CP2102N

{
  "schema_version": 1,
  "type": "component",
  "slug": "cp2102n",
  "title": "CP2102N",
  "brief": "Silicon Labs single-chip USB 2.0-to-UART bridge, QFN-28. Up to 3 Mbps, integrated transceiver/regulator/clock. Datasheet-verified.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "component",
    "interface",
    "usb-uart",
    "usb-bridge",
    "virtual-com-port",
    "qfn-28",
    "silicon-labs"
  ],
  "component": {
    "mpn": "CP2102N",
    "manufacturer": "Silicon Labs",
    "package": "QFN-28",
    "pin_count": 29,
    "category": "Interface IC",
    "subcategory": "USB-to-UART bridge",
    "datasheet": "https://www.silabs.com/documents/public/data-sheets/cp2102n-datasheet.pdf",
    "parts": {
      "symbol": "cp2102n.kicad_sym",
      "footprint": "cp2102n.kicad_mod",
      "model_3d": "cp2102n-etched.glb",
      "model_3d_plain": "cp2102n.glb",
      "lbr": "cp2102n.lbr",
      "model_3d_step": "cp2102n-etched.step",
      "model_3d_step_plain": "cp2102n.step"
    },
    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "DCD",
        "type": "input",
        "description": "Data Carrier Detect modem-control input (active low)."
      },
      {
        "number": "2",
        "name": "RI/CLK",
        "type": "bidirectional",
        "description": "Ring Indicator modem-control input (active low) or optional clock output (CLK). Function is selected by device configuration."
      },
      {
        "number": "3",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference."
      },
      {
        "number": "4",
        "name": "D+",
        "type": "bidirectional",
        "description": "USB 2.0 full-speed data positive line."
      },
      {
        "number": "5",
        "name": "D-",
        "type": "bidirectional",
        "description": "USB 2.0 full-speed data negative line."
      },
      {
        "number": "6",
        "name": "VDD",
        "type": "power_in",
        "description": "3.3 V core supply. Serves as the 3.3 V output of the internal 5 V-to-3.3 V regulator when VREGIN is powered, or as a direct 3.0-3.6 V supply input when the regulator is bypassed. Requires a 4.7 µF and 0.1 µF bypass capacitor close to the pin."
      },
      {
        "number": "7",
        "name": "VREGIN",
        "type": "power_in",
        "description": "5 V voltage regulator input (3.6-5.25 V). Powers the internal regulator that produces 3.3 V on VDD. Tie to VBUS for bus-powered designs."
      },
      {
        "number": "8",
        "name": "VBUS",
        "type": "input",
        "description": "VBUS sense digital input. Connect to the 5 V USB VBUS rail; a high level on this pin indicates that a USB host is attached."
      },
      {
        "number": "9",
        "name": "RSTb",
        "type": "input",
        "description": "Active-low reset input. Recommend a 1 kΩ pull-up to VDD (or VIO on parts that have it). Driven low internally during power-on and power-failure reset events."
      },
      {
        "number": "10",
        "name": "NC",
        "type": "unconnected",
        "description": "No connect. Leave this pin floating."
      },
      {
        "number": "11",
        "name": "SUSPENDb",
        "type": "output",
        "description": "USB suspend indicator (active-low). Driven low when the device enters the USB suspend state."
      },
      {
        "number": "12",
        "name": "SUSPEND",
        "type": "output",
        "description": "USB suspend indicator (active-high). Driven high when the device enters the USB suspend state."
      },
      {
        "number": "13",
        "name": "CHREN",
        "type": "output",
        "description": "USB battery-charging enable output. Drives an external charging circuit at 100 mA."
      },
      {
        "number": "14",
        "name": "CHR1",
        "type": "output",
        "description": "USB battery-charging current-select output. Enables highest charge current (1.5 A)."
      },
      {
        "number": "15",
        "name": "CHR0",
        "type": "output",
        "description": "USB battery-charging current-select output. Enables higher charge current (500 mA)."
      },
      {
        "number": "16",
        "name": "GPIO.3/WAKEUP",
        "type": "bidirectional",
        "description": "General-purpose I/O. Alternate function: remote USB wakeup interrupt input (WAKEUP)."
