Industrial temperature measurement systems can use the GXSC ADC and FRAM to replace the AD7124/MB85RS128/FM25V01

Industrial temperature measurement is a fundamental component of automated production, environmental monitoring, and smart equipment control. Conventional temperature measurement systems typically consist of an ADC paired with an external operational amplifier, discrete constant-current sources, and Flash memory. However, such systems suffer from issues such as circuit complexity, significant temperature drift, susceptibility to calibration parameter loss, and unstable high-frequency data storage, making it difficult to meet the demands of high-precision industrial temperature measurement.

This article introduces an industrial temperature measurement system based on the GXSC ADC and GXSC ADC. This high-performance solution utilizes a high-precision Σ-Δ ADC as the temperature sensing and acquisition chip and FRAM for data storage. The design significantly simplifies the analog front-end circuitry, resulting in an industrial-grade temperature measurement system that offers high accuracy, strong stability, and long-term maintenance-free operation.

The GXSC ADC features a fully integrated analog front-end design with an effective resolution of 23.5 bits, an output rate of up to 16 kSPS, linearity of <7 ppm, and support for simultaneous 50/60 Hz suppression. The chip incorporates 16-channel analog switches, a low-noise PGA, a low-drift reference source, a highly matched IDAC, and a high-precision 24-bit Σ-Δ ADC. The GXSC ADC integrates multiple functions to reduce system costs and component count in sensor measurement applications. It features a low-noise, programmable-gain amplifier, a single-cycle steady-state digital filter, and an internal oscillator.

The GXSC FRAM is specifically designed for long-term industrial data storage, meeting the high-frequency, frequent, and non-volatile storage requirements of temperature measurement systems. Critical information such as program instructions, parameter configurations, real-time data, and fault logs during system operation is fully retained even under extreme conditions such as sudden power loss or power supply fluctuations.

The GXSC FRAM’s unlimited erase/write cycle lifespan far exceeds the 100,000-cycle limit of Flash memory, supporting frequent, year-round writing of temperature measurement parameters and high-frequency logs without any loss of lifespan. The high-speed SPI interface enables real-time saving of instantaneous temperature data and calibration parameters, preventing data loss during power outages. With an industrial-grade operating temperature range of -40°C to +85°C and extremely low read/write power consumption, it is suitable for battery-powered, unattended long-term monitoring scenarios.

In summary, an industrial temperature measurement system built on GXSC’s high-precision ADC and FRAM chips simplifies the complex analog front-end of traditional RTD temperature measurement while addressing the issues of parameter loss and short lifespan associated with conventional storage solutions. It represents a cost-effective and highly reliable solution for upgrading and optimizing current industrial temperature measurement equipment.