BL0940

{
  "schema_version": 1,
  "type": "component",
  "slug": "bl0940",
  "title": "BL0940",
  "brief": "BL(Shanghai Belling) Energy Metering ICs, TSSOP-14. 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",
    "data converters",
    "bl0940",
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  "component": {
    "mpn": "BL0940",
    "manufacturer": "BL(Shanghai Belling)",
    "package": "TSSOP-14",
    "pin_count": 14,
    "category": "Data Converters",
    "subcategory": "Energy Metering ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/4182bdc6ac64eefc3cf2e46f258f61ea.pdf",
    "parts": {
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      "lbr": "bl0940.lbr"
    },
    "distributor_links": {
      "lcsc": "C691894"
    },
    "distributor_check": {
      "checked_at": "2026-10-21T06:30:16Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD",
        "type": "power_in",
        "description": "Chip supply pin at +3.3V, with the datasheet specifying a supply range of 3.0 V to 3.6 V and absolute maximum of -0.3 V to +4 V."
      },
      {
        "number": "2",
        "name": "VT",
        "type": "input",
        "description": "External temperature sensor signal input to the SAR ADC, whose maximum input is VDD/2 (full scale 1024 codes)."
      },
      {
        "number": "3",
        "name": "IP1",
        "type": "input",
        "description": "Current channel analog input (differential with IN1), with a maximum differential voltage of ±50 mV (35 mV rms)."
      },
      {
        "number": "4",
        "name": "IN1",
        "type": "input",
        "description": "Current channel analog input (differential with IP1), with a maximum differential voltage of ±50 mV (35 mV rms)."
      },
      {
        "number": "5",
        "name": "VP",
        "type": "input",
        "description": "Voltage signal input (differential with VN), with a maximum differential voltage of ±100 mV (70 mV rms)."
      },
      {
        "number": "6",
        "name": "VN",
        "type": "input",
        "description": "Voltage signal input (differential with VP), with a maximum differential voltage of ±100 mV (70 mV rms)."
      },
      {
        "number": "7",
        "name": "GND",
        "type": "power_in",
        "description": "Chip ground, referenced at 0 V for all supply and signal specifications."
      },
      {
        "number": "8",
        "name": "ZX",
        "type": "output",
        "description": "Voltage zero-crossing indicator output, which goes low during the positive half-cycle and high during the negative half-cycle with a delay of about 570 µs relative to the input signal."
      },
      {
        "number": "9",
        "name": "CF",
        "type": "output",
        "description": "Energy pulse output whose function is multiplexed by the MODE register (energy pulse, over-current/leakage alarm, or temperature alarm), with a 50% duty cycle for periods under 180 ms."
      },
      {
        "number": "10",
        "name": "SEL",
        "type": "input",
        "description": "UART/SPI mode select (0 = UART, 1 = SPI) with an internal pull-down of 56.9 kΩ, so floating selects UART and tying directly to VDD selects SPI."
      },
      {
        "number": "11",
        "name": "SCLK",
        "type": "input",
        "description": "SPI clock input (Mode 1, CPOL=0, CPHA=1, maximum 900 kHz); may be left floating in UART mode."
      },
      {
        "number": "12",
        "name": "RX/SDI",
        "type": "input",
        "description": "Multiplexed pin serving as UART RX or SPI data input (DIN), with logic input high level at least 2.6 V and low level at most 0.8 V at VDD=3.3 V ±5%."
      },
      {
        "number": "13",
        "name": "TX/SDO",
        "type": "output",
        "description": "Multiplexed pin serving as UART TX or SPI data output (DOUT), which requires an external pull-up resistor and outputs high level of at least VDD-0.5 V at 5 mA."
