MAX31865 RTD-to-Digital Converter

MAX31865 RTD-to-Digital Converter

The MAX31865 is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). An external resistor sets the sensitivity for the RTD being used and a precision delta-sigma ADC converts the ratio of the RTD resistance to the reference resistance into di.

Features

S Simple Conversion of Platinum RTD Resistance to Digital Value S Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs (PT100 to PT1000) S Compatible with 2-, 3-, and 4-wire Sensor Connections S Conversion Time: 21ms max S 15-Bit ADC Resolution; Nominal Temperature Resolution 0.03125NC (Varies Due to RTD Nonlinearity) S Total Accuracy Over All Operating Conditions: 0.5NC (0.05% of Full Scale) max S ±0V Input Protection S Fully Differential VREF Inputs S Fault Detection (Open RTD Element, RTD Shorted to Out-of-Range Voltage, or Short Across RTD Element) S SPI-Compatible Interface S 20-Pin TQF.