FM33LC023U

{
  "schema_version": 1,
  "type": "component",
  "slug": "fm33lc023u",
  "title": "FM33LC023U",
  "brief": "FUDAN MICRO Other Processors and Microcontrollers (MCUs), QFN-32-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",
    "embedded processors & controllers",
    "fm33lc023u",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "FM33LC023U",
    "manufacturer": "FUDAN MICRO",
    "package": "QFN-32-EP(5x5)",
    "pin_count": 33,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Other Processors and Microcontrollers (MCUs)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/07233dfde9eabce59aac9f2feec44738.pdf",
    "parts": {
      "symbol": "fm33lc023u.kicad_sym",
      "footprint": "fm33lc023u.kicad_mod",
      "model_3d": "fm33lc023u-hero.glb",
      "model_3d_plain": "fm33lc023u-etched.glb",
      "model_3d_step": "fm33lc023u-etched.step",
      "model_3d_step_plain": "fm33lc023u.step",
      "lbr": "fm33lc023u.lbr"
    },
    "distributor_links": {
      "lcsc": "C908399"
    },
    "distributor_check": {
      "checked_at": "2026-10-22T21:55:39Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "quota"
      },
      "mouser": {
        "pn": null,
        "status": "quota"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "PD8",
        "type": "bidirectional",
        "description": "GPIO that doubles as SWIO, the SWD interface data line."
      },
      {
        "number": "2",
        "name": "NRST",
        "type": "input",
        "description": "Global reset pin; holding it low for more than 8 ms resets the chip, and it also wakes the chip from low-power modes."
      },
      {
        "number": "3",
        "name": "PA13",
        "type": "bidirectional",
        "description": "GPIO with UART0_RX, LPUART0_RX and ADC_IN6 functions."
      },
      {
        "number": "4",
        "name": "PA14",
        "type": "bidirectional",
        "description": "GPIO with UART0_TX, LPUART0_TX and ADC_IN7 functions."
      },
      {
        "number": "5",
        "name": "PA15",
        "type": "bidirectional",
        "description": "GPIO with WKUP0 wakeup input, SVS external supply detect input and ADC_IN10."
      },
      {
        "number": "6",
        "name": "PA8",
        "type": "bidirectional",
        "description": "GPIO with SEG0 (LCD), LPT32_CH1 and COMP2_INP1 functions."
      },
      {
        "number": "7",
        "name": "PA11",
        "type": "bidirectional",
        "description": "True open-drain GPIO that doubles as I2C SCL; it needs an external pull-up and has 20 mA sink capability."
      },
      {
        "number": "8",
        "name": "PA12",
        "type": "bidirectional",
        "description": "True open-drain GPIO that doubles as I2C SDA (and ADC_EXSAMP); it needs an external pull-up and has 20 mA sink capability."
      },
      {
        "number": "9",
        "name": "PB2",
        "type": "bidirectional",
        "description": "GPIO with WKUP2 wakeup input, UART4_RX and ATIM_CH1N functions."
      },
      {
        "number": "10",
        "name": "PB3",
        "type": "bidirectional",
        "description": "GPIO with UART4_TX and ATIM_CH2N functions."
      },
      {
        "number": "11",
        "name": "PB8",
        "type": "bidirectional",
        "description": "GPIO with SEG7 (LCD), SPI1_SSN and ATIM_CH3N functions."
      },
      {
        "number": "12",
        "name": "PB9",
        "type": "bidirectional",
        "description": "GPIO with SEG8 (LCD), ANATST analog test, SPI1_SCK and GPT0_ETR functions."
      },
      {
        "number": "13",
        "name": "PB10",
        "type": "bidirectional",
        "description": "GPIO with SEG9 (LCD), OPA1_INN1, SPI1_MISO and GPT0_CH1 functions."
      },
      {
        "number": "14",
        "name": "PB11",
        "type": "bidirectional",
        "description": "GPIO with SEG10 (LCD), OPA1_INP1, SPI1_MOSI and GPT0_CH2 functions."
      },
      {
        "number": "15",
        "name": "DP",
        "type": "bidirectional",
        "description": "USB D+ data line."
      },
      {
        "number": "16",
        "name": "DM",
        "type": "bidirectional",
        "description": "USB D- data line."
