BL0972

{
  "schema_version": 1,
  "type": "component",
  "slug": "bl0972",
  "title": "BL0972",
  "brief": "BL Shanghai Belling Energy Metering, TSSOP-20. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "data acquisition",
    "bl0972"
  ],
  "component": {
    "mpn": "BL0972",
    "manufacturer": "BL Shanghai Belling",
    "package": "TSSOP-20",
    "pin_count": 20,
    "category": "Data Acquisition",
    "subcategory": "Energy Metering",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040352136712192",
    "parts": {
      "symbol": "bl0972.kicad_sym",
      "footprint": "bl0972.kicad_mod",
      "model_3d": "bl0972-etched.glb",
      "model_3d_plain": "bl0972.glb",
      "model_3d_step": "bl0972-etched.step",
      "model_3d_step_plain": "bl0972.step",
      "lbr": "bl0972.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "VP",
        "type": "input",
        "description": "Voltage-channel differential input, positive side. Max differential input +/-0.6 V at 1x PGA gain (approx +/-37.5 mV at 16x). Referenced to VN."
      },
      {
        "number": "2",
        "name": "RST",
        "type": "input",
        "description": "Active-low chip reset. Held high through a pull-up in reference designs; asserted low to reinitialize the IC."
      },
      {
        "number": "3",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground return. Should be routed separately from the current-sense return per PCB layout guidance."
      },
      {
        "number": "4",
        "name": "DGND",
        "type": "power_in",
        "description": "Digital ground return for the SPI and control logic."
      },
      {
        "number": "5",
        "name": "CS",
        "type": "input",
        "description": "SPI chip-select input, active low. Frames each SPI transaction to the host MCU."
      },
      {
        "number": "6",
        "name": "DOUT",
        "type": "output",
        "description": "SPI serial data out (MISO). Drives register read data back to the host."
      },
      {
        "number": "7",
        "name": "DIN",
        "type": "input",
        "description": "SPI serial data in (MOSI). Receives command/address/data words from the host."
      },
      {
        "number": "8",
        "name": "SCLK",
        "type": "input",
        "description": "SPI serial clock input. Full timing specification is in the standalone datasheet (BL0972_Datasheet_Vx.x.pdf)."
      },
      {
        "number": "9",
        "name": "IRQ",
        "type": "output",
        "description": "Interrupt/status output. Reference designs drive a status LED via a 1.2 k series resistor."
      },
      {
        "number": "10",
        "name": "VPP",
        "type": "passive",
        "description": "VPP factory/test pin. Brought out to a header in reference designs; not used in normal operation."
      },
      {
        "number": "11",
        "name": "CF",
        "type": "output",
        "description": "Energy calibration pulse output. Configurable through MODE3 register; frequency scales with active power (CF_CNT counter). Reference boards route it to an LED indicator."
      },
      {
        "number": "12",
        "name": "MF",
        "type": "output",
        "description": "Multi-function output, default function is overcurrent alarm (fast-RMS threshold). Alternate roles are selected through the MODE3 register."
      },
      {
        "number": "13",
        "name": "DVDD18",
        "type": "power_out",
        "description": "Internal 1.8 V digital LDO output. Requires an external decoupling capacitor (0.1 uF) placed close to the pin; do NOT drive externally."
      },
      {
        "number": "14",
        "name": "VDD",
        "type": "power_in",
        "description": "Main 3.3 V supply input. Decoupled with a local 0.1 uF placed close to the pin per the PCB layout guidance."
      },
      {
        "number": "15",
        "name": "AGND",
        "type": "power_in",
        "description": "Analog ground return (second AGND pin)."
      },
      {
        "number": "16",
        "name": "IN",
        "type": "input",
        "description": "Current-channel differential input, negative side. Paired with IP; supports 1/2/8/16x PGA (16x gives approx +/-37.5 mV max differential)."
      },
      {
        "number": "17",
        "name": "IP",
        "type": "input",
        "description": "Current-channel differential input, positive side. Route with IN as a tight differential pair to the shunt or CT burden network."
      },
      {
        "number": "18",
        "name": "VT",
        "type": "passive",
        "description": "Auxiliary analog pin (VT). In the AC reference design it is tied via an STV312-class device to GND; used for internal biasing/test."
      },
      {
        "number": "19",
        "name": "Vref",
        "type": "power_out",
        "description": "Internal 1.097 V ADC voltage reference output. Requires an external 0.1 uF decoupling capacitor to AGND close to the pin."
      },
      {
        "number": "20",
        "name": "VN",
        "type": "input",
        "description": "Voltage-channel differential input, negative side. Paired with VP."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589040352136712192",
        "pages": 10,
        "sha256": "69d699ccb472717e",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "bl0972.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.2
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "97339947f3a7196470ec2f1d9f9b92bb2fc2ab66ad53be0cf105192585ef3c9a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "bl0972-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.2
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "a571a5b141b87dba981a3c4de817ca05788bc75379113b6e6073ee57296b4a3f",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "BL Shanghai Belling",
      "Package": "TSSOP-20",
      "Category": "Data Acquisition",
      "Pins": "20"
    }
  },
  "variants": [],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "bl0972"
  ],
  "discovery_pitch": "BL0972 (BL Shanghai Belling) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "bl0972.kicad_sym",
    "bl0972.kicad_mod",
    "bl0972.glb",
    "bl0972.step",
    "bl0972.lbr",
    "docs/hero.png",
    "docs/bl0972-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T17:45:45.169Z"
}