link to page 29 EVALUATION KIT AVAILABLEMAX31856Precision Thermocouple to Digital Converterwith LinearizationGeneral DescriptionBenefits and Features The MAX31856 performs cold-junction compensation ● Provides High-Accuracy Thermocouple Temperature and digitizes the signal from any type of thermocouple. Readings The output data is formatted in degrees Celsius. This • Includes Automatic Linearization Correction for 8 converter resolves temperatures to 0.0078125°C, allows Thermocouple Types readings as high as +1800°C and as low as -210°C • ±0.15% (max, -20 ° C to +85 ° C) Thermocouple Full- (depending on thermocouple type), and exhibits thermo- Scale and Linearity Error couple voltage measurement accuracy of ±0.15%. The • 19-Bit, 0.0078125°C Thermocouple Temperature thermocouple inputs are protected against overvoltage Resolution conditions up to ±45V. ● Internal Cold-Junction Compensation Minimizes A lookup table (LUT) stores linearity correction data for System Components several types of thermocouples (K, J, N, R, S, T, E, and • ±0.7°C (max, -20 ° C to +85 ° C) Cold-Junction B). Line frequency filtering of 50Hz and 60Hz is included, Accuracy as is thermocouple fault detection. A SPI-compatible inter- face allows selection of thermocouple type and setup of ● ±45V Input Protection Provides Robust System the conversion and fault detection processes. Performance ● Simplifies System Fault Management and Applications Troubleshooting ● Temperature Controllers • Detects Open Thermocouples ● Industrial Ovens, Furnaces, and Environmental • Over- and Undertemperature Fault Detection Chambers ● 50Hz/60Hz Noise Rejection Filtering Improves ● Industrial Equipment System Performance Ordering Information appears at end of data sheet. ● 14-Pin TSSOP Package Typical Application Circuit AGND DGND BIAS FAULT 0.01µF SDI T- 0.1µF MAX31856 T+ SDO 0.01µF TO MICROCONTROLLER 3.3V AVDD SCK 0.1µF DNC CS DRDY DVDD 3.3V 0.1µF 19-7534; Rev 0; 2/15
