MAX31865ATP+

The MAX31865ATP+ is a RTD to digital converter in 20 pin TQFN package. It is an easy to use resistance to digital converter optimized for platinum resistance temperature detectors (RTDs). An external resistor sets the sensitivity for RTD being used and a precision delta sigma ADC converts the ratio of the RTD resistance to reference resistance into digital form. Inputs are protected against overvoltage faults as large as ±45V. Programmable detection of RTD and cable open and short conditions is included. It is used in industrial equipment and instrumentation.

• Supply voltage range is 3V to 3.6V
• Operating temperature range from -40°C to 125°C, high accuracy facilitates meeting error budgets
• Integration lowers system cost, simplifies design efforts and reduces design cycle time
• Simple conversion of platinum RTD resistance to digital value, fully differential VREF inputs
• Handles 100 ohm to 1Kohm (at 0°C) platinum RTDs (PT100 to PT1000), 21ms (max) conversion time
• Compatible with 2-wire, 3-wire and 4-wire sensor connections, SPI-compatible interface
• Fault detection (open RTD element, RTD shorted to out of range voltage or short across RTD element)
• 15bit ADC resolution, nominal temperature resolution 0.03125NC (varies due to RTD nonlinearity)
• Total accuracy over all operating conditions, 0.5NC (0.05% of full scale) max
• Integrated fault detection increases system reliability, ±45V input protection

Applications

Sensing & Instrumentation, Industrial, Medical

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party