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CJMCU-6675 MAX6675 Thermocouple Type K Thermocouple Module Temperature Sensor Module
Description:
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 logic control.
CJMCU-MAX6675 therein a thermocouple signal is converted to a voltage compatible with the ADC input channel signal conditioning amplifiers, T, and T- input connected to the low noise amplifier A1, to ensure high accuracy detection of input, while the connecting wires and the thermocouple isolate the source of interference. Thermocouple output of thermoelectric power amplification by a low-noise amplifier A1, A2 and then through a voltage follower buffer after being sent to the input of the ADC. Prior to the transition temperature is the temperature value equal to the voltage value price, the need for thermocouple cold junction temperature compensation, ie, the difference between the MAX6675 cold junction temperature 0°C ambient temperature and the actual reference value.
Thermocouple function is to detect hot and cold ends of the temperature difference between the thermocouple hot junction temperature at 0 °C -1023.75°C may vary. Cold end is installed CJMCU-MAX6675 board ambient temperature, the temperature varied within the range of 20°C -85 °C. When the cold junction temperature fluctuations, temperature MAX6675 able to accurately detect changes in the hot end. MAX6675 detection and correction is compensated by changes in ambient temperature of the cold end, the device may be the ambient temperature detected by the temperature inside the temperature compensation diode is converted to a voltage, in order to generate the actual thermocouple measurements, MAX6675 from the output of the thermocouple and the detection diode The output voltage measurement. The device's internal circuitry diode voltage and thermocouple voltage to the ADC.
