SparkFun Thermocouple Breakout - MAX31855K

The SparkFun MAX31855K Thermocouple Breakout is a highly efficient, SPI-compatible, serial interface thermocouple digitizer that allows for precise temperature readings. Its 14-bit resolution enables it to interpret a wide range of temperatures. The device operates by creating a temperature gradient between two wires of different metals. This generates a voltage potential, allowing current to flow. The Thermocouple Breakout interprets this data and translates it into readable form with the help of a standard Type-K thermocouple.

Through the SparkFun Thermocouple Breakout, you can read temperatures ranging from -200°C to +700°C at the thermocouple's hot junction, with an accuracy of ±2°C. The cold junction, located inside the MAX31855K, offers a range from -20°C to +85°C, also maintaining ±2°C accuracy. The device continuously measures the temperature of the cold junction with an internal temperature-sensing diode. It requires a power source from +3.0V to +3.6V (+3.0V nominal) and draws a maximum of 1.5mA.

The Thermocouple Breakout is designed to accommodate a standard thermocouple connector, offering convenience and compatibility with probes you may already possess. Alternatively, you can solder a thermocouple directly into the through-holes labeled '+' and '-'. If you choose this option, it is recommended to mount the thermocouple for strain relief to prevent wire breakage. Notches for a zip-tie or wire wrapping are provided in the PCB opposite the header for this purpose.

Key Features:

• 14-bit Resolution
• SPI-Compatible, Serial Interface
• -200°C to +700°C Temperature Reading with ±2°C Accuracy
• 3.0V to 3.6V (+3.0V nominal) Power Requirement
• Compatible with Type-K Thermocouple

Supporting Documents:

• Schematic
• Eagle Files
• Hookup Guide
• Datasheet (MAX31855K)
• GitHub (Design Files)
• GitHub (Library & Example Code)