Barometric sensors for battery operated mobile devices

Posted By : Joe Bush
Barometric sensors for battery operated mobile devices

Two MEMS-based barometric pressure sensors from Omron Electronic Components Europe have been specifically designed to support height and pressure measurement in drones, smartphones, pedometers and other battery powered mobile systems. The Omron 2SMPB-02B and 2SMPB-02E sensors provide stable and reliable height and pressure measurements, allowing changes in elevation to be reliably recorded.

Developed as an evolution of the blood pressure gauge, the new sensors have been specifically remodelled for mobile applications and are smaller at 2.0x2.5x0.85mm in size. The new barometric sensors measures pressure with high accuracy based on the built-in low noise 24-bit ADC and feature digital control and output via I2C / SPI interfaces. Both automatically power down non-working circuits to minimise the power consumption. Individual calibration parameters are stored in One Time Programmable-ROM (OTP), and are retained when the system is powered down. An integrated temperature compensation circuit helps ensure accurate absolute pressure measurements.

Commenting, Gabriele Fulco, Omron Sensors Product Manager for Europe, said: “These easy to use sensors are perfect for the growing variety of wearable, handheld and mobile battery powered applications and have low power consumption making them optimal for smart phones, tablets, pedometers and drones.” He continued: “Usually MEMS sensors are affected by assembly stress, but because these sensors have a ceramic substrate and a metal lid, there is much lower parameter shift during assembly.”

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°C up to +85°C without condensation or icing. The sensors have a pin layout that is compatible with alternative solutions on the market, simplifying integration.

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 meters, car navigation and floor detection.

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