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Barometric sensors for battery operated mobile devices

Two MEMS-based barometric pressure sensors from Omron are said to be specifically designed to support height and pressure measurement in drones, smartphones, pedometers and other battery powered mobile systems.

The 2SMPB-02B and 2SMPB-02E sensors are said to provide stable and reliable height and pressure measurements, allowing changes in elevation of 2m to be reliably recorded.

Developed as an evolution of the blood pressure gauge, the sensors have been specifically remodelled for mobile applications and measure 2.0 x 2.5 x 0.85mm in size.

With a built-in low noise 24bit A/D converter, the barometric sensors feature digital control and output via I2C / SPI interfaces and automatically power down non-working circuits to minimise the power consumption.

Individual calibration parameters are stored in One Time Programmable-ROM, and are retained when the system is powered down. An integrated temperature compensation circuit helps ensure accurate absolute pressure measurements.

Both sensors are configured to measure the pressure of air between 30kPa and 110kPa. Maximum pressure is 800kPa and the sensors can be used at temperatures of -40 to 85°C without condensation or icing. The sensors have a pin layout that is compatible with alternative solutions on the market, simplifying integration.

According to the company, 2SMPB-02E matches the features and performance of the 2SMPB-02B but offers a better level of accuracy down to +/-50Pa. The -02B version is +/-100Pa.

Applications include wearables, tablets, smart phones, drones, altitude metres, car navigation and floor detection.

Peggy Lee

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