ATMEGA32U4-MU

{
  "slug": "atmega32u4-mu",
  "version": "0.1.0",
  "type": "component",
  "description": "Microchip Tech Microcontrollers (MCU/MPU/SOC), VQFN-44-EP(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "embedded processors & controllers",
    "atmega32u4-mu",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "atmega32u4-mu.kicad_sym",
    "atmega32u4-mu.kicad_mod",
    "atmega32u4-mu.glb",
    "atmega32u4-mu.step",
    "atmega32u4-mu.lbr",
    "docs/hero.png",
    "docs/atmega32u4-mu-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "atmega32u4-mu-hero.glb",
    "atmega32u4-mu-hero.overlay.json"
  ],
  "component": {
    "mpn": "ATMEGA32U4-MU",
    "manufacturer": "Microchip Tech",
    "package": "VQFN-44-EP(7x7)",
    "pin_count": 45,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586182747773263872",
    "parts": {
      "symbol": "atmega32u4-mu.kicad_sym",
      "footprint": "atmega32u4-mu.kicad_mod",
      "model_3d": "atmega32u4-mu-hero.glb",
      "model_3d_plain": "atmega32u4-mu.glb",
      "model_3d_step": "atmega32u4-mu-etched.step",
      "model_3d_step_plain": "atmega32u4-mu.step",
      "lbr": "atmega32u4-mu.lbr"
    },
    "distributor_links": {
      "lcsc": "C112161",
      "digikey": "ATMEGA32U4-MU-ND",
      "mouser": "556-ATMEGA32U4-MU"
    },
    "distributor_check": {
      "checked_at": "2026-10-09T12:39:12Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ATMEGA32U4-MU-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "556-ATMEGA32U4-MU",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PE6",
        "type": "bidirectional",
        "description": "Port E bit 6 bi-directional I/O with internal pull-up; alternate functions INT.6 and AIN0 (analog comparator input)."
      },
      {
        "number": "2",
        "name": "UVCC",
        "type": "power_in",
        "description": "USB pads internal regulator input supply voltage."
      },
      {
        "number": "3",
        "name": "D-",
        "type": "bidirectional",
        "description": "USB full/low speed negative data upstream port; connect to the USB D- connector pin with a serial 22 ohm resistor."
      },
      {
        "number": "4",
        "name": "D+",
        "type": "bidirectional",
        "description": "USB full/low speed positive data upstream port; connect to the USB D+ connector pin with a serial 22 ohm resistor."
      },
      {
        "number": "5",
        "name": "UGND",
        "type": "power_in",
        "description": "USB pads ground."
      },
      {
        "number": "6",
        "name": "UCAP",
        "type": "power_out",
        "description": "USB pads internal regulator output supply voltage; connect to an external 1 uF capacitor."
      },
      {
        "number": "7",
        "name": "VBUS",
        "type": "power_in",
        "description": "USB VBUS monitor input."
      },
      {
        "number": "8",
        "name": "PB0",
        "type": "bidirectional",
        "description": "Port B bit 0 bi-directional I/O with internal pull-up; alternate functions SS and PCINT0."
      },
      {
        "number": "9",
        "name": "PB1",
        "type": "bidirectional",
        "description": "Port B bit 1 bi-directional I/O with internal pull-up; alternate functions SCLK (SPI clock) and PCINT1."
      },
      {
        "number": "10",
        "name": "PB2",
        "type": "bidirectional",
        "description": "Port B bit 2 bi-directional I/O with internal pull-up; alternate functions MOSI, PDI and PCINT2."
      },
      {
        "number": "11",
        "name": "PB3",
        "type": "bidirectional",
        "description": "Port B bit 3 bi-directional I/O with internal pull-up; alternate functions MISO, PDO and PCINT3."
      },
      {
        "number": "12",
        "name": "PB7",
        "type": "bidirectional",
        "description": "Port B bit 7 bi-directional I/O with internal pull-up; alternate functions PCINT7, OC0A, OC1C and RTS."
      },
      {
        "number": "13",
        "name": "RESET",
        "type": "input",
        "description": "Active-low reset input; a low level longer than the minimum pulse length generates a reset even if the clock is not running."
      },
      {
        "number": "14",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage."
      },
      {
        "number": "15",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "16",
        "name": "XTAL2",
        "type": "output",
        "description": "Output from the inverting oscillator amplifier."
      },
      {
        "number": "17",
        "name": "XTAL1",
        "type": "input",
        "description": "Input to the inverting oscillator amplifier and input to the internal clock operating circuit."
      },
      {
        "number": "18",
        "name": "PD0",
        "type": "bidirectional",
        "description": "Port D bit 0 bi-directional I/O with internal pull-up; alternate functions OC0B, SCL and INT0."
      },
      {
        "number": "19",
        "name": "PD1",
        "type": "bidirectional",
        "description": "Port D bit 1 bi-directional I/O with internal pull-up; alternate functions SDA and INT1."
      },
      {
        "number": "20",
        "name": "PD2",
        "type": "bidirectional",
        "description": "Port D bit 2 bi-directional I/O with internal pull-up; alternate functions RXD1 and INT2."
      },
      {
        "number": "21",
        "name": "PD3",
        "type": "bidirectional",
        "description": "Port D bit 3 bi-directional I/O with internal pull-up; alternate functions TXD1 and INT3."
