CH452A

{
  "schema_version": 1,
  "type": "component",
  "slug": "ch452a",
  "title": "CH452A",
  "brief": "WCH Jiangsu Qin Heng Digital Tube Drivers, SOIC-28-300mil. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "led drivers",
    "ch452a"
  ],
  "component": {
    "mpn": "CH452A",
    "manufacturer": "WCH Jiangsu Qin Heng",
    "package": "SOIC-28-300mil",
    "pin_count": 28,
    "category": "LED Drivers",
    "subcategory": "Digital Tube Drivers",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618866980522766336",
    "parts": {
      "symbol": "ch452a.kicad_sym",
      "footprint": "ch452a.kicad_mod",
      "model_3d": "ch452a-etched.glb",
      "model_3d_plain": "ch452a.glb",
      "model_3d_step": "ch452a-etched.step",
      "model_3d_step_plain": "ch452a.step",
      "lbr": "ch452a.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "DIG7",
        "type": "output",
        "description": "Word drive output 7 for LED nixie tube (active low, ~4x25 mA sink). Also used as column-scan output during keyboard scan. DIG6/DIG7 can be reused as GPO universal outputs."
      },
      {
        "number": "2",
        "name": "DIG6",
        "type": "output",
        "description": "Word drive output 6 for LED nixie tube (active low). Also used as column-scan output during keyboard scan and can be reused as GPO."
      },
      {
        "number": "3",
        "name": "DIG5",
        "type": "output",
        "description": "Word drive output 5 for LED nixie tube (active low). Also used as column-scan output during keyboard scan."
      },
      {
        "number": "4",
        "name": "DIG4",
        "type": "output",
        "description": "Word drive output 4 for LED nixie tube (active low). Also used as column-scan output during keyboard scan."
      },
      {
        "number": "5",
        "name": "DIG3",
        "type": "output",
        "description": "Word drive output 3 for LED nixie tube (active low). Also used as column-scan output during keyboard scan."
      },
      {
        "number": "6",
        "name": "DIG2",
        "type": "output",
        "description": "Word drive output 2 for LED nixie tube (active low). Also used as column-scan output during keyboard scan."
      },
      {
        "number": "7",
        "name": "DIG1",
        "type": "output",
        "description": "Word drive output 1 for LED nixie tube (active low). Also used as column-scan output during keyboard scan."
      },
      {
        "number": "8",
        "name": "DIG0",
        "type": "output",
        "description": "Word drive output 0 for LED nixie tube (active low). Also used as column-scan output during keyboard scan."
      },
      {
        "number": "9",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground. Continuous current not less than 150 mA."
      },
      {
        "number": "10",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground. Continuous current not less than 150 mA."
      },
      {
        "number": "11",
        "name": "NC/GPI",
        "type": "input",
        "description": "No connection or general-purpose input; state reported in bit 7 of the returned key code."
      },
      {
        "number": "12",
        "name": "RST",
        "type": "output",
        "description": "Power-on reset output, active high. Can be tied to the host MCU reset input."
      },
      {
        "number": "13",
        "name": "RST#",
        "type": "output",
        "description": "Power-on reset output, active low. Complementary to RST for MCUs needing active-low reset."
      },
      {
        "number": "14",
        "name": "H3L2",
        "type": "input",
        "description": "Serial interface mode select with built-in pull-up. High selects the 4-wire serial interface; low selects the 2-wire (I2C-like) serial interface."
      },
      {
        "number": "15",
        "name": "SEG0",
        "type": "bidirectional",
        "description": "Segment drive 0 (active high, ~20 mA source) for LED nixie tube segment A; also acts as keyboard scan input (active high) with built-in pull-down resistor."
      },
      {
        "number": "16",
        "name": "SEG1",
        "type": "bidirectional",
        "description": "Segment drive 1 (active high) for segment B; also keyboard scan input with built-in pull-down."
