Simplifies Thermocouple Designs with Integrated Automatic Cold Junction Compensation and Linearization Correction
The MAX31856 performs cold-junction compensation and digitizes the signal from any type of thermocouple. The output data is formatted in degrees Celsius. This converter resolves temperatures to 0.0078125°C, allows readings as high as +1800°C and as low as -210°C (depending on thermocouple type), and exhibits thermocouple voltage measurement accuracy of ±0.15%. The thermocouple inputs are protected against overvoltage conditions up to ±45V. A lookup table (LUT) stores linearity correction data for several types of thermocouples (K, J, N, R, S, T, E, and B). Line frequency filtering of 50Hz and 60Hz is included, as is thermocouple fault detection. A SPI-compatible interface allows selection of thermocouple type and setup of the conversion and fault detection processes.
title | Download file |
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MAX31856 Data Sheet | MAX31856.pdf |
Part Number | Sensor Type | Functions | Interface | Channels | Accuracy (±°C) | Parasite Pwr. | Temp. Resolution (bits) | Oper. Temp. (°C) | Package/Pins | Budgetary Price |
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See Notes | ||||||||||
MAX31856 | Remote | Thermocouple-to-Digital Converter | 3-Wire/SPI | One | 1.5 | No | 19 | -55 to +125 | TSSOP/14 | $3.80 @1k |
Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
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MAX31856MUD+ | Active | TSSOP,;14 pin;33.4 mm² | -55°C to +125°C | Lead Free | |
MAX31856MUD+T | Active | TSSOP,;14 pin;33.4 mm² | -55°C to +125°C | Lead Free | |
MAX31856PMB1# | Active | EVKIT; | 0°C to +70°C | See data sheet |