AT9880B

{
  "schema_version": 1,
  "type": "component",
  "slug": "at9880b",
  "title": "AT9880B",
  "brief": "ZHONGKEWEI GNSS Modules, QFN-40L-EP(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "iot-communication modules",
    "at9880b",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "AT9880B",
    "manufacturer": "ZHONGKEWEI",
    "package": "QFN-40L-EP(5x5)",
    "pin_count": 41,
    "category": "IoT/Communication Modules",
    "subcategory": "GNSS Modules",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8604434706083827712",
    "parts": {
      "symbol": "at9880b.kicad_sym",
      "footprint": "at9880b.kicad_mod",
      "model_3d": "at9880b-hero.glb",
      "model_3d_plain": "at9880b-etched.glb",
      "model_3d_step": "at9880b-etched.step",
      "model_3d_step_plain": "at9880b.step",
      "lbr": "at9880b.lbr"
    },
    "distributor_links": {
      "lcsc": "C42371070"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T13:54:59Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "RF1",
        "type": "input",
        "description": "L1 band RF signal input; DC voltage on this pin must not exceed 0.8V, so a DC-blocking capacitor is needed if the external LNA output carries DC."
      },
      {
        "number": "2",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; connect to GND and use as part of the RF input isolation ground next to RF1."
      },
      {
        "number": "3",
        "name": "VDD_ANA",
        "type": "power_out",
        "description": "Analog LDO output; connect a 1uF decoupling capacitor."
      },
      {
        "number": "4",
        "name": "VX_OUT",
        "type": "power_out",
        "description": "Supply output for the external TCXO, typically 1.8V; connect a 1uF decoupling capacitor."
      },
      {
        "number": "5",
        "name": "XREF",
        "type": "input",
        "description": "Reference clock input for an external TCXO (26 MHz, clipped sine, 0.5-1.5 Vpp)."
      },
      {
        "number": "6",
        "name": "TST_RF",
        "type": "passive",
        "description": "RF test port; leave unconnected when not used."
      },
      {
        "number": "7",
        "name": "VDD_BK",
        "type": "power_out",
        "description": "Backup LDO output; a decoupling capacitor must be connected to this pin whether or not a backup supply is fitted."
      },
      {
        "number": "8",
        "name": "VBAT",
        "type": "power_in",
        "description": "Backup power input for RTC and backup RAM, operating range 1.4-3.6V; may be left floating if no hot-start backup is needed."
      },
      {
        "number": "9",
        "name": "VDD_IO",
        "type": "power_in",
        "description": "Digital I/O supply input, 2.7-3.6V (3.3V typical), also powering the power-on reset and antenna detect circuits."
      },
      {
        "number": "10",
        "name": "ANT_BIAS",
        "type": "bidirectional",
        "description": "Active antenna bias output and detection; detection supply is VDD_IO up to 3.6V, with short-circuit protection limiting current to about 45-65 mA."
      },
      {
        "number": "11",
        "name": "RTC_O",
        "type": "passive",
        "description": "RTC 32.768 kHz oscillator output for a passive crystal connected between RTC_I and RTC_O."
      },
      {
        "number": "12",
        "name": "RTC_I",
        "type": "passive",
        "description": "RTC 32.768 kHz oscillator input for a passive crystal connected between RTC_I and RTC_O."
      },
      {
        "number": "13",
        "name": "GPIO2/TXD1",
        "type": "bidirectional",
        "description": "General-purpose I/O multiplexed as UART1 transmit (TXD1)."
      },
      {
        "number": "14",
        "name": "GPIO3/RXD1",
        "type": "bidirectional",
        "description": "General-purpose I/O multiplexed as UART1 receive (RXD1)."
      },
      {
        "number": "15",
        "name": "Reserved",
        "type": "bidirectional",
        "description": "Reserved digital pin; leave unconnected when not used."
      },
      {
        "number": "16",
        "name": "Reserved",
        "type": "bidirectional",
        "description": "Reserved digital pin; leave unconnected when not used."
      },
      {
        "number": "17",
        "name": "nRST",
        "type": "input",
        "description": "External active reset input with internal pull-up; leave unconnected when not used."
      },
      {
        "number": "18",
        "name": "GPIO1/RXD0",
        "type": "bidirectional",
        "description": "General-purpose I/O multiplexed as UART0 receive (RXD0), the default navigation data interface."
      },
      {
        "number": "19",
        "name": "GPIO0/TXD0",
        "type": "bidirectional",
        "description": "General-purpose I/O multiplexed as UART0 transmit (TXD0), the default navigation data output."
      },
      {
        "number": "20",
        "name": "GPIO27",
        "type": "bidirectional",
        "description": "General-purpose I/O."
      },
      {
        "number": "21",
        "name": "DX_IN",
        "type": "power_in",
        "description": "Internal DCDC input, 2.7-3.6V; place at least 2.2uF filter capacitance close to this pin."
      },
      {
        "number": "22",
        "name": "DX_OUT",
        "type": "passive",
        "description": "Internal DCDC output; requires a 4.7uH inductor and at least 10uF output capacitor (recommended 4.7uH + 10uF), or left floating when an external core supply is used."
