HTM1628

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  "type": "component",
  "slug": "htm1628",
  "title": "HTM1628",
  "brief": "TDSEMIC LED Drivers, SSOP-28. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
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    "led drivers",
    "htm1628",
    "factory-2.0.0",
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  "component": {
    "mpn": "HTM1628",
    "manufacturer": "TDSEMIC",
    "package": "SSOP-28",
    "pin_count": 28,
    "category": "LED Drivers",
    "subcategory": "LED Drivers",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/3c5aa34d6c3982e3e5c7ae5c058fda16.pdf",
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    "distributor_links": {
      "lcsc": "C46683632"
    },
    "distributor_check": {
      "checked_at": "2026-10-21T20:10:47Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
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      "mouser": {
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    "pins": [
      {
        "number": "1",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect; leave floating per datasheet."
      },
      {
        "number": "2",
        "name": "DI/O",
        "type": "bidirectional",
        "description": "3-wire serial data input/output; VIH ≥ 0.7 VDD, VIL ≤ 0.2 VDD, input leakage ≤ ±1 µA; outputs key data on read cycles."
      },
      {
        "number": "3",
        "name": "CLK",
        "type": "input",
        "description": "Serial clock input; fmax 1 MHz, clock pulse width ≥ 400 ns; data latched on rising edge."
      },
      {
        "number": "4",
        "name": "STB",
        "type": "input",
        "description": "Chip-select (strobe) input, active-low to start serial transfer; pulse width ≥ 1 µs; driving STB high mid-transfer aborts the command."
      },
      {
        "number": "5",
        "name": "K1",
        "type": "input",
        "description": "Key-scan matrix row input 1; internal 10 kΩ (typ.) pull-down resistor; sampled once per display scan cycle (~3.12 ms)."
      },
      {
        "number": "6",
        "name": "K2",
        "type": "input",
        "description": "Key-scan matrix row input 2; internal 10 kΩ (typ.) pull-down resistor; sampled once per display scan cycle (~3.12 ms)."
      },
      {
        "number": "7",
        "name": "VDD",
        "type": "power_in",
        "description": "Supply voltage; 2.8 V - 5.5 V (abs. max −0.5 V to +7.0 V); quiescent current 200 µA typ. with no load at VDD = 5 V."
      },
      {
        "number": "8",
        "name": "SEG1/KS1",
        "type": "output",
        "description": "Segment 1 / key-scan column 1 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V."
      },
      {
        "number": "9",
        "name": "SEG2/KS2",
        "type": "output",
        "description": "Segment 2 / key-scan column 2 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V."
      },
      {
        "number": "10",
        "name": "SEG3/KS3",
        "type": "output",
        "description": "Segment 3 / key-scan column 3 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V."
      },
      {
        "number": "11",
        "name": "SEG4/KS4",
        "type": "output",
        "description": "Segment 4 / key-scan column 4 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V."
      },
      {
        "number": "12",
        "name": "SEG5/KS5",
        "type": "output",
        "description": "Segment 5 / key-scan column 5 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V."
      },
      {
        "number": "13",
        "name": "SEG6/KS6",
        "type": "output",
        "description": "Segment 6 / key-scan column 6 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V."
      },
      {
        "number": "14",
        "name": "SEG7/KS7",
        "type": "output",
        "description": "Segment 7 / key-scan column 7 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V."
      },
      {
        "number": "15",
        "name": "SEG8/KS8",
        "type": "output",
        "description": "Segment 8 / key-scan column 8 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V."
      },
      {
        "number": "16",
        "name": "SEG9/KS9",
        "type": "output",
        "description": "Segment 9 / key-scan column 9 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V."
      },
      {
        "number": "17",
        "name": "SEG10/KS10",
        "type": "output",
        "description": "Segment 10 / key-scan column 10 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V."
      },
      {
        "number": "18",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; supply return, placed adjacent to SEG/GRID multiplex outputs to minimise impedance."
      },
      {
        "number": "19",
        "name": "SEG12/GRID7",
        "type": "output",
        "description": "Segment 12 / grid 7 multiplex output; P-type open-drain in segment mode, N-type open-drain in grid mode; supports both SEG and GRID drive."