      },
      {
        "number": "17",
        "name": "GPIO.2/RS485",
        "type": "bidirectional",
        "description": "General-purpose I/O. Alternate function: RS485 transceiver direction-control output."
      },
      {
        "number": "18",
        "name": "GPIO.1/RXT",
        "type": "bidirectional",
        "description": "General-purpose I/O. Alternate function: Receive LED toggle output (RXT)."
      },
      {
        "number": "19",
        "name": "GPIO.0/TXT",
        "type": "bidirectional",
        "description": "General-purpose I/O. Alternate function: Transmit LED toggle output (TXT)."
      },
      {
        "number": "20",
        "name": "GPIO.6",
        "type": "bidirectional",
        "description": "General-purpose digital I/O."
      },
      {
        "number": "21",
        "name": "GPIO.5",
        "type": "bidirectional",
        "description": "General-purpose digital I/O."
      },
      {
        "number": "22",
        "name": "GPIO.4",
        "type": "bidirectional",
        "description": "General-purpose digital I/O."
      },
      {
        "number": "23",
        "name": "CTS",
        "type": "input",
        "description": "Clear-To-Send hardware-handshaking input (active low)."
      },
      {
        "number": "24",
        "name": "RTS",
        "type": "output",
        "description": "Ready-To-Send hardware-handshaking output (active low)."
      },
      {
        "number": "25",
        "name": "RXD",
        "type": "input",
        "description": "UART asynchronous data input (Receive). Supports baud rates from 300 baud to 3 Mbaud."
      },
      {
        "number": "26",
        "name": "TXD",
        "type": "output",
        "description": "UART asynchronous data output (Transmit). Supports baud rates from 300 baud to 3 Mbaud."
      },
      {
        "number": "27",
        "name": "DSR",
        "type": "input",
        "description": "Data Set Ready modem-control input (active low)."
      },
      {
        "number": "28",
        "name": "DTR",
        "type": "output",
        "description": "Data Terminal Ready modem-control output (active low)."
      },
      {
        "number": "EP",
        "name": "GND",
        "type": "power_in",
        "description": "Center exposed thermal pad. Must be connected to the board ground plane for electrical ground and heat dissipation."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.silabs.com/documents/public/data-sheets/cp2102n-datasheet.pdf",
        "pages": 48,
        "sha256": "32fbab0ba17f394a",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 29,
        "described": 29,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "cp2102n.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5,
          5,
          0.92
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "e9d6d740f505b03e5aa0ac826330f9e269344b84656d051f50eb07ac162749eb",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "cp2102n-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5,
          5,
          0.92
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "d6e8fcc0f77d7b422f179cb82593bece801aa4967c58c7906b539a3802495879",
        "checked": "2026-10-07",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Type": "USB 2.0-to-UART bridge",
      "USB": "full-speed 12 Mbps (virtual COM port)",
      "Max UART rate": "3 Mbps",
      "Integrated": "USB PHY + regulator + clock + config ROM",
      "Modem control": "RTS/CTS/DSR/DTR/DCD/RI",
      "GPIO": "up to 7 configurable",
      "Supply voltage": "USB 5 V or 3.3 V",
      "Package": "QFN-28 (5x5 mm, EP)"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "cp2102n",
    "usb to uart",
    "usb serial bridge",
    "virtual com port",
    "cp2102"
  ],
  "discovery_pitch": "CP2102N single-chip USB-to-UART bridge (QFN-28, up to 3 Mbps) 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",
    "cp2102n.kicad_sym",
    "cp2102n.kicad_mod",
    "cp2102n.glb",
    "cp2102n.lbr",
    "docs/hero.png",
    "docs/cp2102n-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "cp2102n-etched.step"
  ],
  "variants": [
    {
      "mpn": "CP2102N-A01-GQFN28 (QFN-28)",
      "kind": "packaging"
    },
    {
      "mpn": "CP2102N-A02-GQFN28R (QFN-28, tape & reel)",
      "kind": "packaging"
    }
  ]
}