      },
      {
        "number": "17",
        "name": "SEG2",
        "type": "bidirectional",
        "description": "Segment drive 2 (active high) for segment C; also keyboard scan input with built-in pull-down."
      },
      {
        "number": "18",
        "name": "SEG3",
        "type": "bidirectional",
        "description": "Segment drive 3 (active high) for segment D; also keyboard scan input with built-in pull-down."
      },
      {
        "number": "19",
        "name": "SEG4",
        "type": "bidirectional",
        "description": "Segment drive 4 (active high) for segment E; also keyboard scan input with built-in pull-down."
      },
      {
        "number": "20",
        "name": "SEG5",
        "type": "bidirectional",
        "description": "Segment drive 5 (active high) for segment F; also keyboard scan input with built-in pull-down."
      },
      {
        "number": "21",
        "name": "SEG6",
        "type": "bidirectional",
        "description": "Segment drive 6 (active high) for segment G; also keyboard scan input with built-in pull-down."
      },
      {
        "number": "22",
        "name": "SEG7",
        "type": "bidirectional",
        "description": "Segment drive 7 (active high) for the decimal point of the LED nixie tube; also keyboard scan input with built-in pull-down."
      },
      {
        "number": "23",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive power supply, 3V-5V. Continuous current not less than 150 mA. Requires 0.1 uF ceramic and >=100 uF electrolytic decoupling capacitors close to the pin."
      },
      {
        "number": "24",
        "name": "DOUT/INT#",
        "type": "output",
        "description": "In 4-wire mode: serial data output DOUT (built-in pull-up, open-drain); also serves as keyboard interrupt output, active low. In 2-wire mode: interrupt output INT# (built-in pull-up, open-drain), keyboard interrupt active low."
      },
      {
        "number": "25",
        "name": "LOAD/ADDR",
        "type": "input",
        "description": "In 4-wire mode: serial data load strobe LOAD (built-in pull-up). In 2-wire mode: address selection ADDR (built-in pull-up) for parallel-connecting two CH452 chips on the same bus."
      },
      {
        "number": "26",
        "name": "DIN/SDA",
        "type": "bidirectional",
        "description": "In 4-wire mode: serial data input DIN (built-in pull-up). In 2-wire mode: serial data line SDA (semi-bidirectional, open-drain output plus input, built-in pull-up); I2C-compatible 400 kHz."
      },
      {
        "number": "27",
        "name": "DCLK/SCL",
        "type": "input",
        "description": "In 4-wire mode: serial data clock DCLK (built-in pull-up, up to 10 MHz shift / spec limit 2 MHz for cascade). In 2-wire mode: serial clock SCL (built-in pull-up, 400 kHz I2C-compatible)."
      },
      {
        "number": "28",
        "name": "RSTI",
        "type": "input",
        "description": "Manual reset input, active high, with built-in pull-down resistor. Drives the internal reset and the RST/RST# outputs."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618866980522766336",
        "pages": 30,
        "sha256": "9bca8400a8383cac",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 28,
        "described": 28,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ch452a.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          10.3,
          17.9,
          2.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "b889a13dbe9ec59e79fa9f1b5118b00bfa54f9582392335ff3365b64afc264b1",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ch452a-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          10.3,
          17.9,
          2.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "e39568067cd1a9a12477e4359d75724499ae922980b0f21ce89f29d1c8e0a114",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "WCH Jiangsu Qin Heng",
      "Package": "SOIC-28-300mil",
      "Category": "LED Drivers",
      "Pins": "28"
    }
  },
  "variants": [
    {
      "mpn": "CH452A",
      "kind": "packaging"
    },
    {
      "mpn": "CH452L",
      "kind": "unknown"
    }
  ],
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ch452a"
  ],
  "discovery_pitch": "CH452A (WCH Jiangsu Qin Heng) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ch452a.kicad_sym",
    "ch452a.kicad_mod",
    "ch452a.glb",
    "ch452a.step",
    "ch452a.lbr",
    "docs/hero.png",
    "docs/ch452a-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T19:02:32.210Z"
}