STC12C5616AD-35I-SOP28

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  "slug": "stc12c5616ad-35i-sop28",
  "title": "STC12C5616AD-35I-SOP28",
  "brief": "STC Micro Microcontrollers (MCU/MPU/SOC), SOIC-28-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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  "component": {
    "mpn": "STC12C5616AD-35I-SOP28",
    "manufacturer": "STC Micro",
    "package": "SOIC-28-300mil",
    "pin_count": 28,
    "category": "Embedded Processors & Controllers",
    "subcategory": "Microcontrollers (MCU/MPU/SOC)",
    "datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588882129120215040",
    "parts": {
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    "distributor_links": {
      "lcsc": "C21461"
    },
    "distributor_check": {
      "checked_at": "2026-10-21T01:01:12Z",
      "source": "Component Ocean /api/assign-pns",
      "digikey": {
        "pn": null,
        "status": "no match"
      },
      "mouser": {
        "pn": null,
        "status": "no match"
      }
    },
    "pins": [
      {
        "number": "1",
        "name": "P2.2",
        "type": "bidirectional",
        "description": "Standard quasi-bidirectional I/O port 2 bit 2 (PORT2[2]), configurable per pin as quasi-bidirectional, push-pull, input-only (high-impedance) or open-drain."
      },
      {
        "number": "2",
        "name": "P2.3",
        "type": "bidirectional",
        "description": "Standard I/O port 2 bit 3 (PORT2[3]), configurable as quasi-bidirectional, push-pull, input-only or open-drain; each I/O sources or sinks up to 20 mA, with the whole chip not to exceed 55 mA per the port-mode section."
      },
      {
        "number": "3",
        "name": "RST",
        "type": "input",
        "description": "Reset input; holding RST high for at least 24 clock cycles plus 10 µs puts the MCU into reset, and it starts from 0000H when RST is pulled low again."
      },
      {
        "number": "4",
        "name": "P3.0/RxD",
        "type": "bidirectional",
        "description": "Standard I/O port 3 bit 0 that doubles as the UART serial data receive input RxD."
      },
      {
        "number": "5",
        "name": "P3.1/TxD",
        "type": "bidirectional",
        "description": "Standard I/O port 3 bit 1 that doubles as the UART serial data transmit output TxD."
      },
      {
        "number": "6",
        "name": "XTAL2",
        "type": "output",
        "description": "Output of the internal clock inverting amplifier for the external crystal; when an external clock drives XTAL1 this pin may be left floating."
      },
      {
        "number": "7",
        "name": "XTAL1",
        "type": "input",
        "description": "Input to the internal clock inverting amplifier for the external crystal, and the external clock input when an external clock source is used directly."
      },
      {
        "number": "8",
        "name": "P3.2/INT0",
        "type": "bidirectional",
        "description": "Standard I/O port 3 bit 2 that doubles as external interrupt 0, triggered by falling edge or low level."
      },
      {
        "number": "9",
        "name": "P3.3/INT1",
        "type": "bidirectional",
        "description": "Standard I/O port 3 bit 3 that doubles as external interrupt 1, triggered by falling edge or low level."
      },
      {
        "number": "10",
        "name": "P3.4/T0/ECI",
        "type": "bidirectional",
        "description": "Standard I/O port 3 bit 4 that doubles as external input of Timer/Counter 0 (T0) and the external pulse input of the PCA counter (ECI)."
      },
      {
        "number": "11",
        "name": "P3.5/T1/PCA1/PWM1",
        "type": "bidirectional",
        "description": "Standard I/O port 3 bit 5 that doubles as external input of Timer/Counter 1 (T1), PCA module 1 output and PWM1 output."
      },
      {
        "number": "12",
        "name": "P2.4/PCA3/PWM3",
        "type": "bidirectional",
        "description": "Standard I/O port 2 bit 4 that doubles as PCA module 3 output and PWM3 output."
      },
      {
        "number": "13",
        "name": "P2.5",
        "type": "bidirectional",
        "description": "Standard I/O port 2 bit 5 (PORT2[5]), configurable as quasi-bidirectional, push-pull, input-only or open-drain."
      },
      {
        "number": "14",
        "name": "Gnd",
        "type": "power_in",
        "description": "Power supply ground (negative supply terminal)."
      },
      {
        "number": "15",
        "name": "P2.6",
        "type": "bidirectional",
        "description": "Standard I/O port 2 bit 6 (PORT2[6]), configurable as quasi-bidirectional, push-pull, input-only or open-drain."