      },
      {
        "number": "22",
        "name": "PD5",
        "type": "bidirectional",
        "description": "Port D bit 5 bi-directional I/O with internal pull-up; alternate functions XCK1 and CTS."
      },
      {
        "number": "23",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "24",
        "name": "AVCC",
        "type": "power_in",
        "description": "Supply voltage for the A/D converter channels; connect to VCC if the ADC is unused, or through a low-pass filter if used."
      },
      {
        "number": "25",
        "name": "PD4",
        "type": "bidirectional",
        "description": "Port D bit 4 bi-directional I/O with internal pull-up; alternate functions ICP1 and ADC8."
      },
      {
        "number": "26",
        "name": "PD6",
        "type": "bidirectional",
        "description": "Port D bit 6 bi-directional I/O with internal pull-up; alternate functions T1, OC4D (inverted) and ADC9."
      },
      {
        "number": "27",
        "name": "PD7",
        "type": "bidirectional",
        "description": "Port D bit 7 bi-directional I/O with internal pull-up; alternate functions T0, OC4D and ADC10."
      },
      {
        "number": "28",
        "name": "PB4",
        "type": "bidirectional",
        "description": "Port B bit 4 bi-directional I/O with internal pull-up; alternate functions PCINT4 and ADC11."
      },
      {
        "number": "29",
        "name": "PB5",
        "type": "bidirectional",
        "description": "Port B bit 5 bi-directional I/O with internal pull-up; alternate functions PCINT5, OC1A and OC4B (inverted), plus an ADC input."
      },
      {
        "number": "30",
        "name": "PB6",
        "type": "bidirectional",
        "description": "Port B bit 6 bi-directional I/O with internal pull-up; alternate functions PCINT6, OC1B and OC4B, plus an ADC input."
      },
      {
        "number": "31",
        "name": "PC6",
        "type": "bidirectional",
        "description": "Port C bit 6 bi-directional I/O with internal pull-up; alternate functions OC3A and OC4A (inverted)."
      },
      {
        "number": "32",
        "name": "PC7",
        "type": "bidirectional",
        "description": "Port C bit 7 bi-directional I/O with internal pull-up; alternate functions ICP3, CLK0 and OC4A."
      },
      {
        "number": "33",
        "name": "PE2",
        "type": "bidirectional",
        "description": "Port E bit 2 bi-directional I/O with internal pull-up; alternate function HWB (active-low)."
      },
      {
        "number": "34",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage."
      },
      {
        "number": "35",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "36",
        "name": "PF7",
        "type": "bidirectional",
        "description": "Port F bit 7 ADC7 analog input or I/O; JTAG TDI, pull-up active when JTAG is enabled even during reset."
      },
      {
        "number": "37",
        "name": "PF6",
        "type": "bidirectional",
        "description": "Port F bit 6 ADC6 analog input or I/O; JTAG TDO."
      },
      {
        "number": "38",
        "name": "PF5",
        "type": "bidirectional",
        "description": "Port F bit 5 ADC5 analog input or I/O; JTAG TMS, pull-up active when JTAG is enabled even during reset."
      },
      {
        "number": "39",
        "name": "PF4",
        "type": "bidirectional",
        "description": "Port F bit 4 ADC4 analog input or I/O; JTAG TCK, pull-up active when JTAG is enabled even during reset."
      },
      {
        "number": "40",
        "name": "PF1",
        "type": "bidirectional",
        "description": "Port F bit 1 ADC1 analog input or I/O."
      },
      {
        "number": "41",
        "name": "PF0",
        "type": "bidirectional",
        "description": "Port F bit 0 ADC0 analog input or I/O."
      },
      {
        "number": "42",
        "name": "AREF",
        "type": "input",
        "description": "Analog reference input for the A/D converter."
      },
      {
        "number": "43",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "44",
        "name": "AVCC",
        "type": "power_in",
        "description": "Supply voltage for the A/D converter channels; connect to VCC if the ADC is unused, or through a low-pass filter if used."
      },
      {
        "number": "45",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-sonnet-5-5",
        "primary_mode": "text+vision",
        "consensus_model": "claude-opus-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The QFN44 drawing (page 19) shows a central exposed pad (D2/E2 5.20 mm nominal), but the datasheet g; The ADC channel numbers for PB5 and PB6 are cut off in the pinout figure (printed as 'ADC...'), so o; Pin types for the I/O pins, UCAP (regulator output) and VBUS are inferred from the descriptions. The",
          "exposed pad 45 added from the footprint",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 27,
        "cost_usd": 0.3797,
        "at": "2026-10-09T12:36:23"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8586182747773263872",
        "pages": 27,
        "sha256": "65cd582b7eceee5f",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 45,
        "described": 45,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "atmega32u4-mu.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.0,
          7.0,
          0.77
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "e095902326bdaee7dcc9926c9d1613852bfa37bad68a82560157ca7fe509925a",
        "checked": "2026-10-09",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "atmega32u4-mu-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          7.0,
          7.0,
          0.77
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "30b3097bb7ec7737fe0597a986359b699e9eaaeb5a8ebf02359763dcb05caa2b",
        "checked": "2026-10-09",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}