ATSAM3U4EA-AU

{
  "slug": "atsam3u4ea-au",
  "version": "0.1.0",
  "type": "component",
  "description": "Microchip Tech Microcontroller Units (MCUs/MPUs/SOCs), LQFP-144(20x20). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
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    "single chip microcomputer-microcontroller",
    "atsam3u4ea-au",
    "factory-2.0.0",
    "extractor-text"
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  "dependencies": {},
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  "component": {
    "mpn": "ATSAM3U4EA-AU",
    "manufacturer": "Microchip Tech",
    "package": "LQFP-144(20x20)",
    "pin_count": 144,
    "category": "Single Chip Microcomputer/Microcontroller",
    "subcategory": "Microcontroller Units (MCUs/MPUs/SOCs)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/a5a6641ed9f7c973a21ba0c342b7d4e4.pdf",
    "parts": {
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      "lbr": "atsam3u4ea-au.lbr"
    },
    "distributor_links": {
      "lcsc": "C916225",
      "digikey": "ATSAM3U4EA-AU-ND",
      "mouser": "556-ATSAM3U4EA-AU"
    },
    "distributor_check": {
      "checked_at": "2026-10-30T21:58:33Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "ATSAM3U4EA-AU-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "556-ATSAM3U4EA-AU",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "TDI",
        "type": "input",
        "description": "JTAG test data input, used in JTAG debug and boundary-scan operation."
      },
      {
        "number": "2",
        "name": "VDDOUT",
        "type": "power_out",
        "description": "Output of the on-chip voltage regulator."
      },
      {
        "number": "3",
        "name": "VDDIN",
        "type": "power_in",
        "description": "Powers the voltage regulator."
      },
      {
        "number": "4",
        "name": "TDO/TRACESWO",
        "type": "output",
        "description": "JTAG test data output, shared with asynchronous trace output TRACESWO in SWD mode; the pin is in input mode outside debug, so an external 100 kΩ pull-up is required to avoid floating-input current."
      },
      {
        "number": "5",
        "name": "PB31",
        "type": "bidirectional",
        "description": "PIO Controller B line 31; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "6",
        "name": "PB30",
        "type": "bidirectional",
        "description": "PIO Controller B line 30; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "7",
        "name": "TMS/SWDIO",
        "type": "bidirectional",
        "description": "JTAG test mode select, or serial wire data input/output in SWD mode."
      },
      {
        "number": "8",
        "name": "PB29",
        "type": "bidirectional",
        "description": "PIO Controller B line 29; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "9",
        "name": "TCK/SWCLK",
        "type": "input",
        "description": "JTAG test clock, or serial wire clock in SWD mode."
      },
      {
        "number": "10",
        "name": "PB28",
        "type": "bidirectional",
        "description": "PIO Controller B line 28; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "11",
        "name": "NRST",
        "type": "bidirectional",
        "description": "Microcontroller reset, active low, configured as input/output."
      },
      {
        "number": "12",
        "name": "PB27",
        "type": "bidirectional",
        "description": "PIO Controller B line 27; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "13",
        "name": "PB26",
        "type": "bidirectional",
        "description": "PIO Controller B line 26; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "14",
        "name": "PB25",
        "type": "bidirectional",
        "description": "PIO Controller B line 25; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "15",
        "name": "PB24",
        "type": "bidirectional",
        "description": "PIO Controller B line 24; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "16",
        "name": "VDDCORE",
        "type": "power_in",
        "description": "Powers the core, embedded memories and peripherals; voltage range 1.62-1.95 V."
      },
      {
        "number": "17",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Powers the peripheral I/O lines; voltage range 1.62-3.6 V."
      },
      {
        "number": "18",
        "name": "GND",
        "type": "power_in",
        "description": "Ground common to the VDDCORE and VDDIO supplies."
