MAX6675ISA+ datasheet by Maxim Integrated Products

MAX6675ISA+ Frequently Asked Questions (FAQs)

• What is the recommended thermocouple type for use with the MAX6675ISA+?
  The MAX6675ISA+ is designed to work with K-type thermocouples, but it can also be used with J-type thermocouples with some limitations. Other thermocouple types may not be compatible.
• How do I handle cold junction compensation with the MAX6675ISA+?
  The MAX6675ISA+ has an internal cold junction compensation circuit, but it requires an external resistor (Rfilt) to be connected between the FILT pin and GND to set the cold junction temperature. The value of Rfilt depends on the desired cold junction temperature.
• What is the purpose of the FILT pin on the MAX6675ISA+?
  The FILT pin is used to set the cold junction temperature and to filter out noise from the thermocouple signal. It is connected to an external resistor (Rfilt) to set the cold junction temperature, and a capacitor (Cfilt) to filter out high-frequency noise.
• How do I convert the digital output of the MAX6675ISA+ to a temperature reading?
  The MAX6675ISA+ outputs a 12-bit digital signal that represents the thermocouple temperature. To convert this to a temperature reading, you need to use a lookup table or a thermocouple temperature conversion formula, taking into account the thermocouple type and the cold junction temperature.
• What is the maximum temperature range of the MAX6675ISA+?
  The MAX6675ISA+ can measure temperatures from -200°C to +1024°C, but the maximum temperature range depends on the thermocouple type and the specific application. For K-type thermocouples, the maximum temperature range is typically around 1260°C.