ATMEGA644P-20PU

{
  "schema_version": 1,
  "type": "component",
  "slug": "atmega644p-20pu",
  "title": "ATMEGA644P-20PU",
  "brief": "Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), DIP-40. 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",
    "single chip microcomputer-microcontroller",
    "atmega644p-20pu",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "ATMEGA644P-20PU",
    "manufacturer": "Microchip Tech",
    "package": "DIP-40",
    "pin_count": 40,
    "category": "Single Chip Microcomputer/Microcontroller",
    "subcategory": "Microcontroller Units (MCUs/MPUs/SOCs)",
    "datasheet": "https://ww1.microchip.com/downloads/en/DeviceDoc/doc2593.pdf",
    "parts": {
      "symbol": "atmega644p-20pu.kicad_sym",
      "footprint": "atmega644p-20pu.kicad_mod",
      "model_3d": "atmega644p-20pu-hero.glb",
      "model_3d_plain": "atmega644p-20pu-etched.glb",
      "model_3d_step": "atmega644p-20pu-etched.step",
      "model_3d_step_plain": "atmega644p-20pu.step",
      "lbr": "atmega644p-20pu.lbr"
    },
    "distributor_links": {
      "lcsc": "C5127752",
      "digikey": "ATMEGA644P-20PU-ND",
      "mouser": "556-ATMEGA644P-20PU"
    },
    "distributor_check": {
      "checked_at": "2026-10-29T17:06:02Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ATMEGA644P-20PU-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "556-ATMEGA644P-20PU",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PB0",
        "type": "bidirectional",
        "description": "Port B bit 0, a bi-directional I/O pin with internal pull-up; alternate functions are XCK0, T0 and PCINT8."
      },
      {
        "number": "2",
        "name": "PB1",
        "type": "bidirectional",
        "description": "Port B bit 1, a bi-directional I/O pin with internal pull-up; alternate functions are T1, CLKO (divided system clock output) and PCINT9."
      },
      {
        "number": "3",
        "name": "PB2",
        "type": "bidirectional",
        "description": "Port B bit 2, a bi-directional I/O pin with internal pull-up; alternate functions are AIN0 (analog comparator positive input), INT2 and PCINT10."
      },
      {
        "number": "4",
        "name": "PB3",
        "type": "bidirectional",
        "description": "Port B bit 3, a bi-directional I/O pin with internal pull-up; alternate functions are AIN1 (analog comparator negative input), OC0A and PCINT11."
      },
      {
        "number": "5",
        "name": "PB4",
        "type": "bidirectional",
        "description": "Port B bit 4, a bi-directional I/O pin with internal pull-up; alternate functions are SS (SPI slave select), OC0B and PCINT12."
      },
      {
        "number": "6",
        "name": "PB5",
        "type": "bidirectional",
        "description": "Port B bit 5, a bi-directional I/O pin with internal pull-up; alternate functions are MOSI (SPI master output or slave input) and PCINT13."
      },
      {
        "number": "7",
        "name": "PB6",
        "type": "bidirectional",
        "description": "Port B bit 6, a bi-directional I/O pin with internal pull-up; alternate functions are MISO (SPI master input or slave output) and PCINT14."
      },
      {
        "number": "8",
        "name": "PB7",
        "type": "bidirectional",
        "description": "Port B bit 7, a bi-directional I/O pin with internal pull-up; alternate functions are SCK (SPI clock) and PCINT15."
      },
      {
        "number": "9",
        "name": "RESET",
        "type": "input",
        "description": "Reset input; a low level longer than the minimum pulse length generates a reset, and shorter pulses are not guaranteed to do so."
      },
      {
        "number": "10",
        "name": "VCC",
        "type": "power_in",
        "description": "Digital supply voltage."
      },
      {
        "number": "11",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "12",
        "name": "XTAL2",
        "type": "output",
        "description": "Output from the inverting Oscillator amplifier."
      },
      {
        "number": "13",
        "name": "XTAL1",
        "type": "input",
        "description": "Input to the inverting Oscillator amplifier and to the internal clock operating circuit."
