AT90USB646-MU

{
  "slug": "at90usb646-mu",
  "version": "0.1.0",
  "type": "component",
  "description": "Microchip Tech Pre-ordered MCUs, QFN-64-EP(9x9). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "embedded processors & controllers",
    "at90usb646-mu",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "at90usb646-mu.kicad_sym",
    "at90usb646-mu.kicad_mod",
    "at90usb646-mu.glb",
    "at90usb646-mu.step",
    "at90usb646-mu.lbr",
    "docs/hero.png",
    "docs/at90usb646-mu-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "at90usb646-mu-hero.glb",
    "at90usb646-mu-hero.overlay.json",
    "at90usb646-mu-etched.glb"
  ],
  "component": {
    "mpn": "AT90USB646-MU",
    "manufacturer": "Microchip Tech",
    "package": "QFN-64-EP(9x9)",
    "pin_count": 65,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Pre-ordered MCUs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/943b60649c88592d50bf50d9bed7bf64.pdf",
    "parts": {
      "symbol": "at90usb646-mu.kicad_sym",
      "footprint": "at90usb646-mu.kicad_mod",
      "model_3d": "at90usb646-mu-hero.glb",
      "model_3d_plain": "at90usb646-mu-etched.glb",
      "model_3d_step": "at90usb646-mu-etched.step",
      "model_3d_step_plain": "at90usb646-mu.step",
      "lbr": "at90usb646-mu.lbr"
    },
    "distributor_links": {
      "lcsc": "C1338078",
      "digikey": "AT90USB646-MU-ND",
      "mouser": "556-AT90USB646-MU"
    },
    "distributor_check": {
      "checked_at": "2026-10-30T21:48:35Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "AT90USB646-MU-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "556-AT90USB646-MU",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PE6",
        "type": "bidirectional",
        "description": "Port E bit 6, 8-bit bidirectional I/O with internal pull-up, alternate functions INT.6 and AIN.0."
      },
      {
        "number": "2",
        "name": "PE7",
        "type": "bidirectional",
        "description": "Port E bit 7, bidirectional I/O with internal pull-up, alternate functions INT.7, AIN.1 and UVcon."
      },
      {
        "number": "3",
        "name": "UVCC",
        "type": "power_in",
        "description": "USB pads internal regulator input supply voltage."
      },
      {
        "number": "4",
        "name": "D-",
        "type": "bidirectional",
        "description": "USB full/low speed negative data line, to be connected to the USB D- connector pin through a serial 22 ohm resistor."
      },
      {
        "number": "5",
        "name": "D+",
        "type": "bidirectional",
        "description": "USB full/low speed positive data line, to be connected to the USB D+ connector pin through a serial 22 ohm resistor."
      },
      {
        "number": "6",
        "name": "UGND",
        "type": "power_in",
        "description": "USB pads ground."
      },
      {
        "number": "7",
        "name": "UCAP",
        "type": "power_out",
        "description": "USB pads internal regulator output supply voltage, to be connected to an external 1 uF capacitor."
      },
      {
        "number": "8",
        "name": "VBUS",
        "type": "power_in",
        "description": "USB VBUS monitor and OTG negotiations."
      },
      {
        "number": "9",
        "name": "PE3",
        "type": "bidirectional",
        "description": "Port E bit 3, bidirectional I/O with internal pull-up, alternate function IUID."
      },
      {
        "number": "10",
        "name": "PB0",
        "type": "bidirectional",
        "description": "Port B bit 0, bidirectional I/O with internal pull-up, alternate functions SS and PCINT0."
      },
      {
        "number": "11",
        "name": "PB1",
        "type": "bidirectional",
        "description": "Port B bit 1, bidirectional I/O with internal pull-up, alternate functions PCINT1 and SCLK."
      },
      {
        "number": "12",
        "name": "PB2",
        "type": "bidirectional",
        "description": "Port B bit 2, bidirectional I/O with internal pull-up, alternate functions PDI, PCINT2 and MOSI."
      },
      {
        "number": "13",
        "name": "PB3",
        "type": "bidirectional",
        "description": "Port B bit 3, bidirectional I/O with internal pull-up, alternate functions PDO, PCINT3 and MISO."
      },
      {
        "number": "14",
        "name": "PB4",
        "type": "bidirectional",
        "description": "Port B bit 4, bidirectional I/O with internal pull-up, alternate functions PCINT4 and OC.2A."
      },
      {
        "number": "15",
        "name": "PB5",
        "type": "bidirectional",
        "description": "Port B bit 5, bidirectional I/O with internal pull-up, alternate functions PCINT5 and OC.1A."
      },
      {
        "number": "16",
        "name": "PB6",
        "type": "bidirectional",
        "description": "Port B bit 6, bidirectional I/O with internal pull-up, alternate functions PCINT6 and OC.1B."
      },
      {
        "number": "17",
        "name": "PB7",
        "type": "bidirectional",
        "description": "Port B bit 7, bidirectional I/O with internal pull-up, alternate functions PCINT7, OC.0A and OC.1C."