      },
      {
        "number": "16",
        "name": "P2.7",
        "type": "bidirectional",
        "description": "Standard I/O port 2 bit 7 (PORT2[7]), configurable as quasi-bidirectional, push-pull, input-only or open-drain."
      },
      {
        "number": "17",
        "name": "P3.7/PCA0/PWM0",
        "type": "bidirectional",
        "description": "Standard I/O port 3 bit 7 that doubles as PCA module 0 output and PWM0 output."
      },
      {
        "number": "18",
        "name": "P1.0/ADC0/CLKOUT0",
        "type": "bidirectional",
        "description": "Standard I/O port 1 bit 0 that doubles as ADC input channel 0 and Timer 0 clock output CLKOUT0 when T0CLKO is enabled; when used as ADC it must be set to open-drain or input-only mode."
      },
      {
        "number": "19",
        "name": "P1.1/ADC1/CLKOUT1",
        "type": "bidirectional",
        "description": "Standard I/O port 1 bit 1 that doubles as ADC input channel 1 and Timer 1 clock output CLKOUT1 when T1CLKO is enabled; when used as ADC it must be set to open-drain or input-only mode."
      },
      {
        "number": "20",
        "name": "P1.2/ADC2",
        "type": "bidirectional",
        "description": "Standard I/O port 1 bit 2 that doubles as ADC input channel 2; when used as ADC it must be set to open-drain or input-only mode."
      },
      {
        "number": "21",
        "name": "P1.3/ADC3",
        "type": "bidirectional",
        "description": "Standard I/O port 1 bit 3 that doubles as ADC input channel 3; when used as ADC it must be set to open-drain or input-only mode."
      },
      {
        "number": "22",
        "name": "P1.4/ADC4/SS",
        "type": "bidirectional",
        "description": "Standard I/O port 1 bit 4 that doubles as ADC input channel 4 and SPI slave select SS; when used as ADC it must be set to open-drain or input-only mode."
      },
      {
        "number": "23",
        "name": "P1.5/ADC5/MOSI",
        "type": "bidirectional",
        "description": "Standard I/O port 1 bit 5 that doubles as ADC input channel 5 and SPI master-out/slave-in MOSI; when used as ADC it must be set to open-drain or input-only mode."
      },
      {
        "number": "24",
        "name": "P1.6/ADC6/MISO",
        "type": "bidirectional",
        "description": "Standard I/O port 1 bit 6 that doubles as ADC input channel 6 and SPI master-in/slave-out MISO; when used as ADC it must be set to open-drain or input-only mode."
      },
      {
        "number": "25",
        "name": "P1.7/ADC7/SCLK",
        "type": "bidirectional",
        "description": "Standard I/O port 1 bit 7 that doubles as ADC input channel 7 and SPI serial clock SCLK; when used as ADC it must be set to open-drain or input-only mode."
      },
      {
        "number": "26",
        "name": "P2.0/PCA2/PWM2",
        "type": "bidirectional",
        "description": "Standard I/O port 2 bit 0 that doubles as PCA module 2 output and PWM2 output."
      },
      {
        "number": "27",
        "name": "P2.1",
        "type": "bidirectional",
        "description": "Standard I/O port 2 bit 1 (PORT2[1]), configurable as quasi-bidirectional, push-pull, input-only or open-drain."
      },
      {
        "number": "28",
        "name": "VCC",
        "type": "power_in",
        "description": "Positive power supply; the datasheet gives the operating range as 5.5 V to 3.5 V for this 5 V variant."
      }
    ],
    "provenance": {
      "extractor": "extract_pins 0.3",
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        "primary_mode": "text",
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        "guards": "pin_guards 0.1: passed",
        "guard_notes": [
          "extractor flagged: The SOP28 package listing is taken from the pin-description table (columns for SOP28/SKDIP28) and cr; The 300mil body width requested in the package hint is not confirmed. The datasheet only labels the ; P0 port pins (P0.0-P0.3) are not present on the SOP28 package, so no pins are listed for them; this ",
          "2/28 pins cited to the wrong page (name found elsewhere): ['6:XTAL2@p28', '7:XTAL1@p28']"
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        "at": "2026-10-21T00:59:04"
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  "metadata": {
    "specs": {
      "Manufacturer": "STC Micro",
      "Package": "SOIC-28-300mil",
      "Category": "Embedded Processors & Controllers",
      "Pins": "28"
    },
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        "quote": "Accumulator contents and the contents of a sixteen-bit base register, which may be either the Data Pointer or the PC. In the latter case, the PC is incremented to the address of the",
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