CH552T

{
  "slug": "ch552t",
  "version": "0.1.0",
  "type": "component",
  "description": "WCH Jiangsu Qin Heng USB Converters, TSSOP-20. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
  "tags": [
    "component",
    "interface",
    "ch552t",
    "factory-2.0.0",
    "extractor-text"
  ],
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
  },
  "files": [
    "page.json",
    "README.md",
    "ch552t.kicad_sym",
    "ch552t.kicad_mod",
    "ch552t.glb",
    "ch552t.step",
    "ch552t.lbr",
    "docs/hero.png",
    "docs/ch552t-datasheet.pdf",
    "viewers/symbol.html",
    "viewers/footprint.html",
    "ch552t-hero.glb",
    "ch552t-hero.overlay.json",
    "ch552t-etched.glb"
  ],
  "component": {
    "mpn": "CH552T",
    "manufacturer": "WCH Jiangsu Qin Heng",
    "package": "TSSOP-20",
    "pin_count": 20,
    "category": "Interface",
    "subcategory": "USB Converters",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618866389520302080",
    "parts": {
      "symbol": "ch552t.kicad_sym",
      "footprint": "ch552t.kicad_mod",
      "model_3d": "ch552t-hero.glb",
      "model_3d_plain": "ch552t-etched.glb",
      "model_3d_step": "ch552t-etched.step",
      "model_3d_step_plain": "ch552t.step",
      "lbr": "ch552t.lbr"
    },
    "distributor_links": {
      "lcsc": "C111367"
    },
    "distributor_check": {
      "checked_at": "2026-10-18T00:36:02Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "P3.2/TXD1_/INT0/VBUS1/AIN3",
        "type": "bidirectional",
        "description": "General-purpose I/O P3.2 with alternate functions TXD1_, INT0, VBUS1 (USB type-C bus voltage detect input) and AIN3 (ADC input channel 3); other GPIO pins default to internal pull-up resistors."
      },
      {
        "number": "2",
        "name": "P1.4/T2_/CAP1_/SCS/TIN2/UCC1/AIN1",
        "type": "bidirectional",
        "description": "General-purpose I/O P1.4 with alternate functions T2_, CAP1_, SCS (SPI0 chip select, active low), TIN2 (touch-key input), UCC1 (USB type-C configuration channel) and AIN1 (ADC input); a selected analog input pin must be set to high-impedance input or open-drain output high with pull-ups disabled."
      },
      {
        "number": "3",
        "name": "P1.5/MOSI/PWM1/TIN3/UCC2/AIN2",
        "type": "bidirectional",
        "description": "General-purpose I/O P1.5 with alternate functions MOSI (SPI0), PWM1 output, TIN3 (touch-key input), UCC2 (USB type-C configuration channel) and AIN2 (ADC input); as an analog input it must be set to high-impedance input or open-drain output high with pull-ups disabled."
      },
      {
        "number": "4",
        "name": "P1.6/MISO/RXD1/TIN4",
        "type": "bidirectional",
        "description": "General-purpose I/O P1.6 with alternate functions MISO (SPI0), RXD1 (UART1 receive) and TIN4 (touch-key input); it is the default MISO pin for in-circuit programming."
      },
      {
        "number": "5",
        "name": "P1.7/SCK/TXD1/TIN5",
        "type": "bidirectional",
        "description": "General-purpose I/O P1.7 with alternate functions SCK (SPI0 clock), TXD1 (UART1 transmit) and TIN5 (touch-key input); it is the required SCK pin for in-circuit programming."
      },
      {
        "number": "6",
        "name": "RST/T2EX_/CAP2_",
        "type": "input",
        "description": "External reset input, active high, with an internal pull-down resistor; a reset requires a high level longer than Trst (70 ns minimum) and is only enabled when the En_RST_RESET configuration bit is set."
      },
      {
        "number": "7",
        "name": "P1.0/T2/CAP1/TIN0",
        "type": "bidirectional",
        "description": "General-purpose I/O P1.0 with alternate functions T2 (Timer2 external count input/clock output), CAP1 (Timer2 capture input 1) and TIN0 (touch-key input)."
