The MAX6675 is a complex monolithic thermocouple digitizer with a signal conditioning amplifier, 12-bit analog/digital thermocouple converter, cold junction compensation sensing and correction, digital controller, 1 SPI compatible interface and 1 Related logic control.
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- inputs are connected to the low noise amplifier A1 to ensure high accuracy of the sense input while allowing the thermocouple to connect wires and sources of interference. isolation.
The thermoelectric potential of the thermocouple output is amplified by the low noise amplifier A1, buffered by the A2 voltage follower, and sent to the input of the ADC. Before converting the temperature and voltage values ??to equal temperature values, 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 0°C reference.
The function of the thermocouple is to detect the difference between the temperature of the hot and cold ends, and the temperature of the thermocouple hot node can vary from 0 °C to 1023.75 °C. The cold junction is the temperature around the board on which the MAX6675 is installed. This temperature varies from 20°C to 85°C. When the cold junction temperature fluctuates, the MAX6675 still accurately detects the temperature change at the hot end
The MAX6675 senses and corrects ambient temperature changes with cold junction compensation. The device converts ambient temperature to an internal temperature sensing diode to a temperature-compensated voltage. To produce actual thermocouple temperature measurements, the MAX6675 outputs the thermocouple from the thermocouple. The output measures the voltage. The device's internal circuitry sends the diode voltage and thermocouple voltage to the ADC.
Description
Features:
1. Simple SPI serial port temperature value output
Temperature range from 2.0°C to 1024°C, converter temperature resolution is 0.25°C
3. On-chip cold-to-end compensation
4. High impedance differential input
5. Thermocouple disconnection detection
6. Working voltage range: 3.0V ~ 5.5V
7. Working current: 50mA
8. Operating temperature range: -20 ° C ~ 85 ° C
9. Module interface: GND VCC SCK CS DO
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