ATMEGA16U2-MU

{
  "schema_version": 1,
  "type": "component",
  "slug": "atmega16u2-mu",
  "title": "ATMEGA16U2-MU",
  "brief": "Microchip Tech ATMEL & AVR, QFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "embedded processors & controllers",
    "atmega16u2-mu",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "ATMEGA16U2-MU",
    "manufacturer": "Microchip Tech",
    "package": "QFN-32-EP(5x5)",
    "pin_count": 33,
    "category": "Embedded Processors & Controllers",
    "subcategory": "ATMEL & AVR",
    "datasheet": "https://ww1.microchip.com/downloads/en/DeviceDoc/doc7799.pdf",
    "parts": {
      "symbol": "atmega16u2-mu.kicad_sym",
      "footprint": "atmega16u2-mu.kicad_mod",
      "model_3d": "atmega16u2-mu-hero.glb",
      "model_3d_plain": "atmega16u2-mu-etched.glb",
      "model_3d_step": "atmega16u2-mu-etched.step",
      "model_3d_step_plain": "atmega16u2-mu.step",
      "lbr": "atmega16u2-mu.lbr"
    },
    "distributor_links": {
      "lcsc": "C17317",
      "digikey": "ATMEGA16U2-MU-ND",
      "mouser": "556-ATMEGA16U2-MU"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T00:48:34Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ATMEGA16U2-MU-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "556-ATMEGA16U2-MU",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "XTAL1",
        "type": "input",
        "description": "Input to the inverting oscillator amplifier and input to the internal clock operating circuit."
      },
      {
        "number": "2",
        "name": "XTAL2/PC0",
        "type": "bidirectional",
        "description": "Output from the inverting oscillator amplifier if enabled by fuse, also serves as generic I/O PC0."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "4",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage (2.7 - 5.5V operating range)."
      },
      {
        "number": "5",
        "name": "PC2",
        "type": "bidirectional",
        "description": "Port C bit 2 bi-directional I/O with internal pull-up, alternate function PCINT11 pin change interrupt (also marked AIN2 in the pinout)."
      },
      {
        "number": "6",
        "name": "PD0",
        "type": "bidirectional",
        "description": "Port D bit 0 bi-directional I/O with internal pull-up, alternate functions INT0 external interrupt and OC0B Timer/Counter0 output compare B."
      },
      {
        "number": "7",
        "name": "PD1",
        "type": "bidirectional",
        "description": "Port D bit 1 bi-directional I/O with internal pull-up, alternate functions INT1 external interrupt and AIN0 analog comparator positive input."
      },
      {
        "number": "8",
        "name": "PD2",
        "type": "bidirectional",
        "description": "Port D bit 2 bi-directional I/O with internal pull-up, alternate functions INT2, AIN1 analog comparator negative input and RXD1 USART1 receive data."
      },
      {
        "number": "9",
        "name": "PD3",
        "type": "bidirectional",
        "description": "Port D bit 3 bi-directional I/O with internal pull-up, alternate functions INT3 external interrupt and TXD1 USART1 transmit data."
      },
      {
        "number": "10",
        "name": "PD4",
        "type": "bidirectional",
        "description": "Port D bit 4 bi-directional I/O with internal pull-up, alternate function INT5 external interrupt (also marked AIN3 in the pinout)."
      },
      {
        "number": "11",
        "name": "PD5",
        "type": "bidirectional",
        "description": "Port D bit 5 bi-directional I/O with internal pull-up, alternate functions XCK1 USART1 external clock and PCINT12 pin change interrupt (also marked AIN4 in the pinout)."
      },
      {
        "number": "12",
        "name": "PD6",
        "type": "bidirectional",
        "description": "Port D bit 6 bi-directional I/O with internal pull-up, alternate functions INT6 external interrupt and RTS USART1 receiver flow control (also marked AIN5 in the pinout)."
      },
      {
        "number": "13",
        "name": "PD7",
        "type": "bidirectional",
        "description": "Port D bit 7 bi-directional I/O with internal pull-up, alternate functions HWB hardware boot, T0 Timer/Counter0 clock source, INT7 external interrupt and CTS USART1 transmitter flow control (also marked AIN6 in the pinout)."
      },
      {
        "number": "14",
        "name": "PB0",
        "type": "bidirectional",
        "description": "Port B bit 0 bi-directional I/O with internal pull-up, alternate functions SS SPI slave select input and PCINT0 pin change interrupt."
      },
      {
        "number": "15",
        "name": "PB1",
        "type": "bidirectional",
        "description": "Port B bit 1 bi-directional I/O with internal pull-up, alternate functions SCLK SPI serial clock (also serial programming clock) and PCINT1 pin change interrupt."
      },
      {
        "number": "16",
        "name": "PB2",
        "type": "bidirectional",
        "description": "Port B bit 2 bi-directional I/O with internal pull-up, alternate functions PDI serial programming data input, MOSI SPI data and PCINT2 pin change interrupt."
