Overview
The MAX31865ATP+ 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), particularly PT100 through PT1000 types, and also supports thermistors. It integrates a 15-bit analog-to-digital converter (ADC), input protection, a digital controller, and an SPI-compatible interface, making it a comprehensive solution for precise temperature measurements.
Key Specifications
| Parameter | Min | Typ | Max | Units |
|---|---|---|---|---|
| Supply Voltage (VDD) | 3.0 | 3.3 | 3.6 | V |
| Input Logic 0 (VIL) | -0.3 | 0.3 x VDVDD | V | |
| Input Logic 1 (VIH) | 0.7 x VDVDD | VDVDD + 0.3 | V | |
| ADC Resolution | 15 Bits | |||
| Temperature Accuracy | ±0.5°C (0.05% of Full Scale) | °C | ||
| Operating Temperature | -40 | 125 | °C | |
| Conversion Time | 21 ms (max) | ms | ||
| Package Type | 20-Pin TQFN Exposed Pad |
Key Features
- Simple conversion of platinum RTD resistance to digital value, supporting 100Ω to 1kΩ (at 0°C) RTDs.
- Compatible with 2-, 3-, and 4-wire sensor connections.
- SPI-compatible interface for easy communication.
- High accuracy with 15-bit ADC resolution and a nominal temperature resolution of 0.03125°C.
- Integrated fault detection for RTD open, shorted, or out-of-range voltage conditions.
- ±45V input protection against overvoltage faults.
- Fully differential VREF inputs for enhanced precision.
Applications
- Industrial Equipment: Ideal for temperature monitoring in industrial settings where precision and reliability are crucial.
- Medical Equipment: Used in medical devices that require accurate temperature measurements.
- Instrumentation: Suitable for various instrumentation applications where precise temperature data is essential.
Q & A
- What is the MAX31865ATP+ used for?
The MAX31865ATP+ is used as a resistance-to-digital converter, primarily for converting the resistance of platinum RTDs into digital temperature readings. - What types of RTDs does the MAX31865ATP+ support?
The MAX31865ATP+ supports PT100 through PT1000 RTDs and also thermistors. - What is the ADC resolution of the MAX31865ATP+?
The MAX31865ATP+ has a 15-bit ADC resolution. - What is the temperature accuracy of the MAX31865ATP+?
The temperature accuracy is ±0.5°C (0.05% of Full Scale). - What is the operating temperature range of the MAX31865ATP+?
The operating temperature range is -40°C to 125°C. - Does the MAX31865ATP+ have input protection?
Yes, it has ±45V input protection against overvoltage faults. - What interface does the MAX31865ATP+ use for communication?
The MAX31865ATP+ uses an SPI-compatible interface. - Can the MAX31865ATP+ detect faults in the RTD connection?
Yes, it can detect RTD open, shorted, or out-of-range voltage conditions. - What is the conversion time of the MAX31865ATP+?
The conversion time is up to 21 ms. - What package type is the MAX31865ATP+ available in?
The MAX31865ATP+ is available in a 20-Pin TQFN Exposed Pad package.