      },
      {
        "number": "19",
        "name": "PB23",
        "type": "bidirectional",
        "description": "PIO Controller B line 23; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "20",
        "name": "PB22",
        "type": "bidirectional",
        "description": "PIO Controller B line 22; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "21",
        "name": "PB21",
        "type": "bidirectional",
        "description": "PIO Controller B line 21; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "22",
        "name": "PC21",
        "type": "bidirectional",
        "description": "PIO Controller C line 21; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "23",
        "name": "PB20",
        "type": "bidirectional",
        "description": "PIO Controller B line 20; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "24",
        "name": "PB19",
        "type": "bidirectional",
        "description": "PIO Controller B line 19; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "25",
        "name": "PB18",
        "type": "bidirectional",
        "description": "PIO Controller B line 18; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "26",
        "name": "PB17",
        "type": "bidirectional",
        "description": "PIO Controller B line 17; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "27",
        "name": "VDDCORE",
        "type": "power_in",
        "description": "Powers the core, embedded memories and peripherals; voltage range 1.62-1.95 V."
      },
      {
        "number": "28",
        "name": "PC14",
        "type": "bidirectional",
        "description": "PIO Controller C line 14; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "29",
        "name": "PB14",
        "type": "bidirectional",
        "description": "PIO Controller B line 14; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "30",
        "name": "PB10",
        "type": "bidirectional",
        "description": "PIO Controller B line 10; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "31",
        "name": "PB9",
        "type": "bidirectional",
        "description": "PIO Controller B line 9; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "32",
        "name": "PC19",
        "type": "bidirectional",
        "description": "PIO Controller C line 19; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "33",
        "name": "GNDPLL",
        "type": "power_in",
        "description": "Separate ground for VDDPLL, which powers PLL A, UPLL and the 3-20 MHz oscillator."
      },
      {
        "number": "34",
        "name": "VDDPLL",
        "type": "power_in",
        "description": "Powers PLL A, UPLL and the 3-20 MHz oscillator; voltage range 1.62-1.95 V."
      },
      {
        "number": "35",
        "name": "XOUT",
        "type": "output",
        "description": "Output of the 3-20 MHz crystal oscillator."
      },
      {
        "number": "36",
        "name": "XIN",
        "type": "input",
        "description": "Input of the 3-20 MHz crystal oscillator, powered by VDDPLL."
      },
      {
        "number": "37",
        "name": "DHSDP",
        "type": "bidirectional",
        "description": "Positive data line of the High Speed USB Device Port, which has an embedded transceiver."
      },
      {
        "number": "38",
        "name": "DHSDM",
        "type": "bidirectional",
        "description": "Negative data line of the High Speed USB Device Port, which has an embedded transceiver."
      },
      {
        "number": "39",
        "name": "VBG",
        "type": "passive",
        "description": "Bandgap voltage node listed in the pinout; the provided text gives no electrical description for this pin."
      },
      {
        "number": "40",
        "name": "VDDUTMI",
        "type": "power_in",
        "description": "Powers the UTMI+ interface; voltage range 3.0-3.6 V, 3.3 V nominal."
      },
      {
        "number": "41",
        "name": "DFSDM",
        "type": "bidirectional",
        "description": "USB data line (negative) listed in the pinout; the provided text gives no electrical description for this pin."
      },
      {
        "number": "42",
        "name": "DFSDP",
        "type": "bidirectional",
        "description": "USB data line (positive) listed in the pinout; the provided text gives no electrical description for this pin."
      },
      {
        "number": "43",
        "name": "GNDUTMI",
        "type": "power_in",
        "description": "Separate ground for VDDUTMI, which powers the UTMI+ interface."
      },
      {
        "number": "44",
        "name": "VDDCORE",
        "type": "power_in",
        "description": "Powers the core, embedded memories and peripherals; voltage range 1.62-1.95 V."
      },
      {
        "number": "45",
        "name": "PA28",
        "type": "bidirectional",
        "description": "PIO Controller A line 28; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "46",
        "name": "PA29",
        "type": "bidirectional",
        "description": "PIO Controller A line 29; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "47",
        "name": "PC22",
        "type": "bidirectional",
        "description": "PIO Controller C line 22; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "48",
        "name": "PA31",
        "type": "bidirectional",
        "description": "PIO Controller A line 31; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "49",
        "name": "PC23",
        "type": "bidirectional",
        "description": "PIO Controller C line 23; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "50",
        "name": "VDDCORE",
        "type": "power_in",
        "description": "Powers the core, embedded memories and peripherals; voltage range 1.62-1.95 V."