      },
      {
        "number": "17",
        "name": "PB3",
        "type": "bidirectional",
        "description": "Port B bit 3 bi-directional I/O with internal pull-up, alternate functions PDO serial programming data output, MISO SPI data and PCINT3 pin change interrupt."
      },
      {
        "number": "18",
        "name": "PB4",
        "type": "bidirectional",
        "description": "Port B bit 4 bi-directional I/O with internal pull-up, alternate functions T1 Timer/Counter1 clock source and PCINT4 pin change interrupt."
      },
      {
        "number": "19",
        "name": "PB5",
        "type": "bidirectional",
        "description": "Port B bit 5 bi-directional I/O with internal pull-up, alternate function PCINT5 pin change interrupt."
      },
      {
        "number": "20",
        "name": "PB6",
        "type": "bidirectional",
        "description": "Port B bit 6 bi-directional I/O with internal pull-up, alternate function PCINT6 pin change interrupt."
      },
      {
        "number": "21",
        "name": "PB7",
        "type": "bidirectional",
        "description": "Port B bit 7 bi-directional I/O with internal pull-up, alternate functions OC0A, OC1C output compare outputs and PCINT7 pin change interrupt."
      },
      {
        "number": "22",
        "name": "PC7",
        "type": "bidirectional",
        "description": "Port C bit 7 bi-directional I/O with internal pull-up, alternate functions ICP1 input capture, INT4 external interrupt and CLKO clock output if enabled by fuse."
      },
      {
        "number": "23",
        "name": "PC6",
        "type": "bidirectional",
        "description": "Port C bit 6 bi-directional I/O with internal pull-up, alternate functions OC1A output compare A and PCINT8 pin change interrupt."
      },
      {
        "number": "24",
        "name": "RESET/PC1/dW",
        "type": "bidirectional",
        "description": "Active-low reset input (a low level longer than the minimum pulse length generates a reset), alternatively debugWIRE channel or generic I/O depending on fuses RSTDISBL and DWEN."
      },
      {
        "number": "25",
        "name": "PC5",
        "type": "bidirectional",
        "description": "Port C bit 5 bi-directional I/O with internal pull-up, alternate functions OC1B output compare B and PCINT9 pin change interrupt."
      },
      {
        "number": "26",
        "name": "PC4",
        "type": "bidirectional",
        "description": "Port C bit 4 bi-directional I/O with internal pull-up, alternate function PCINT10 pin change interrupt."
      },
      {
        "number": "27",
        "name": "UCAP",
        "type": "power_out",
        "description": "USB pads internal regulator output supply voltage, to be connected to an external 1 µF capacitor."
      },
      {
        "number": "28",
        "name": "UGND",
        "type": "power_in",
        "description": "USB ground."
      },
      {
        "number": "29",
        "name": "D+",
        "type": "bidirectional",
        "description": "USB full speed positive data upstream port."
      },
      {
        "number": "30",
        "name": "D-",
        "type": "bidirectional",
        "description": "USB full speed negative data upstream port."
      },
      {
        "number": "31",
        "name": "UVCC",
        "type": "power_in",
        "description": "USB pads internal regulator input supply voltage."
      },
      {
        "number": "32",
        "name": "AVCC",
        "type": "power_in",
        "description": "Supply voltage input for all analog features (analog comparator, PLL), to be externally connected to VCC through a low-pass filter."
      },
      {
        "number": "33",
        "name": "EP",
        "type": "power_in",
        "description": "Large center pad underneath the QFN package, to be soldered to ground on the board for good mechanical stability."
      }
    ],
    "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 exposed center pad has no printed pin number. Pin '33' is a conventional number I assigned. The ; The datasheet gives no electrical limits (voltage or current) for individual pins, so descriptions s",
          "vision extraction: provenance cannot be text-verified; needs consensus"
        ],
        "pages_sent": 44,
        "cost_usd": 0.1698,
        "at": "2026-10-28T00:47:56"
      },
      "datasheet": {
        "url": "https://ww1.microchip.com/downloads/en/DeviceDoc/doc7799.pdf",
        "pages": 310,
        "sha256": "182d44b383463202",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "atmega16u2-mu.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5,
          5,
          0.875
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
        "checked": "2026-10-28",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "atmega16u2-mu-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5,
          5,
          0.875
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "3a4978c126303df03f0321c8cba40872e890255333391ece86c4567e708d3bfb",
        "checked": "2026-10-28",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "QFN-32-EP(5x5)",
      "Category": "Embedded Processors & Controllers",
      "Pins": "33"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "atmega16u2-mu"
  ],
  "discovery_pitch": "ATMEGA16U2-MU (Microchip Tech) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "atmega16u2-mu.kicad_sym",
    "atmega16u2-mu.kicad_mod",
    "atmega16u2-mu.glb",
    "atmega16u2-mu.step",
    "atmega16u2-mu.lbr",
    "docs/hero.png",
    "docs/atmega16u2-mu-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "atmega16u2-mu-hero.glb",
    "atmega16u2-mu-hero.overlay.json",
    "atmega16u2-mu-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}