This manual describes the CN-0172, a 3-channel thermocouple temperature measurement system with 0.25°C accuracy designed for process control and industrial…
The CN-0172 is a reference design for a 3-channel thermocouple temperature measurement system with an accuracy of 0.25°C. It is designed for process control and industrial automation applications, providing a high-precision, multi-channel thermocouple measurement solution. The design includes detailed documentation, complete design and integration files, and factory-tested evaluation hardware to accelerate product development and reduce design risk.
The circuit utilizes the AD7793, a 3-channel, low-noise, low-power, 24-bit Sigma-Delta ADC with integrated instrumentation amplifiers and a reference voltage source, to measure thermocouple voltages. For cold junction compensation, the design employs the ADT7320, a precision 16-bit digital SPI temperature sensor with ±0.25°C accuracy over a temperature range of -20°C to +105°C. Both devices are controlled via the SPI interface using the System Demonstration Platform (EVAL-SDP-CB1Z). This manual is written in Chinese.
| Accuracy | 0.25°C |
|---|---|
| Channels | 3-channel |
| ADC Resolution | 24-bit |
| Temperature Sensor Accuracy | ±0.25°C |
| Temperature Range | -20°C to +105°C |
| Resolution | 0.0078°C |
The system provides an accuracy of 0.25°C.
The design uses the AD7793, a 3-channel, low-noise, low-power, 24-bit Sigma-Delta ADC.
Cold junction compensation is achieved using the ADT7320 precision 16-bit digital SPI temperature sensor.
The ADT7320 operates with ±0.25°C accuracy from -20°C to +105°C.