AT90USB82-16MU - 16MHz USB AVR MCU | Microchip
N.º de pieza: AT90USB82-16MU ✓ ActivoAT90USB82-16MU Descripción general
An 8-bit microcontroller is a compact embedded-processing device that executes instructions from a program memory and interacts with external hardware through general-purpose I/O pins. The AT90USB82 belongs to the AVR family and the broader AT90USB product group, combining a RISC architecture, USB device connectivity, and read-while-write flash in a single device. This combination makes it suitable for USB-connected peripheral, human-interface, and firmware-update applications.
According to the Microchip product page, the device provides 22 general-purpose I/O lines, 32 general-purpose working registers, and two flexible timer/counter blocks with compare and PWM capabilities. It supports 135 instructions, with most instructions completing within a single clock cycle, and can execute up to 16 million instructions per second at 16 MHz. Its operating voltage range of 2.7 V to 5.5 V supports both 3.3 V and 5 V system designs.
Program development is supported through 8 KB of ISP flash with read-while-write capability, 512 bytes of EEPROM for nonvolatile data, 512 bytes of SRAM, and an on-chip DebugWire interface. USB firmware can use the device's DFU bootloader capability, while the AVR architecture and DebugWire interface support in-circuit debugging. Detailed peripheral pin assignments are not included in the supplied source data.
Typical uses include low-speed USB adapters, keyboard and mouse controllers, HID peripherals, industrial interface modules, and USB-connected embedded accessories. The 5 V by 5 mm VQFN package minimizes board area, but its exposed-pad construction requires careful PCB thermal design and a suitable copper landing area.
When designing the layout, place the USB transceiver and its supporting components near the package, maintain the required impedance-controlled USB traces, and provide stable decoupling at each supply pin. Because this is a fine-pitch VQFN, verify pad dimensions, paste stencil apertures, solder mask clearance, and the exposed-pad paste pattern against the manufacturer footprint before releasing artwork.
This page consolidates distributor availability, verified device specifications, package information, and practical engineering guidance. It also identifies the scarcity of confirmed pin-to-pin replacements, helping designers distinguish true drop-in alternatives from related AVR devices that require schematic, firmware, or PCB changes.
Alternativas directas para AT90USB82-16MU — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con AT90USB82-16MU (mismo factor de forma y huella) — difiere en Package, RoHS Status.
ATMEGA8U2-MU
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Ver hoja de datos →AT90USB82-16MU Valores máximos y características eléctricas
| Microcontroller Type | 8-bit AVR RISC-based microcontroller |
| Frecuencia de reloj máxima | 16 MHz |
| Maximum Throughput | 16 MIPS at 16 MHz |
| Program Memory | 8 KB self-programming ISP flash |
| Flash Read-While-Write | Supported |
| EEPROM | 512 bytes |
| SRAM | 512 bytes |
| General-Purpose I/O Lines | 22 lines |
| General-Purpose Working Registers | 32 registers |
| Timer/Counter Blocks | 2 flexible timer/counters with compare and PWM |
| Operating Voltage | 2.7 V to 5.5 V |
| Instruction Set | 135 AVR instructions |
| USB Interface | USB device connectivity |
| Bootloader | USB DFU bootloader |
| Debug Interface | DebugWire on-chip debug |
| Encapsulado | 32-pin VQFN, 5 mm x 5 mm |
| Tipo de montaje | Surface mount |
| Estado RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
Guía de configuración de pines de AT90USB82-16MU 32-pin vqfn, 5 mm x 5 mm
Configuración de pines para AT90USB82-16MU (encapsulado 32-pin vqfn, 5 mm x 5 mm). Este CI digital incluye GPIO, interfaces de comunicación (UART, SPI, I2C) y pines de alimentación. Consulte la hoja de datos del fabricante para conocer las funciones alternativas de los pines y las opciones de configuración. Esencial para el diseño de sistemas embebidos y el diseño de PCB.
No hay datos detallados de patillaje disponibles para AT90USB82-16MU.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
AT90USB82-16MU es adecuado para 6 aplicacións: USB HID Peripherals, USB Keyboard and Mouse Controllers, USB-to-Serial Bridge Modules, USB DFU Firmware Update Products, Industrial USB Interface Modules, USB-Connected Configuration and Programming Tools.
USB HID Peripherals
The AT90USB82-16MU fits compact USB human-interface devices because it combines USB connectivity with 22 general-purpose I/O lines at a 16 MHz clock speed. Its two timer/counter blocks can drive indicators, decode inputs, or generate PWM for status lighting without an external timer. The 8 KB of read-while-write ISP flash provides enough space for a compact HID descriptor and control firmware, although code size must be monitored carefully. Use a 3.3 V or 5 V supply arrangement within the documented 2.7 V to 5.5 V operating range and verify USB signal details against the manufacturer datasheet before schematic release.
