A4985SETTR-T

{
  "slug": "a4985settr-t",
  "version": "0.1.0",
  "type": "component",
  "description": "Allegro MicroSystems, LLC Motor Driver ICs, QFN-32-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "power management ics",
    "a4985settr-t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "a4985settr-t.kicad_sym",
    "a4985settr-t.kicad_mod",
    "a4985settr-t.glb",
    "a4985settr-t.step",
    "a4985settr-t.lbr",
    "docs/hero.png",
    "docs/a4985settr-t-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "a4985settr-t-hero.glb",
    "a4985settr-t-hero.overlay.json",
    "a4985settr-t-etched.glb"
  ],
  "component": {
    "mpn": "A4985SETTR-T",
    "manufacturer": "Allegro MicroSystems, LLC",
    "package": "QFN-32-EP(5x5)",
    "pin_count": 33,
    "category": "Power Management ICs",
    "subcategory": "Motor Driver ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/acec5e3b36848f46f6eac7b1d03d83a7.pdf",
    "parts": {
      "symbol": "a4985settr-t.kicad_sym",
      "footprint": "a4985settr-t.kicad_mod",
      "model_3d": "a4985settr-t-hero.glb",
      "model_3d_plain": "a4985settr-t-etched.glb",
      "model_3d_step": "a4985settr-t-etched.step",
      "model_3d_step_plain": "a4985settr-t.step",
      "lbr": "a4985settr-t.lbr"
    },
    "distributor_links": {
      "lcsc": "C2150462",
      "digikey": "620-A4985SETTR-TTR-ND",
      "mouser": "250-A4985SETTR-T"
    },
    "distributor_check": {
      "checked_at": "2026-10-30T23:57:44Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": "620-A4985SETTR-TTR-ND",
        "status": "found",
        "lifecycle": "Active"
      },
      "mouser": {
        "pn": "250-A4985SETTR-T",
        "status": "found"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "OUT2B",
        "type": "output",
        "description": "DMOS full bridge 2 output B; motor outputs are rated -2.0 to 37 V and output current ±1 A."
      },
      {
        "number": "2",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; added between critical output, sense and supply pins on the ET package for no-smoke-no-fire compliance."
      },
      {
        "number": "3",
        "name": "VBB2",
        "type": "power_in",
        "description": "Load supply for bridge 2; operating range 8 to 35 V, absolute maximum 35 V."
      },
      {
        "number": "4",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; added between critical output, sense and supply pins on the ET package for no-smoke-no-fire compliance."
      },
      {
        "number": "5",
        "name": "ENABLE",
        "type": "input",
        "description": "Logic input; logic high disables all FET outputs and logic low enables them as required, while STEP, DIR, MS1 and MS2 remain active."
      },
      {
        "number": "6",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; must be tied together with the other GND pins externally to the exposed pad ground plane."
      },
      {
        "number": "7",
        "name": "CP1",
        "type": "passive",
        "description": "Charge pump capacitor terminal; a 0.1 µF ceramic capacitor is connected between CP1 and CP2."
      },
      {
        "number": "8",
        "name": "CP2",
        "type": "passive",
        "description": "Charge pump capacitor terminal; a 0.1 µF ceramic capacitor is connected between CP1 and CP2."
      },
      {
        "number": "9",
        "name": "VCP",
        "type": "power_out",
        "description": "Charge pump reservoir capacitor terminal; a 0.1 µF ceramic capacitor is required between VCP and VBB."
      },
      {
        "number": "10",
        "name": "VREG",
        "type": "power_out",
        "description": "Internally generated regulator for sink-side FET gates, nominal 7 V; decouple with a 0.22 µF ceramic capacitor to ground."
      },
      {
        "number": "11",
        "name": "MS1",
        "type": "input",
        "description": "Logic input for microstep resolution select (with MS2), 100 kΩ internal pull-down; changes take effect on the next STEP rising edge."
      },
      {
        "number": "12",
        "name": "MS2",
        "type": "input",
        "description": "Logic input for microstep resolution select (with MS1), 50 kΩ internal pull-down; changes take effect on the next STEP rising edge."
      },
      {
        "number": "13",
        "name": "RESET",
        "type": "input",
        "description": "Logic input; when low it sets the translator to the Home state and turns off all FET outputs, and STEP inputs are ignored until it is set high."
      },
      {
        "number": "14",
        "name": "ROSC",
        "type": "passive",
        "description": "Timing set; tying to VDD, to ground, or through a resistor to ground selects the fixed off-time and decay mode, with tOFF ≈ ROSC / 825 µs for the resistor setting."
