MAX31865：RTD-to-Digital Converter _ BDTIC a Leading Distributor in China

MAX31865：RTD-to-Digital Converter

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

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 ±45V. Programmable detection of RTD and cable open and short conditions is included.

Key Features

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 VREF 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)

MAX31865: Block Diagram

Applications/Uses

Industrial Equipment
Instrumentation
Medical Equipment

DataSheet

title	Download file
MAX31865 Data Sheet	MAX31865.pdf

Parametrics

Part Number	Sensor Type	Functions	Interface	Channels	Accuracy (±°C)	Parasite Pwr.	Temp. Resolution (bits)	Oper. Temp. (°C)	Package/Pins	Budgetary Price
Part Number	Sensor Type	Functions	Interface	Channels	Accuracy (±°C)	Parasite Pwr.	Temp. Resolution (bits)	Oper. Temp. (°C)	Package/Pins	See Notes
MAX31865	Remote	RTD-to-Digital Converter Thermistor-to-Digital Converter	SPI	One	0.5	No	15	-40 to +125	SSOP/20 TQFN/20	$3.00 @1k

Design kits & evaluation modules

Quality and Environmental Data

MAX31865.pdf

Ordering Information

Part Number	Status	Package	Temp	RoHS
MAX31865AAP+	Active	SSOP,;20 pin;57.9 mm²	-40°C to +125°C	Lead Free
MAX31865AAP+T	Active	SSOP,;20 pin;57.9 mm²	-40°C to +125°C	Lead Free
MAX31865ATP+	Active	TQFN,;20 pin;26 mm²	-40°C to +125°C	Lead Free
MAX31865ATP+T	Active	TQFN,;20 pin;26 mm²	-40°C to +125°C	Lead Free