      },
      {
        "number": "51",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Powers the peripheral I/O lines; voltage range 1.62-3.6 V."
      },
      {
        "number": "52",
        "name": "GND",
        "type": "power_in",
        "description": "Ground common to the VDDCORE and VDDIO supplies."
      },
      {
        "number": "53",
        "name": "PB0",
        "type": "bidirectional",
        "description": "PIO Controller B line 0; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "54",
        "name": "PC24",
        "type": "bidirectional",
        "description": "PIO Controller C line 24; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "55",
        "name": "PB1",
        "type": "bidirectional",
        "description": "PIO Controller B line 1; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "56",
        "name": "PC25",
        "type": "bidirectional",
        "description": "PIO Controller C line 25; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "57",
        "name": "PB2",
        "type": "bidirectional",
        "description": "PIO Controller B line 2; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "58",
        "name": "PC26",
        "type": "bidirectional",
        "description": "PIO Controller C line 26; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "59",
        "name": "PB11",
        "type": "bidirectional",
        "description": "PIO Controller B line 11; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "60",
        "name": "GND",
        "type": "power_in",
        "description": "Ground common to the VDDCORE and VDDIO supplies."
      },
      {
        "number": "61",
        "name": "PB12",
        "type": "bidirectional",
        "description": "PIO Controller B line 12; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "62",
        "name": "PB13",
        "type": "bidirectional",
        "description": "PIO Controller B line 13; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "63",
        "name": "PC27",
        "type": "bidirectional",
        "description": "PIO Controller C line 27; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "64",
        "name": "PA27",
        "type": "bidirectional",
        "description": "PIO Controller A line 27; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "65",
        "name": "PB5",
        "type": "bidirectional",
        "description": "PIO Controller B line 5; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "66",
        "name": "PB6",
        "type": "bidirectional",
        "description": "PIO Controller B line 6; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "67",
        "name": "PB7",
        "type": "bidirectional",
        "description": "PIO Controller B line 7; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "68",
        "name": "PB8",
        "type": "bidirectional",
        "description": "PIO Controller B line 8; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "69",
        "name": "PC28",
        "type": "bidirectional",
        "description": "PIO Controller C line 28; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "70",
        "name": "PC29",
        "type": "bidirectional",
        "description": "PIO Controller C line 29; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "71",
        "name": "PC30",
        "type": "bidirectional",
        "description": "PIO Controller C line 30; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "72",
        "name": "PC31",
        "type": "bidirectional",
        "description": "PIO Controller C line 31; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "73",
        "name": "VDDANA",
        "type": "power_in",
        "description": "Powers the ADC cells; voltage range 2.0-3.6 V."
      },
      {
        "number": "74",
        "name": "ADVREF",
        "type": "input",
        "description": "Reference voltage for the 10-bit ADC; conversions extend from 0 V to ADVREF."
      },
      {
        "number": "75",
        "name": "GNDANA",
        "type": "power_in",
        "description": "Separate ground for VDDANA, which powers the ADC cells."
      },
      {
        "number": "76",
        "name": "AD12BVREF",
        "type": "input",
        "description": "Reference voltage for the 12-bit ADC; conversions extend from 0 V to AD12BVREF."
      },
      {
        "number": "77",
        "name": "PA22/PGMD14",
        "type": "bidirectional",
        "description": "PIO Controller A line 22, with alternate parallel-programming function PGMD14 (see Section 21, FFPI)."
      },
      {
        "number": "78",
        "name": "PA30",
        "type": "bidirectional",
        "description": "PIO Controller A line 30; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "79",
        "name": "PB3",
        "type": "bidirectional",
        "description": "PIO Controller B line 3; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "80",
        "name": "PB4",
        "type": "bidirectional",
        "description": "PIO Controller B line 4; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "81",
        "name": "PC15",
        "type": "bidirectional",
        "description": "PIO Controller C line 15; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "82",
        "name": "PC16",
        "type": "bidirectional",
        "description": "PIO Controller C line 16; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "83",
        "name": "PC17",
        "type": "bidirectional",
        "description": "PIO Controller C line 17; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "84",
        "name": "PC18",
        "type": "bidirectional",
        "description": "PIO Controller C line 18; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "85",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Powers the peripheral I/O lines; voltage range 1.62-3.6 V."
