AT32F421K8U7

{
  "slug": "at32f421k8u7",
  "version": "0.1.0",
  "type": "component",
  "description": "ARTERY Microcontrollers (MCU/MPU/SOC), QFN-32(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "embedded processors & controllers",
    "at32f421k8u7",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "at32f421k8u7.kicad_sym",
    "at32f421k8u7.kicad_mod",
    "at32f421k8u7.glb",
    "at32f421k8u7.step",
    "at32f421k8u7.lbr",
    "docs/hero.png",
    "docs/at32f421k8u7-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "at32f421k8u7-hero.glb",
    "at32f421k8u7-hero.overlay.json",
    "at32f421k8u7-etched.glb"
  ],
  "component": {
    "mpn": "AT32F421K8U7",
    "manufacturer": "ARTERY",
    "package": "QFN-32(5x5)",
    "pin_count": 33,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588954980052553728",
    "parts": {
      "symbol": "at32f421k8u7.kicad_sym",
      "footprint": "at32f421k8u7.kicad_mod",
      "model_3d": "at32f421k8u7-hero.glb",
      "model_3d_plain": "at32f421k8u7-etched.glb",
      "model_3d_step": "at32f421k8u7-etched.step",
      "model_3d_step_plain": "at32f421k8u7.step",
      "lbr": "at32f421k8u7.lbr"
    },
    "distributor_links": {
      "lcsc": "C2965611"
    },
    "distributor_check": {
      "checked_at": "2026-10-17T06:26:32Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "VDD",
        "type": "power_in",
        "description": "Digital power supply."
      },
      {
        "number": "2",
        "name": "PF0 / HEXT_IN",
        "type": "bidirectional",
        "description": "General I/O (TC standard level) with alternate function I2C1_SDA and additional function HEXT_IN, the 4 to 25 MHz external crystal input."
      },
      {
        "number": "3",
        "name": "PF1 / HEXT_OUT",
        "type": "bidirectional",
        "description": "General I/O (TC standard level) with alternate function I2C1_SCL and additional function HEXT_OUT, the external crystal output."
      },
      {
        "number": "4",
        "name": "NRST",
        "type": "bidirectional",
        "description": "Device reset input and internal reset output, active low, with an embedded weak pull-up resistor."
      },
      {
        "number": "5",
        "name": "VDDA / VREF+",
        "type": "power_in",
        "description": "Analog power supply and positive reference voltage for the ADC."
      },
      {
        "number": "6",
        "name": "PA0",
        "type": "bidirectional",
        "description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN0, CMP1_INP2, CMP1_INM6, WKUP1, and alternate functions TMR1_EXT, USART2_CTS, I2C2_SCL and CMP1_OUT; it loses 5 V tolerance in analog mode, where the input must stay below VDD + 0.3 V."
      },
      {
        "number": "7",
        "name": "PA1",
        "type": "bidirectional",
        "description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN1 and CMP1_INP1, and alternate functions TMR15_CH1C, USART2_RTS, I2C2_SDA and EVENTOUT; the input must stay below VDD + 0.3 V in analog mode."
      },
      {
        "number": "8",
        "name": "PA2",
        "type": "bidirectional",
        "description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN2 and CMP1_INM7, and alternate functions TMR15_CH1 and USART2_TX (bootloader USART2 TX); the input must stay below VDD + 0.3 V in analog mode."
      },
      {
        "number": "9",
        "name": "PA3",
        "type": "bidirectional",
        "description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN3, and alternate functions TMR15_CH2, USART2_RX and I2S2_MCK (bootloader USART2 RX); the input must stay below VDD + 0.3 V in analog mode."
      },
      {
        "number": "10",
        "name": "PA4",
        "type": "bidirectional",
        "description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN4 and CMP1_INM4, and alternate functions TMR14_CH1, USART2_CK, SPI1_CS and I2S1_WS; the input must stay below VDD + 0.3 V in analog mode."
      },
      {
        "number": "11",
        "name": "PA5",
        "type": "bidirectional",
        "description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN5, CMP1_INP0 and CMP1_INM5, and alternate functions SPI1_SCK and I2S1_CK; the input must stay below VDD + 0.3 V in analog mode."
      },
      {
        "number": "12",
        "name": "PA6",
        "type": "bidirectional",
        "description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN6, and alternate functions TMR1_BRK, TMR3_CH1, TMR16_CH1, SPI1_MISO, I2S1_MCK, I2S2_MCK, CMP1_OUT and EVENTOUT; the input must stay below VDD + 0.3 V in analog mode."
      },
      {
        "number": "13",
        "name": "PA7",
        "type": "bidirectional",
        "description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN7, and alternate functions TMR1_CH1C, TMR3_CH2, TMR14_CH1, TMR17_CH1, SPI1_MOSI, I2S1_SD and EVENTOUT; the input must stay below VDD + 0.3 V in analog mode."
