AT42QT1481-AUR

{
  "schema_version": 1,
  "type": "component",
  "slug": "at42qt1481-aur",
  "title": "AT42QT1481-AUR",
  "brief": "Microchip Tech Touch Sensors, TQFP-44(10x10). 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",
    "sensors",
    "at42qt1481-aur",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "AT42QT1481-AUR",
    "manufacturer": "Microchip Tech",
    "package": "TQFP-44(10x10)",
    "pin_count": 44,
    "category": "Sensors",
    "subcategory": "Touch Sensors",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/807691fe4b8b349a225d1f89dc088598.pdf",
    "parts": {
      "symbol": "at42qt1481-aur.kicad_sym",
      "footprint": "at42qt1481-aur.kicad_mod",
      "model_3d": "at42qt1481-aur-hero.glb",
      "model_3d_plain": "at42qt1481-aur-etched.glb",
      "model_3d_step": "at42qt1481-aur-etched.step",
      "model_3d_step_plain": "at42qt1481-aur.step",
      "lbr": "at42qt1481-aur.lbr"
    },
    "distributor_links": {
      "lcsc": "C2652062",
      "digikey": "AT42QT1481-AURTR-ND",
      "mouser": "556-AT42QT1481-AUR"
    },
    "distributor_check": {
      "checked_at": "2026-10-30T23:45:42Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "AT42QT1481-AURTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "556-AT42QT1481-AUR",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "MOSI",
        "type": "input",
        "description": "SPI data input; leave open if unused."
      },
      {
        "number": "2",
        "name": "MISO",
        "type": "output",
        "description": "SPI data output; leave open if unused."
      },
      {
        "number": "3",
        "name": "SCK",
        "type": "input",
        "description": "SPI clock input; tie to Vdd if unused."
      },
      {
        "number": "4",
        "name": "RST",
        "type": "input",
        "description": "Reset, active low, with internal 30 k - 60 k pull-up resistor; should be controlled by the host; tie to Vdd if unused."
      },
      {
        "number": "5",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply pin."
      },
      {
        "number": "6",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground pin."
      },
      {
        "number": "7",
        "name": "XT2",
        "type": "output",
        "description": "Connection for ceramic resonator or crystal, 16 MHz."
      },
      {
        "number": "8",
        "name": "XT1",
        "type": "input",
        "description": "Connection for ceramic resonator or crystal, 16 MHz."
      },
      {
        "number": "9",
        "name": "RX",
        "type": "input",
        "description": "UART receive data input; tie to Vdd if unused."
      },
      {
        "number": "10",
        "name": "TX",
        "type": "output",
        "description": "UART transmit data output with internal 20 k - 50 k pull-up resistor; leave open if unused."
      },
      {
        "number": "11",
        "name": "WS",
        "type": "input",
        "description": "Wake-up from sleep input and/or sync input; tie to Vdd if unused."
      },
      {
        "number": "12",
        "name": "SMP",
        "type": "bidirectional",
        "description": "Sample output pin."
      },
      {
        "number": "13",
        "name": "Y3A",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "14",
        "name": "Y2A",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "15",
        "name": "Y1A",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "16",
        "name": "Y0A",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "17",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply pin."
      },
      {
        "number": "18",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground pin."
      },
      {
        "number": "19",
        "name": "X0",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "20",
        "name": "X1",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "21",
        "name": "X2",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "22",
        "name": "X3",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "23",
        "name": "X4",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "24",
        "name": "X5",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "25",
        "name": "X6",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "26",
        "name": "X7",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "27",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply pin."
      },
      {
        "number": "28",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground pin."
      },
      {
        "number": "29",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply pin."
      },
      {
        "number": "30",
        "name": "Y0B",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "31",
        "name": "Y1B",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "32",
        "name": "Y2B",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "33",
        "name": "Y3B",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "34",
        "name": "Y4A",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "35",
        "name": "Y4B",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "36",
        "name": "Y5A",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "37",
        "name": "Y5B",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "38",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply pin."
