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)
Circuit description
The following features of the ADuCM360/ADuCM361 are used in this application:
In the software, a 24-bit ∑-Δ ADC with 32 times PGA gain is configured for the thermocouple and RTD. ADC1 continuously switches between thermocouple signal sampling and RTD voltage signal sampling.
A programmable excitation current source that drives a controlled current through the RTD. The dual channel current source can be configured from 0A to 2mA. This example uses the 200A setting to minimize errors caused by the RTD self-heating effect.
The ADC in the ADuCM360/ADuCM361 has a built-in 1.2V reference. Its internal reference has high accuracy and is suitable for measuring thermocouple voltage.
The ADC in the ADuCM360/ADuCM361 has an external voltage reference. It measures the RTD resistance; it uses a ratiometric setting to connect an external reference resistor (RREF) to the external VREF+ and VREF pins.
Bias Voltage Generator (VBIAS). VBIAS is used to set the thermocouple common mode voltage to AVDD/2.
ARMCortex-M3 core. The powerful 32-bit ARM core integrates 126kB of flash and 8kBSRAM of memory to run user code, configure and control the ADC, handle ADC conversion via RTD, and control UART/USB interface communication.
The UART is used as a communication interface with a host PC.
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