AT90USB1286-MU - 16MHz 128KB USB AVR MCU | Microchip
MPN： AT90USB1286-MU ✓ 啟用中AT90USB1286-MU 概覽
An AVR microcontroller is a compact embedded-control processor based on the reduced instruction set computer architecture. The AT90USB1286 family combines general-purpose digital control, USB communications, serial interfaces, timers, and analog conversion in one device. It belongs to the hierarchy of 8-bit microcontroller, RISC microcontroller, embedded processor, and semiconductor. USB integration allows the same device to manage peripheral control while presenting a standard interface to a host computer.
The principal features include 128 KB of ISP flash with read-while-write capability, 4 KB of EEPROM, 8 KB of SRAM, and 48 general-purpose I/O lines. Four flexible timer/counter blocks provide compare and PWM functions, while USART and byte-oriented 2-wire serial interfaces support external sensors and peripherals. An 8-channel, 10-bit ADC provides analog measurement, and the integrated USB controller supports USB 2.0 full-speed operation up to 12 Mbit/s and low-speed operation up to 1.5 Mbit/s.
The enhanced RISC architecture supports throughput approaching 1 MIPS per MHz, giving the AT90USB1286-MU up to 16 MIPS at 16 MHz. On-chip USB functionality removes the need for a separate USB interface controller in host-managed peripherals. Read-while-write flash supports firmware updates, while EEPROM preserves calibration, configuration, or user data independently of the main program memory. The MCU also includes real-time counter, USART, JTAG debugging, and timer resources for connected embedded products.
Typical applications include USB-connected human-interface devices, keyboard controllers, test and measurement equipment, data-acquisition systems, USB-to-serial adapters, industrial control modules, and compact consumer peripherals. The 48 I/O lines provide flexibility for sensors, indicators, communication buses, and control signals, while the internal ADC reduces the component count for analog front ends that do not require more than 10-bit resolution.
When designing around the AT90USB1286-MU, verify USB signal routing, supply decoupling, and exposed-pad thermal design against the manufacturer datasheet. Provide a compliant USB connection and ensure the firmware budget fits the 128 KB flash and 8 KB SRAM limits. Confirm the operating voltage and industrial-temperature requirements for the assembled product before releasing the PCB design.
This page organizes the core memory, USB, analog, timing, and package characteristics while adding practical application guidance, direct engineering comparisons, and design considerations that help engineers evaluate the AT90USB1286-MU before schematic capture and PCB layout.
直接替換替代品，適用於 AT90USB1286-MU — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AT90USB1286-MU （相同外形與佔位） — 差異在於 Package, General-Purpose Working Registers, Serial Interfaces, Real-Time Counter, SRAM.
AT90USB1286-16MU
✅ 直接替換📋 參考替代品（不在目錄中）
AT90USB1286-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AT90USB1287-16MU
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AT90USB1287-AU
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AT90USB646-MU
✅ 直接替換聯絡詢價
查看資料表 →AT90USB1286-MU 最大額定值與電氣特性
| Microcontroller Type | 8-bit AVR RISC-based microcontroller |
| Maximum Clock Speed | 16 MHz |
| Flash Memory | 128 KB |
| Flash Organization | 128K x 8 bits |
| EEPROM Memory | 4 KB |
| SRAM | 8 KB |
| General-Purpose I/O Lines | 48 |
| General-Purpose Working Registers | 32 |
| 工作電源電壓 | 2.7 V to 5.5 V |
| ADC Resolution | 10 bits |
| ADC Channels | 8 channels |
| Maximum CPU Throughput | Up to 16 MIPS |
| USB Standard | USB 2.0 |
| USB Full-Speed Data Rate | 12 Mbit/s |
| USB Low-Speed Data Rate | 1.5 Mbit/s |
| Timer/Counters | 4 |
| Timer PWM Support | Yes |
| Serial Interfaces | USART and byte-oriented 2-wire serial interface |
| Programming Interface | ISP and JTAG |
| 封裝 | 64-QFN (9 x 9 mm) |
| Package Type | Surface-mount QFN with exposed pad |
| Temperature Grade | Industrial temperature |
AT90USB1286-MU surface-mount qfn with exposed pad 腳位配置指南
AT90USB1286-MU（surface-mount qfn with exposed pad 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： AT90USB1286-MU.
請參閱 資料表 以查看完整腳位配置。
典型應用
AT90USB1286-MU 適用於 6 應用s: USB Human-Interface Device Controller, USB Data-Acquisition Controller, USB-to-Serial Industrial Adapter, Embedded Test and Measurement Instrument, USB Connected Sensor Hub, USB Audio Control Interface.
USB Human-Interface Device Controller
The AT90USB1286-MU fits a USB keyboard, control surface, or other human-interface device because it combines USB 2.0 full-speed operation with 48 GPIO lines and four timer/counters. According to the Microchip product page, the 128 KB flash supports a HID firmware stack, while 8 KB of SRAM accommodates USB descriptors, endpoint handling, debounce state, and communication buffers. The 16 MHz core provides up to 16 MIPS, and the exposed-pad QFN construction supports compact desktop or portable accessories. Pin assignment must follow the manufacturer package drawing, while USB differential routing, decoupling, and device enumeration require board-level validation.
推薦
USB Data-Acquisition Controller
The AT90USB1286-MU is suitable for a USB-connected data-acquisition controller because it integrates an 8-channel, 10-bit ADC with USB full-speed communication and 48 GPIO lines. The 16 MHz AVR core can handle sensor scanning, filtering, sample buffering, and host command processing, while 8 KB of SRAM provides room for acquisition state and USB transfer buffers. The manufacturer documents a 2.7 V to 5.5 V operating range and four timer/counters for trigger or sample-rate functions. Practical designs should establish the analog reference, input filtering, grounding, USB signal integrity, and calibration strategy from the device documentation.