      },
      {
        "number": "14",
        "name": "VPP",
        "type": "unconnected",
        "description": "Reserved pin that should be left floating (not connected)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
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        "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: Pin 13 (TX/SDO) is typed as output, but the datasheet states SDO goes to high-impedance (tri-state) ; Pin 12 (RX/SDI) is typed as input; it is a multiplexed UART RX/SPI DIN pin, and the datasheet gives ; The datasheet's pin table gives the VT pin no explicit voltage limit in the pin table; the VDD/2 max"
        ],
        "pages_sent": 31,
        "cost_usd": 0.0808,
        "at": "2026-10-21T06:26:05"
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        "sha256": "da8e25f05d4e5f65",
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      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 14,
        "described": 14,
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  "metadata": {
    "specs": {
      "Manufacturer": "BL(Shanghai Belling)",
      "Package": "TSSOP-14",
      "Category": "Data Converters",
      "Pins": "14"
    },
    "characteristics": {
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          "max": 3.6,
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          "unit": "mS",
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          "symbol": "",
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        {
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          "symbol": "",
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        {
          "name": "电源电压 (absolute)",
          "symbol": "VDD",
          "kind": "absolute_maximum",
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          "min": -0.3,
          "typ": null,
          "max": 4,
          "conditions": "T = 25 ℃",
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        {
          "name": "模拟输入电压（相对于 GND）IP1、VP",
          "symbol": "",
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          "unit": "V",
          "min": -4,
          "typ": null,
          "max": 4,
          "conditions": "T = 25 ℃",
          "source_page": 12,
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        },
        {
          "name": "数字输入电压（相对于 GND）UART_SEL, RX/SDI",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
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          "max": null,
          "conditions": "T = 25 ℃",
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        {
          "name": "数字输出电压（相对于 GND）CF, TX/SDO",
          "symbol": "",
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          "min": -0.3,
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          "conditions": "T = 25 ℃",
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        {
          "name": "工作温度",
          "symbol": "Topr",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "T = 25 ℃ (table header)",
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        {
          "name": "贮藏温度",
          "symbol": "Tstr",
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          "unit": "℃",
          "min": -55,
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          "max": 150,
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          "source_page": 12,
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        {
          "name": "功耗",
          "symbol": "Iop",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 3,
          "max": null,
          "conditions": "VDD=3.3V",
          "source_page": 11,
          "source": "datasheet"
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          "name": "有功电能测量精度（大信号）",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
          "typ": 0.2,
          "max": null,
          "conditions": "35A~100mA 输入@ 1mohm 采样电阻",
          "source_page": 11,
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          "name": "有功电能测量精度（小信号）",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
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          "max": null,
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          "source_page": 11,
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          "name": "有功电能测量精度（微小信号）",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
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          "max": null,
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          "source_page": 11,
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          "name": "有效值测量精度（大信号）",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
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          "max": null,
          "conditions": "35A~100mA 输入@ 1mohm 采样电阻",
          "source_page": 11,
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          "name": "有效值测量精度（小信号）",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
          "typ": 2,
          "max": null,
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          "name": "有效值测量精度（微小信号）",
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          "unit": "%",
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        {
          "name": "过零信号输出延时",
          "symbol": "",
          "kind": "electrical",
          "unit": "uS",
          "min": null,
          "typ": 571,
          "max": null,
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        {
          "name": "通道间相角引起测量误差（容性）",
          "symbol": "PF08err",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
          "typ": 0.5,
          "max": null,
          "conditions": "相位超前 37 （PF=0.8）",
          "source_page": 11,
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        {
          "name": "通道间相角引起测量误差（感性）",
          "symbol": "PF05err",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
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          "max": null,
          "conditions": "相位滞后 60 （PF=0.5）",
          "source_page": 11,
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        {
          "name": "AC 电源抑制（输出频率幅度变化）",
          "symbol": "ACPSRR",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.1,
          "max": null,
          "conditions": "IP/N=100mV",
          "source_page": 11,
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        {
          "name": "DC 电源抑制（输出频率幅度变化）",
          "symbol": "DCPSRR",
          "kind": "electrical",
          "unit": "%",
          "min": null,
          "typ": 0.1,
          "max": null,
          "conditions": "VP/N=100mV",
          "source_page": 11,
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        {
          "name": "模拟输入电平（电流）",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 50,
          "max": null,
          "conditions": "电流差分输入（峰值）",
          "source_page": 12,
          "source": "datasheet"
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        {
          "name": "模拟输入电平（电压）",
          "symbol": "",
          "kind": "electrical",
          "unit": "mV",
          "min": null,
          "typ": 200,
          "max": null,
          "conditions": "电压差分输入（峰值）",
          "source_page": 12,
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          "name": "模拟输入阻抗",
          "symbol": "",
          "kind": "electrical",
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          "min": null,
          "typ": 370,
          "max": null,
          "conditions": "",
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        {
          "name": "SEL 下拉电阻",
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          "kind": "electrical",
          "unit": "kΩ",
          "min": null,
          "typ": 56.9,
          "max": null,
          "conditions": "",
          "source_page": 12,
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        {
          "name": "模拟输入带宽（-3dB）",
          "symbol": "",
          "kind": "electrical",
          "unit": "kHz",
          "min": null,
          "typ": 3.5,
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          "source_page": 12,
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          "name": "内部电压基准",
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          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.218,
          "max": null,
          "conditions": "",
          "source_page": 12,
          "source": "datasheet"
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