Why Infineon Sensors for Industrial IoT

Industrial IoT systems demand sensors that combine high accuracy with robustness in harsh environments -- vibration, temperature extremes, electromagnetic interference, and humidity that would quickly degrade consumer-grade components. Infineon's XENSIV sensor portfolio addresses these requirements with devices covering current sensing, magnetic position, barometric pressure, radar, and inertial measurement. Each product line leverages Infineon's process expertise in silicon and silicon-on-insulator (SOI) technology to deliver sensor ICs that maintain calibration over the full automotive or industrial temperature range without factory trimming by the end user.

This application note focuses on two sensor families that BeiLuo stocks in volume and recommends most frequently: the TLI4966G dual-channel differential Hall-effect current sensor for motor current measurement, and the DPS310 digital barometric pressure sensor for altitude and environmental monitoring. Both devices are suitable for industrial IoT gateways, smart factory equipment, and automotive-adjacent applications requiring IEC 61000-4 electromagnetic compatibility.

TLI4966G Dual-Channel Hall-Effect Current Sensor

The Infineon TLI4966G is a dual-channel coreless Hall-effect current sensor designed for accurate, isolated current measurement in motor drives and power converters. Unlike shunt-based current measurement that introduces insertion loss and requires differential amplification, the TLI4966G senses the magnetic field generated by the current-carrying bus bar or PCB trace, providing galvanic isolation between the high-power circuit and the MCU's ADC input. This eliminates common-mode voltage concerns and simplifies the analog interface significantly.

The TLI4966G integrates two independent sensing channels that can be connected in a differential configuration to cancel stray magnetic fields from nearby conductors, a critical advantage in densely populated motor-drive PCBs where three-phase current paths run in close proximity. Each channel produces a ratiometric analog output voltage proportional to sensed current, making it compatible with any 12-bit or higher ADC without level shifting. The sensitivity can be configured by adjusting the primary conductor distance from the sensor die, allowing the same IC to cover current ranges from a few amperes to several hundred amperes by changing the busbar geometry.

TLI4966G Interface and MCU Integration

Integrating the TLI4966G with an Infineon XMC or AURIX MCU involves routing the analog output to a dedicated ADC channel and synchronizing ADC sampling with the PWM zero-crossing to capture the average current rather than the instantaneous ripple. The TLI4966G's output settles within 2 microseconds of a current step, which is fast enough for current-loop bandwidth requirements up to 10 kHz in a field-oriented control algorithm.

Power-supply decoupling for the TLI4966G follows standard analog supply practice: place a 100 nF ceramic capacitor as close as possible to the VCC and GND pins, and add a 10 uF bulk capacitor at the local supply rail. The device operates from 3.3 V or 5 V, allowing direct supply from either the MCU logic rail or a dedicated 5 V rail for better noise isolation. BeiLuo recommends using separate supply routing for the TLI4966G and the digital MCU circuitry, with a ferrite bead on the shared power rail to attenuate high-frequency switching noise from the inverter stage.

DPS310 Barometric Pressure Sensor for Environmental Monitoring

The Infineon DPS310 is a compact, ultra-low-power barometric pressure and temperature sensor packaged in a 2 mm by 2.5 mm LGA footprint. It measures absolute pressure in the range of 300 hPa to 1200 hPa with a precision of plus or minus 0.002 hPa in high-resolution mode, corresponding to altitude resolution below 20 centimeters. Temperature measurement accuracy of plus or minus 0.5 degrees Celsius over the full operating range enables precise altitude calculations using the international standard atmosphere equations without separate temperature compensation hardware.

The DPS310 communicates via SPI or I2C at clock rates up to 3.4 MHz, and it integrates a FIFO buffer that stores up to 32 pressure and temperature measurement results. This FIFO enables the host MCU to sleep between measurement batches, reducing system power to levels below 1 mW in applications that sample at 1 Hz. An interrupt output notifies the MCU when the FIFO reaches a configurable threshold, eliminating polling overhead entirely.

DPS310 Applications in Industrial IoT

Beyond weather station and drone altitude applications, the DPS310 finds a useful niche in industrial IoT for machine-health monitoring. Compressed-air leaks in pneumatic systems generate pressure transients that the DPS310 can detect at sub-second sampling intervals. HVAC system commissioning tools use the DPS310 to measure differential pressure across filters and heat exchangers. Elevator controllers use barometric pressure to cross-check floor-position estimates derived from encoder counts, catching pulley slip events that would otherwise go undetected until a floor misalignment becomes a safety concern.

Combining the DPS310 with an Infineon MCU such as the XMC4700 creates a self-contained environmental monitoring node. The XMC4700's I2C peripheral operates in interrupt-driven mode, waking the CPU only when DPS310 data is ready. A USB or CAN interface carries processed data to a central gateway. BeiLuo stocks the DPS310 in both tape-and-reel and cut-tape formats, with a typical lead time of two to four days for sample quantities.

Sensor Calibration Strategies

Both the TLI4966G and DPS310 include internal calibration coefficients stored in on-chip non-volatile memory and loaded automatically at power-on. For the DPS310, the datasheet provides the coefficient formulas for converting raw ADC counts to calibrated pressure and temperature values. An implementation of these formulas in C or Python takes approximately 50 lines of code and can be verified against the reference output values provided in the datasheet appendix.

For the TLI4966G, the main calibration task involves determining the zero-current offset of each channel, which shifts slightly with temperature due to stress in the IC package. BeiLuo recommends performing a zero-current calibration at power-on before enabling the motor drive, storing the offset in MCU RAM, and subtracting it from subsequent measurements in the current-control loop. If the application must survive power-cycling without a startup calibration opportunity, the offset can be characterized across temperature and stored in MCU flash as a look-up table indexed by thermistor reading.

BeiLuo Sensor Support and Availability

BeiLuo maintains authorized inventory of TLI4966G and DPS310 in standard production reels and is able to provide cut-tape quantities as low as five pieces for engineering samples. Our FAE team can review your sensor interface schematic, advise on ADC reference voltage selection, and share reference firmware that demonstrates FIFO-based DPS310 acquisition on an XMC4700 starter kit.

For designs combining sensor ICs with an Infineon MCU, refer to our MCU selection guide to choose the correct core and peripheral complement. BeiLuo can provide a consolidated bill-of-materials quote covering the sensor ICs, MCU, and passive components required for a complete sensor node, reducing your sourcing effort and ensuring all components ship on a compatible lead time.

Summary

Infineon XENSIV sensors provide automotive-grade accuracy and robustness for demanding industrial IoT applications. The TLI4966G enables isolated current measurement without insertion loss in motor drives, while the DPS310 delivers sub-centimeter altitude resolution and ultra-low power consumption for environmental monitoring nodes. By following the interface and calibration guidelines in this application note, engineers can integrate both sensors into MCU-based designs with high confidence in measurement accuracy and long-term reliability. BeiLuo stocks both devices and offers FAE support to accelerate your sensor integration project from prototype to production.