      },
      {
        "number": "14",
        "name": "PD0",
        "type": "bidirectional",
        "description": "Port D bit 0, a bi-directional I/O pin with internal pull-up; alternate functions are RXD0 and PCINT24."
      },
      {
        "number": "15",
        "name": "PD1",
        "type": "bidirectional",
        "description": "Port D bit 1, a bi-directional I/O pin with internal pull-up; alternate functions are TXD0 and PCINT25."
      },
      {
        "number": "16",
        "name": "PD2",
        "type": "bidirectional",
        "description": "Port D bit 2, a bi-directional I/O pin with internal pull-up; alternate functions are INT0 and PCINT26."
      },
      {
        "number": "17",
        "name": "PD3",
        "type": "bidirectional",
        "description": "Port D bit 3, a bi-directional I/O pin with internal pull-up; alternate functions are INT1 and PCINT27."
      },
      {
        "number": "18",
        "name": "PD4",
        "type": "bidirectional",
        "description": "Port D bit 4, a bi-directional I/O pin with internal pull-up; alternate functions are OC1B and PCINT28."
      },
      {
        "number": "19",
        "name": "PD5",
        "type": "bidirectional",
        "description": "Port D bit 5, a bi-directional I/O pin with internal pull-up; alternate functions are OC1A and PCINT29."
      },
      {
        "number": "20",
        "name": "PD6",
        "type": "bidirectional",
        "description": "Port D bit 6, a bi-directional I/O pin with internal pull-up; alternate functions are OC2B, ICP and PCINT30."
      },
      {
        "number": "21",
        "name": "PD7",
        "type": "bidirectional",
        "description": "Port D bit 7, a bi-directional I/O pin with internal pull-up; alternate functions are OC2A and PCINT31."
      },
      {
        "number": "22",
        "name": "PC0",
        "type": "bidirectional",
        "description": "Port C bit 0, a bi-directional I/O pin with internal pull-up; alternate functions are SCL (two-wire serial clock) and PCINT16."
      },
      {
        "number": "23",
        "name": "PC1",
        "type": "bidirectional",
        "description": "Port C bit 1, a bi-directional I/O pin with internal pull-up; alternate functions are SDA (two-wire serial data) and PCINT17."
      },
      {
        "number": "24",
        "name": "PC2",
        "type": "bidirectional",
        "description": "Port C bit 2, a bi-directional I/O pin with internal pull-up; alternate functions are TCK (JTAG) and PCINT18."
      },
      {
        "number": "25",
        "name": "PC3",
        "type": "bidirectional",
        "description": "Port C bit 3, a bi-directional I/O pin with internal pull-up; alternate functions are TMS (JTAG) and PCINT19."
      },
      {
        "number": "26",
        "name": "PC4",
        "type": "bidirectional",
        "description": "Port C bit 4, a bi-directional I/O pin with internal pull-up; alternate functions are TDO (JTAG) and PCINT20."
      },
      {
        "number": "27",
        "name": "PC5",
        "type": "bidirectional",
        "description": "Port C bit 5, a bi-directional I/O pin with internal pull-up; alternate functions are TDI (JTAG) and PCINT21."
      },
      {
        "number": "28",
        "name": "PC6",
        "type": "bidirectional",
        "description": "Port C bit 6, a bi-directional I/O pin with internal pull-up; alternate functions are TOSC1 (Timer/Counter2 oscillator) and PCINT22."
      },
      {
        "number": "29",
        "name": "PC7",
        "type": "bidirectional",
        "description": "Port C bit 7, a bi-directional I/O pin with internal pull-up; alternate functions are TOSC2 (Timer/Counter2 oscillator) and PCINT23."
      },
      {
        "number": "30",
        "name": "AVCC",
        "type": "power_in",
        "description": "Analog supply pin, shown in the pinout; the extracted text gives no further description."
      },
      {
        "number": "31",
        "name": "GND",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "32",
        "name": "AREF",
        "type": "input",
        "description": "Analog reference pin for the A/D converter, shown in the pinout; the extracted text gives no further description."