      },
      {
        "number": "39",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground pin."
      },
      {
        "number": "40",
        "name": "STATUS / DBG_DATA",
        "type": "output",
        "description": "Status output (active low) or Debug Data, with internal 20 k - 50 k pull-up resistor; leave open if unused."
      },
      {
        "number": "41",
        "name": "DRDY",
        "type": "bidirectional",
        "description": "Open-drain comms-ready I/O with internal 20 k - 50 k pull-up; 1 = comms ready after a 100 µs grace period; this pin MUST be used."
      },
      {
        "number": "42",
        "name": "VREF",
        "type": "power_in",
        "description": "Connect to Vss."
      },
      {
        "number": "43",
        "name": "S_SYNC / DBG_CLK",
        "type": "output",
        "description": "Scope synchronization output or Debug Clock; leave open if unused."
      },
      {
        "number": "44",
        "name": "SS",
        "type": "input",
        "description": "SPI slave select with internal 20 k - 50 k pull-up resistor; leave open if unused."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
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        "primary_model": "claude-haiku-5-5",
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        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The pin diagram on page 3 is garbled in text extraction and was not used for pin assignments. Pin nu; The -AUR suffix is tape and reel of the same 44-pin 10 x 10 mm TQFP package (QS738, page 62), so the; The datasheet uses P (ground or power) for all supply pins, without distinguishing VDD from VSS. Bot"
        ],
        "pages_sent": 15,
        "cost_usd": 0.0682,
        "at": "2026-10-30T23:45:31"
      },
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        "pages": 73,
        "sha256": "c079e60007fe4fb7",
        "source_tier": "mfr"
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 44,
        "described": 44,
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        "refuses_to_fabricate": true
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        "sha256": "61ecec1147f835d2c9d165c450b1c8d53e65b038f6ca1dac3066a2dfb1bbbb85",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "TQFP-44(10x10)",
      "Category": "Sensors",
      "Pins": "44"
    },
    "appearance": {
      "housing": {
        "quote": "When a finger is sensed, the signal falls since the human body acts to absorb charge from the cross-coupling",
        "page": 40,
        "doc": "ds.pdf",
        "material": "abs"
      },
      "contacts": {
        "quote": "AT42QT1481-AU QS738 44-pin 10 × 10 mm TQFP RoHS compliant IC AT42QT1481-AUR QS738 44-pin 10 × 10 mm TQFP RoHS compliant IC - Tape and reel",
        "page": 62,
        "doc": "ds.pdf",
        "plating": "gold"
      },
      "version": 1,
      "datasheet_sha256": "c079e60007fe4fb722a01341a19c02fb5845e0e49df29c73adff8da37e1bcdc9"
    },
    "characteristics": {
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          "name": "Vdd supply voltage (recommended operating range)",
          "symbol": "Vdd",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 4.75,
          "typ": null,
          "max": 5.25,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Operating temperature",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 105,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 125,
          "conditions": "",
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        },
        {
          "name": "Supply ripple + noise",
          "symbol": "",
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          "unit": "mV p-p",
          "min": null,
          "typ": null,
          "max": 20,
          "conditions": "",
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          "source": "datasheet"
        },
        {
          "name": "Cx transverse load capacitance per key",
          "symbol": "Cx",
          "kind": "recommended_operating",
          "unit": "pF",
          "min": 0,
          "typ": null,
          "max": 20,
          "conditions": "",
          "source_page": 58,
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        },
        {
          "name": "Oscillator frequency tolerance (Fosc nominal 16 MHz)",
          "symbol": "Fosc",
          "kind": "tolerance",
          "unit": "%",
          "min": -2,
          "typ": null,
          "max": 2,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Vdd absolute maximum supply voltage",
          "symbol": "Vdd",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 6,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Max continuous pin current, any control or drive pin",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -10,
          "typ": null,
          "max": 10,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Frequency of operation",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "MHz",
          "min": null,
          "typ": null,
          "max": 17,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "EEPROM setups maximum writes",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "write cycles",
          "min": null,
