Circuit diagram of USB thermocouple temperature measurement system using ARM Cortex-M3

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Circuit function and advantage

This circuit shows how to use the precision analog microcontroller ADuCM360/ADuCM361 in precision thermocouple temperature monitoring applications. ADuCM360/ADuCM361 integrates dual 24-bit-to-analog-to-digital converter (ADC), dual programmable current source, 12-bit digital-to-analog converter (DAC), 1.2 V internal reference, ARM Cortex-M3 core, 126 kB Flash, 8 kB SRAM, and various digital peripherals such as UART, timer, SPI, and I2C interface.

In this circuit, the ADuCM360/ADuCM361 is connected to a thermocouple and a 100 platinum resistance temperature detector (RTD). The RTD is used to perform cold junction compensation.

In the source code, the ADC sampling rate is chosen to be 4 Hz. When the ADC input programmable gain amplifier (PGA) has a gain configuration of 32, the ADuCM360/ADuCM361 has a noise-free code resolution greater than 18 bits.

Figure 1. ADuCM360/ADuCM361 is used as a temperature monitoring controller and thermocouple interface (schematic diagram, not shown)

Figure 1. ADuCM360/ADuCM361 is used as a temperature monitoring controller and thermocouple interface (schematic diagram, not shown)
Circuit diagram of USB thermocouple temperature measurement system using ARM Cortex - M3

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