AT32F421K8T7

{
  "schema_version": 1,
  "type": "component",
  "slug": "at32f421k8t7",
  "title": "AT32F421K8T7",
  "brief": "ARTERY Microcontrollers (MCU/MPU/SOC), LQFP-32(7x7). 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",
    "at32f421k8t7",
    "factory-2.0.0",
    "extractor-text"
  ],
  "component": {
    "mpn": "AT32F421K8T7",
    "manufacturer": "ARTERY",
    "package": "LQFP-32(7x7)",
    "pin_count": 32,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589041814343335936",
    "parts": {
      "symbol": "at32f421k8t7.kicad_sym",
      "footprint": "at32f421k8t7.kicad_mod",
      "model_3d": "at32f421k8t7-hero.glb",
      "model_3d_plain": "at32f421k8t7-etched.glb",
      "model_3d_step": "at32f421k8t7-etched.step",
      "model_3d_step_plain": "at32f421k8t7.step",
      "lbr": "at32f421k8t7.lbr"
    },
    "distributor_links": {
      "lcsc": "C3029575"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T00:13:32Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "error",
        "error": "The read operation timed out"
      },
      "mouser": {
        "pn": null,
        "status": "error",
        "error": "The read operation timed out"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD",
        "type": "power_in",
        "description": "Digital supply for I/O pins, ERTC, LSE, backup registers and the internal regulator, specified at 2.4 V to 3.6 V."
      },
      {
        "number": "2",
        "name": "PF0 / OSC_IN",
        "type": "bidirectional",
        "description": "Standard-level (TC, not 5 V tolerant) GPIO that doubles as the HSE oscillator input OSC_IN (4-25 MHz crystal/resonator) and I2C1_SDA."
      },
      {
        "number": "3",
        "name": "PF1 / OSC_OUT",
        "type": "bidirectional",
        "description": "Standard-level (TC, not 5 V tolerant) GPIO that doubles as the HSE oscillator output OSC_OUT and I2C1_SCL."
      },
      {
        "number": "4",
        "name": "NRST",
        "type": "bidirectional",
        "description": "Active-low device reset input and internal reset output with a built-in weak pull-up (RPU typically 40 kΩ, 30-50 kΩ range)."
      },
      {
        "number": "5",
        "name": "VDDA / VREF+",
        "type": "power_in",
        "description": "Analog supply for the ADC and comparator (2.4 V to 3.6 V), which must be connected to VDD, and also the positive ADC reference VREF+."
      },
      {
        "number": "6",
        "name": "PA0",
        "type": "bidirectional",
        "description": "5 V tolerant (FTa) GPIO with ADC_IN0, COMP_INP2/COMP_INM6, WKUP1, TMR1_ETR, USART2_CTS, I2C2_SCL and COMP_OUT functions; in analog mode the input must stay below VDD + 0.3 V."
      },
      {
        "number": "7",
        "name": "PA1",
        "type": "bidirectional",
        "description": "5 V tolerant (FTa) GPIO with ADC_IN1, COMP_INP1, TMR15_CH1N, USART2_RTS, I2C2_SDA and EVENTOUT functions; in analog mode the input must stay below VDD + 0.3 V."
      },
      {
        "number": "8",
        "name": "PA2",
        "type": "bidirectional",
        "description": "5 V tolerant (FTa) GPIO with ADC_IN2, COMP2_INM7, TMR15_CH1 and USART2_TX functions; in analog mode the input must stay below VDD + 0.3 V."
      },
      {
        "number": "9",
        "name": "PA3",
        "type": "bidirectional",
        "description": "5 V tolerant (FTa) GPIO with ADC_IN3, TMR15_CH2, USART2_RX and I2S2_MCK functions; in analog mode the input must stay below VDD + 0.3 V."
      },
      {
        "number": "10",
        "name": "PA4",
        "type": "bidirectional",
        "description": "5 V tolerant (FTa) GPIO with ADC_IN4, COMP_INM4, TMR14_CH1, USART2_CK, SPI1_NSS and I2S1_WS functions; in analog mode the input must stay below VDD + 0.3 V."
