GM1302

{
  "schema_version": 1,
  "type": "component",
  "slug": "gm1302",
  "title": "GM1302",
  "brief": "GATEMODE Real-time Clocks (RTC), SOIC-8. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.2.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "rtc",
    "gm1302"
  ],
  "component": {
    "mpn": "GM1302",
    "manufacturer": "GATEMODE",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "RTC",
    "subcategory": "Real-time Clocks (RTC)",
    "datasheet": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2303141530_GATEMODE-GM1302_C2845166.pdf",
    "parts": {
      "symbol": "gm1302.kicad_sym",
      "footprint": "gm1302.kicad_mod",
      "model_3d": "gm1302-etched.glb",
      "model_3d_plain": "gm1302.glb",
      "model_3d_step": "gm1302-etched.step",
      "model_3d_step_plain": "gm1302.step",
      "lbr": "gm1302.lbr"
    },
    "distributor_links": {
      "lcsc": "C2845166"
    },
    "pins": [
      {
        "number": "1",
        "name": "Vcc2",
        "type": "power_in",
        "description": "Primary supply pin in a dual-supply system. GM1302 is powered by whichever of Vcc1/Vcc2 is higher: when Vcc2 > Vcc1 + 0.2V, GM1302 draws from Vcc2; when Vcc2 + 0.2V < Vcc1, it draws from Vcc1. Recommended operating range 2.0-5.5V."
      },
      {
        "number": "2",
        "name": "X1",
        "type": "input",
        "description": "Oscillator input; connect an external 32.768 kHz crystal between X1 and X2 (specified crystal load capacitance CL = 6pF). Internal oscillator capacitance is integrated."
      },
      {
        "number": "3",
        "name": "X2",
        "type": "output",
        "description": "Oscillator output; connect to the external 32.768 kHz crystal along with X1."
      },
      {
        "number": "4",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference for the device. All voltages are referenced to GND."
      },
      {
        "number": "5",
        "name": "RST",
        "type": "input",
        "description": "Reset / chip-enable input. Must be driven HIGH during any read/write to initiate a data transfer; driving it low terminates a transfer and places I/O in high-impedance. Contains an internal 40kΩ (typ) pull-down to ground. On power-up RST must be held logic 0 until Vcc ≥ 2.5V."
      },
      {
        "number": "6",
        "name": "I/O",
        "type": "bidirectional",
        "description": "Bidirectional serial data pin for the 3-wire interface (command/address in, data in/out). Contains an internal 40kΩ (typ) pull-down to ground. Goes high-impedance when RST is low or between output bits per SCLK rising edge. I/O capacitance C_I/O typ. 15 pF."
      },
      {
        "number": "7",
        "name": "SCLK",
        "type": "input",
        "description": "Serial clock input for the 3-wire interface; synchronizes data transfers on the I/O pin. Data in is latched on the rising edge, data out is driven on the falling edge. Contains an internal 40kΩ (typ) pull-down. Max SCLK frequency 2 MHz at Vcc = 5V (0.5 MHz at Vcc = 2V)."
      },
      {
        "number": "8",
        "name": "Vcc1",
        "type": "power_in",
        "description": "Backup supply pin. In a single-supply-with-battery system Vcc1 provides low-power operation and low-power battery backup; it can source the device (and be trickle-charged from Vcc2 through the programmable trickle-charge network) when the main Vcc2 supply is absent."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://wmsc.lcsc.com/wmsc/upload/file/pdf/v2/lcsc/2303141530_GATEMODE-GM1302_C2845166.pdf",
        "pages": 11,
        "sha256": "3214ee6475dc55db",
        "source_tier": "lcsc"
      },
      "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"
    },
    "pin1": {
      "pad": "1",
      "at": [
        -2.475,
        -1.905
      ],
      "corner": "top-left",
      "source": "silk-marker",
      "derived_from": "SOIC-8_3.9x4.9mm_P1.27mm@sha256:074ecb2092b24fa4",
      "mark": "drawn"
    },
    "models_3d": [
      {
        "file": "gm1302.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": "gm1302-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": "cb8435952ca30f1b5724611547264ffd0080886d10157c42a318d6d07bbcc067",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "GATEMODE",
      "Package": "SOIC-8",
      "Category": "RTC",
      "Pins": "8"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "gm1302"
  ],
  "discovery_pitch": "GM1302 (GATEMODE) component page with datasheet-verified CAD.",
  "author": {
    "name": "Ray"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "gm1302.kicad_sym",
    "gm1302.kicad_mod",
    "gm1302.glb",
    "gm1302.step",
    "gm1302-etched.step",
    "gm1302.lbr",
    "docs/hero.png",
    "docs/gm1302-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html"
  ],
  "visibility": {
    "public": true
  },
  "updated_at": "2026-09-24T21:03:58.674Z"
}