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MAX31855 Thermocouple-to-Digital Converter

Key Features

  • Thermocouple Type: Optimized for K-type thermocouples.
  • Temperature Range: Reads temperatures from -200°C to +1350°C with a resolution of 0.25°C.
  • Cold-Junction Compensation: Features on-chip cold-junction compensation.
  • Digital Interface: Offers a SPI-compatible interface for communication with microcontrollers.
  • Fault Detection: Can detect thermocouple open circuits, short circuits, and other fault conditions.

Advanced Functionalities

On-Chip Linearization

  • Contains a built-in linearization table for K-type thermocouples, handling non-linear voltage-to-temperature conversion internally.
  • Provides a linear temperature output across the entire operating range, simplifying external processing requirements.

Cold-Junction Compensation and Linearization

  • Combines cold-junction compensation with linearization to ensure accurate temperature readings at the hot junction, regardless of ambient temperature changes at the cold junction.

Fault Detection and Reporting

  • Detects and reports if the thermocouple is disconnected, enhancing safety and reliability.
  • The device communicates the presence of faults via the serial interface, allowing for intelligent error handling in the user's application.

Electrical Characteristics

  • Supply Voltage (VCC): From 3.0V to 3.6V for accommodating various system design needs.
  • Low Operating Current: Typically 1.5mA, contributing to power-efficient designs.
  • Sleep Mode: Features a low-power sleep mode with a current draw of typically 10µA, ideal for battery-powered applications.

Communication Interface

  • Serial Interface: Utilizes a standard SPI interface with 14-bit resolution output, making it versatile for a wide range of microcontroller platforms.

Applications

  • Industrial systems requiring robust and accurate temperature measurements.
  • Consumer appliances with temperature control needs.
  • HVAC systems and other environmental monitoring applications.
  • Precision temperature control systems in scientific and medical equipment.

Packaging

  • Available in an 8-pin SOIC package, allowing for compact board designs.

Conclusion

The MAX31855K streamlines the design of temperature sensing systems by incorporating sophisticated features such as on-chip linearization and cold-junction compensation, reducing the complexity and component count of the overall design. It is an ideal solution for applications demanding high-precision temperature measurements with minimal development effort.