      },
      {
        "number": "17",
        "name": "PC2",
        "type": "bidirectional",
        "description": "GPIO with XTHIN high-frequency crystal input (4-32 MHz), UART1_RX and LPUART1_RX functions."
      },
      {
        "number": "18",
        "name": "PC3",
        "type": "bidirectional",
        "description": "GPIO with XTHOUT high-frequency crystal output, UART1_TX and LPUART1_TX functions."
      },
      {
        "number": "19",
        "name": "PC4",
        "type": "bidirectional",
        "description": "GPIO with SEG13 (LCD), OPA1_OUT and UART5_RX functions."
      },
      {
        "number": "20",
        "name": "PC5",
        "type": "bidirectional",
        "description": "GPIO with SEG14 (LCD), OPA2_OUT and UART5_TX functions."
      },
      {
        "number": "21",
        "name": "PC8",
        "type": "bidirectional",
        "description": "GPIO with SEG17 (LCD), SPI2_SCK and ADC_IN9 functions."
      },
      {
        "number": "22",
        "name": "PC9",
        "type": "bidirectional",
        "description": "GPIO with SEG18 (LCD), SPI2_MISO and ADC_IN0 functions."
      },
      {
        "number": "23",
        "name": "PC10",
        "type": "bidirectional",
        "description": "GPIO with WKUP5 wakeup input, SEG19 (LCD), SPI2_MOSI and ADC_IN1 functions."
      },
      {
        "number": "24",
        "name": "PD9",
        "type": "bidirectional",
        "description": "GPIO that doubles as XT32KO, the 32768 Hz crystal output."
      },
      {
        "number": "25",
        "name": "PD10",
        "type": "bidirectional",
        "description": "GPIO that doubles as XT32KI, the 32768 Hz crystal input."
      },
      {
        "number": "26",
        "name": "VDD15",
        "type": "power_out",
        "description": "LDO output (1.5 V core supply); connect a 100 nF capacitor to ground."
      },
      {
        "number": "27",
        "name": "VSS",
        "type": "power_in",
        "description": "Ground."
      },
      {
        "number": "28",
        "name": "VDD",
        "type": "power_in",
        "description": "Main power supply, 1.8 to 3.6 V when USB is used."
      },
      {
        "number": "29",
        "name": "PD11",
        "type": "bidirectional",
        "description": "GPIO with WKUP6 wakeup input, FOUT0 clock output, ATIM_BRK1 and ADC_IN2 functions."
      },
      {
        "number": "30",
        "name": "PD0",
        "type": "bidirectional",
        "description": "GPIO with SEG22 (LCD), UART5_RX and ADC_IN3 functions."
      },
      {
        "number": "31",
        "name": "PD1",
        "type": "bidirectional",
        "description": "GPIO with SEG23 (LCD), UART5_TX and ADC_IN4 functions."
      },
      {
        "number": "32",
        "name": "PD7",
        "type": "bidirectional",
        "description": "GPIO that doubles as SWCLK, the SWD interface clock."
