Aurasemi Sensor Interface ICs

The AU60xx series provides automatic lead resistance compensation: (1) 3-wire configuration - the device measures lead resistance and subtracts it from the measurement

(2) 4-wire configuration - eliminates lead resistance entirely through Kelvin connection

(3) 2-wire configuration - requires calibration to compensate for known lead resistance. For best accuracy, use 3-wire or 4-wire configurations. The AU6020 supports all three configurations with automatic detection and compensation.

Use 3-wire or 4-wire RTD configuration for automatic lead compensation.

The AU61xx series supports all common thermocouple types: Type K (Chromel-Alumel), Type J (Iron-Constantan), Type T (Copper-Constantan), Type E (Chromel-Constantan), Type N (Nicrosil-Nisil), Type S (Platinum-Rhodium), Type R, and Type B. Each type has built-in linearization tables stored in ROM. The device automatically detects the thermocouple type through pin strapping or register configuration. Cold junction compensation is performed using an integrated temperature sensor with ±0.5°C accuracy.

AU61xx supports all standard thermocouple types with automatic linearization.

Aurasemi sensor interfaces provide high-accuracy measurements: (1) RTD interfaces - ±0.1°C accuracy for Pt100/Pt1000

(2) Thermocouple interfaces - ±0.5°C including CJC error

(3) Bridge interfaces - ±0.01% full scale for strain gauges. Accuracy depends on sensor quality, calibration, and environmental conditions. The devices include self-calibration features and diagnostic functions to maintain accuracy over temperature and time. For highest accuracy, perform system calibration with your specific sensor.

Expect ±0.1°C for RTD, ±0.5°C for thermocouples with proper calibration.

The AU6020 supports programmable conversion rates from 1 SPS to 100 SPS (samples per second). Lower rates provide better noise performance and higher effective resolution through digital filtering. Higher rates enable faster response times for dynamic measurements. At 1 SPS, the device achieves the lowest noise and highest resolution (up to 24 noise-free bits). At 100 SPS, the resolution is typically 18-20 bits. For most industrial temperature monitoring applications, 10-20 SPS provides a good balance of response time and accuracy.

Use 1-10 SPS for highest accuracy; 50-100 SPS for fast response.

The AU6020 supports both factory calibration and user calibration: (1) Factory calibration - each device is calibrated at the factory and stored in OTP memory

(2) User calibration - perform offset and gain calibration using known reference points

(3) System calibration - calibrate with your specific sensor for highest accuracy

(4) Temperature calibration - compensate for temperature drift if operating over wide temperature range. For highest accuracy, perform system calibration at the operating temperature. The device provides registers for storing calibration coefficients.

Use factory calibration for general applications; system calibration for highest accuracy.