      },
      {
        "number": "20",
        "name": "SEG13/GRID6",
        "type": "output",
        "description": "Segment 13 / grid 6 multiplex output; P-type open-drain in segment mode, N-type open-drain in grid mode."
      },
      {
        "number": "21",
        "name": "SEG14/GRID5",
        "type": "output",
        "description": "Segment 14 / grid 5 multiplex output; P-type open-drain in segment mode, N-type open-drain in grid mode."
      },
      {
        "number": "22",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; supply return, placed between multiplex outputs and GRID outputs."
      },
      {
        "number": "23",
        "name": "GRID4",
        "type": "output",
        "description": "Grid (digit select) 4 output; N-type open-drain; IOL 80 mA min, 100 mA typ. at VO = 0.31 V."
      },
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        "number": "24",
        "name": "GRID3",
        "type": "output",
        "description": "Grid (digit select) 3 output; N-type open-drain; IOL 80 mA min, 100 mA typ. at VO = 0.31 V."
      },
      {
        "number": "25",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; supply return, placed between GRID4/GRID3 and GRID2/GRID1 pins."
      },
      {
        "number": "26",
        "name": "GRID2",
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        "description": "Grid (digit select) 2 output; N-type open-drain; IOL 80 mA min, 100 mA typ. at VO = 0.31 V."
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        "number": "27",
        "name": "GRID1",
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      },
      {
        "number": "28",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; supply return, placed at package corner adjacent to GRID1."
      }
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    "specs": {
      "Manufacturer": "TDSEMIC",
      "Package": "SSOP-28",
      "Category": "LED Drivers",
      "Pins": "28"
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          "name": "逻辑输入电压 (logic input voltage)",
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          "name": "输出高电平驱动 (SEG) (output high-level drive)",
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          "name": "ESD 静电 (HBM)",
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          "name": "输出高电平驱动 (output high-level drive)",
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          "kind": "electrical",
          "unit": "mA",
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          "name": "输出高电平驱动 (output high-level drive)",
          "symbol": "IOH2",
          "kind": "electrical",
          "unit": "mA",
          "min": -20,
          "typ": -30,
          "max": -50,
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          "name": "输出低电平驱动 (output low-level drive)",
          "symbol": "IOL",
          "kind": "electrical",
          "unit": "mA",
          "min": 80,
          "typ": 100,
          "max": null,
          "conditions": "GRID1～GRID8, VO=0.3V; VDD=5V",
          "source_page": 7,
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          "name": "输出电流 (DOUT output current)",
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          "kind": "electrical",
          "unit": "mA",
          "min": 4,
          "typ": 8,
          "max": null,
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          "source_page": 7,
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        },
        {
          "name": "高电平输出电流容许量 (high-level output current tolerance)",
          "symbol": "ITOLSG",
          "kind": "tolerance",
          "unit": "%",
          "min": null,
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          "source_page": 7,
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          "name": "滞后电压 (hysteresis voltage)",
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          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.35,
          "max": null,
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          "source_page": 7,
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          "name": "输入漏电流 (input leakage current)",
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          "typ": null,
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          "conditions": "VIN=VDD/GND, STB, CLK, DIN/DIO; VDD=5V",
          "source_page": 7,
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          "name": "静态电流 (quiescent current)",
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          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 200,
          "max": null,
          "conditions": "no load, VIN=VDD; VDD=5V",
          "source_page": 7,
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          "name": "输入下拉电阻 (input pull-down resistance)",
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          "kind": "electrical",
          "unit": "kΩ",
          "min": null,
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          "conditions": "K0~K3",
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          "name": "振荡频率 (oscillation frequency)",
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          "kind": "timing",
          "unit": "kHz",
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          "name": "时钟脉冲宽度 (clock pulse width)",
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          "name": "数据建立时间 (data setup time)",
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          "kind": "timing",
          "unit": "ns",
          "min": 100,
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          "name": "等待时间 (wait time)",
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          "conditions": "CLK↑→CLK↓; VDD=4.5～5.5V",
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