14-bit 4-20mA loop-powered thermocouple temperature measurement system circuit

Q3307LC41105900 14

One-piece inductor

This circuit integrates most of the circuit functions into the precision analog microcontroller ADuCM360, including dual 24-bit Σ-Δ ADCs, ARM Cortex TM-M3 processor cores, and 4 for controlling loop voltages up to 28 V. The PWM/DAC feature of the mA to 20 mA loop provides a low cost temperature monitoring solution.

Among them, ADuCM360 is connected to a T-type thermocouple and a 100Ω platinum resistance temperature detector (RTD). RTD is used for cold junction compensation. The low-power Cortex-M3 core converts ADC readings to temperature values. Supported T-type thermocouples have a temperature range of −200°C to +350°C, and this temperature range corresponds to an output current range of 4mA to 20mA.