Infineon’s Tiny DPS368 Barometric Pressure Sensor Shuns Water, Dust and Humidity

June 3, 2019 Alix Paultre

Infineon Technologies’ XENSIV DPS368 miniaturized digital barometric pressure sensor is capable of measuring both pressure and temperature, with a precision of ±2 cm. Offering a low current consumption, the DPS368 suits mobile applications and wearable devices, and can be used in home appliances for airflow control, in drones for flight stability, and in medical devices such as smart inhalers.

The sensor can withstand 50m under water for one hour (IPx8) and is protected against dust and humidity, in an 8-pin LGA package measuring 2.0 x 2.5 x 1.1 mm³. The pressure sensor element is based on a capacitive sensing principle, with high precision even during temperature changes. The internal signal processor converts the output from the pressure and temperature sensor elements to 24-bit results. Calibration coefficients stored in the sensor are used in the application to convert the measurement results to high accuracy pressure and temperature values. DPS368 provides quick feedback due to a measurement rate of up to 200 Hz and fast read-out speed. The integrated FIFO memory can save up to 32 measurement results, allowing for power-savings on system level.

The XENSIV DPS368 sensor features an average low power consumption of 1.7 μA for pressure measurements at 1 Hz sampling rate. In standby mode, this is reduced to 0.5 μA. The sensor operates at pressure ranges from 300 to 1200 hPa and temperature ranges from -40 to +85 °C with a temperature accuracy of ±0.5 °C. Sensor measurements and calibration coefficients are available through the serial I²C or SPI interface.

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