      },
      {
        "number": "23",
        "name": "VCORE",
        "type": "power_in",
        "description": "Core LDO input, 1.2-3.6V; can be powered directly by an external supply."
      },
      {
        "number": "24",
        "name": "VDD_BB",
        "type": "power_out",
        "description": "Digital core LDO output; connect a 2.2uF decoupling capacitor."
      },
      {
        "number": "25",
        "name": "GPIO22",
        "type": "bidirectional",
        "description": "General-purpose I/O, default function is 1PPS output."
      },
      {
        "number": "26",
        "name": "Reserved",
        "type": "bidirectional",
        "description": "Reserved digital pin; leave unconnected when not used."
      },
      {
        "number": "27",
        "name": "Reserved",
        "type": "bidirectional",
        "description": "Reserved digital pin; leave unconnected when not used."
      },
      {
        "number": "28",
        "name": "Reserved",
        "type": "bidirectional",
        "description": "Test port; leave unconnected when not used."
      },
      {
        "number": "29",
        "name": "ON_OFF",
        "type": "input",
        "description": "Shutdown control with internal pull-up; driving low puts the chip into sleep mode and high resumes full operation; leave unconnected when not used."
      },
      {
        "number": "30",
        "name": "GPIO4",
        "type": "bidirectional",
        "description": "General-purpose I/O; leave unconnected when not used."
      },
      {
        "number": "31",
        "name": "GPIO5",
        "type": "bidirectional",
        "description": "General-purpose I/O; leave unconnected when not used."
      },
      {
        "number": "32",
        "name": "GPIO8",
        "type": "bidirectional",
        "description": "General-purpose I/O; leave unconnected when not used."
      },
      {
        "number": "33",
        "name": "GPIO7",
        "type": "bidirectional",
        "description": "General-purpose I/O; leave unconnected when not used."
      },
      {
        "number": "34",
        "name": "GPIO6",
        "type": "bidirectional",
        "description": "General-purpose I/O; leave unconnected when not used."
      },
      {
        "number": "35",
        "name": "GPIO10",
        "type": "bidirectional",
        "description": "General-purpose I/O; leave unconnected when not used."
      },
      {
        "number": "36",
        "name": "GPIO9",
        "type": "bidirectional",
        "description": "General-purpose I/O; leave unconnected when not used."
      },
      {
        "number": "37",
        "name": "DVDD",
        "type": "passive",
        "description": "PLL LDO output; connect a 1uF decoupling capacitor."
      },
      {
        "number": "38",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; connect to GND and use as part of the RF input isolation ground next to RF2."
      },
      {
        "number": "39",
        "name": "RF2",
        "type": "input",
        "description": "L5 band RF signal input; DC voltage on this pin must not exceed 0.8V, so a DC-blocking capacitor is needed if the external LNA output carries DC."
      },
      {
        "number": "40",
        "name": "GND",
        "type": "power_in",
        "description": "Ground; connect to GND."
      },
      {
        "number": "41",
        "name": "EP",
        "type": "passive",
        "description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
      "factory_chain": {
        "factory": "2.0.0",
        "extractor": "extract_pins 0.3",
        "primary_model": "claude-haiku-5-5",
        "primary_mode": "text",
        "consensus_model": "claude-sonnet-5-5",
        "consensus": "agreed",
        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The datasheet pinout table (section 2.2) gives only the pin names, I/O categories and functions; the; KiCad types for analog/digital IO pins are my mapping of the datasheet's categories: 'digital bidire; Pins 15, 16, 26, 27 and 28 are labelled 'Reserved' in the table; the datasheet says leave unused res",
          "exposed pad 41 added from the footprint",
          "dropped thermal pad ['EP'] absent from footprint",
          "5/41 pins cited to the wrong page (name found elsewhere): ['15:Reserved@p3', '16:Reserved@p3', '26:Reserved@p3', '27:Reserved@p3']"
        ],
        "pages_sent": 16,
        "cost_usd": 0.0767,
        "at": "2026-10-18T13:54:36"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8604434706083827712",
        "pages": 16,
        "sha256": "5fe9aedab37df3ec",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 41,
        "described": 41,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "at9880b.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5,
          5,
          0.77
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "8f37bc7a9aab4742c34f137d9822c0352acc227532830034555744338483cdfc",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "at9880b-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5,
          5,
          0.77
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "c6bbed152d2dbbbd64a844826a152d1d0b0312f08356477b31e64e6a5acbab5d",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "ZHONGKEWEI",
      "Package": "QFN-40L-EP(5x5)",
      "Category": "IoT/Communication Modules",
      "Pins": "41"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "5fe9aedab37df3ec0ce889eb5c0266eea2cd283f87d78fd8a9d1261bf4b78f6b",
      "rows": [
        {
          "name": "电源对地电压(VDD_ANA/VDD_BB/DVDD/VDD_BK)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 1.1,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "电源对地电压(VDD_IO/VCORE/VBAT/DX_IN)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 4.1,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "模拟引脚电压(RTC_O/RTC_I)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 4.1,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "射频输入管脚(RF1/RF2)",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 1.1,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "其他引脚电压",
          "symbol": "",
          "kind": "absolute_maximum",
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          "min": -0.3,
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          "max": 4.1,
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          "source": "datasheet"
        },
        {
          "name": "射频输入功率",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "dBm",
          "min": null,
          "typ": null,