      },
      {
        "number": "86",
        "name": "VDDCORE",
        "type": "power_in",
        "description": "Powers the core, embedded memories and peripherals; voltage range 1.62-1.95 V."
      },
      {
        "number": "87",
        "name": "PA13/PGMD5",
        "type": "bidirectional",
        "description": "PIO Controller A line 13, with alternate parallel-programming function PGMD5 (see Section 21, FFPI); also SPI MISO per Table 31-2."
      },
      {
        "number": "88",
        "name": "PA14/PGMD6",
        "type": "bidirectional",
        "description": "PIO Controller A line 14, with alternate parallel-programming function PGMD6 (see Section 21, FFPI); also SPI MOSI per Table 31-2."
      },
      {
        "number": "89",
        "name": "PC10",
        "type": "bidirectional",
        "description": "PIO Controller C line 10; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "90",
        "name": "GND",
        "type": "power_in",
        "description": "Ground common to the VDDCORE and VDDIO supplies."
      },
      {
        "number": "91",
        "name": "PA15/PGMD7",
        "type": "bidirectional",
        "description": "PIO Controller A line 15, with alternate parallel-programming function PGMD7 (see Section 21, FFPI); also SPI SPCK per Table 31-2."
      },
      {
        "number": "92",
        "name": "PC11",
        "type": "bidirectional",
        "description": "PIO Controller C line 11; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "93",
        "name": "PA16/PGMD8",
        "type": "bidirectional",
        "description": "PIO Controller A line 16, with alternate parallel-programming function PGMD8 (see Section 21, FFPI); also SPI NPCS0 per Table 31-2."
      },
      {
        "number": "94",
        "name": "PC12",
        "type": "bidirectional",
        "description": "PIO Controller C line 12; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "95",
        "name": "PA17/PGMD9",
        "type": "bidirectional",
        "description": "PIO Controller A line 17, with alternate parallel-programming function PGMD9 (see Section 21, FFPI)."
      },
      {
        "number": "96",
        "name": "PB16",
        "type": "bidirectional",
        "description": "PIO Controller B line 16; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "97",
        "name": "PB15",
        "type": "bidirectional",
        "description": "PIO Controller B line 15; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "98",
        "name": "PC13",
        "type": "bidirectional",
        "description": "PIO Controller C line 13; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "99",
        "name": "PA18/PGMD10",
        "type": "bidirectional",
        "description": "PIO Controller A line 18, with alternate parallel-programming function PGMD10 (see Section 21, FFPI)."
      },
      {
        "number": "100",
        "name": "PA19/PGMD11",
        "type": "bidirectional",
        "description": "PIO Controller A line 19, with alternate parallel-programming function PGMD11 (see Section 21, FFPI)."
      },
      {
        "number": "101",
        "name": "PA20/PGMD12",
        "type": "bidirectional",
        "description": "PIO Controller A line 20, with alternate parallel-programming function PGMD12 (see Section 21, FFPI)."
      },
      {
        "number": "102",
        "name": "PA21/PGMD13",
        "type": "bidirectional",
        "description": "PIO Controller A line 21, with alternate parallel-programming function PGMD13 (see Section 21, FFPI)."
      },
      {
        "number": "103",
        "name": "PA23/PGMD15",
        "type": "bidirectional",
        "description": "PIO Controller A line 23, with alternate parallel-programming function PGMD15 (see Section 21, FFPI)."
      },
      {
        "number": "104",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Powers the peripheral I/O lines; voltage range 1.62-3.6 V."
      },
      {
        "number": "105",
        "name": "PA24",
        "type": "bidirectional",
        "description": "PIO Controller A line 24; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "106",
        "name": "PA25",
        "type": "bidirectional",
        "description": "PIO Controller A line 25; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "107",
        "name": "PA26",
        "type": "bidirectional",
        "description": "PIO Controller A line 26; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "108",
        "name": "PC20",
        "type": "bidirectional",
        "description": "PIO Controller C line 20; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "109",
        "name": "PA0/PGMNCMD",
        "type": "bidirectional",
        "description": "PIO Controller A line 0, with alternate parallel-programming function PGMNCMD (see Section 21, FFPI)."