      },
      {
        "number": "18",
        "name": "PE4",
        "type": "bidirectional",
        "description": "Port E bit 4, bidirectional I/O with internal pull-up, alternate functions INT4 and TOSC1."
      },
      {
        "number": "19",
        "name": "PE5",
        "type": "bidirectional",
        "description": "Port E bit 5, bidirectional I/O with internal pull-up, alternate functions INT.5 and TOSC2."
      },
      {
        "number": "20",
        "name": "RESET",
        "type": "input",
        "description": "Reset input; a low level longer than the minimum pulse length generates a reset even if the clock is not running."
      },
      {
        "number": "21",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage."
      },
      {
        "number": "22",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "23",
        "name": "XTAL2",
        "type": "output",
        "description": "Output from the inverting oscillator amplifier."
      },
      {
        "number": "24",
        "name": "XTAL1",
        "type": "input",
        "description": "Input to the inverting oscillator amplifier and input to the internal clock operating circuit."
      },
      {
        "number": "25",
        "name": "PD0",
        "type": "bidirectional",
        "description": "Port D bit 0, bidirectional I/O with internal pull-up, alternate functions OC0B, SCL and INT0."
      },
      {
        "number": "26",
        "name": "PD1",
        "type": "bidirectional",
        "description": "Port D bit 1, bidirectional I/O with internal pull-up, alternate functions OC2B, SDA and INT1."
      },
      {
        "number": "27",
        "name": "PD2",
        "type": "bidirectional",
        "description": "Port D bit 2, bidirectional I/O with internal pull-up, alternate functions RXD1 and INT2."
      },
      {
        "number": "28",
        "name": "PD3",
        "type": "bidirectional",
        "description": "Port D bit 3, bidirectional I/O with internal pull-up, alternate functions TXD1 and INT3."
      },
      {
        "number": "29",
        "name": "PD4",
        "type": "bidirectional",
        "description": "Port D bit 4, bidirectional I/O with internal pull-up, alternate function ICP1."
      },
      {
        "number": "30",
        "name": "PD5",
        "type": "bidirectional",
        "description": "Port D bit 5, bidirectional I/O with internal pull-up, alternate function XCK1."
      },
      {
        "number": "31",
        "name": "PD6",
        "type": "bidirectional",
        "description": "Port D bit 6, bidirectional I/O with internal pull-up, alternate function T1."
      },
      {
        "number": "32",
        "name": "PD7",
        "type": "bidirectional",
        "description": "Port D bit 7, bidirectional I/O with internal pull-up, alternate function T0."
      },
      {
        "number": "33",
        "name": "PE0",
        "type": "bidirectional",
        "description": "Port E bit 0, bidirectional I/O with internal pull-up, alternate function WR."
      },
      {
        "number": "34",
        "name": "PE1",
        "type": "bidirectional",
        "description": "Port E bit 1, bidirectional I/O with internal pull-up, alternate function RD."
      },
      {
        "number": "35",
        "name": "PC0",
        "type": "bidirectional",
        "description": "Port C bit 0, bidirectional I/O with internal pull-up, alternate function A8."
      },
      {
        "number": "36",
        "name": "PC1",
        "type": "bidirectional",
        "description": "Port C bit 1, bidirectional I/O with internal pull-up, alternate function A9."
      },
      {
        "number": "37",
        "name": "PC2",
        "type": "bidirectional",
        "description": "Port C bit 2, bidirectional I/O with internal pull-up, alternate function A10."
      },
      {
        "number": "38",
        "name": "PC3",
        "type": "bidirectional",
        "description": "Port C bit 3, bidirectional I/O with internal pull-up, alternate functions A11 and T.3."
      },
      {
        "number": "39",
        "name": "PC4",
        "type": "bidirectional",
        "description": "Port C bit 4, bidirectional I/O with internal pull-up, alternate functions A12 and OC.3C."
      },
      {
        "number": "40",
        "name": "PC5",
        "type": "bidirectional",
        "description": "Port C bit 5, bidirectional I/O with internal pull-up, alternate functions A13 and OC.3B."
      },
      {
        "number": "41",
        "name": "PC6",
        "type": "bidirectional",
        "description": "Port C bit 6, bidirectional I/O with internal pull-up, alternate functions A14 and OC.3A."
      },
      {
        "number": "42",
        "name": "PC7",
        "type": "bidirectional",
        "description": "Port C bit 7, bidirectional I/O with internal pull-up, alternate functions A15, IC.3 and CLKO."
      },
      {
        "number": "43",
        "name": "PE2",
        "type": "bidirectional",
        "description": "Port E bit 2, bidirectional I/O with internal pull-up, alternate functions ALE and HWB."
      },
      {
        "number": "44",
        "name": "PA7",
        "type": "bidirectional",
        "description": "Port A bit 7, bidirectional I/O with internal pull-up, alternate function AD7."
