Overview
The MAX31865ATP+T is a sophisticated resistance-to-digital converter designed by Analog Devices Inc./Maxim Integrated. This component is optimized for use with platinum resistance temperature detectors (RTDs), specifically supporting PT100 to PT1000 RTDs. It features a built-in 15-bit delta-sigma analog-to-digital converter (ADC), input protection, and a digital controller with an SPI-compatible interface. The MAX31865 is known for its simplicity, high accuracy, and integrated fault detection capabilities, making it a reliable choice for various industrial and medical applications.
Key Specifications
| Parameter | Value |
|---|---|
| Converter Resolution | 15-bit |
| Temperature Measurement Accuracy | ±0.5°C |
| Temperature Resolution | 0.03125°C (nominal) |
| Input Protection | ±45V |
| Conversion Time | 21ms (max) |
| Interface | SPI-compatible |
| Package Type | TQFN20-EP, SSOP |
| Supply Voltage | 3.3V |
| Mounting | SMD |
| RTD Compatibility | 2-, 3-, and 4-Wire Sensor Connections |
Key Features
- 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 for easy communication
- High accuracy with a total accuracy of ±0.5°C over all operating conditions
- Integrated fault detection for RTD and cable open and short conditions
- Fully differential VREF inputs for improved accuracy
- ±45V input protection against overvoltage faults
Applications
- Industrial Equipment
- Medical Equipment
- Instrumentation
Q & A
- What is the MAX31865ATP+T used for? The MAX31865ATP+T is used as a resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs).
- What is the resolution of the ADC in the MAX31865ATP+T? The ADC resolution is 15 bits.
- What is the temperature measurement accuracy of the MAX31865ATP+T? The temperature measurement accuracy is ±0.5°C.
- What types of RTD connections are supported by the MAX31865ATP+T? It supports 2-, 3-, and 4-wire sensor connections.
- What is the interface type of the MAX31865ATP+T? The interface is SPI-compatible.
- What is the maximum conversion time of the MAX31865ATP+T? The maximum conversion time is 21ms.
- Does the MAX31865ATP+T have built-in fault detection? Yes, it includes programmable detection for RTD and cable open and short conditions.
- What is the input protection voltage of the MAX31865ATP+T? The input protection is up to ±45V.
- In what packages is the MAX31865ATP+T available? It is available in TQFN20-EP and SSOP packages.
- What are some common applications of the MAX31865ATP+T? Common applications include industrial equipment, medical equipment, and instrumentation.
