CH554T

{
  "slug": "ch554t",
  "version": "0.1.0",
  "type": "component",
  "description": "WCH(Jiangsu Qin Heng) Microcontroller Units (MCUs/MPUs/SOCs), TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "single chip microcomputer-microcontroller",
    "ch554t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ch554t.kicad_sym",
    "ch554t.kicad_mod",
    "ch554t.glb",
    "ch554t.step",
    "ch554t.lbr",
    "docs/hero.png",
    "docs/ch554t-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ch554t-hero.glb",
    "ch554t-hero.overlay.json",
    "ch554t-etched.glb"
  ],
  "component": {
    "mpn": "CH554T",
    "manufacturer": "WCH(Jiangsu Qin Heng)",
    "package": "TSSOP-20",
    "pin_count": 20,
    "category": "Single Chip Microcomputer/Microcontroller",
    "subcategory": "Microcontroller Units (MCUs/MPUs/SOCs)",
    "datasheet": "https://datasheet.lcsc.com/datasheet/pdf/00dfbe129dbe176fbe2bcbec3fbe9ded.pdf",
    "parts": {
      "symbol": "ch554t.kicad_sym",
      "footprint": "ch554t.kicad_mod",
      "model_3d": "ch554t-hero.glb",
      "model_3d_plain": "ch554t-etched.glb",
      "model_3d_step": "ch554t-etched.step",
      "model_3d_step_plain": "ch554t.step",
      "lbr": "ch554t.lbr"
    },
    "distributor_links": {
      "lcsc": "C2928938"
    },
    "distributor_check": {
      "checked_at": "2026-10-23T03:00:07Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "P3.2",
        "type": "bidirectional",
        "description": "GPIO P3.2 with alternate functions TXD1_ (UART1 TX remap), INT0 (external interrupt 0), VBUS1 (USB type-C bus voltage detect) and AIN3 (ADC channel 3)."
      },
      {
        "number": "2",
        "name": "P1.4",
        "type": "bidirectional",
        "description": "GPIO P1.4 with alternate functions T2_/CAP1_, SCS (SPI0 chip select), TIN2 (touch key), UCC1 (USB type-C config channel) and AIN1 (ADC channel 1); also used for in-circuit programming chip select."
      },
      {
        "number": "3",
        "name": "P1.5",
        "type": "bidirectional",
        "description": "GPIO P1.5 with alternate functions MOSI (SPI0), PWM1 output, TIN3 (touch key), UCC2 (USB type-C config channel) and AIN2 (ADC channel 2)."
      },
      {
        "number": "4",
        "name": "P1.6",
        "type": "bidirectional",
        "description": "GPIO P1.6 with alternate functions MISO (SPI0), RXD1 (UART1 receive) and TIN4 (touch key); also used as programming data output."
      },
      {
        "number": "5",
        "name": "P1.7",
        "type": "bidirectional",
        "description": "GPIO P1.7 with alternate functions SCK (SPI0 clock), TXD1 (UART1 transmit) and TIN5 (touch key); also used as programming clock input."
      },
      {
        "number": "6",
        "name": "RST",
        "type": "input",
        "description": "External reset input (active high) with built-in pull-down resistor; also T2EX_/CAP2_ alternate function."
      },
      {
        "number": "7",
        "name": "P1.0",
        "type": "bidirectional",
        "description": "GPIO P1.0 with alternate functions T2 (Timer2 external count/clock output), CAP1 (capture input 1) and TIN0 (touch key)."
      },
      {
        "number": "8",
        "name": "P1.1",
        "type": "bidirectional",
        "description": "GPIO P1.1 with alternate functions T2EX (Timer2 reload/capture input), CAP2, TIN1 (touch key), VBUS2 (USB type-C bus voltage detect) and AIN0 (ADC channel 0)."
      },
      {
        "number": "9",
        "name": "P3.1",
        "type": "bidirectional",
        "description": "GPIO P3.1 with alternate functions PWM2_ (PWM2 remap) and TXD (UART0 transmit)."
      },
      {
        "number": "10",
        "name": "P3.0",
        "type": "bidirectional",
        "description": "GPIO P3.0 with alternate functions PWM1_ (PWM1 remap) and RXD (UART0 receive)."
      },
      {
        "number": "11",
        "name": "P3.3",
        "type": "bidirectional",
        "description": "GPIO P3.3 with alternate function INT1 (external interrupt 1 input)."
      },
      {
        "number": "12",
        "name": "P3.4",
        "type": "bidirectional",
        "description": "GPIO P3.4 with alternate functions PWM2 output, RXD1_ (UART1 receive remap) and T0 (Timer0 external input)."
      },
      {
        "number": "13",
        "name": "P3.5",
        "type": "bidirectional",
        "description": "GPIO P3.5 with alternate function T1 (Timer1 external input)."
      },
      {
        "number": "14",
        "name": "P3.6",
        "type": "bidirectional",
        "description": "GPIO P3.6 or USB UDP (D+) signal; powered from V33 so high level only reaches V33 and 5V is not supported; no series resistor when used for USB."
      },
      {
        "number": "15",
        "name": "P3.7",
        "type": "bidirectional",
        "description": "GPIO P3.7 or USB UDM (D-) signal; powered from V33 so high level only reaches V33 and 5V is not supported; no series resistor when used for USB."
      },
      {
        "number": "16",
        "name": "P1.3",
        "type": "bidirectional",
        "description": "GPIO P1.3 with alternate functions XO (external crystal inverting output) and TXD_ (UART0 transmit remap)."
      },
      {
        "number": "17",
        "name": "P1.2",
        "type": "bidirectional",
        "description": "GPIO P1.2 with alternate functions XI (external crystal oscillator input) and RXD_ (UART0 receive remap)."
      },
      {
        "number": "18",
        "name": "GND",
        "type": "power_in",
        "description": "Common ground (VSS)."
      },
      {
        "number": "19",
        "name": "VCC",
        "type": "power_in",
        "description": "Power supply input (3V to 5V range supported); requires an external 0.1uF decoupling capacitor."
      },
      {
        "number": "20",
        "name": "V33",
        "type": "power_out",
        "description": "Internal USB regulator output and internal 3.3V supply input; connect to VCC when supply is below 3.6V, otherwise add an external 0.1uF decoupling capacitor."
      }
    ],
    "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: V33 is both the LDO output and a supply input (tied to VCC at 3.3V); type power_out chosen, could be"
        ],
        "pages_sent": 51,
        "cost_usd": 0.5718,
        "at": "2026-10-23T02:59:38"
      },
      "datasheet": {
        "url": "https://datasheet.lcsc.com/datasheet/pdf/00dfbe129dbe176fbe2bcbec3fbe9ded.pdf",
        "pages": 57,
        "sha256": "37b210d9d54d43d6",
        "source_tier": "lcsc"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 20,
        "described": 20,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    },
    "models_3d": [
      {
        "file": "ch554t.step",
        "role": "plain",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.2
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "97339947f3a7196470ec2f1d9f9b92bb2fc2ab66ad53be0cf105192585ef3c9a",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ch554t-etched.step",
        "role": "eda",
        "up": "Z",
        "units": "mm",
        "origin": "footprint origin = pad-pattern centre",
        "seat": "z = 0",
        "extents_mm": [
          6.4,
          6.5,
          1.2
        ],
        "zmin_mm": -0.0,
        "centre_offset_mm": 0.0,
        "footprint_binding": "identity",
        "sha256": "577a0c42220d0c798897ffa18f323c025600f57440f6ef2654ca9bc8fd8752f1",
        "checked": "2026-10-23",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}