推薦
USB-to-Serial Industrial Adapter
The AT90USB1286-MU works well in a USB-to-serial bridge because it combines a full-speed USB device controller with an on-chip USART and byte-oriented 2-wire interface. The 128 KB flash can support protocol conversion, configuration handling, and firmware updates, while the 48 GPIO lines can expose status indicators, control signals, or isolated interface logic. According to the Microchip product page, the device includes EEPROM for persistent configuration and read-while-write flash for field-update workflows. A robust adapter also needs ESD protection, ground design suitable for the external interface, USB enumeration support, and industrial environmental validation.
推薦
Embedded Test and Measurement Instrument
The AT90USB1286-MU can form the control core of a USB-connected test or measurement instrument that combines digital control with limited analog acquisition. Its 8-channel 10-bit ADC supports basic voltage measurements, four timer/counters support timing or PWM functions, and the USART expands connectivity to external instruments. The 16 MHz processing rate and 128 KB flash provide adequate resources for a USB command interface, measurement state machine, calibration table, and communications buffer. According to the manufacturer product page, the part also supports ISP and JTAG, enabling production programming and on-chip debugging for development and manufacturing workflows.
推薦
USB Connected Sensor Hub
The AT90USB1286-MU suits a compact sensor hub that must collect local measurements and present them to a host over USB. Its 48 GPIO lines can support digital sensors, interrupt inputs, relay or indicator controls, and multiple I2C or SPI peripherals, while the integrated ADC handles up to eight analog channels. The 4 KB EEPROM can retain node identification or calibration values, and the 128 KB flash supports application firmware and USB host protocols. According to the Microchip product page, the MCU provides read-while-write flash, making field updates possible. Thermal and electromagnetic design remain critical when combining high-current peripherals, long cables, and sensitive analog measurement.
推薦
USB Audio Control Interface
The AT90USB1286-MU can implement a USB control interface for consumer audio equipment, programmable fixtures, or powered speaker accessories. USB full-speed connectivity handles enumeration and control traffic, while timer/counter PWM outputs, the USART, and 48 GPIO lines support mode buttons, indicators, displays, and external codecs. The 128 KB flash and 8 KB of SRAM accommodate a control protocol, descriptor data, and USB endpoint buffers. According to the Microchip product page, the device offers four timers with compare and PWM functions. Designers should separate noisy power paths from analog references, verify USB signal integrity, and use the exposed pad effectively for thermal dissipation.
推薦
推薦產品摘要
工程參考資料，適用於 AT90USB1286-MU — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AT90USB1286-16MU | AT90USB1286-AU | AT90USB1287-16MU | AT90USB1287-AU | AT90USB646-MU |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (9 x 9 mm) | 64-QFN (9 x 9 mm) | 64-QFN (9 x 9 mm) | 64-QFN (9 x 9 mm) | 64-QFN (9 x 9 mm) | 64-QFN (9 x 9 mm) |
| Maximum Clock Speed | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz | 16 MHz |
| Architecture | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC | 8-bit AVR RISC |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB | 128 KB | 64 KB |
| USB Support | USB 2.0 full-speed and low-speed device | USB 2.0 full-speed and low-speed device | USB 2.0 full-speed and low-speed device | USB device with additional family-level USB functionality | USB device with additional family-level USB functionality | USB 2.0 device |
主要差異化特點
- Twice the flash memory of the AT90USB646-MU family alternative (對比AT90USB646-MU)
- Native USB device feature set for host-connected peripherals (對比AT90USB1287-16MU)
- Substantial processing and memory headroom (對比AT90USB646-MU)
- High peripheral integration in one 64-QFN device (對比AT90USB646-MU)
設計說明
Use the manufacturer AT90USB1286 package drawing and land pattern for the 64-QFN (9 x 9 mm) device, including the exposed-pad connection and thermal-via arrangement. Keep the USB D+ and D+ pair routed as a short, impedance-controlled differential pair away from clocks, switching nodes, and analog inputs. Place the USB protection components close to the connector or board entry point. The exposed pad should be tied and stitched according to the manufacturer grounding recommendation rather than treated as an optional thermal feature.
Plan the 2.7 V to 5.5 V supply path so that the AT90USB1286-MU receives clean power during USB attachment, bus-powered operation, and transient events. Place the required input and bulk capacitors at the device's supply pins using the datasheet's recommended values and layout. Keep analog and digital return currents separated as far as the board construction allows, and use the ADC reference and analog-ground connections according to the pin descriptions. Verify startup and brownout behavior across the complete supply range before production release.
Do not assume that all 90USB-family members have identical USB roles, despite sharing a package family. Check the USB controller table, pin-description table, and ordering information for every proposed substitution. Firmware must also respect the 128 KB flash, 8 KB SRAM, endpoint, and bootloader limits of the AT90USB1286-MU. A replacement that enumerates but exposes different host, OTG, or peripheral behavior may still require changes to application code, descriptors, and the production programming procedure.
Estimate the junction-temperature rise from actual dissipation and the package thermal resistance specified by Microchip rather than relying on the QFN outline alone. The principal heat sources can include the AVR core, analog circuitry, USB transceiver, and attached external loads whose current also flows through board copper. Use the exposed pad and surrounding copper or vias to spread heat, but preserve the recommended quiet return paths for sensitive signals. Recalculate thermal performance at the highest specified ambient temperature and maximum processor activity.
合規資訊
Use the manufacturer product page and current material-compliance documentation to confirm RoHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive qualification status.