      },
      {
        "number": "8",
        "name": "P1.1/T2EX/CAP2/TIN1/VBUS2/AIN0",
        "type": "bidirectional",
        "description": "General-purpose I/O P1.1 with alternate functions T2EX (Timer2 reload/capture input), CAP2 (Timer2 capture input 2), TIN1 (touch-key input), VBUS2 (USB type-C bus voltage detect input) and AIN0 (ADC input); as an analog input it must be set to high-impedance input or open-drain output high."
      },
      {
        "number": "9",
        "name": "P3.1/PWM2_/TXD",
        "type": "bidirectional",
        "description": "General-purpose I/O P3.1 with alternate functions PWM2_ output and TXD (UART0 serial data output)."
      },
      {
        "number": "10",
        "name": "P3.0/PWM1_/RXD",
        "type": "bidirectional",
        "description": "General-purpose I/O P3.0 with alternate functions PWM1_ output and RXD (UART0 serial data input)."
      },
      {
        "number": "11",
        "name": "P3.3/INT1",
        "type": "bidirectional",
        "description": "General-purpose I/O P3.3 with alternate function INT1 (external interrupt 1 input)."
      },
      {
        "number": "12",
        "name": "P3.4/PWM2/RXD1_/T0",
        "type": "bidirectional",
        "description": "General-purpose I/O P3.4 with alternate functions PWM2 output, RXD1_ (UART1 receive) and T0 (Timer0 external input)."
      },
      {
        "number": "13",
        "name": "P3.5/T1",
        "type": "bidirectional",
        "description": "General-purpose I/O P3.5 with alternate function T1 (Timer1 external input)."
      },
      {
        "number": "14",
        "name": "P3.6/UDP",
        "type": "bidirectional",
        "description": "General-purpose I/O P3.6 with alternate function UDP (USB D+); it uses V33 as I/O supply so high output can only reach V33 and it is not 5V tolerant, and no series resistor may be placed on it when used for USB."
      },
      {
        "number": "15",
        "name": "P3.7/UDM",
        "type": "bidirectional",
        "description": "General-purpose I/O P3.7 with alternate function UDM (USB D-); it uses V33 as I/O supply so high output can only reach V33 and it is not 5V tolerant, and no series resistor may be placed on it when used for USB."
      },
      {
        "number": "16",
        "name": "P1.3/XO/TXD_",
        "type": "bidirectional",
        "description": "General-purpose I/O P1.3 with alternate functions XO (external crystal inverting output, used when the external oscillator is enabled) and TXD_ (UART0 alternate transmit)."
      },
      {
        "number": "17",
        "name": "P1.2/XI/RXD_",
        "type": "bidirectional",
        "description": "General-purpose I/O P1.2 with alternate functions XI (external crystal input, or external clock input) and RXD_ (UART0 alternate receive)."
      },
      {
        "number": "18",
        "name": "GND/VSS",
        "type": "power_in",
        "description": "Common ground (VSS) for the device."
      },
      {
        "number": "19",
        "name": "VCC/VDD",
        "type": "power_in",
        "description": "Power supply input for the device, which requires an external 0.1uF decoupling capacitor; the VCC pin is specified for an external voltage of 3V to 5V, and the absolute maximum rating is -0.4 V to 5.8 V."
      },
      {
        "number": "20",
        "name": "V33",
        "type": "power_out",
        "description": "Output of the internal USB power regulator (3.3V) and input for the internal USB power; connect to VCC when the supply is below 3.6V, or decouple with at least 0.1uF to GND when the supply is above 3.6V."
      }
    ],
    "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: V33 is documented both as an internal regulator output and as an input that must be tied to VCC when; P3.6/P3.7 are powered from V33 and are not 5V tolerant (high level limited to V33); this limit is re; These pins carry analog (ADC/comparator) functions; the datasheet requires the pin be high-impedance"
        ],
        "pages_sent": 48,
        "cost_usd": 0.2891,
        "at": "2026-10-18T00:34:12"
      },
      "datasheet": {
        "url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8618866389520302080",
        "pages": 53,
        "sha256": "b3995c47a6c00a9f",
        "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": "ch552t.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": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      },
      {
        "file": "ch552t-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": "7fad5c8c1deba44bb6591234d5d4e172725250ba23e6b9be763a10fe38212c21",
        "checked": "2026-10-18",
        "checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
      }
    ]
  }
}