AT90USB646-MU - 16MHz USB AVR MCU 64-QFN | Microchip
料号： AT90USB646-MU ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
AT90USB646-MU 概述
A microcontroller is a programmable semiconductor that integrates a processor core, nonvolatile program memory, data memory, and peripherals into one compact device. The AVR family belongs to the embedded-controller hierarchy: general-purpose MCU, embedded controller, processor, and semiconductor. AT90USB646-MU targets systems that need local control logic combined directly with USB connectivity, avoiding a separate USB interface controller when the firmware and host software support the AVR platform.
Verified product information identifies read-while-write ISP flash, 2 KB EEPROM, 4 KB SRAM, 48 I/O lines, 32 general-purpose working registers, a real-time counter, four flexible timer/counters, PWM, USART, and a byte-oriented two-wire serial interface. Its integrated USB controller supports low-speed and full-speed USB 2.0 operation. These resources make the MCU suitable for compact USB-connected control, data-acquisition, human-interface, bootloader, and embedded peripheral products.
The 16 MHz operating frequency provides the timing basis for the AVR core, while the 64 KB flash region stores firmware and 4 KB SRAM supports runtime data. Compared with a larger AVR controller, the AT90USB646 remains resource-focused, yet its 48 I/O lines and USB integration offer substantial peripheral connectivity. Designers must also account for the exposed-pad package, USB signal routing, decoupling, clock stability, and programming requirements.
Typical implementations include USB HID controllers, DFU-capable embedded products, USB-to-serial equipment, data loggers, keyboard and control-panel firmware, and small industrial or instrumentation modules. It is particularly useful when a compact, single-chip design needs both deterministic embedded processing and USB device connectivity.
PCB implementation requires a 64-QFN land pattern, adequate thermal copper, and short USB differential routing. The supplied data does not provide detailed operating-voltage limits, pin names, or thermal limits, so those values must be checked against the official manufacturer documentation before release to production.
This page consolidates the verified manufacturer and distributor information, clarifies the controller's core resources, and identifies practical selection considerations. Pricing and stock are intentionally not inferred because exact commercial values were not supplied; compare authorized distributor quotations and the official product page before procurement.
直接替换替代料： AT90USB646-MU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： AT90USB646-MU （相同外形与封装尺寸） ——差异在于 Package, Serial Interfaces.
快速对比工具——选择替代料号进行并排对比：
AT90USB646-16MU
✅ 直接替换📋 参考替代料（不在目录中）
AT90USB646-AU
✅ 直接替换✓ 有现货
$8.1 / 个
查看数据手册 →AT90USB646-AUR
✅ 直接替换📋 参考替代料（不在目录中）
AT90USB646-16MU
✅ 直接替换📋 参考替代料（不在目录中）
AT90USB1286-16MUR
✅ 直接替换📋 参考替代料（不在目录中）
AT90USB646-MU 最大额定值与电气特性
| Product Type | 8-bit AVR RISC-based USB microcontroller |
| 最大时钟频率 | 16 MHz |
| Program Memory | 64 KB flash |
| Program Memory Organization | 64K x 8 bits |
| EEPROM | 2 KB |
| SRAM | 4 KB |
| General-Purpose I/O | 48 lines |
| General-Purpose Working Registers | 32 registers |
| Timer/Counter Resources | 4 flexible timer/counters |
| USB Support | USB 2.0 low-speed and full-speed device |
| Serial Interfaces | USART and byte-oriented two-wire serial interface |
| Real-Time Counter | 1 real-time counter |
| PWM Support | Available through timer/counter compare modes |
| 封装 | 64-QFN, 9 x 9 mm |
| 安装类型 | Surface mount |
| RoHS 状态 | unknown |
AT90USB646-MU 64-qfn, 9 x 9 mm 引脚配置指南
AT90USB646-MU（64-qfn, 9 x 9 mm 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： AT90USB646-MU.
请参阅 数据手册 以查看完整引脚配置。
典型应用
AT90USB646-MU 适用于 7 应用s: USB HID Control Panels, USB Data Loggers, USB Bootloader Devices, USB Serial Adapters, USB-Connected Industrial Sensors, USB Audio or Interface Accessories, USB Connected Test Fixtures.
USB HID Control Panels
AT90USB646-MU fits a USB control panel that needs local button scanning, status indication, and host communication in one device. Its verified 48 I/O lines provide ample external signal capacity, while four flexible timer/counters with compare and PWM support can organize debounce timing, periodic status updates, and indicator behavior. The integrated USB 2.0 low-speed and full-speed device controller avoids a separate USB interface IC when the firmware and host protocol use the AVR platform. The design must still verify the exact HID endpoint requirements, power budget, connector implementation, and pin multiplexing against the official datasheet.
推荐
USB Data Loggers
AT90USB646-MU can act as the control MCU in a compact USB data logger because it combines 64 KB flash for firmware, 4 KB SRAM for runtime buffering, 2 KB EEPROM for calibration or configuration data, and USB low-speed/full-speed device support. Its 48 I/O lines can connect digital sensors, status signals, and storage-control signals, while the timer/counter resources support sampling windows and periodic transfers. The verified data does not specify an ADC or external memory interface, so analog acquisition or large-buffer requirements must be checked before selecting this MCU.