          "typ": null,
          "max": 100000,
          "conditions": "",
          "source_page": 58,
          "source": "datasheet"
        },
        {
          "name": "Low output voltage",
          "symbol": "Vol",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 0.6,
          "conditions": "4mA sink",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "High output voltage",
          "symbol": "Voh",
          "kind": "electrical",
          "unit": "V",
          "min": 4.2,
          "typ": null,
          "max": null,
          "conditions": "1 mA source",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "Input leakage current",
          "symbol": "Iil",
          "kind": "electrical",
          "unit": "µA",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "Acquisition resolution",
          "symbol": "Ar",
          "kind": "electrical",
          "unit": "bits",
          "min": null,
          "typ": 9,
          "max": 11,
          "conditions": "",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "Internal pull-up resistors (DRDY, SS, TX, STATUS pins)",
          "symbol": "Rp",
          "kind": "electrical",
          "unit": "k",
          "min": 20,
          "typ": null,
          "max": 50,
          "conditions": "DRDY, SS, TX, STATUS pins",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "Internal RST pull-up resistor",
          "symbol": "Rrst",
          "kind": "electrical",
          "unit": "k",
          "min": 30,
          "typ": null,
          "max": 60,
          "conditions": "",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "SS to first CLK edge",
          "symbol": "S1",
          "kind": "timing",
          "unit": "ns",
          "min": 125,
          "typ": null,
          "max": null,
          "conditions": "SPI parameter controlled by host",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "CLK to valid MISO",
          "symbol": "S2",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 20,
          "conditions": "SPI parameter controlled by QT1481",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "Last CLK to SS",
          "symbol": "S3",
          "kind": "timing",
          "unit": "ns",
          "min": 25,
          "typ": null,
          "max": null,
          "conditions": "SPI parameter controlled by host",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "SS to 3-state MISO",
          "symbol": "S4",
          "kind": "timing",
          "unit": "ns",
          "min": null,
          "typ": null,
          "max": 20,
          "conditions": "SPI parameter controlled by QT1481",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "SS to falling DRDY",
          "symbol": "S5",
          "kind": "timing",
          "unit": "µs",
          "min": null,
          "typ": null,
          "max": 20,
          "conditions": "SPI parameter controlled by QT1481",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "DRDY low pulse width",
          "symbol": "S6",
          "kind": "timing",
          "unit": "µs",
          "min": 1,
          "typ": null,
          "max": null,
          "conditions": "SPI parameter controlled by QT1481",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "CLK low pulse width",
          "symbol": "S7",
          "kind": "timing",
          "unit": "ns",
          "min": 125,
          "typ": null,
          "max": null,
          "conditions": "SPI parameter controlled by host",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "CLK high pulse width",
          "symbol": "S8",
          "kind": "timing",
          "unit": "ns",
          "min": 125,
          "typ": null,
          "max": null,
          "conditions": "SPI parameter controlled by host",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "CLK period",
          "symbol": "S9",
          "kind": "timing",
          "unit": "ns",
          "min": 250,
          "typ": null,
          "max": null,
          "conditions": "SPI parameter controlled by host",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "SPI clock rate",
          "symbol": "Fck",
          "kind": "timing",
          "unit": "MHz",
          "min": null,
          "typ": null,
          "max": 4,
          "conditions": "SPI parameter controlled by host",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "Supply current, running",
          "symbol": "Iddr",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 13,
          "max": null,
          "conditions": "",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "Supply current, sleeping",
          "symbol": "Idds",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": 15,
          "max": null,
          "conditions": "",
          "source_page": 59,
          "source": "datasheet"
        },
        {
          "name": "Vdd internal reset voltage",
          "symbol": "Vr",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 4,
          "max": null,
          "conditions": "",
          "source_page": 59,
          "source": "datasheet"
        }
      ]
    }
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    "name": "Ray",
    "email": "[email protected]"
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