MAX6675 영하 온도 측정이 가능한 온도 센서 모듈 입니다.

CJMCU-6675 MAX6675 thermocouple module temperature sensor K type thermocouple module
CJMCU-MAX6675 is a complex monolithic thermocouple digital converter, the internal signal conditioning amplifier, 12-bit analog / digital converter thermocouple cold junction compensation sensor and correction, digital controller, an SPI compatible interface and an associated control logic.
CJMCU-MAX6675 has internal thermocouple signal is converted to a voltage compatible with the ADC input channel signal conditioning amplifier, T and T- inputs connected to the low noise amplifier A1, to ensure high accuracy detection input, while the connecting wires and thermocouple isolate the source of interference. Thermocouple output of thermoelectric power amplification by a low noise amplifier A1, A2 and then through the voltage follower buffer after being applied to the input of the ADC. Before converting the temperature voltage value to a temperature value equal to the price, the need for thermocouple cold junction temperature compensation, cold junction temperature is the difference between the MAX6675 ambient temperature 0 ℃ actual reference value.
Thermocouple function is to detect hot and cold ends of the temperature difference between the thermocouple hot junction temperature can be 0 ℃ -1023.75 ℃ range. That is the cold side installation CJMCU-MAX6675 board ambient temperature, the temperature is varied within the range of 20 ℃ -85 ℃. When the cold junction temperature fluctuations, temperature MAX6675 able to accurately detect changes in the hot end. MAX6675 is compensated for detecting and correcting ambient temperature changes through the cold end, the device can be ambient temperature detected by the temperature inside the temperature compensation diode is converted to a voltage, in order to generate the actual thermocouple temperature measurements, from the output of the thermocouple and MAX6675 monitor diode the output voltage measurement. The device's internal circuit diode voltage and the thermocouple voltage to the ADC.