ISD3900FYI

{
  "slug": "isd3900fyi",
  "version": "0.1.0",
  "type": "component",
  "description": "Nuvoton Tech Audio Interface ICs, LQFP-48(7x7). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "communication interface chip-uart-485-232",
    "isd3900fyi",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "isd3900fyi.kicad_sym",
    "isd3900fyi.kicad_mod",
    "isd3900fyi.glb",
    "isd3900fyi.step",
    "isd3900fyi.lbr",
    "docs/hero.png",
    "docs/isd3900fyi-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "isd3900fyi-hero.glb",
    "isd3900fyi-hero.overlay.json",
    "isd3900fyi-etched.glb"
  ],
  "component": {
    "mpn": "ISD3900FYI",
    "manufacturer": "Nuvoton Tech",
    "package": "LQFP-48(7x7)",
    "pin_count": 48,
    "category": "Communication Interface Chip/UART/485/232",
    "subcategory": "Audio Interface ICs",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/92220ccb120f850c6751d5067a06100e.pdf",
    "parts": {
      "symbol": "isd3900fyi.kicad_sym",
      "footprint": "isd3900fyi.kicad_mod",
      "model_3d": "isd3900fyi-hero.glb",
      "model_3d_plain": "isd3900fyi-etched.glb",
      "model_3d_step": "isd3900fyi-etched.step",
      "model_3d_step_plain": "isd3900fyi.step",
      "lbr": "isd3900fyi.lbr"
    },
    "distributor_links": {
      "lcsc": "C2613393"
    },
    "distributor_check": {
      "checked_at": "2026-10-28T23:49:44Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "deferred",
        "error": "shared DigiKey quota guard: 988 calls left today"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      },
      {
        "number": "2",
        "name": "CSB",
        "type": "output",
        "description": "Chip Select Bar of the external serial flash interface."
      },
      {
        "number": "3",
        "name": "DI",
        "type": "input",
        "description": "Serial data input to the external serial flash interface, connected to the flash memory data output (DO)."
      },
      {
        "number": "4",
        "name": "I2S_SDI/GPIO7",
        "type": "input",
        "description": "Serial Data Input of the I2S interface; should be grounded if I2S is not used, or it can be configured as GPIO7."
      },
      {
        "number": "5",
        "name": "I2S_SCK/GPIO6",
        "type": "bidirectional",
        "description": "I2S clock input in slave mode or clock output in master mode; should be grounded if I2S is not used, or it can be configured as an external clock buffer or as GPIO6."
      },
      {
        "number": "6",
        "name": "I2S_WS/GPIO5",
        "type": "bidirectional",
        "description": "I2S Word Select input in slave mode or output in master mode; should be grounded if I2S is not used, or it can be configured as GPIO5."
      },
      {
        "number": "7",
        "name": "I2S_SDO/GPIO4",
        "type": "output",
        "description": "Serial Data Output of the I2S interface; should be left unconnected if I2S is not used, or it can be configured as GPIO4."
      },
      {
        "number": "8",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      },
      {
        "number": "9",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      },
      {
        "number": "10",
        "name": "VSSD",
        "type": "power_in",
        "description": "Digital ground."
      },
      {
        "number": "11",
        "name": "VCCD",
        "type": "power_in",
        "description": "Digital power supply (VDD 2.7V to 3.6V per operating conditions)."
      },
      {
        "number": "12",
        "name": "VREG",
        "type": "power_out",
        "description": "A 1.8V regulator output supplying the internal logic; a 0.1uF capacitor should be connected to this pin for supply decoupling and stability."
      },
      {
        "number": "13",
        "name": "MISO",
        "type": "output",
        "description": "Master-In-Slave-Out serial output from the ISD3900 to the host; tri-state when SSB=1."
      },
      {
        "number": "14",
        "name": "SCLK",
        "type": "input",
        "description": "Serial clock input to the ISD3900 from the host."
      },
      {
        "number": "15",
        "name": "SSB",
        "type": "input",
        "description": "Slave select input from the host; when low the device is selected and responds to SPI commands."
      },
      {
        "number": "16",
        "name": "MOSI",
        "type": "input",
        "description": "Master-Out-Slave-In serial input to the ISD3900 from the host."
      },
      {
        "number": "17",
        "name": "VCCD_PWM",
        "type": "power_in",
        "description": "Digital power for the PWM driver."
      },
      {
        "number": "18",
        "name": "SPK+",
        "type": "output",
        "description": "PWM driver positive output that, with SPK-, drives an 8 ohm speaker or buzzer differentially; tri-state during power down; can alternatively be configured as BTL or independently switched to AUDOUT or AUXOUT."
      },
      {
        "number": "19",
        "name": "VSSD_PWM",
        "type": "power_in",
        "description": "Digital ground for the PWM driver."
