Maxim MAX31855: Cold-Junction Compensated Thermocouple-to-Digital Converter
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Accurate Thermocouple-to-Digital Converter IC Simplifies Designs and Lowerd System Cost
The MAX31855 performs cold-junction compensation and digitizes the signal from a K, J, N, T, or E type ther¬mocouple. (Contact the factory for S and R type thermo¬couples.) The data is output in a signed 14-bit, SPI™- compatible, read-only format. This converter resolves temperatures to 0.25NC, allows readings as high as +1800NC and as low as -270NC, and exhibits thermo¬couple accuracy of ±2NC for temperatures ranging from -200NC to +700NC for K-type thermocouples.
Key Features
- Cold-Junction Compensation
- 14-Bit, 0.25°C Resolution
- Versions Available for K, J, N, T, and E Type Thermocouples (Contact Factory for S and R Types) (see Table 1 in the full data sheet)
- Simple SPI-Compatible Interface (Read-Only)
- Detects Thermocouple Shorts to GND or VCC
- Detects Open Thermocouple
Applications
- Industrial
- Appliances
- HVAC
- Automotive