      },
      {
        "number": "11",
        "name": "PA5",
        "type": "bidirectional",
        "description": "5 V tolerant (FTa) GPIO with ADC_IN5, COMP_INP0, COMP_INM5, SPI1_SCK and I2S1_CK functions; in analog mode the input must stay below VDD + 0.3 V."
      },
      {
        "number": "12",
        "name": "PA6",
        "type": "bidirectional",
        "description": "5 V tolerant (FTa) GPIO with ADC_IN6, TMR1_BKIN, TMR3_CH1, TMR16_CH1, SPI1_MISO, I2S1_MCK, I2S2_MCK, COMP_OUT and EVENTOUT functions; in analog mode the input must stay below VDD + 0.3 V."
      },
      {
        "number": "13",
        "name": "PA7",
        "type": "bidirectional",
        "description": "5 V tolerant (FTa) GPIO with ADC_IN7, TMR1_CH1N, TMR3_CH2, TMR14_CH1, TMR17_CH1, SPI1_MOSI, I2S1_SD and EVENTOUT functions; in analog mode the input must stay below VDD + 0.3 V."
      },
      {
        "number": "14",
        "name": "PB0",
        "type": "bidirectional",
        "description": "5 V tolerant (FTa) GPIO with ADC_IN8, TMR1_CH2N, TMR3_CH3, USART2_RX, I2S1_MCK and EVENTOUT functions; in analog mode the input must stay below VDD + 0.3 V."
      },
      {
        "number": "15",
        "name": "PB1",
        "type": "bidirectional",
        "description": "5 V tolerant (FTa) GPIO with ADC_IN9, TMR1_CH3N, TMR3_CH4, TMR14_CH1, SPI2_SCK and I2S2_CK functions; in analog mode the input must stay below VDD + 0.3 V."
      },
      {
        "number": "16",
        "name": "VSS",
        "type": "power_in",
        "description": "Digital ground."
      },
      {
        "number": "17",
        "name": "VDD",
        "type": "power_in",
        "description": "Digital supply for I/O pins, ERTC, LSE, backup registers and the internal regulator, specified at 2.4 V to 3.6 V."
      },
      {
        "number": "18",
        "name": "PA8",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO with TMR1_CH1, USART1_CK, UART2_TX, I2C2_SCL, CLKOUT and EVENTOUT functions."
      },
      {
        "number": "19",
        "name": "PA9",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO with TMR1_CH2, TMR15_BKIN, USART1_TX, I2C1_SCL, I2C2_SMBA and CLKOUT functions."
      },
      {
        "number": "20",
        "name": "PA10",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO with TMR1_CH3, TMR17_BKIN, USART1_RX and I2C1_SDA functions."
      },
      {
        "number": "21",
        "name": "PA11",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO with TMR1_CH4, USART1_CTS, I2C1_SMBA, I2C2_SCL, COMP_OUT and EVENTOUT functions."
      },
      {
        "number": "22",
        "name": "PA12",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO with TMR1_ETR, USART1_RTS, I2C2_SDA and EVENTOUT functions."
      },
      {
        "number": "23",
        "name": "PA13",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO that is configured as the SWDIO serial-wire debug data pin after reset, with its internal pull-up enabled; also IR_OUT, SPI2_MISO and I2S2_MCK."
      },
      {
        "number": "24",
        "name": "PA14",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO that is configured as the SWCLK serial-wire debug clock pin after reset, with its internal pull-down enabled; also USART2_TX, SPI2_MOSI and I2S2_SD."
      },
      {
        "number": "25",
        "name": "PA15",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO with USART2_RX, SPI1_NSS, I2S1_WS, SPI2_NSS, I2S2_WS and EVENTOUT functions."
      },
      {
        "number": "26",
        "name": "PB3",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO with SPI1_SCK, I2S1_CK, SPI2_SCK, I2S2_CK and EVENTOUT functions."
      },
      {
        "number": "27",
        "name": "PB4",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO with TMR3_CH1, TMR17_BKIN, SPI1_MISO, I2S1_MCK, SPI2_MISO, I2S2_MCK, I2C2_SDA and EVENTOUT functions."
