AT42QT1244-MU

{
  "schema_version": 1,
  "type": "component",
  "slug": "at42qt1244-mu",
  "title": "AT42QT1244-MU",
  "brief": "Microchip Tech Touch Sensors, 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": [
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    "sensors",
    "at42qt1244-mu",
    "factory-2.0.0",
    "extractor-text"
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  "component": {
    "mpn": "AT42QT1244-MU",
    "manufacturer": "Microchip Tech",
    "package": "QFN-32-EP(5x5)",
    "pin_count": 33,
    "category": "Sensors",
    "subcategory": "Touch Sensors",
    "datasheet": "https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-9631-AT42-QT1244_Datasheet.pdf",
    "parts": {
      "symbol": "at42qt1244-mu.kicad_sym",
      "footprint": "at42qt1244-mu.kicad_mod",
      "model_3d": "at42qt1244-mu-hero.glb",
      "model_3d_plain": "at42qt1244-mu-etched.glb",
      "model_3d_step": "at42qt1244-mu-etched.step",
      "model_3d_step_plain": "at42qt1244-mu.step",
      "lbr": "at42qt1244-mu.lbr"
    },
    "distributor_links": {
      "lcsc": "C1522270",
      "digikey": "AT42QT1244-MU-ND",
      "mouser": "556-AT42QT1244-MU"
    },
    "distributor_check": {
      "checked_at": "2026-10-29T01:54:31Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "AT42QT1244-MU-ND",
        "status": "found"
      },
      "mouser": {
        "pn": "556-AT42QT1244-MU",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "M_SYNC",
        "type": "input",
        "description": "Mains sync input; if unused, connect to Vdd."
      },
      {
        "number": "2",
        "name": "CHANGE",
        "type": "output",
        "description": "State change notification output, active low, with an internal 20 k - 50 k pull-up resistor; leave open if unused."
      },
      {
        "number": "3",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "4",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply; the regulator output capacitor should be kept close to pins 4 and 6."
      },
      {
        "number": "5",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "6",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply; the regulator output capacitor should be kept close to pins 4 and 6."
      },
      {
        "number": "7",
        "name": "X6",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "8",
        "name": "X7",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "9",
        "name": "DBG_CLK",
        "type": "output",
        "description": "Debug clock output; leave open if unused."
      },
      {
        "number": "10",
        "name": "VREF",
        "type": "power_in",
        "description": "Reference input; connect to Vss."
      },
      {
        "number": "11",
        "name": "S_SYNC/DBG_DATA",
        "type": "output",
        "description": "Oscilloscope sync / debug data output; leave open if unused."
      },
      {
        "number": "12",
        "name": "X0",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "13",
        "name": "X1",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "14",
        "name": "X2",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "15",
        "name": "X3",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "16",
        "name": "X4",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "17",
        "name": "X5",
        "type": "output",
        "description": "X matrix drive line; leave open if unused."
      },
      {
        "number": "18",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply; a 100 nF capacitor should be placed close to this pin."
      },
      {
        "number": "19",
        "name": "A1",
        "type": "input",
        "description": "I2C address bit 1, read after reset."
      },
      {
        "number": "20",
        "name": "VDD",
        "type": "power_in",
        "description": "Power supply."
      },
      {
        "number": "21",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "22",
        "name": "A0",
        "type": "input",
        "description": "I2C address bit 0, read after reset."
      },
      {
        "number": "23",
        "name": "Y0B",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "24",
        "name": "Y1B",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "25",
        "name": "Y2B",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "26",
        "name": "SMP",
        "type": "output",
        "description": "Sample output."
      },
      {
        "number": "27",
        "name": "SDA",
        "type": "output",
        "description": "Serial data line (open-drain per datasheet)."
      },
      {
        "number": "28",
        "name": "SCL",
        "type": "output",
        "description": "Serial clock line (open-drain per datasheet)."
      },
      {
        "number": "29",
        "name": "RST",
        "type": "input",
        "description": "Active-low reset with an internal 30 k - 60 k pull-up resistor; should be controlled by the host, and may be left open or connected to Vdd."
      },
      {
        "number": "30",
        "name": "Y0A",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "31",
        "name": "Y1A",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "32",
        "name": "Y2A",
        "type": "bidirectional",
        "description": "Y line connection; leave open if unused."
      },
      {
        "number": "33",
        "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-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 datasheet lists the AT42QT1244-MU as a 32-pad 5 × 5 mm QFN, but the extracted text does not ment; The pinout diagram text in the extract is garbled, so pin numbers were taken from the clear Table 1-; The datasheet labels CHANGE, SDA and SCL as open-drain (OD). The KiCad class set has no open-drain t",
          "exposed pad 33 added from the footprint"
        ],
        "pages_sent": 13,
        "cost_usd": 0.0578,
        "at": "2026-10-29T01:54:09"
      },
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        "url": "https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-9631-AT42-QT1244_Datasheet.pdf",
        "pages": 61,
        "sha256": "c5b64a3fb868a3eb",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
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        "zmin_mm": 0,
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        "sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Microchip Tech",
      "Package": "QFN-32-EP(5x5)",
      "Category": "Sensors",
      "Pins": "33"
    },
    "appearance": {
      "housing": {
        "quote": "When a finger is sensed, the signal falls since the human body acts to absorb charge from the cross-coupling",
        "page": 29,
        "doc": "ds.pdf",
        "material": "abs"
      },
      "contacts": {
        "quote": "Pin 1 ID AU 3",
        "page": 51,
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        "plating": "gold"
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      "version": 1,
      "datasheet_sha256": "c5b64a3fb868a3ebd34c778ac5b4a49d756777b1810800118ab0c1e812abe3f0"
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      "rows": [
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          "name": "Cx transverse load capacitance per key",
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        {
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        },
        {
          "name": "High input logic level",
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          "min": 0.6,
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        },
        {
          "name": "Low output voltage",
          "symbol": "Vol",
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          "min": null,
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          "conditions": "Vdd = 3.0 V",
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        {
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        },
        {
          "name": "Input leakage current",
          "symbol": "Iil",
          "kind": "electrical",
          "unit": "µA",
          "min": null,
          "typ": null,
          "max": 1,
          "conditions": "",
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        },
        {
          "name": "Internal pull-up resistors (CHANGE pin)",
          "symbol": "Rp",
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          "conditions": "Cs = 4.7 nF, Rs = 470 k, Ta = recommended range",
          "source_page": 48,
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        },
        {
          "name": "Internal RST pull-up resistor",
          "symbol": "Rrst",
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          "source_page": 48,
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        },
        {
          "name": "Burst center frequency",
          "symbol": "Fc",
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          "unit": "kHz",
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          "conditions": "Cs = 4.7 nF, Rs = 470 k, Ta = recommended range",
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    "name": "Ray",
    "email": "[email protected]"
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