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ATMEGA16U2-MU

MCHPATMEGA16U2-MU

Microchip Technology
USB-enabled AVR with different resource balance for simple USB-serial or device tasks.
Active16,439 in stock
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Overview

The ATMEGA16U2-MU is a high-performance, low-power 8-bit AVR RISC-based microcontroller featuring 16KB of ISP flash memory and an integrated USB 2.0 full-speed device module. Designed to eliminate the need for external crystal oscillators in some USB applications, it provides a compact solution for bridging serial communications to USB interfaces.

Why Choose This Part

The primary advantage is the integrated USB 2.0 controller which supports up to 5 endpoints and includes a dedicated PLL for high-precision timing. With 22 I/O pins and 16MHz operation in a small 32-VFQFN package, it offers a space-efficient way to add USB functionality to embedded systems without requiring a separate bridge IC.

Applications

USB-to-Serial Bridges
Commonly used as the interface chip on development boards to bridge UART communication from a primary MCU to a host PC via USB.
HID Input Devices
Ideal for creating custom USB keyboards, mice, or joysticks using the built-in USB device stack.
USB Legacy Port Emulation
Updating older RS-232 or TTL serial designs to modern USB connectivity without changing the host software architecture.

Key Specifications

Speed 16MHz
RAM Size 512 x 8
Core Size 8-Bit
EEPROM Size 512 x 8
Peripherals Brown-out Detect/Reset, POR, PWM, WDT
Connectivity SPI, UART/USART, USB
Mounting Type Surface Mount
Number of I/O 22
Core Processor AVR
Package / Case 32-VFQFN Exposed Pad
Oscillator Type Internal
Program Memory Size 16KB (8K x 16)
Program Memory Type FLASH
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 32-VQFN (5x5)
Voltage - Supply (Vcc/Vdd) 2.7V ~ 5.5V

Getting Started

Engineers typically use the Microchip Studio IDE and the AVR GCC toolchain for firmware development. The part is compatible with the LUFA (Lightweight USB Framework for AVRs) library, which provides a comprehensive suite of USB class drivers. Hardware programming is performed via the SPI interface using an AVR ISP mkII or similar in-circuit debugger.

ATMEGA16U2 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Stock
ATMEGA16U2-MU (this part) VFQFN-32 16,439
ATMEGA16U2-AU TQFP-32 25,258

Also Consider

FT232RL FTDI Chip - A dedicated USB-to-UART bridge that requires no firmware development, though it lacks the general-purpose GPIO flexibility of the AVR core.
SAM D11 MCHPMicrochip Technology - A modern 32-bit ARM Cortex-M0+ alternative with integrated USB and more advanced analog peripherals at a similar pin count.
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