MAX31855 Thermocouple Converter

{
  "schema_version": 1,
  "type": "component",
  "slug": "max31855",
  "title": "MAX31855 Thermocouple Converter",
  "brief": "Cold-junction compensated thermocouple-to-digital converter with 14-bit SPI output.",
  "version": "0.1.0",
  "license": "CC-BY-SA-4.0",
  "tags": [
    "thermocouple",
    "temperature",
    "spi",
    "cold-junction",
    "adi",
    "soic-8"
  ],
  "component": {
    "mpn": "MAX31855",
    "manufacturer": "Analog Devices",
    "package": "SOIC-8",
    "pin_count": 8,
    "category": "Sensor",
    "subcategory": "Thermocouple Interface",
    "datasheet": "https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31855.pdf",
    "parts": {
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    "distributor_links": {},
    "pins": [
      {
        "number": "1",
        "name": "GND",
        "type": "power_in",
        "description": "Ground reference. Connect to system ground; a large ground plane improves temperature-measurement accuracy."
      },
      {
        "number": "2",
        "name": "T-",
        "type": "input",
        "description": "Negative thermocouple input (see Table 1 for wire type per part suffix). Do NOT connect to GND. Recommend a 10nF differential capacitor across T+/T- for noise filtering."
      },
      {
        "number": "3",
        "name": "T+",
        "type": "input",
        "description": "Positive thermocouple input (see Table 1 for wire type per part suffix). Bias current -100nA to +100nA at 100mV across inputs."
      },
      {
        "number": "4",
        "name": "VCC",
        "type": "power_in",
        "description": "Power-supply voltage input, 3.0V to 3.6V (3.3V typical). Bypass to GND with a 0.1µF ceramic capacitor placed close to the pin. ICC ≈ 900µA typical, 1500µA max."
      },
      {
        "number": "5",
        "name": "SCK",
        "type": "input",
        "description": "SPI serial-clock input, up to 5MHz. Minimum high/low pulse width 100ns; rise/fall ≤ 200ns."
      },
      {
        "number": "6",
        "name": "CS",
        "type": "input",
        "description": "Active-low chip-select input. Drive CS low to enable the serial interface and clock out 32 bits of thermocouple + reference-junction data on SO."
      },
      {
        "number": "7",
        "name": "SO",
        "type": "output",
        "description": "SPI serial-data output (MISO). Read-only 32-bit frame containing 14-bit thermocouple temperature, fault bit, 12-bit internal cold-junction temperature, and SCV/SCG/OC fault bits. VOH ≥ VCC-0.4V at IOUT=-1.6mA; VOL ≤ 0.4V at IOUT=1.6mA."
      },
      {
        "number": "8",
        "name": "DNC",
        "type": "unconnected",
        "description": "Do Not Connect. Leave floating."
      }
    ],
    "provenance": {
      "extractor": "ds2sf",
      "datasheet": {
        "url": "https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31855.pdf",
        "pages": 13,
        "sha256": "0da8c21e66d26950",
        "source_tier": "mfr"
      },
      "cad": "KiCad official (CC-BY-SA 4.0)",
      "pins": {
        "total": 8,
        "described": 8,
        "cites_pages": true,
        "refuses_to_fabricate": true
      }
    },
    "viewers": {
      "symbol": "viewers/symbol.html",
      "footprint": "viewers/footprint.html"
    }
  },
  "metadata": {
    "specs": {
      "Type": "Thermocouple-to-digital converter",
      "Thermocouple (this variant)": "K-type (family: J/N/T/S/R/E/K)",
      "Resolution": "14-bit, 0.25 C",
      "Temperature range": "-270 C to +1800 C (type dependent)",
      "Cold-junction compensation": "Internal",
      "Interface": "SPI (read-only)",
      "Fault detection": "Open, short-to-GND, short-to-VCC",
      "Supply voltage": "3.0 V to 3.6 V"
    }
  },
  "sections": [
    "hero",
    "viewers",
    "readme",
    "breadcrumbs",
    "info"
  ],
  "discovery_triggers": [
    "thermocouple amplifier",
    "K-type thermocouple",
    "high-temperature sensing",
    "thermocouple to digital"
  ],
  "discovery_pitch": "Read a thermocouple straight into an MCU over SPI, with cold-junction compensation and fault detection built in.",
  "author": {
    "name": "Ray",
    "email": "[email protected]"
  },
  "dependencies": {},
  "hero": {
    "type": "image",
    "path": "docs/hero.png"
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  "variants": [
    {
      "mpn": "MAX31855KASA+",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855KASA+T",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855JASA+",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855JASA+T",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855NASA+",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855NASA+T",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855SASA+",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855SASA+T",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855TASA+",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855TASA+T",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855EASA+",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855EASA+T",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855RASA+",
      "kind": "unknown"
    },
    {
      "mpn": "MAX31855RASA+T",
      "kind": "unknown"
    }
  ]
}