ATmega32U4 - Microcontroller Microchip - Free user manual and instructions
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| Product Type | Microcontroller |
| Manufacturer | Microchip Technology |
| Model | ATmega32U4 |
| Package Type | 44-pin QFN (7x7 mm) |
| Dimensions | 7.0 mm x 7.0 mm x 0.9 mm |
| Weight | 0.5 g (typical) |
| Supply Voltage | 2.7 V to 5.5 V |
| Operating Temperature | -40°C to +85°C |
| CPU Architecture | 8-bit AVR RISC |
| Maximum Clock Speed | 16 MHz |
| Flash Memory | 32 KB |
| SRAM | 2.5 KB |
| EEPROM | 1 KB |
| USB Interface | Full-speed USB 2.0 (device/host) |
| Digital I/O Pins | 26 |
| Analog Input Pins | 13 (10-bit ADC) |
| PWM Outputs | 7 |
| Maintenance | No user maintenance required; keep dry and clean |
| Safety Precautions | Observe ESD handling procedures; operate within voltage limits |
| Spare Parts & Repairability | Not individually repairable; replace entire device if defective |
Frequently Asked Questions - ATmega32U4 Microchip
How do I program the ATmega32U4?
You can program it via USB using the Arduino IDE (with the appropriate core) or with AVR programmers like the USBasp. The device supports DFU bootloader for USB flashing.
What is the supply voltage range?
The ATmega32U4 operates from 2.7 V to 5.5 V. It has an internal voltage regulator for USB operation, but an external 3.3 V supply can be used.
Does the ATmega32U4 have built-in USB?
Yes, it features a full-speed USB 2.0 interface that can act as either device or host. The internal USB transceiver is integrated.
What is the maximum clock speed?
The maximum clock speed is 16 MHz at 5 V. At lower voltages, the speed is reduced; see the datasheet for details.
What are the memory sizes?
It has 32 KB of Flash memory, 2.5 KB of SRAM, and 1 KB of EEPROM. The bootloader occupies 4 KB of Flash.
How many I/O pins are available?
There are 26 digital I/O pins, of which 13 are analog inputs (10-bit ADC). Some pins have alternate functions like PWM (7 channels).
Can I power the board via USB?
Yes, the ATmega32U4 can be powered directly from a USB port (5 V). It has an internal 3.3 V regulator for the core and USB logic.
What development tools are supported?
It is supported by Arduino IDE (Leonardo board), AVR Studio, PlatformIO, and AVR-GCC. For USB programming, use the DFU programmer.
What is the pinout of the ATmega32U4?
The 44-pin QFN package has pins for power (VCC, GND, VUSB), USB (D+, D-), digital I/O (PB, PC, PD, PE, PF), analog (PF0-5, PD4/6), and reset. Refer to the datasheet for exact mapping.
What is the recommended operating temperature range?
The temperature range is -40°C to +85°C for industrial grade. This makes it suitable for automotive and outdoor applications.
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USER MANUAL ATmega32U4 Microchip
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Product information
Brand : Microchip
Model : ATmega32U4
Category : Microcontroller