      },
      {
        "number": "28",
        "name": "PB5",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO with WKUP6, TMR3_CH2, TMR16_BKIN, SPI1_MOSI, I2S1_SD, SPI2_MOSI, I2S2_SD and I2C1_SMBA functions."
      },
      {
        "number": "29",
        "name": "PB6",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO with TMR16_CH1N, USART1_TX, I2S1_MCK and I2C1_SCL functions."
      },
      {
        "number": "30",
        "name": "PB7",
        "type": "bidirectional",
        "description": "5 V tolerant (FT) GPIO with TMR17_CH1N, USART1_RX and I2C1_SDA functions."
      },
      {
        "number": "31",
        "name": "BOOT0",
        "type": "input",
        "description": "Boot mode selection input (with nBOOT1 user option bit) sampled at startup, with a built-in weak pull-down that cannot be disabled."
      },
      {
        "number": "32",
        "name": "VSS",
        "type": "power_in",
        "description": "Digital ground."
      }
    ],
    "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: Source datasheet is in Chinese; pin descriptions were translated and condensed into one sentence eac; Table 5 gives no LQFP32-specific footnotes; footnotes (3) and (4) for PA11/PA12 apply only to TSSOP2"
        ],
        "pages_sent": 72,
        "cost_usd": 0.2552,
        "at": "2026-10-18T00:12:01"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589041814343335936",
        "pages": 80,
        "sha256": "13db109fb9f3fe38",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 32,
        "described": 32,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
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        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          9,
          9,
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        ],
        "zmin_mm": 0,
        "centre_offset_mm": 0,
        "footprint_binding": "identity",
        "sha256": "be0e412f1c66fee70039b0e109e0cc7c823161dda97593718afa97569bc61ce3",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "at32f421k8t7-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
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        "sha256": "f32e984cd18f89154f9368e3346801a5014fd00092f00d79d6f2a1b65711465e",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  },
  "metadata": {
    "specs": {
      "Manufacturer": "ARTERY",
      "Package": "LQFP-32(7x7)",
      "Category": "Embedded Processors & Controllers",
      "Pins": "32"
    },
    "characteristics": {
      "version": 1,
      "source": "datasheet",
      "datasheet_sha256": "13db109fb9f3fe38e20b4845d04fd5c7fedb4aaedcddaf8ef0976c5e8f30d100",
      "rows": [
        {
          "name": "Supply voltage (VDD and I/O)",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "V",
          "min": 2.4,
          "typ": null,
          "max": 3.6,
          "conditions": "Power supply and I/O pins, feature summary",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "Operating temperature range",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "°C",
          "min": -40,
          "typ": null,
          "max": 105,
          "conditions": "Temperature range",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "48 MHz RC oscillator accuracy (factory calibrated)",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": -1,
          "typ": null,
          "max": 1,
          "conditions": "TA = 25 °C",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "48 MHz RC oscillator accuracy (factory calibrated)",
          "symbol": "",
          "kind": "tolerance",
          "unit": "%",
          "min": -2,
          "typ": null,
          "max": 2,
          "conditions": "TA = -40 °C to +105 °C",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "External crystal oscillator frequency",
          "symbol": "",
          "kind": "recommended_operating",
          "unit": "MHz",
          "min": 4,
          "typ": null,
          "max": 25,
          "conditions": "HSE crystal oscillator, feature summary",
          "source_page": 1,
          "source": "datasheet"
        },
        {
          "name": "CPU operating frequency",
          "symbol": "fAHB",
          "kind": "recommended_operating",
          "unit": "MHz",
          "min": null,
          "typ": null,
          "max": 120,
          "conditions": "Maximum, with memory protection unit (MPU)",
          "source_page": 1,
          "source": "datasheet"
        }
      ]
    }
  },
  "variants": [],
  "sections": [
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  "discovery_triggers": [
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  ],
  "discovery_pitch": "AT32F421K8T7 (ARTERY) component page: datasheet pinout, KiCad symbol, footprint and 3D.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
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    "path": "docs/hero.png"
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  "visibility": {
    "public": true
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}