      },
      {
        "number": "110",
        "name": "PC0",
        "type": "bidirectional",
        "description": "PIO Controller C line 0; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "111",
        "name": "PA1/PGMRDY",
        "type": "bidirectional",
        "description": "PIO Controller A line 1, with alternate parallel-programming function PGMRDY (see Section 21, FFPI)."
      },
      {
        "number": "112",
        "name": "PC1",
        "type": "bidirectional",
        "description": "PIO Controller C line 1; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "113",
        "name": "PA2/PGMNOE",
        "type": "bidirectional",
        "description": "PIO Controller A line 2, with alternate parallel-programming function PGMNOE (see Section 21, FFPI)."
      },
      {
        "number": "114",
        "name": "PC2",
        "type": "bidirectional",
        "description": "PIO Controller C line 2; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "115",
        "name": "PA3/PGMNVALID",
        "type": "bidirectional",
        "description": "PIO Controller A line 3, with alternate parallel-programming function PGMNVALID (see Section 21, FFPI)."
      },
      {
        "number": "116",
        "name": "PC3",
        "type": "bidirectional",
        "description": "PIO Controller C line 3; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "117",
        "name": "PA4/PGMM0",
        "type": "bidirectional",
        "description": "PIO Controller A line 4, with alternate parallel-programming function PGMM0 (see Section 21, FFPI)."
      },
      {
        "number": "118",
        "name": "PC4",
        "type": "bidirectional",
        "description": "PIO Controller C line 4; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "119",
        "name": "PA5/PGMM1",
        "type": "bidirectional",
        "description": "PIO Controller A line 5, with alternate parallel-programming function PGMM1 (see Section 21, FFPI)."
      },
      {
        "number": "120",
        "name": "PC5",
        "type": "bidirectional",
        "description": "PIO Controller C line 5; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "121",
        "name": "PA6/PGMM2",
        "type": "bidirectional",
        "description": "PIO Controller A line 6, with alternate parallel-programming function PGMM2 (see Section 21, FFPI)."
      },
      {
        "number": "122",
        "name": "PC6",
        "type": "bidirectional",
        "description": "PIO Controller C line 6; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "123",
        "name": "PA7/PGMM3",
        "type": "bidirectional",
        "description": "PIO Controller A line 7, with alternate parallel-programming function PGMM3 (see Section 21, FFPI)."
      },
      {
        "number": "124",
        "name": "PC7",
        "type": "bidirectional",
        "description": "PIO Controller C line 7; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "125",
        "name": "VDDCORE",
        "type": "power_in",
        "description": "Powers the core, embedded memories and peripherals; voltage range 1.62-1.95 V."
      },
      {
        "number": "126",
        "name": "GND",
        "type": "power_in",
        "description": "Ground common to the VDDCORE and VDDIO supplies."
      },
      {
        "number": "127",
        "name": "VDDIO",
        "type": "power_in",
        "description": "Powers the peripheral I/O lines; voltage range 1.62-3.6 V."
      },
      {
        "number": "128",
        "name": "PA8/PGMD0",
        "type": "bidirectional",
        "description": "PIO Controller A line 8, with alternate parallel-programming function PGMD0 (see Section 21, FFPI); also HSMCI MCDA3 per Table 36-2."
      },
      {
        "number": "129",
        "name": "PC8",
        "type": "bidirectional",
        "description": "PIO Controller C line 8; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "130",
        "name": "PA9/PGMD1",
        "type": "bidirectional",
        "description": "PIO Controller A line 9, with alternate parallel-programming function PGMD1 (see Section 21, FFPI); also TWI0 TWD0 per Table 32-4."
      },
      {
        "number": "131",
        "name": "PC9",
        "type": "bidirectional",
        "description": "PIO Controller C line 9; peripheral alternate functions are defined in Section 11.2, which is not in the provided text."