推荐
USB Bootloader Devices
AT90USB646-MU is suitable for a USB-connected embedded product that requires firmware storage and field-update capability. The verified 64 KB ISP flash provides a defined program-memory region, while USB device operation supports a direct host-to-device update path. The 2 KB EEPROM can retain product identity or configuration values, and the 4 KB SRAM can support boot-time buffers and protocol handling. Actual bootloader implementation depends on the official memory map, boot section, programming interface, security features, and USB descriptors, none of which are fully present in the supplied snippets.
推荐
USB Serial Adapters
AT90USB646-MU can implement a USB-to-serial bridge because the verified feature set includes USB low-speed and full-speed device operation plus a dedicated USART. Firmware can translate USB commands into serial traffic while the 48 I/O lines support control signals, status LEDs, or handshake lines. The 64 KB flash and 4 KB SRAM provide room for protocol buffering, while the two-wire interface adds another possible configuration or control path. A production design must confirm voltage levels, baud-rate requirements, ESD protection, connector selection, and whether the target host expects a particular USB class or driver.
推荐
USB-Connected Industrial Sensors
AT90USB646-MU is a reasonable base for a small USB-connected industrial sensor interface when the design uses digital sensing, control outputs, and status reporting. The 48 verified I/O lines can connect multiple discrete inputs and outputs, and the real-time counter plus four flexible timer/counters can support periodic sampling and output timing. USB full-speed device support provides a direct connection to a host, while USART and the two-wire interface can connect local peripherals. Industrial suitability, transient immunity, operating-temperature limits, and isolation must be verified separately because those values are not supplied.
推荐
USB Audio or Interface Accessories
AT90USB646-MU can serve as the USB-facing controller in an accessory that also needs independent timing or serial functions. The verified four timer/counters provide compare and PWM resources for indicators, sampling control, or actuator timing, while USART and the byte-oriented two-wire interface allow peripheral connectivity beyond USB. Its 64 KB flash and 4 KB SRAM are useful for protocol handling and buffering, but the device is not presented here as an audio codec or dedicated digital signal processor. Audio clocking, latency, codec interface, and signal-quality requirements therefore need separate component selection.
推荐
USB Connected Test Fixtures
AT90USB646-MU is suitable for a compact test fixture that enumerates over USB and drives a collection of digital test points. Its 48 I/O lines can connect fixture controls and status inputs, while the timer/counter resources support repeatable timing sequences and PWM-based stimulus where applicable. The two-wire interface and USART provide additional paths for local instrumentation. For production use, verify the fixture's voltage levels, input protection, USB power requirements, calibration storage strategy, and host software compatibility; the supplied verified data does not specify those implementation limits.
推荐
推荐产品汇总
工程参考数据： AT90USB646-MU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | AT90USB646-16MU | AT90USB646-AU | AT90USB646-AUR | AT90USB1286-16MUR |
|---|---|---|---|---|---|
| Package | 64-QFN 9 x 9 mm | 64-QFN 9 x 9 mm - family identity reported; exact package drawing not supplied | 64-QFN 9 x 9 mm - related ordering option | 64-QFN 9 x 9 mm - related ordering option | 64-QFN 9 x 9 mm - functional-equivalent listing |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Unit Price at Quantity 1 | Not provided | Not provided | Not provided | Not provided | Not provided |
关键差异点
- USB integration with AVR control （对比 ATMEGA8U2-MU)
- High I/O availability for compact embedded products （对比 AT90USB646-16MU)
- Integrated connectivity beyond USB （对比 AT90USB1286-16MUR)
设计说明
Use the exact Microchip package drawing for the 64-QFN 9 x 9 mm footprint, including exposed-pad geometry and thermal-via recommendations. USB differential routing should be short, symmetric, continuous over a suitable reference plane, and kept away from switching nodes and high-current return paths. Because the supplied data does not include numerical USB trace dimensions, use the official implementation guidance rather than values inferred from generic QFN examples.
Plan the power rails and decoupling around the official AT90USB646 datasheet before committing the PCB. Place required bypass capacitors at the corresponding supply pins with the shortest practical return path, and verify USB operating-current limits against the complete peripheral load. The verified data confirms the MCU and USB capability but does not provide input-voltage or current limits, so those values must be sourced from the manufacturer documentation.
Do not treat every AT90USB646 ordering suffix as automatically interchangeable. AT90USB646-16MU, AT90USB646-AU, AT90USB646-AUR, and AT90USB646-MU may differ in ordering, grade, or package details that are not visible in the collected snippets. Before substitution, compare the official ordering table, pinout, electrical limits, USB behavior, memory configuration, and package drawing. The present alternatives are provisional because verified web results do not prove complete drop-in equivalence.
Treat exposed-pad thermal management as a PCB-design requirement, not an afterthought. The supplied material confirms a 64-QFN package but gives no junction-temperature, thermal-resistance, or power-dissipation values. Use the official package information and the device's verified operating conditions to estimate worst-case dissipation, then provide copper spreading and vias appropriate to the enclosure and ambient temperature. Do not make thermal claims from unverified generic package assumptions.
合规信息
The supplied verified data does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Verify these claims using the current Microchip product documentation and applicable manufacturer declarations.
