PCA9536

{
  "schema_version": 1,
  "type": "component",
  "slug": "pca9536",
  "title": "PCA9536",
  "brief": "TI 4-bit I2C/SMBus I/O expander, SOIC-8. Four configurable I/O pins on a fixed I2C address, 2.3-5.5 V. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "io-expander",
    "gpio-expander",
    "i2c",
    "soic-8",
    "texas-instruments"
  ],
  "component": {
    "mpn": "PCA9536",
    "manufacturer": "Texas Instruments",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Interface",
    "subcategory": "I2C I/O expander",
    "datasheet": "https://www.ti.com/lit/ds/symlink/pca9536.pdf",
    "parts": {
      "symbol": "pca9536.kicad_sym",
      "footprint": "pca9536.kicad_mod",
      "model_3d": "pca9536-etched.glb",
      "model_3d_plain": "pca9536.glb",
      "model_3d_step": "pca9536-etched.step",
      "model_3d_step_plain": "pca9536.step",
      "lbr": "pca9536.lbr"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "P0",
        "type": "bidirectional",
        "description": "P-port bit 0. Push-pull bidirectional I/O; configurable as input or output via the Configuration register. Powers up as an input with a weak pull-up to VCC. High-current drive (up to ~25 mA sink) sufficient for direct LED drive."
      },
      {
        "number": "2",
        "name": "P1",
        "type": "bidirectional",
        "description": "P-port bit 1. Push-pull bidirectional I/O; configurable as input or output via the Configuration register. Powers up as an input with a weak pull-up to VCC."
      },
      {
        "number": "3",
        "name": "P2",
        "type": "bidirectional",
        "description": "P-port bit 2. Push-pull bidirectional I/O; configurable as input or output via the Configuration register. Powers up as an input with a weak pull-up to VCC."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground return. Connect to the system ground plane."
      },
      {
        "number": "5",
        "name": "P3",
        "type": "bidirectional",
        "description": "P-port bit 3. Push-pull bidirectional I/O; configurable as input or output via the Configuration register. Powers up as an input with a weak pull-up to VCC."
      },
      {
        "number": "6",
        "name": "SCL",
        "type": "input",
        "description": "I2C serial clock input. Open-drain bus line; connect to VCC through an external pull-up resistor. Supports standard mode (100 kHz) and fast mode (400 kHz)."
      },
      {
        "number": "7",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C serial data line. Open-drain bidirectional bus; connect to VCC through an external pull-up resistor."
      },
      {
        "number": "8",
        "name": "VCC",
        "type": "power_in",
        "description": "Supply voltage input, 2.3 V to 5.5 V. Bypass locally with a ceramic decoupling capacitor to GND."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.ti.com/lit/ds/symlink/pca9536.pdf",
        "pages": 35,
        "sha256": "bc9e7a06865817ab",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "pca9536.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "07f46cff378d30e6c27dfd5a03092c795323f86d91c71fc7e743f4f418dc553a",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "pca9536-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6,
          4.9,
          1.75
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "e90b8a646706645738c7099134f4014d56401aac3faeb8f9b1b3630e195d66cd",
        "checked": "2026-11-03",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "4-bit I2C / SMBus I/O expander",
      "Interface": "I2C / SMBus (fixed address)",
      "I/O": "4 pins (P0-P3), each input or output",
      "Supply": "2.3-5.5 V",
      "Bus speed": "Up to 400 kHz",
      "Default": "All I/O as inputs at power-on",
      "Package": "SOIC-8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "pca9536",
    "4-bit io expander",
    "i2c gpio expander",
    "add gpio over i2c"
  ],
  "discovery_pitch": "TI PCA9536 4-bit I2C I/O expander (SOIC-8) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "pca9536.kicad_sym",
    "pca9536.kicad_mod",
    "pca9536.glb",
    "pca9536.step",
    "pca9536.lbr",
    "docs/hero.png",
    "docs/pca9536-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "pca9536-etched.step"
  ],
  "variants": [
    {
      "mpn": "PCA9536D (SOIC-8, tube)",
      "kind": "packaging"
    },
    {
      "mpn": "PCA9536DR (SOIC-8, tape & reel)",
      "kind": "packaging"
    },
    {
      "mpn": "PCA9536DGKR (VSSOP-8)",
      "kind": "packaging"
    }
  ]
}