PCF8575 16-Bit I2C I/O Expander

{
  "schema_version": 1,
  "type": "component",
  "slug": "pcf8575",
  "title": "PCF8575 16-Bit I2C I/O Expander",
  "brief": "16-bit quasi-bidirectional I/O expander over I2C with an interrupt output.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "gpio-expander",
    "i2c",
    "io-expander",
    "16-bit",
    "interrupt",
    "ti",
    "ssop-24"
  ],
  "component": {
    "mpn": "PCF8575",
    "manufacturer": "Texas Instruments",
    "package": "SSOP-24",
    "pin_count": 24,
    "category": "Interface",
    "subcategory": "I/O Expander",
    "datasheet": "https://www.ti.com/lit/ds/symlink/pcf8575.pdf",
    "parts": {
      "symbol": "pcf8575.kicad_sym",
      "footprint": "pcf8575.kicad_mod",
      "model_3d": "pcf8575-etched.glb",
      "model_3d_plain": "pcf8575.glb",
      "model_3d_step": "pcf8575-etched.step",
      "model_3d_step_plain": "pcf8575.step",
      "lbr": "pcf8575.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "INT",
        "type": "output",
        "description": "Interrupt output (active-low, open-drain). Connect to VCC through a pull-up resistor. Asserts when any P-port input changes state."
      },
      {
        "number": "2",
        "name": "A1",
        "type": "input",
        "description": "I2C hardware address input 1. Connect directly to VCC or ground; pull-up resistors are not needed. Combined with A0/A2 to give up to eight unique bus addresses."
      },
      {
        "number": "3",
        "name": "A2",
        "type": "input",
        "description": "I2C hardware address input 2. Connect directly to VCC or ground; pull-up resistors are not needed."
      },
      {
        "number": "4",
        "name": "P00",
        "type": "bidirectional",
        "description": "P-port 0, bit 0. Quasi-bidirectional I/O with push-pull design structure; latched outputs with high-current drive for LEDs. IOL up to 25 mA, IOH transient pullup ~-10 mA."
      },
      {
        "number": "5",
        "name": "P01",
        "type": "bidirectional",
        "description": "P-port 0, bit 1. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "6",
        "name": "P02",
        "type": "bidirectional",
        "description": "P-port 0, bit 2. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "7",
        "name": "P03",
        "type": "bidirectional",
        "description": "P-port 0, bit 3. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "8",
        "name": "P04",
        "type": "bidirectional",
        "description": "P-port 0, bit 4. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "9",
        "name": "P05",
        "type": "bidirectional",
        "description": "P-port 0, bit 5. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "10",
        "name": "P06",
        "type": "bidirectional",
        "description": "P-port 0, bit 6. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "11",
        "name": "P07",
        "type": "bidirectional",
        "description": "P-port 0, bit 7. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "12",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device."
      },
      {
        "number": "13",
        "name": "P10",
        "type": "bidirectional",
        "description": "P-port 1, bit 0. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "14",
        "name": "P11",
        "type": "bidirectional",
        "description": "P-port 1, bit 1. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "15",
        "name": "P12",
        "type": "bidirectional",
        "description": "P-port 1, bit 2. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "16",
        "name": "P13",
        "type": "bidirectional",
        "description": "P-port 1, bit 3. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "17",
        "name": "P14",
        "type": "bidirectional",
        "description": "P-port 1, bit 4. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "18",
        "name": "P15",
        "type": "bidirectional",
        "description": "P-port 1, bit 5. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "19",
        "name": "P16",
        "type": "bidirectional",
        "description": "P-port 1, bit 6. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "20",
        "name": "P17",
        "type": "bidirectional",
        "description": "P-port 1, bit 7. Quasi-bidirectional I/O with push-pull design structure."
      },
      {
        "number": "21",
        "name": "A0",
        "type": "input",
        "description": "I2C hardware address input 0. Connect directly to VCC or ground; pull-up resistors are not needed."
      },
      {
        "number": "22",
        "name": "SCL",
        "type": "input",
        "description": "I2C serial clock line. Connect to VCC through a pull-up resistor. Supports up to 400 kHz (Fast-mode I2C)."
      },
      {
        "number": "23",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C serial data line (open-drain). Connect to VCC through a pull-up resistor."
      },
      {
        "number": "24",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage input. Recommended operating range 2.5 V to 5.5 V (absolute max 6.5 V). Bypass with a decoupling capacitor to GND."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/pcf8575.pdf",
        "pages": 44,
        "sha256": "c9a02501bf10ed80",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 24,
        "described": 24,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "pcf8575.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          8.7,
          1.65
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "9e0654855743c5437aa9f4979b47c0dc621f54be5ccb6b51a2f0a01b2ec9981f",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "pcf8575-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          8.7,
          1.65
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        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "ca923b707c19f9d7676ed9dfb9067a4c7bb9dc23ac922772c046facf2474ac48",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "16-bit I2C I/O expander",
      "I/O": "16, quasi-bidirectional (2 ports)",
      "Interface": "I2C (up to 400 kHz)",
      "Interrupt": "Open-drain, on input change",
      "Addressing": "3 hardware address pins (up to 8)",
      "Supply voltage": "2.5 V to 5.5 V",
      "Operating temperature": "-40 C to 85 C"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "I2C GPIO expander",
    "add more I/O",
    "16-bit I/O over I2C",
    "port expander"
  ],
  "discovery_pitch": "Add 16 general-purpose I/O pins to an MCU over I2C, with an interrupt output on any input change.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "pcf8575.kicad_sym",
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    "pcf8575.lbr",
    "docs/hero.png",
    "docs/pcf8575-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
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  "variants": [
    {
      "mpn": "PCF8575DB",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575DBR",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575DBQ",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575DBQR",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575DGV",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575DGVR",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575DW",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575DWR",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575PW",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575PWR",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575RGE",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575RGER",
      "kind": "unknown"
    },
    {
      "mpn": "PCF8575RGET",
      "kind": "unknown"
    }
  ]
}