      },
      {
        "number": "33",
        "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-sonnet-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 text does not describe the exposed pad (EP) of the QFN32 package or say how to connect; Table 2-1 (FM33LC0xxU) lists three package columns (LQFP64, LQFP48, QFN32), but the extracted text s; The datasheet covers the whole FM33LC0xx family. The part table lists FM33LC023U as 128 KB flash / 2"
        ],
        "pages_sent": 141,
        "cost_usd": 0.9269,
        "at": "2026-10-22T21:55:23"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/07233dfde9eabce59aac9f2feec44738.pdf",
        "pages": 707,
        "sha256": "6d623d96ef650faf",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 33,
        "described": 33,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "fm33lc023u.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5,
          5,
          0.875
        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "fm33lc023u-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,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "cc11f8c4af9110fe507aed4f9bf6b73ccfde54decfaf380f93ab7851725929b4",
        "checked": "2026-10-22",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "FUDAN MICRO",
      "Package": "QFN-32-EP(5x5)",
      "Category": "Embedded Processors & Controllers",
      "Pins": "33"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "6d623d96ef650faf0972cc57469b2162854d4e1c67526eedf93b5fcac27982d5",
      "rows": [
        {
          "name": "Supply voltage",
          "symbol": "VDD-VSS",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6.5,
          "conditions": "includes VDD, VDDA",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "Pin voltage",
          "symbol": "VPIN",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -0.3,
          "typ": null,
          "max": 6.5,
          "conditions": "VSS-0.3 to 6.5",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "Voltage difference between VDD and VDDA",
          "symbol": "|ΔVDD|",
          "kind": "absolute_maximum",
          "unit": "mV",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "Voltage difference between all ground pins",
          "symbol": "|ΔVSS|",
          "kind": "absolute_maximum",
          "unit": "mV",
          "min": null,
          "typ": null,
          "max": 50,
          "conditions": "",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "Operating temperature",
          "symbol": "TA",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 85,
          "conditions": "",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "Storage temperature",
          "symbol": "TSTG",
          "kind": "absolute_maximum",
          "unit": "°C",
          "min": -55,
          "typ": null,
          "max": 150,
          "conditions": "",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "ESD HBM, pins other than PA11, PA12, PB12",
          "symbol": "HBM",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -8000,
          "typ": null,
          "max": 8000,
          "conditions": "TA=25℃, JEDEC JS-001",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "ESD HBM, PA11, PA12, PB12",
          "symbol": "HBM",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -5000,
          "typ": null,
          "max": 5000,
          "conditions": "TA=25℃, JEDEC JS-001",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "ESD CDM",
          "symbol": "CDM",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": -1000,
          "typ": null,
          "max": 1000,
          "conditions": "TA=25℃, JEDEC JS-002",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "IO latchup trigger current",
          "symbol": "Itrigger",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": -125,
          "typ": null,
          "max": 125,
          "conditions": "-(0.5VDD) < VI < (1.5VDD), TA=25℃, JESD78E",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "IO latchup supply voltage",
          "symbol": "Vsupply",
          "kind": "absolute_maximum",
          "unit": "V",
          "min": null,
          "typ": null,
          "max": 8.25,
          "conditions": "TA=25℃, JESD78E",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "Max current into VDD (source)",
          "symbol": "ΣIVDD",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 90,
          "conditions": "",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "Max current out of VSS (sink)",
          "symbol": "ΣIVSS",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 70,
          "conditions": "",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "Total IO sink current",
          "symbol": "ΣIIO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 90,
          "conditions": "all IO sink",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "Total IO source current",
          "symbol": "ΣIIO",
          "kind": "absolute_maximum",
          "unit": "mA",
          "min": null,
          "typ": null,
          "max": 70,
          "conditions": "all IO source",
          "source_page": 63,
          "source": "datasheet"
        },
        {
          "name": "AHB clock frequency",
          "symbol": "fHCLK",
          "kind": "recommended_operating",
          "unit": "Mhz",
          "min": 0,
          "typ": null,
          "max": 64,
          "conditions": "",
          "source_page": 64,
          "source": "datasheet"
        },
        {
          "name": "APB clock frequency",
          "symbol": "fPCLK",
          "kind": "recommended_operating",
          "unit": "Mhz",
          "min": 0,
          "typ": null,
          "max": 64,
          "conditions": "",
          "source_page": 64,
          "source": "datasheet"
        },
        {
          "name": "Operating voltage (USB used)",
          "symbol": "VDD",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": 3.6,
          "conditions": "BOR enabled",
          "source_page": 64,
          "source": "datasheet"
        },
        {
          "name": "Operating voltage (USB used)",
          "symbol": "VDD",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.35,
          "typ": null,
          "max": 3.6,
          "conditions": "BOR disabled",
          "source_page": 64,
          "source": "datasheet"
        },
        {
          "name": "Analog operating voltage (USB used)",
          "symbol": "VDDA",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 1.8,
          "typ": null,
          "max": 3.6,
          "conditions": "VDDA=VDD required",
          "source_page": 64,
          "source": "datasheet"
        },
        {
          "name": "Junction temperature",
          "symbol": "TJ",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 105,
          "conditions": "TA=-40~+85C",
          "source_page": 64,
          "source": "datasheet"
        }
      ]
    }
  },
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  "discovery_triggers": [
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  "discovery_pitch": "FM33LC023U (FUDAN MICRO) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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}