      },
      {
        "number": "33",
        "name": "PA7",
        "type": "bidirectional",
        "description": "Port A bit 7, serving as an ADC analog input and a bi-directional I/O pin with internal pull-up; alternate function is PCINT7."
      },
      {
        "number": "34",
        "name": "PA6",
        "type": "bidirectional",
        "description": "Port A bit 6, serving as an ADC analog input and a bi-directional I/O pin with internal pull-up; alternate function is PCINT6."
      },
      {
        "number": "35",
        "name": "PA5",
        "type": "bidirectional",
        "description": "Port A bit 5, serving as an ADC analog input and a bi-directional I/O pin with internal pull-up; alternate function is PCINT5."
      },
      {
        "number": "36",
        "name": "PA4",
        "type": "bidirectional",
        "description": "Port A bit 4, serving as an ADC analog input and a bi-directional I/O pin with internal pull-up; alternate function is PCINT4."
      },
      {
        "number": "37",
        "name": "PA3",
        "type": "bidirectional",
        "description": "Port A bit 3, serving as an ADC analog input and a bi-directional I/O pin with internal pull-up; alternate function is PCINT3."
      },
      {
        "number": "38",
        "name": "PA2",
        "type": "bidirectional",
        "description": "Port A bit 2, serving as an ADC analog input and a bi-directional I/O pin with internal pull-up; alternate function is PCINT2."
      },
      {
        "number": "39",
        "name": "PA1",
        "type": "bidirectional",
        "description": "Port A bit 1, serving as an ADC analog input and a bi-directional I/O pin with internal pull-up; alternate function is PCINT1."
      },
      {
        "number": "40",
        "name": "PA0",
        "type": "bidirectional",
        "description": "Port A bit 0, serving as an ADC analog input and a bi-directional I/O pin with internal pull-up; alternate function is PCINT0."
      }
    ],
    "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 DIP-40 (40P6 PDIP) pin numbers are not printed in the extracted text. They follow the standard P; The extracted text gives no description for AVCC or AREF, so their descriptions are limited to what ; The DIP-40 package is the 40P6 PDIP outline on page 363, matching the package hint.",
          "26/40 pins cited to the wrong page (name found elsewhere): ['6:PB5@p2', '7:PB6@p2', '12:XTAL2@p5', '13:XTAL1@p5']"
        ],
        "pages_sent": 52,
        "cost_usd": 0.0758,
        "at": "2026-10-29T17:05:50"
      },
      "datasheet": {
        "url": "https://ww1.microchip.com/downloads/en/DeviceDoc/doc2593.pdf",
        "pages": 376,
        "sha256": "198bacc71bec3b55",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 40,
        "described": 40,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "atmega644p-20pu.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          25.4,
          50.8,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0.127,
        "footprint_binding": "identity",
        "sha256": "114010029e96b840de5e76a4e7f09f46a19e6db723f6d096bd70dbeb8ce0aff9",
        "checked": "2026-10-29",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "atmega644p-20pu-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "body on z = 0, through-hole leads below",
        "extents_mm": [
          25.4,
          50.8,
          6.98
        ],
        "zmin_mm": -3.3,
        "centre_offset_mm": 0.127,
        "footprint_binding": "identity",
        "sha256": "8f34e77a87b422ee68fcf759d657c734d92b7b098d5287bf64424ea1079ddee3",
        "checked": "2026-10-29",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "DIP-40",
      "Category": "Single Chip Microcomputer/Microcontroller",
      "Pins": "40"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "atmega644p-20pu"
  ],
  "discovery_pitch": "ATMEGA644P-20PU (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": [
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    "README.md",
    "atmega644p-20pu.kicad_sym",
    "atmega644p-20pu.kicad_mod",
    "atmega644p-20pu.glb",
    "atmega644p-20pu.step",
    "atmega644p-20pu.lbr",
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    "docs/atmega644p-20pu-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "atmega644p-20pu-hero.glb",
    "atmega644p-20pu-hero.overlay.json",
    "atmega644p-20pu-etched.glb"
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  "visibility": {
    "public": true
  }
}