Overview
The MAX31855KASA+ is a cold-junction compensated thermocouple-to-digital converter produced by Analog Devices Inc./Maxim Integrated. This device is designed to digitize the signal from various types of thermocouples, including K-, J-, N-, T-, S-, R-, and E-type. It integrates cold-junction compensation, reducing the need for external components and simplifying the design process. The MAX31855KASA+ offers high accuracy and resolution, making it suitable for a wide range of temperature measurement applications.
Key Specifications
| Parameter | Symbol | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|---|
| Thermocouple Temperature Range | TTHERMOCOUPLE | -270°C to +1800°C | -270 | - | 1800 | °C |
| Temperature Resolution | - | - | - | - | 0.25 | °C |
| Cold-Junction Temperature Error | - | TA = -20°C to +85°C | -2 | - | 2 | °C |
| Temperature Conversion Time | tCONV | - | 70 | 100 | ms | |
| Power-Up Time | tCONV_PU | - | - | - | 200 | ms |
| Input Leakage Current | ILEAK | - | -1 | - | 1 | µA |
| Input Capacitance | CIN | - | - | - | 8 | pF |
| Serial-Clock Frequency | fSCL | - | - | - | 5 | MHz |
Key Features
- Integration of cold-junction compensation, reducing design time and system cost.
- Supports K-, J-, N-, T-, S-, R-, and E-type thermocouples.
- High temperature resolution of 0.25°C.
- Temperature range from -270°C to +1800°C.
- Accuracy of ±2°C for temperatures ranging from -200°C to +700°C for K-type thermocouples.
- 14-bit, SPI-compatible, read-only output format.
- Fault detection for open or shorted thermocouple inputs.
Applications
- Industrial temperature measurement.
- Appliance temperature control.
- HVAC systems.
- Automotive temperature sensing.
- Medical devices requiring precise temperature monitoring.
Q & A
- What types of thermocouples does the MAX31855KASA+ support?
The MAX31855KASA+ supports K-, J-, N-, T-, S-, R-, and E-type thermocouples. - What is the temperature resolution of the MAX31855KASA+?
The temperature resolution is 0.25°C. - What is the operating temperature range of the MAX31855KASA+?
The operating temperature range is from -270°C to +1800°C. - How accurate is the MAX31855KASA+ for K-type thermocouples?
The accuracy is ±2°C for temperatures ranging from -200°C to +700°C. - What is the output format of the MAX31855KASA+?
The output is in a 14-bit, SPI-compatible, read-only format. - Does the MAX31855KASA+ have fault detection capabilities?
Yes, it has fault detection for open or shorted thermocouple inputs. - What is the typical conversion time for the MAX31855KASA+?
The typical conversion time is 100 ms. - What is the power-up time for the MAX31855KASA+?
The power-up time is 200 ms. - What is the input leakage current of the MAX31855KASA+?
The input leakage current is ±1 µA. - What is the maximum serial-clock frequency for the MAX31855KASA+?
The maximum serial-clock frequency is 5 MHz.
