BQ40Z50RSMR-R1

{
  "schema_version": 1,
  "type": "component",
  "slug": "bq40z50rsmr-r1",
  "title": "BQ40Z50RSMR-R1",
  "brief": "Texas Instruments Battery Management, VQFN-32-EP(4x4). Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
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    "pmic",
    "bq40z50rsmr-r1"
  ],
  "component": {
    "mpn": "BQ40Z50RSMR-R1",
    "manufacturer": "Texas Instruments",
    "package": "VQFN-32-EP(4x4)",
    "pin_count": 33,
    "category": "PMIC",
    "subcategory": "Battery Management",
    "datasheet": "https://www.ti.com/lit/ds/symlink/bq40z50rsmr-r1.pdf",
    "parts": {
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "PBI",
        "type": "power_in",
        "description": "Power supply backup input pin. Backup rail that maintains RAM/RTC context when primary supplies are lost."
      },
      {
        "number": "2",
        "name": "VC4",
        "type": "input",
        "description": "Sense voltage input for the most positive cell (Cell 4) and balance current input for that cell."
      },
      {
        "number": "3",
        "name": "VC3",
        "type": "input",
        "description": "Sense voltage input for second-most-positive cell (Cell 3), balance current input, and return path for Cell 4 balance current."
      },
      {
        "number": "4",
        "name": "VC2",
        "type": "input",
        "description": "Sense voltage input for third-most-positive cell (Cell 2), balance current input, and return path for Cell 3 balance current."
      },
      {
        "number": "5",
        "name": "VC1",
        "type": "input",
        "description": "Sense voltage input for the least positive cell (Cell 1), balance current input, and return path for Cell 2 balance current."
      },
      {
        "number": "6",
        "name": "SRN",
        "type": "input",
        "description": "Coulomb-counter negative sense input. Integrates the small voltage across the sense resistor between SRP and SRN."
      },
      {
        "number": "7",
        "name": "NC",
        "type": "unconnected",
        "description": "Not internally connected. Connect to VSS per the datasheet."
      },
      {
        "number": "8",
        "name": "SRP",
        "type": "input",
        "description": "Coulomb-counter positive sense input; top of the sense resistor. Integrates the small voltage between SRP and SRN."
      },
      {
        "number": "9",
        "name": "VSS",
        "type": "power_in",
        "description": "Device ground reference."
      },
      {
        "number": "10",
        "name": "TS1",
        "type": "input",
        "description": "Temperature sensor 1 thermistor input (NTC). Ratiometric input via internal 18 kΩ pull-up to 1.8 V."
      },
      {
        "number": "11",
        "name": "TS2",
        "type": "input",
        "description": "Temperature sensor 2 thermistor input."
      },
      {
        "number": "12",
        "name": "TS3",
        "type": "input",
        "description": "Temperature sensor 3 thermistor input."
      },
      {
        "number": "13",
        "name": "TS4",
        "type": "input",
        "description": "Temperature sensor 4 thermistor input."
      },
      {
        "number": "14",
        "name": "NC",
        "type": "unconnected",
        "description": "Not internally connected."
      },
      {
        "number": "15",
        "name": "BTP_INT",
        "type": "output",
        "description": "Battery Trip Point interrupt output. Signals the host when configured state-of-charge thresholds are crossed."
      },
      {
        "number": "16",
        "name": "PRES/SHUTDN",
        "type": "input",
        "description": "Host-present input for removable packs, or emergency system-shutdown input for embedded packs. Function is firmware-configurable."
      },
      {
        "number": "17",
        "name": "DISP",
        "type": "input",
        "description": "Display control input for the LED state-of-charge indicator. Asserting this pin activates the LEDCNTLA/B/C outputs."
      },
      {
        "number": "18",
        "name": "SMBD",
        "type": "bidirectional",
        "description": "SMBus data line (open-drain). Compatible with SMBus v1.1; requires external pull-up."
      },
      {
        "number": "19",
        "name": "SMBC",
        "type": "bidirectional",
        "description": "SMBus clock line (open-drain). Compatible with SMBus v1.1; requires external pull-up."
      },
      {
        "number": "20",
        "name": "LEDCNTLA",
        "type": "output",
        "description": "LED display segment A output; drives external LEDs per firmware configuration (fuel gauge display)."
      },
      {
        "number": "21",
        "name": "LEDCNTLB",
        "type": "output",
        "description": "LED display segment B output; drives external LEDs per firmware configuration."
      },
      {
        "number": "22",
        "name": "LEDCNTLC",
        "type": "output",
        "description": "LED display segment C output; drives external LEDs per firmware configuration."
      },
      {
        "number": "23",
        "name": "PTC",
        "type": "input",
        "description": "Safety PTC thermistor input. Tie both PTC and PTCEN to VSS to disable the PTC safety detector."
      },
      {
        "number": "24",
        "name": "PTCEN",
        "type": "input",
        "description": "PTC enable input. Connect to BAT to enable PTC detection; tie both PTC and PTCEN to VSS to disable."
      },
      {
        "number": "25",
        "name": "FUSE",
        "type": "output",
        "description": "Fuse drive output. Drives an external chemical fuse to permanently disable the pack under 2nd-level safety events."
      },
      {
        "number": "26",
        "name": "VCC",
        "type": "power_in",
        "description": "Secondary power supply input (typically PACK-side sourced through a diode) for the internal LDO/regulators."
      },
      {
        "number": "27",
        "name": "PACK",
        "type": "input",
        "description": "Pack-side voltage sense input. Monitors PACK+ node for insertion/removal and pre-charge control."
      },
      {
        "number": "28",
        "name": "DSG",
        "type": "output",
        "description": "High-side N-channel discharge FET gate drive output. Charge-pumped above BAT to fully enhance the external DSG FET."
      },
      {
        "number": "29",
        "name": "NC",
        "type": "unconnected",
        "description": "Not internally connected."
      },
      {
        "number": "30",
        "name": "PCHG",
        "type": "output",
        "description": "P-channel pre-charge FET gate drive output."
      },
      {
        "number": "31",
        "name": "CHG",
        "type": "output",
        "description": "High-side N-channel charge FET gate drive output. Charge-pumped above BAT to fully enhance the external CHG FET."
      },
      {
        "number": "32",
        "name": "BAT",
        "type": "power_in",
        "description": "Primary power supply input pin, connected to the top of the cell stack."
      },
      {
        "number": "33",
        "name": "EP",
        "type": "passive",
        "description": "Exposed thermal pad on the underside of the VQFN package. Solder to the PCB ground plane for thermal and mechanical performance."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/bq40z50rsmr-r1.pdf",
        "pages": 55,
        "sha256": "8fb42a3177aabd62",
        "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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  },
  "metadata": {
    "specs": {
      "Manufacturer": "Texas Instruments",
      "Package": "VQFN-32-EP(4x4)",
      "Category": "PMIC",
      "Pins": "33"
    }
  },
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      "mpn": "BQ40Z50RSMR-R1",
      "kind": "packaging"
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    {
      "mpn": "BQ40Z50RSMR-R1RSMT",
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  "discovery_pitch": "BQ40Z50RSMR-R1 (Texas Instruments) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
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  "updated_at": "2026-09-24T18:05:17.293Z"
}