MAX31865 Converter: Datasheet, Pinout and Benefits

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 digital form. The MAX31865’s inputs are protected against overvoltage faults as large as Q45V. Programmable detection of RTD and cable open and short conditions is included.

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Maxim Integrated MAX31865AAP+ technical specifications, attributes, parameters and parts with similar specifications to Maxim Integrated MAX31865AAP+.

• Integration Lowers System Cost, Simplifies Design Efforts, and Reduces Design Cycle Time

1. Simple Conversion of Platinum RTD Resistance to Digital Value
2. Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs (PT100 to PT1000)
3. Compatible with 2-, 3-, and 4-Wire Sensor Connections
4. SPI-Compatible Interface
5. 20-Pin TQFN and SSOP Packages

• High Accuracy Facilitates Meeting Error Budgets

1. 15-Bit ADC Resolution; Nominal Temperature Resolution 0.03125NC (Varies Due to RTD Nonlinearity)
2. Total Accuracy Over All Operating Conditions: 0.5NC (0.05% of Full Scale) max
3. Fully Differential VREF Inputs
4. 21ms (max) Conversion Time

• Integrated Fault Detection Increases System Reliability

1. ±45V Input Protection
2. Fault Detection (Open RTD Element, RTD Shorted to Out-of-Range Voltage, or Short Across RTD Element)

● Industrial Equipment

● Medical Equipment

● Instrumentation

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