New Barometric Pressure Sensor For IoT Devices

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Pressure sensors are becoming an essential part of mobile and wearable gadgets. According to the press release, Infineon has launched low-power digital barometric pressure sensor based on capacitive principle which guarantees high precision across a broad range of temperatures even when temperature changes rapidly. This is clearly an advantage since the temperature inside a mobile device can change quickly due to several heat sources. Typically, a capacitive pressure sensor contains a thin diaphragm and this same diaphragm is used as the pressure sensing element and the capacitive sensing element as well. In general, the high pressure sensitivity of a capacitive pressure sensor is achieved by increasing diaphragm size, reducing diaphragm thickness and decreasing sensing gap, which results in a large sensor size, non-linearity and limited dynamic range compared to that of typical pressure sensors. Moreover, it has the ability to provide accurate data for calculating elevation gain and vertical speed suits activity tracking in mobile and wearable health and sports gadgets, while ultra-precise pressure measurement opens up new possibilities for gesture recognition and the detection of rapid weather changes.

Referring to the available product brief, “The DPS310 is a miniaturised Digital Barometric Air Pressure Sensor with a high accuracy level and low current consumption. The DPS310 is both a pressure and temperature sensor. The small package makes the DPS310 ideal for mobile applications and wearable devices. The DPS310’s internal signal processor converts the output from the pressure and temperature sensor elements to 24-bit results. Each pressure sensor has been calibrated individually and contains calibration coefficients. The coefficients are used in the application to convert the measurement results to true pressure and temperature values. The sensor has a FIFO that can store the latest 32 measurements. Since the host processor can remain in a sleep mode for a longer period between readouts, a FIFO can reduce the system power consumption.”

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Dr. Roland Helm, Segment Head Sensors at Infineon Technologies said, “Built on proven semiconductor processes and combining ultra-high-resolution, good temperature stability, low-power operation and miniature package size, the DPS310 enables developers to improve the functionality and enhance the user experience in applications ranging from assisted location and navigation through sport and fitness to real-time weather monitoring.”

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Key features of DPS310 pressure sensor as mentioned below:

  • Operation range:
    • Pressure: 300 to 1200hPa
    • Temperature: -40 … 85°C
  • Pressure level precision: ±0.006hPa (or ±5cm) (high-precision mode)
  • Pressure sensor relative accuracy: ±0.06hPa (or ±0.5m)
  • Temperature accuracy: ±0.5°C
  • Pressure temperature sensitivity: < 0.5Pa/K
  • Measurement time: Low-power mode: 3ms
  • Average current consumption: Low power: 3µA (1 measurement/sec.) and Standby: < 1µA
  • Supply voltage: VDDIO of 1.2 – 3.6V and VDD of 1.7 – 3.6V
  • Interface: I2C and SPI (both with optional interrupt)
  • Package dimensions: 8-pin LGA and 2.0mm x 2.5mm x 1.0mm
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