      },
      {
        "number": "20",
        "name": "SPK-",
        "type": "output",
        "description": "PWM driver negative output that, with SPK+, drives an 8 ohm speaker or buzzer differentially; tri-state during power down; can alternatively be configured as BTL or independently switched to AUDOUT or AUXOUT."
      },
      {
        "number": "21",
        "name": "VCCD_PWM",
        "type": "power_in",
        "description": "Digital power for the PWM driver."
      },
      {
        "number": "22",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      },
      {
        "number": "23",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      },
      {
        "number": "24",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      },
      {
        "number": "25",
        "name": "INTB",
        "type": "output",
        "description": "Active-low interrupt request pin; open-drain output."
      },
      {
        "number": "26",
        "name": "RDY/BSYB",
        "type": "output",
        "description": "Reports the status of SPI data transfer; high indicates the ISD3900 is ready to accept new SPI commands or data."
      },
      {
        "number": "27",
        "name": "RESET",
        "type": "input",
        "description": "Applying power to this pin resets the chip; a high pulse of 50ms or more will reset the chip."
      },
      {
        "number": "28",
        "name": "DO",
        "type": "output",
        "description": "Serial data output of the external serial flash interface, connected to the flash data input (DI)."
      },
      {
        "number": "29",
        "name": "CLK",
        "type": "output",
        "description": "Serial data clock of the external serial flash interface."
      },
      {
        "number": "30",
        "name": "GPIO3",
        "type": "bidirectional",
        "description": "General-purpose I/O pin."
      },
      {
        "number": "31",
        "name": "GPIO2",
        "type": "bidirectional",
        "description": "General-purpose I/O pin."
      },
      {
        "number": "32",
        "name": "GPIO1",
        "type": "bidirectional",
        "description": "General-purpose I/O pin."
      },
      {
        "number": "33",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      },
      {
        "number": "34",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      },
      {
        "number": "35",
        "name": "XTALOUT",
        "type": "output",
        "description": "Crystal interface output pin."
      },
      {
        "number": "36",
        "name": "XTALIN",
        "type": "input",
        "description": "Depending on the CLK_CFG register, connects to a crystal/resonator with XTALOUT, to a GND-referenced resistor as oscillator reference current (XTALOUT left unconnected), or to an external clock input (XTALOUT left unconnected)."
      },
      {
        "number": "37",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      },
      {
        "number": "38",
        "name": "GPIO0",
        "type": "bidirectional",
        "description": "General-purpose I/O pin."
      },
      {
        "number": "39",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      },
      {
        "number": "40",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      },
      {
        "number": "41",
        "name": "AUDOUT",
        "type": "output",
        "description": "Audio output configurable by SPI command as a voltage or current output; leave unconnected if not used."
      },
      {
        "number": "42",
        "name": "AUXOUT",
        "type": "output",
        "description": "Aux output, an analog voltage output; leave unconnected if not used."
      },
      {
        "number": "43",
        "name": "VCCA",
        "type": "power_in",
        "description": "Analog power supply pin."
      },
      {
        "number": "44",
        "name": "VSSA",
        "type": "power_in",
        "description": "Analog ground pin."
      },
      {
        "number": "45",
        "name": "ANAOUT/MIC-",
        "type": "output",
        "description": "Variable gain analog output with gain set by feedback resistance to ANAIN, or configurable as MIC- with MIC+ for a differential microphone input; leave unconnected if ANAIN/ANAOUT is not used."
      },
      {
        "number": "46",
        "name": "ANAIN/MIC+",
        "type": "input",
        "description": "Variable gain analog input, or configurable as MIC+ with MIC- for a differential microphone input; leave unconnected if ANAIN/ANAOUT is not used."
      },
      {
        "number": "47",
        "name": "AUXIN",
        "type": "input",
        "description": "Auxiliary input with gain set by SPI command; leave unconnected if not used."
      },
      {
        "number": "48",
        "name": "NC",
        "type": "unconnected",
        "description": "This pin should be left unconnected."
      }
    ],
    "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: Package drawing for the 48-lead LQFP (7x7x1.4mm) is an image on page 19 with no text; the 7x7 mm bod; Pin-number-to-name mapping was taken from the pin description table (pages 8-10). The pin configurat; Pin 12 VREG is printed as type O (1.8V regulator output); mapped to KiCad power_out. Pins 5 and 6 ar"
        ],
        "pages_sent": 22,
        "cost_usd": 0.0945,
        "at": "2026-10-28T23:49:32"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/92220ccb120f850c6751d5067a06100e.pdf",
        "pages": 22,
        "sha256": "55ea4d404bcec4e0",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 48,
        "described": 48,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "file": "isd3900fyi.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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          9.0,
          1.5
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "9dea352d93177c2904afd7d7b68ea8855ce1ab691f69f8b3e13655600514b6bf",
        "checked": "2026-10-28",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "isd3900fyi-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
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        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "d64a4417633b97f0aeea6e1dcc85a08ac9d08e578c6a142e31693c266c48432d",
        "checked": "2026-10-28",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}