      },
      {
        "number": "45",
        "name": "PA6",
        "type": "bidirectional",
        "description": "Port A bit 6, bidirectional I/O with internal pull-up, alternate function AD6."
      },
      {
        "number": "46",
        "name": "PA5",
        "type": "bidirectional",
        "description": "Port A bit 5, bidirectional I/O with internal pull-up, alternate function AD5."
      },
      {
        "number": "47",
        "name": "PA4",
        "type": "bidirectional",
        "description": "Port A bit 4, bidirectional I/O with internal pull-up, alternate function AD4."
      },
      {
        "number": "48",
        "name": "PA3",
        "type": "bidirectional",
        "description": "Port A bit 3, bidirectional I/O with internal pull-up, alternate function AD3."
      },
      {
        "number": "49",
        "name": "PA2",
        "type": "bidirectional",
        "description": "Port A bit 2, bidirectional I/O with internal pull-up, alternate function AD2."
      },
      {
        "number": "50",
        "name": "PA1",
        "type": "bidirectional",
        "description": "Port A bit 1, bidirectional I/O with internal pull-up, alternate function AD1."
      },
      {
        "number": "51",
        "name": "PA0",
        "type": "bidirectional",
        "description": "Port A bit 0, bidirectional I/O with internal pull-up, alternate function AD0."
      },
      {
        "number": "52",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage."
      },
      {
        "number": "53",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "54",
        "name": "PF7",
        "type": "bidirectional",
        "description": "Port F bit 7, ADC input ADC7 or I/O, JTAG TDI; pull-up is activated even on reset if JTAG is enabled."
      },
      {
        "number": "55",
        "name": "PF6",
        "type": "bidirectional",
        "description": "Port F bit 6, ADC input ADC6 or I/O, JTAG TDO."
      },
      {
        "number": "56",
        "name": "PF5",
        "type": "bidirectional",
        "description": "Port F bit 5, ADC input ADC5 or I/O, JTAG TMS; pull-up is activated even on reset if JTAG is enabled."
      },
      {
        "number": "57",
        "name": "PF4",
        "type": "bidirectional",
        "description": "Port F bit 4, ADC input ADC4 or I/O, JTAG TCK; pull-up is activated even on reset if JTAG is enabled."
      },
      {
        "number": "58",
        "name": "PF3",
        "type": "bidirectional",
        "description": "Port F bit 3, ADC input ADC3 or I/O when the ADC is not used."
      },
      {
        "number": "59",
        "name": "PF2",
        "type": "bidirectional",
        "description": "Port F bit 2, ADC input ADC2 or I/O when the ADC is not used."
      },
      {
        "number": "60",
        "name": "PF1",
        "type": "bidirectional",
        "description": "Port F bit 1, ADC input ADC1 or I/O when the ADC is not used."
      },
      {
        "number": "61",
        "name": "PF0",
        "type": "bidirectional",
        "description": "Port F bit 0, ADC input ADC0 or I/O when the ADC is not used."
      },
      {
        "number": "62",
        "name": "AREF",
        "type": "input",
        "description": "Analog reference pin for the A/D converter."
      },
      {
        "number": "63",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "64",
        "name": "AVCC",
        "type": "power_in",
        "description": "Analog supply voltage."
      },
      {
        "number": "65",
        "name": "EP",
        "type": "power_in",
        "description": "Large center pad internally connected to GND; should be soldered or glued to the board for mechanical stability."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The QFN pin numbers were not printed as text in the extracted figure; they were inferred from the or; The 9x9 QFN has a large exposed center pad that is metal and internally connected to GND (page 4). I; The datasheet ordering table (page 18) lists AT90USB646-MU alongside the 64-lead 9x9 QFN code, which",
          "exposed pad 65 added from the footprint",
          "47/65 pins cited to the wrong page (name found elsewhere): ['5:PF1@p9', '6:PF2@p9', '7:PF3@p9', '10:PF6@p9']"
        ],
        "pages_sent": 39,
        "cost_usd": 0.1153,
        "at": "2026-10-30T21:48:20"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/943b60649c88592d50bf50d9bed7bf64.pdf",
        "pages": 39,
        "sha256": "1134cff1fb835efc",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 65,
        "described": 65,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "at90usb646-mu.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9.0,
          9.0,
          0.75
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "dce07a86ec3fe3ca87eebdff13827f55e036ced5518fee01f85cec4a3f56366d",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "at90usb646-mu-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9.0,
          9.0,
          0.75
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "6fd6c826f87076beaf285eb8140b2c2784bc5a4d30f3bd50b6e69203a2fcb626",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "PS",
      "source_page": 18,
      "e": {
        "nom_mm": 0.5,
        "range_mm": [
          null,
          null
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "at90usb646-mu.step",
        "verdict": "SKIP",
        "reasons": [
          "the datasheet dimensions give no height or body size to compare"
        ],
        "by": "factory/package_fit.py"
      }
    }
  }
}