      },
      {
        "number": "15",
        "name": "SLEEP",
        "type": "input",
        "description": "Logic input; logic low puts the device into Sleep mode (under 10 µA), and 1 ms must elapse after leaving Sleep before a STEP command."
      },
      {
        "number": "16",
        "name": "VDD",
        "type": "power_in",
        "description": "Logic supply; operating range 3.0 to 5.5 V, with 3.3 V and 5 V logic compatibility."
      },
      {
        "number": "17",
        "name": "STEP",
        "type": "input",
        "description": "Logic input; a low-to-high transition advances the motor one microstep, with minimum high and low pulse widths of 1 µs."
      },
      {
        "number": "18",
        "name": "REF",
        "type": "input",
        "description": "Gm reference voltage input; reference input voltage range is 0 to 4 V."
      },
      {
        "number": "19",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; must be tied together with the other GND pins externally to the exposed pad ground plane."
      },
      {
        "number": "20",
        "name": "DIR",
        "type": "input",
        "description": "Logic input that sets the direction of motor rotation; changes take effect on the next STEP rising edge."
      },
      {
        "number": "21",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; added between critical output, sense and supply pins on the ET package for no-smoke-no-fire compliance."
      },
      {
        "number": "22",
        "name": "VBB1",
        "type": "power_in",
        "description": "Load supply for bridge 1; operating range 8 to 35 V, absolute maximum 35 V."
      },
      {
        "number": "23",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; added between critical output, sense and supply pins on the ET package for no-smoke-no-fire compliance."
      },
      {
        "number": "24",
        "name": "OUT1B",
        "type": "output",
        "description": "DMOS full bridge 1 output B; motor outputs are rated -2.0 to 37 V and output current ±1 A."
      },
      {
        "number": "25",
        "name": "SENSE1",
        "type": "passive",
        "description": "Sense resistor terminal for bridge 1; the SENSE pin voltage must not exceed the 0.5 V maximum rating."
      },
      {
        "number": "26",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; added between critical output, sense and supply pins on the ET package for no-smoke-no-fire compliance."
      },
      {
        "number": "27",
        "name": "OUT1A",
        "type": "output",
        "description": "DMOS full bridge 1 output A; motor outputs are rated -2.0 to 37 V and output current ±1 A."
      },
      {
        "number": "28",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; added between critical output, sense and supply pins on the ET package for no-smoke-no-fire compliance."
      },
      {
        "number": "29",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; added between critical output, sense and supply pins on the ET package for no-smoke-no-fire compliance."
      },
      {
        "number": "30",
        "name": "OUT2A",
        "type": "output",
        "description": "DMOS full bridge 2 output A; motor outputs are rated -2.0 to 37 V and output current ±1 A."
      },
      {
        "number": "31",
        "name": "NC",
        "type": "unconnected",
        "description": "No connection; added between critical output, sense and supply pins on the ET package for no-smoke-no-fire compliance."
      },
      {
        "number": "32",
        "name": "SENSE2",
        "type": "passive",
        "description": "Sense resistor terminal for bridge 2; the SENSE pin voltage must not exceed the 0.5 V maximum rating."
      },
      {
        "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 exposed thermal pad is a non-numbered pad listed in the terminal table (PAD, exposed pad for the; The ET column of the Terminal List Table and the ET pinout diagram on page 18 were cross-checked and; The output schema has no field for specs, so the headline parameters (VBB 8 to 35 V, VDD 3.0 to 5.5 ",
          "exposed pad 33 added from the footprint"
        ],
        "pages_sent": 22,
        "cost_usd": 0.1069,
        "at": "2026-10-30T23:57:31"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/acec5e3b36848f46f6eac7b1d03d83a7.pdf",
        "pages": 22,
        "sha256": "48496bd05457af8f",
        "source_tier": "lcsc"
      },
      "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": "a4985settr-t.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.875
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "a4985settr-t-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.875
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "58b04f52616791671b7883f40ebf91dfe0d90b610fe006c74bfa5f8ad45efaf4",
        "checked": "2026-10-30",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ],
    "package_dims": {
      "package_code": "ET",
      "source_page": 20,
      "D": {
        "nom_mm": 5.0,
        "range_mm": [
          null,
          null
        ]
      },
      "E1": {
        "nom_mm": 5.0,
        "range_mm": [
          null,
          null
        ]
      },
      "e": {
        "nom_mm": 0.5,
        "range_mm": [
          null,
          null
        ]
      },
      "source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
      "model_check": {
        "file": "a4985settr-t.step",
        "verdict": "SKIP",
        "reasons": [
          "the datasheet dimensions give no height or body size to compare"
        ],
        "by": "factory/package_fit.py"
      }
    }
  }
}