Recomendado
USB Keyboard and Mouse Controllers
A 16 MHz AVR core with 135 instructions and 512 bytes of SRAM is appropriate for scanning a keyboard matrix or decoding incremental mouse sensors in a USB peripheral. The 22 available I/O lines simplify matrix-row and column sensing, while the two timer/counter blocks can support debouncing intervals or sensor timing. Because only 8 KB of flash is available, the designer should select a compact USB stack and remove unused features early. Firmware changes, USB enumeration behavior, and exact peripheral pin mapping must be validated before the AT90USB82-16MU is committed to a production keyboard or pointing device.
Recomendado
USB-to-Serial Bridge Modules
The AT90USB82-16MU can serve as the controller in a USB-to-serial adapter by using its USB device interface with a UART-capable hardware configuration. Its 16 MHz processing rate provides sufficient headroom for byte-rate conversion and basic framing, and the 22 I/O lines provide control signals for transceiver direction and status indication. Firmware must implement the USB protocol, buffering, and line coding within the available 8 KB flash and 512-byte SRAM budget. Designers should also account for the exposed-pad package and place all bypass capacitors close to the supply pins to limit USB-interface supply disturbance.
Recomendado
USB DFU Firmware Update Products
The integrated USB DFU bootloader makes the AT90USB82-16MU well suited to products that need a standardized firmware update path over USB. Firmware can be updated from a 2.7 V to 5.5 V operating system without exposing a separate programming connector, reducing enclosure complexity and assembly cost. The device's read-while-write ISP flash supports flexible code organization, while DebugWire provides an on-chip debugging route during development. Production designs must protect the bootloader, validate firmware signatures or checksums, and ensure the 8 KB flash limit is not exceeded after boot code and application code are combined.
Recomendado
Industrial USB Interface Modules
The AT90USB82-16MU supports compact industrial interface modules that connect sensors, switches, or service controls to a USB host. Its 22 general-purpose I/O lines can monitor discrete inputs and drive control outputs, while the 16 MHz clock supports deterministic polling loops and protocol framing. The 2.7 V to 5.5 V operating range accommodates 3.3 V and 5 V interface electronics. For industrial deployments, add input protection, isolation, or level translation as required; the microcontroller alone does not provide those functions. Validate ESD, conducted-noise, and grounding performance at the product level rather than treating the MCU specifications as complete EMC compliance evidence.
Recomendado
USB-Connected Configuration and Programming Tools
The AT90USB82-16MU can act as a USB-connected configuration controller for a sensor, actuator, or programmable accessory. Its 22 I/O lines provide parallel control channels, and the two timer/counters support timing-sensitive output sequencing. The DebugWire interface is useful during development, while USB DFU permits field firmware revisions through the same connector used for normal operation. With only 512 bytes of SRAM and 8 KB of flash, the design should use interrupt-driven transfers and avoid large buffering layers. A production implementation also needs a documented recovery path and verified USB enumeration behavior across the host operating systems expected in the field.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para AT90USB82-16MU — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATMEGA8U2-MU |
|---|---|---|
| Package | 32-VQFN (5x5) | 32-QFN (5x5) |
| Brand | Microchip Technology | Microchip Technology |
| Architecture | 8-bit AVR RISC | 8-bit AVR |
| Maximum Clock Frequency | 16 MHz | 16 MHz |
| Program Memory | 8 KB ISP flash | 8 KB flash |
| USB Interface | USB device with DFU bootloader | USB device |
Diferenciadores clave
- USB-focused AVR with compact memory configuration (frente a ATMEGA8U2-MU)
- Read-while-write flash support (frente a ATMEGA8U2-MU)
- Low operating-voltage floor (frente a ATMEGA8U2-MU)
Notas de diseño
The 32-pin 5 mm by 5 mm VQFN requires a land pattern matched to the manufacturer footprint, including the exposed thermal pad. Confirm pad dimensions, solder-mask clearance, and stencil paste proportions against the official package drawing. Program the exposed-pad paste volume deliberately rather than assuming a full-copper flood is sufficient for reliable void control.
Place low-ESR bypass capacitors adjacent to the supply pins and keep USB data-trace return paths continuous over the plane beneath the interface. The AT90USB82-16MU operates from 2.7 V to 5.5 V, so the complete board must keep transients and IR-drop within the limits stated in the manufacturer datasheet. Verify supply current during USB enumeration and suspend rather than designing the rail only for steady-state idle operation.
Do not treat a related 32-pin AVR as a substitute without checking USB pins, power pins, programming signals, and peripheral assignments. The available 8 KB of flash and 512 bytes of SRAM also require disciplined firmware sizing, including USB stack code, bootloader features, and application buffers. Review the final binary size and stack headroom rather than estimating them during schematic design.
Información de cumplimiento
The supplied source results do not explicitly state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 status. No certification claim has been inferred.
