MAX31865ATP+T

Product Overview

• Category: Integrated Circuit (IC)
• Use: Temperature sensor interface
• Characteristics: High accuracy, low power consumption
• Package: 20-TQFN (4x4)
• Essence: Maxim Integrated's MAX31865ATP+T is a temperature sensor interface IC designed for resistance temperature detectors (RTDs).
• Packaging/Quantity: Tape and reel packaging, 2500 units per reel

Specifications

• Temperature Range: -200°C to +850°C
• Resolution: 0.0625°C
• Accuracy: ±0.5°C (maximum) from -50°C to +150°C
• Supply Voltage: 3.0V to 3.6V
• Current Consumption: 1.2mA (typical)

Pin Configuration

The MAX31865ATP+T has a 20-pin TQFN package with the following pin configuration:

1. VDD: Power supply input
2. GND: Ground
3. SDO: Serial data output
4. SDI: Serial data input
5. SCLK: Serial clock input
6. CS: Chip select input
7. RREFIN+: Positive reference resistor input
8. RREFIN-: Negative reference resistor input
9. RTDIN+: Positive RTD input
10. RTDIN-: Negative RTD input
11. AIN3: Analog input 3
12. AIN2: Analog input 2
13. AIN1: Analog input 1
14. AIN0: Analog input 0
15. REFOUT: Reference voltage output
16. AVDD: Analog power supply input
17. AGND: Analog ground
18. DVDD: Digital power supply input
19. DGND: Digital ground
20. NC: No connection

Functional Features

• High-resolution ADC: Provides 24-bit resolution for accurate temperature measurement.
• RTD-to-Digital Conversion: Converts resistance changes of the RTD into digital temperature values.
• Linearization and Compensation: Performs linearization and compensation to improve accuracy.
• SPI Interface: Supports serial peripheral interface for communication with microcontrollers.
• Fault Detection: Detects open or short-circuit conditions in the RTD.

Advantages and Disadvantages

Advantages: - High accuracy over a wide temperature range - Low power consumption - Compact package size - Easy integration with microcontrollers

Disadvantages: - Limited temperature range compared to some other temperature sensor ICs - Requires external reference resistors for operation

Working Principles

The MAX31865ATP+T works by measuring the resistance changes of an RTD and converting them into digital temperature values using an internal ADC. It compensates for non-linearities and provides accurate temperature readings. The IC communicates with a microcontroller through the SPI interface, allowing for easy integration into various systems.

Detailed Application Field Plans

The MAX31865ATP+T is commonly used in applications that require precise temperature measurements, such as:

1. Industrial Process Control: Monitoring and controlling temperature in manufacturing processes.
2. HVAC Systems: Temperature sensing and control in heating, ventilation, and air conditioning systems.
3. Medical Equipment: Accurate temperature monitoring in medical devices and laboratory equipment.
4. Automotive: Temperature sensing in automotive engine management systems.
5. Food Industry: Temperature control in food processing and storage.

Detailed and Complete Alternative Models

1. MAX31865PMB1: Evaluation board for MAX31865ATP+T, providing a convenient platform for testing and development.
2. MAX31865EVSYS: Evaluation system for MAX31865ATP+T, including software and hardware components for comprehensive testing and evaluation.
3. MAX31865MUD+: A variant of MAX31865ATP+T with a different package and pin configuration, suitable for specific design requirements.

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