      },
      {
        "number": "132",
        "name": "PA10/PGMD2",
        "type": "bidirectional",
        "description": "PIO Controller A line 10, with alternate parallel-programming function PGMD2 (see Section 21, FFPI); also TWI0 TWCK0 per Table 32-4."
      },
      {
        "number": "133",
        "name": "PA11/PGMD3",
        "type": "bidirectional",
        "description": "PIO Controller A line 11, with alternate parallel-programming function PGMD3 (see Section 21, FFPI); also UART URXD per Table 33-2."
      },
      {
        "number": "134",
        "name": "PA12/PGMD4",
        "type": "bidirectional",
        "description": "PIO Controller A line 12, with alternate parallel-programming function PGMD4 (see Section 21, FFPI); also UART UTXD per Table 33-2."
      },
      {
        "number": "135",
        "name": "FWUP",
        "type": "input",
        "description": "Fast wake-up input feeding a falling-edge detector; it is one of the pins that must be high (with NRST, NRSTB and JTAGSEL) to enable JTAG boundary scan."
      },
      {
        "number": "136",
        "name": "SHDN",
        "type": "output",
        "description": "Shutdown control pin, listed with FWUP in the backup supply schemes, used to manage an external switch for the supplies in Backup mode."
      },
      {
        "number": "137",
        "name": "ERASE",
        "type": "input",
        "description": "ERASE pin used for Flash content erase/reprogramming; the detailed behaviour in Section 6.7 is not in the provided text."
      },
      {
        "number": "138",
        "name": "TST",
        "type": "input",
        "description": "Test select: low at power-up selects normal operation, high selects test or FFPI mode; it has an internal ~15 kΩ pull-down and may be left unconnected in normal use."
      },
      {
        "number": "139",
        "name": "VDDBU",
        "type": "power_in",
        "description": "Powers the Slow Clock oscillator and part of the System Controller; voltage range 1.62-3.6 V, and must be supplied before or at the same time as VDDIO and VDDCORE."
      },
      {
        "number": "140",
        "name": "GNDBU",
        "type": "power_in",
        "description": "Separate ground for VDDBU, which powers the Slow Clock oscillator and part of the System Controller."
      },
      {
        "number": "141",
        "name": "NRSTB",
        "type": "input",
        "description": "Reset input that must be high, together with FWUP, NRST and JTAGSEL, to enable JTAG boundary scan while TST is low."
      },
      {
        "number": "142",
        "name": "JTAGSEL",
        "type": "input",
        "description": "JTAG/SWD debug port selection: SW-DP or JTAG-DP is selected when low, and a chip reset is required after changing it."
      },
      {
        "number": "143",
        "name": "XOUT32",
        "type": "output",
        "description": "Output of the 32.768 kHz crystal oscillator; leave unconnected if the crystal oscillator is not used."
      },
      {
        "number": "144",
        "name": "XIN32",
        "type": "input",
        "description": "Input of the 32.768 kHz crystal oscillator; it can also take an external clock in bypass mode (OSCBYPASS set)."
      }
    ],
    "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: Package/MPN mapping: ATSAM3U4EA-AU is listed as LQFP144 with 256 KB Flash and Industrial -40 to 85 °; Peripheral alternate functions for PIO lines are defined in Section 11.2 (Table 11-2 to 11-4), which; Pin type inferred or ambiguous: VBG is classed as passive and its function is not described in the p",
          "23/144 pins cited to the wrong page (name found elsewhere): ['7:TMS/SWDIO@p213', '9:TCK/SWCLK@p213', '11:NRST@p213', '35:XOUT@p17']"
        ],
        "pages_sent": 70,
        "cost_usd": 0.4291,
        "at": "2026-10-30T21:58:12"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/a5a6641ed9f7c973a21ba0c342b7d4e4.pdf",
        "pages": 1163,
        "sha256": "b84d00c06a823c14",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 144,
        "described": 144,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "atsam3u4ea-au.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          22.0,
          22.0,
          1.5
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "b4d698da8bb7697b754adb5655c932342462d9b9341cdaa081b3604dbdf7559b",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "atsam3u4ea-au-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          22.0,
          22.0,
          1.5
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "0d13a1a674b60377825d88bcdcfe8b810ef43b75a48c95dedd83ca2beb2a19d4",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}