Industrial Sensor Interface Solution

The HGSEMI Industrial Sensor Interface Solution supports various sensor types including: RTDs (PT100, PT1000, PT500) for temperature measurement

Thermocouples (J, K, T, E, N, S, R, B types) with cold junction compensation

Strain gauges and load cells for force/weight measurement

4-20mA current loop sensors

0-10V voltage output sensors

and Resistance-based sensors. The flexible design can be adapted for different sensor characteristics by adjusting component values and configuration.

Contact our FAE team with your specific sensor type and requirements for customized interface design recommendations.

Ensuring accuracy over temperature requires several design considerations: Use precision resistors with low temperature coefficient (25ppm/°C or better) in the signal path

Select op-amps with low offset drift (μV/°C range)

Implement temperature compensation for sensor non-linearity

Use voltage references with low temperature drift

and Perform calibration at multiple temperature points. The HG358 op-amp has excellent temperature stability, and proper PCB layout with thermal considerations helps maintain accuracy.

For highest accuracy requirements, contact our FAE team for temperature compensation techniques and calibration procedures.

The Industrial Sensor Interface Solution supports multiple isolation options: Magnetic isolation using transformers for power and signal

Optocouplers for digital signals like RS-485 communication

Capacitive isolation for high-speed data

and Isolated DC-DC converters for power supply isolation. Isolation voltage ratings from 1000Vrms to 5000Vrms are available depending on application requirements. Isolation provides safety protection, breaks ground loops, and improves noise immunity in industrial environments.

Select isolation level based on safety requirements and system grounding. Contact our FAE team for isolation design recommendations.

Industrial transient protection requires multiple layers: Input protection using TVS diodes to clamp overvoltage transients

Series resistors to limit current

RC filters to suppress high-frequency noise

Gas discharge tubes or varistors for high-energy surges

and Proper PCB layout with guard rings and isolation barriers. The HGSEMI solution includes recommended protection circuits that meet IEC 61000-4-5 surge immunity requirements. Always follow proper grounding practices and use shielded cables for sensor connections.

For harsh industrial environments, implement comprehensive protection. Contact our FAE team for protection circuit design guidelines.

The HGSEMI Industrial Sensor Interface Solution can be adapted for SIL (Safety Integrity Level) rated applications with appropriate design considerations. For SIL 2 or SIL 3 applications, redundant sensor channels with comparison logic are typically required. The solution supports redundant architectures using multiple HG358 op-amp channels. Additional diagnostics and watchdog circuits can be implemented using HGSEMI logic devices. Contact our functional safety experts for SIL-rated design support and certification assistance.

For safety-critical applications, contact our FAE team for SIL-rated design support and documentation.

The Industrial Sensor Interface Solution requires calibration for highest accuracy. For RTD interfaces, calibrate at 0°C (ice point) and 100°C (boiling point) minimum. For thermocouples, cold junction compensation calibration is needed. For 4-20mA loops, zero and span calibration at minimum. The HG358 op-amp's low offset drift minimizes recalibration frequency - typically once per year is sufficient for industrial applications. Calibration can be performed digitally through the MCU or with trim potentiometers.

Plan for initial calibration and periodic recalibration. Contact our FAE team for calibration procedures and software support.