      },
      {
        "number": "14",
        "name": "PB0",
        "type": "bidirectional",
        "description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN8, and alternate functions TMR1_CH2C, TMR3_CH3, USART2_RX, I2S1_MCK and EVENTOUT; the input must stay below VDD + 0.3 V in analog mode."
      },
      {
        "number": "15",
        "name": "PB1",
        "type": "bidirectional",
        "description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN9, and alternate functions TMR1_CH3C, TMR3_CH4, TMR14_CH1, SPI2_SCK and I2S2_CK; the input must stay below VDD + 0.3 V in analog mode."
      },
      {
        "number": "16",
        "name": "PB2",
        "type": "bidirectional",
        "description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN10 and alternate function TMR3_EXT; the input must stay below VDD + 0.3 V in analog mode."
      },
      {
        "number": "17",
        "name": "VDD",
        "type": "power_in",
        "description": "Digital power supply."
      },
      {
        "number": "18",
        "name": "PA8",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR1_CH1, USART1_CK, USART2_TX, I2C2_SCL, CLKOUT and EVENTOUT."
      },
      {
        "number": "19",
        "name": "PA9",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR1_CH2, TMR15_BRK, USART1_TX (bootloader USART1 TX), I2C1_SCL, I2C2_SMBA and CLKOUT."
      },
      {
        "number": "20",
        "name": "PA10",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR1_CH3, TMR17_BRK, USART1_RX (bootloader USART1 RX) and I2C1_SDA."
      },
      {
        "number": "21",
        "name": "PA11",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR1_CH4, USART1_CTS, I2C1_SMBA, I2C2_SCL, CMP1_OUT and EVENTOUT."
      },
      {
        "number": "22",
        "name": "PA12",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR1_EXT, USART1_RTS, I2C2_SDA and EVENTOUT."
      },
      {
        "number": "23",
        "name": "PA13",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) that is configured as SWDIO after reset, with an internal pull-up enabled on SWDIO; alternate functions include IR_OUT, SPI2_MISO and I2S2_MCK."
      },
      {
        "number": "24",
        "name": "PA14",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) that is configured as SWCLK after reset, with an internal pull-down enabled on SWCLK; alternate functions include USART2_TX, SPI2_MOSI and I2S2_SD."
      },
      {
        "number": "25",
        "name": "PA15",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions USART2_RX, SPI1_CS, I2S1_WS, SPI2_CS, I2S2_WS and EVENTOUT."
      },
      {
        "number": "26",
        "name": "PB3",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions SPI1_SCK, I2S1_CK, SPI2_SCK, I2S2_CK and EVENTOUT."
      },
      {
        "number": "27",
        "name": "PB4",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR3_CH1, TMR17_BRK, SPI1_MISO, I2S1_MCK, SPI2_MISO, I2S2_MCK, I2C2_SDA and EVENTOUT."
      },
      {
        "number": "28",
        "name": "PB5",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR3_CH2, TMR16_BRK, SPI1_MOSI, I2S1_SD, SPI2_MOSI, I2S2_SD and I2C1_SMBA, and additional function WKUP6."
      },
      {
        "number": "29",
        "name": "PB6",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR16_CH1C, USART1_TX, I2S1_MCK and I2C1_SCL."
      },
      {
        "number": "30",
        "name": "PB7",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR17_CH1C, USART1_RX and I2C1_SDA."
      },
      {
        "number": "31",
        "name": "BOOT0",
        "type": "input",
        "description": "Dedicated boot mode selection pin 0 with an embedded weak pull-down resistor."
      },
      {
        "number": "32",
        "name": "PB8",
        "type": "bidirectional",
        "description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR16_CH1 and I2C1_SCL."
      },
      {
        "number": "33",
        "name": "EPAD (VSS/VSSA)",
        "type": "power_in",
        "description": "Exposed pad serving as the digital ground and analog ground for the package."
      }
    ],
    "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: Table 5 lists no separate VSS pin for the QFN32 column; the only ground pad for this package is the ; Figure 4 (QFN32 pinout) is partially garbled in the text extraction and labels a VDD near pin 33, wh; The MPN AT32F421K8U7 has no -4 suffix, so it is the QFN32 5x5 mm variant per the part numbering tabl"
        ],
        "pages_sent": 24,
        "cost_usd": 0.1236,
        "at": "2026-10-17T06:24:44"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588954980052553728",
        "pages": 73,
        "sha256": "549f03d7f8d31eb7",
        "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": "at32f421k8u7.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.875
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "at32f421k8u7-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          5.0,
          5.0,
          0.875
        ],
        "zmin_mm": 0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "674d79e21ea6450338c72ae0d897e8afd022574333d2ef62055d3d4b0d5c3a92",
        "checked": "2026-10-17",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}