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Overview The MAX6675 is a complex monolithic thermocouple to digital converter with internal signal conditioning amplifier 12 bit analog digital thermocouple converter cold junction compensation sensing and correction digital controller 1 SPI compatible interface and 1 Related l0gic controls The MAX6675 has a signal conditioning amplifier that converts the thermocouple signal into a voltage compatible with the ADC input channel The T and T input terminals are connected to the low noise amplifier A1 to ensure the accuracy of the detection input At the same time the thermocouple connection wire and interference Source isolation The thermoelectric potential output by the thermocouple is amplified by the low noise amplifier A1 and then buffered by the A2 voltage follower and then sent to the input of the ADC Before the temperature voltage value is converted into an equivalent temperature value the cold junction temperature of the thermocouple needs to be compensated The cold junction temperature is the difference between the temperature around the MAX6675 and the actual reference value of 0 ° C The function of the thermocouple is to detect the temperature difference between the hot and cold ends The temperature of the thermocouple hot node can be changed in the range of 0 ℃ 1023 75 ℃ The cold junction is the temperature around the circuit board on which the MAX6675 is installed and the temperature varies between 20 ° C and 85 ° C When the cold junction t
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