DS3231

{
  "schema_version": 1,
  "type": "component",
  "slug": "ds3231",
  "title": "DS3231",
  "brief": "Analog Devices I2C real-time clock with TCXO, SOIC-16W. ±2 ppm, battery backup, dual alarms, 32 kHz out. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "rtc",
    "real-time-clock",
    "i2c",
    "soic-16",
    "analog-devices"
  ],
  "component": {
    "mpn": "DS3231",
    "manufacturer": "Analog Devices",
    "package": "SOIC-16W (300-mil)",
    "pin_count": 16,
    "category": "Clock IC",
    "subcategory": "Real-time clock (RTC)",
    "datasheet": "https://www.elecrow.com/download/DS3231.pdf",
    "parts": {
      "symbol": "ds3231.kicad_sym",
      "footprint": "ds3231.kicad_mod",
      "model_3d": "ds3231-etched.glb",
      "model_3d_plain": "ds3231.glb",
      "lbr": "ds3231.lbr",
      "model_3d_step": "ds3231-etched.step",
      "model_3d_step_plain": "ds3231.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "32kHz",
        "type": "output",
        "description": "32.768kHz output. Open-drain; requires an external pullup resistor (to VCC or VBAT, up to 5.5V). May be left open if not used. Enabled via the EN32kHz bit in the status register."
      },
      {
        "number": "2",
        "name": "VCC",
        "type": "power_in",
        "description": "DC power pin for primary supply (2.3V to 5.5V, typ 3.3V). Decouple with a 0.1µF to 1.0µF capacitor. If not used, connect to ground."
      },
      {
        "number": "3",
        "name": "INT/SQW",
        "type": "output",
        "description": "Active-low interrupt or square-wave output. Open-drain; requires an external pullup resistor. Function is selected by the INTCN bit in the Control Register (0Eh): INTCN=0 outputs a square wave at frequency set by RS1/RS2, INTCN=1 asserts on an alarm match. May be left open if not used."
      },
      {
        "number": "4",
        "name": "RST",
        "type": "bidirectional",
        "description": "Active-low reset input/output. Open-drain with internal ~50kΩ pullup to VCC. Driven low when VCC falls below VPF (power-fail); also accepts a debounced pushbutton input to ground for external reset request. Leave open or add a pushbutton switch to GND if not used."
      },
      {
        "number": "5",
        "name": "N.C.",
        "type": "unconnected",
        "description": "No connection. Must be connected to ground per datasheet."
      },
      {
        "number": "6",
        "name": "N.C.",
        "type": "unconnected",
        "description": "No connection. Must be connected to ground per datasheet."
      },
      {
        "number": "7",
        "name": "N.C.",
        "type": "unconnected",
        "description": "No connection. Must be connected to ground per datasheet."
      },
      {
        "number": "8",
        "name": "N.C.",
        "type": "unconnected",
        "description": "No connection. Must be connected to ground per datasheet."
      },
      {
        "number": "9",
        "name": "N.C.",
        "type": "unconnected",
        "description": "No connection. Must be connected to ground per datasheet."
      },
      {
        "number": "10",
        "name": "N.C.",
        "type": "unconnected",
        "description": "No connection. Must be connected to ground per datasheet."
      },
      {
        "number": "11",
        "name": "N.C.",
        "type": "unconnected",
        "description": "No connection. Must be connected to ground per datasheet."
      },
      {
        "number": "12",
        "name": "N.C.",
        "type": "unconnected",
        "description": "No connection. Must be connected to ground per datasheet."
      },
      {
        "number": "13",
        "name": "GND",
        "type": "power_in",
        "description": "Device ground reference. Substrate is connected to ground."
      },
      {
        "number": "14",
        "name": "VBAT",
        "type": "power_in",
        "description": "Backup power-supply input (2.3V to 5.5V, typ 3.0V). Decouple with a 0.1µF to 1.0µF low-leakage capacitor. If not used, connect to ground. UL-recognized against reverse charging when used with a lithium battery."
      },
      {
        "number": "15",
        "name": "SDA",
        "type": "bidirectional",
        "description": "I2C serial data input/output. Open-drain; requires an external pullup resistor. Supports Fast-mode (400kHz) I2C."
      },
      {
        "number": "16",
        "name": "SCL",
        "type": "input",
        "description": "I2C serial clock input. Used to synchronize data on the serial interface. Supports Fast-mode (400kHz) I2C."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.elecrow.com/download/DS3231.pdf",
        "pages": 19,
        "sha256": "dedc8cb80681a2eb",
        "source_tier": "cse"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 16,
        "described": 16,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    }
  },
  "metadata": {
    "specs": {
      "Type": "I2C real-time clock (TCXO)",
      "Accuracy": "±2 ppm (0 to +40 °C)",
      "Timekeeping": "s/min/hr/day/date/month/year to 2100",
      "Alarms": "Two programmable time-of-day",
      "Outputs": "32.768 kHz + INT/SQW (open-drain)",
      "Temperature sensor": "±3 °C digital",
      "Supply (VCC)": "2.3-5.5 V (typ 3.3 V)",
      "Backup (VBAT)": "2.3-5.5 V (typ 3.0 V)",
      "Package": "SOIC-16W (300-mil)",
      "Body (L×W×H)": "10.3 × 7.5 × 2.67 mm"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "ds3231",
    "i2c real-time clock",
    "rtc with tcxo",
    "accurate rtc module"
  ],
  "discovery_pitch": "DS3231 extremely accurate I2C real-time clock with integrated TCXO (SOIC-16W) with datasheet-verified pinout, KiCad symbol/footprint/3D, and full provenance.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ds3231.kicad_sym",
    "ds3231.kicad_mod",
    "ds3231.glb",
    "ds3231.lbr",
    "docs/hero.png",
    "docs/ds3231-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ds3231-etched.step"
  ],
  "variants": [
    {
      "mpn": "DS3231SN# (SOIC-16W, industrial)",
      "kind": "packaging"
    },
    {
      "mpn": "DS3231S# (SOIC-16W, commercial)",
      "kind": "packaging"
    }
  ]
}