MAX31865

PRODUCTION

RTD-to-Digital Converter

Complete Solution Provides a Digital Temperature Reading from an RTD with Fault Detection and Input Voltage Protection

Data Sheet (Rev. 3) Product Selection Table

Part Models: 4
1ku List Price: Starting From $3.93

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Part Details

Integration Lowers System Cost, Simplifies Design Efforts, and Reduces Design Cycle Time
- Simple Conversion of Platinum RTD Resistance to Digital Value
- Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs (PT100 to PT1000)
- Compatible with 2-, 3-, and 4-Wire Sensor Connections
- SPI-Compatible Interface
- 20-Pin TQFN and SSOP Packages
High Accuracy Facilitates Meeting Error Budgets
- 15-Bit ADC Resolution; Nominal Temperature Resolution 0.03125°C (Varies Due to RTD Nonlinearity)
- Total Accuracy Over All Operating Conditions: 0.5°C (0.05% of Full Scale) max
- Fully Differential V_REF Inputs
- 21ms (max) Conversion Time
Integrated Fault Detection Increases System Reliability
- ±45V Input Protection
- Fault Detection (Open RTD Element, RTD Shorted to Out-of-Range Voltage, or Short Across RTD Element)

Part Models: 4
1ku List Price: Starting From $3.93

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX31865AAP+	20-SSOP-5.3_MM	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX31865AAP+T	20-SSOP-5.3_MM	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX31865ATP+	20-LFCSP-5X5X0.75	Material Declaration Reliablity Data	Ultra Librarian SamacSys
MAX31865ATP+T	20-LFCSP-5X5X0.75	Material Declaration Reliablity Data	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

Device Drivers 2

Can't find the software or driver you need?

Tools & Simulations

Software Development 3

IBIS Model 1

MAX31865 IBIS Model

Evaluation Kits

Evaluation Kit for the MAX31865

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Features and Benefits

Easy Evaluation of the MAX31865
Fully Assembled and Tested
USB HID Interface
EV Kit Hardware is USB Powered (USB Cable Included)
Windows XP®-, Windows Vista®-, and Windows® 7-Compatible Software
RoHS Compliant
Proven PCB Layout

Product Details

The MAX31865 evaluation kit (EV kit) provides the hardware and software (graphical user interface) necessary to evaluate the MAX31865 RTD-to-digital Converter. The EV kit includes a MAX31865ATP+ installed as well as a USB-to-SPI interface.

The USB-to-SPI master section of the EV kit can be used to interact with the MAX31865 EV kit software and exercise the device's functionality.

The evaluation kit does NOT come with an RTD. To evaluate temperature, a user-supplied RTD must be connected. This kit comes out of the box optimized for a PT1000 RTD but other value RTDs may also be evaluated with a change of the external reference resistor.

Applications

Industrial Equipment
Instrumentation
Medical Equipment

Peripheral Module for the MAX31865

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Features and Benefits

Simple Conversion of Platinum RTD Resistance to Digital Value
Handles 100Ω to 1kΩ (at 0°C) Platinum RTDs (PT100 to PT1000)
Compatible with 2-, 3-, and 4-Wire Sensor Connections
6-Pin Pmod-Compatible Connector (SPI)
RoHS Compliant
Proven PCB Layout
Fully Assembled and Tested

Product Details

The MAX31865PMB1 peripheral module (Pmod^™) provides the necessary hardware to interface the MAX31865 RTD-to-digital converter to any system that utilizes Pmod-compatible expansion ports configurable for SPI communication. The IC is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). This module is set up to operate with a PT100 platinum RTD.

For full range accuracies, other RTD types, and detailed information regarding operation of the IC, refer to the MAX31865 IC data sheet.

Applications