithic chip.

    The ATmega32U4-AU is supported with a full suite of program and system development tools including in-circuit emulators, C compilers, evaluation kits, macro assemblers,  and program debugger/simulators.

    Pin Configuration

    PIN Name PIN Description
    VCC Digital supply voltage
    GND Ground
    PORT B 8-bit bi-directional I/O ports with internal pull-up resistors
    PORT C 8-bit bi-directional I/O ports with internal pull-up resistors
    PORT D 8-bit bi-directional I/O ports with internal pull-up resistors
    PORT E 8-bit bi-directional I/O ports with internal pull-up resistors
    PORT F Serves as analogue inputs to the A/D Converter and 8-bit bi-directional I/O ports
    D- Negative Full Speed/Low-Speed USB Data Upstream Port
    D+ Positive Full Speed/Low-Speed USB Data Upstream Port
    UGND USB pads Ground
    UVCC USB Pads Internal Regulator Input supply voltage
    VBUS Monitor Input USB VBUS
    RESET Reset Input
    XTAL1 Input to the internal clock operating circuit and Input to the inverting Oscillator amplifier.
    XTAL2 The output from the inverting Oscillator amplifier
    AVCC AVCC is the supply voltage pin (input) for all the A/D Converter channels.
    AREF Analogue reference pin (input) for the A/D Converter


    • Low power AVR 8-bit microcontroller with high performance
    • Non-volatile data memories and program
    • In-system self-programmable flash of 32KB
    • EEPROM of 1KB
    • Internal SROM of 2.5KB
    • 10,000 Flash/ 100,000 EEPROM write/erase cycles
    • 20 years at 85°C/ 100 years at 25°C data retention
    • Optional Boot Code Section with Independent Lock Bits
    • Software security programming lock
    • JTAG Interface
    • Full Speed/low speed 2.0 USB device module
    • Endpoint 0 for Control Transfers: up to 64-bytes
    • Complies fully with Universal Serial Bus Specification REV 2.0
    • Supports data transfer rates up to 12Mbit/s and 1.5Mbit/s
    • Fully independent 832 bytes USB DPRAM for endpoint memory allocation
    • Suspend/Resume Interrupts
    • Microcontroller reset on USB Bus Reset without detaching
    • USB Bus Connection/Disconnection on Microcontroller Request
    • 48MHz from PLL for Full-speed Bus Operation
    • The crystal-less operation for Low-Speed mode
    • Power-on Reset and Programmable Brown-out Detection
    • 26 Programmable I/O Lines
    • Internal clock Prescaler and On-the-fly Clock Switching (Int RC / Ext Osc)
    • Six Sleep Modes: Idle, ADC Noise Reduction, Power-save, Power-down, Standby, and Extended StandbyInternal Calibrated Oscillator
    • Power-On Reset and Programmable Brown-out Detection
    • 44-lead TQFP Package, 10x10mm
    • Operates at 2.7 to 5.5 voltages
    • Operate at -40°C to +85°C temperature
    • The maximum frequency of 8MHz at 2.7V and 16MHz at 4.5V – Industrial Range


    ATMEGA32U4-AUR, ATmega32U4-16MU; ATMEGA32U4-MU;  


    There are many applications of ATMEGA32U4-AU in embedded design, development and control systems such as

    • Automation and control process
    • Consumer electronics
    • Senors and instrumentation
    • Appliances
    • Monitoring medical equipment
    • Circuitry to control processes.
    • Motor control
    • Rectification
    • Power regulation
    • DAC applications.


    ATMEGA32U4-AU Related Products Prices

    PartsMfr.DescriptionStockPricesBuy Now


    AtmelIC MCU 8BIT 32KB FLASH 44TQFP7500$2.965 Lowest
    ATMEGA32U4-MUAtmelISP Flash and USB Controller10$3.401 Lowest
    ATMEGA16U2-AUAtmelIC MCU 8BIT 16KB FLASH 32TQFP5000$2.949 Lowest
    ATMEGA16U4-MUAtmelIC MCU 8BIT 16KB FLASH 44QFN2080$3.780 Lowest
    ATMEGA32U4-MUfAtmel2296$3.832 Lowest



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