          "max": 5,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "结温",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": null,
          "typ": null,
          "max": 125,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "存储温度",
          "symbol": "",
          "kind": "absolute_maximum",
          "unit": "℃",
          "min": -50,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VDD_IO",
          "symbol": "VDD_IO",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2.7,
          "typ": 3.3,
          "max": 3.6,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VBAT",
          "symbol": "VBAT",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.4,
          "typ": 3.3,
          "max": 3.6,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "VCore",
          "symbol": "VCore",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.2,
          "typ": null,
          "max": 3.6,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "DX_IN",
          "symbol": "DX_IN",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2.7,
          "typ": 3.3,
          "max": 3.6,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "工作温度",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "℃",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "RF1 射频输入频率",
          "symbol": "",
          "kind": "electrical",
          "unit": "MHz",
          "min": 1561.098,
          "typ": 1575.42,
          "max": 1602,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "TCXO 晶振幅度",
          "symbol": "",
          "kind": "electrical",
          "unit": "Vpp",
          "min": 0.5,
          "typ": null,
          "max": 1.5,
          "conditions": "Peak to peak, clipped sine wave",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "有源天线短路保护电流",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": 45,
          "typ": 50,
          "max": 65,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "低电平输入电压",
          "symbol": "Vil",
          "kind": "electrical",
          "unit": "V",
          "min": -0.3,
          "typ": 0,
          "max": null,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "低电平输出电压",
          "symbol": "Vol",
          "kind": "electrical",
          "unit": "V",
          "min": 0,
          "typ": null,
          "max": 0.4,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "复位电压",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.65,
          "max": null,
          "conditions": "@VDD_IO",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "复位时间",
          "symbol": "",
          "kind": "electrical",
          "unit": "ms",
          "min": null,
          "typ": 160,
          "max": null,
          "conditions": "",
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        },
        {
          "name": "TCXO 晶振频率",
          "symbol": "",
          "kind": "electrical",
          "unit": "MHz",
          "min": null,
          "typ": 26,
          "max": null,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "TCXO 晶振电源电压 VX_OUT 输出电压",
          "symbol": "VX_OUT",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 1.8,
          "max": null,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "有源天线检测电流",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 3,
          "max": null,
          "conditions": "VDD_IO=3.3V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "天线检测电路压降",
          "symbol": "",
          "kind": "electrical",
          "unit": "V",
          "min": null,
          "typ": 0.3,
          "max": null,
          "conditions": "50mA@VDD_IO=3.3V",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "连续运行模式工作电流",
          "symbol": "",
          "kind": "electrical",
          "unit": "mA",
          "min": null,
          "typ": 25,
          "max": null,
          "conditions": "",
          "source_page": 6,
          "source": "datasheet"
        },
        {
          "name": "电池备份电流",
          "symbol": "",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 30,
          "max": null,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "休眠模式电流",
          "symbol": "",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 50,
          "max": null,
          "conditions": "ON_OFF=0",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "RTC Crystal 频率",
          "symbol": "",
          "kind": "electrical",
          "unit": "kHz",
          "min": null,
          "typ": 32.768,
          "max": null,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "RTC Crystal 等效串联电阻 Rs",
          "symbol": "Rs",
          "kind": "electrical",
          "unit": "kΩ",
          "min": null,
          "typ": 80,
          "max": null,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "RTC Crystal 串联电容",
          "symbol": "",
          "kind": "electrical",
          "unit": "pF",
          "min": null,
          "typ": 12.5,
          "max": null,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "漏电流输入管脚",
          "symbol": "Ileak",
          "kind": "electrical",
          "unit": "uA",
          "min": null,
          "typ": 1,
          "max": null,
          "conditions": "",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "上拉电阻",
          "symbol": "Rpu",
          "kind": "electrical",
          "unit": "kΩ",
          "min": null,
          "typ": 80,
          "max": null,
          "conditions": "VDD_IO=3.3V",
          "source_page": 7,
          "source": "datasheet"
        },
        {
          "name": "下拉电阻",
          "symbol": "Rpd",
          "kind": "electrical",
          "unit": "kΩ",
          "min": null,
          "typ": 80,
          "max": null,
          "conditions": "VDD_IO=3.3V",
          "source_page": 7,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
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    "viewers",
    "readme",
    "breadcrumbs",
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  ],
  "discovery_triggers": [
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  ],
  "discovery_pitch": "AT9880B (ZHONGKEWEI) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
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    "path": "docs/hero.png"
  },
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    "README.md",
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    "at9880b.glb",
    "at9880b.step",
    "at9880b.lbr",
    "docs/hero.png",
    "docs/at9880b-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "at9880b-hero.glb",
    "at9880b-hero.overlay.json",
    "at9880b-etched.glb"
  ],
  "visibility": {
    "public": true
  }
}