Barometric sensors target mobile devices

August 24, 2017 //By Graham Prophet
Two MEMS-based barometric pressure sensors from Omron Electronic Components Europe are 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 provide stable and reliable height and pressure measurements, allowing changes in elevation of as little as 2m to be reliably recorded.

Developed as an evolution of Omron’s blood pressure gauge, the sensors have been packaged for mobile applications and are smaller at 2.0- x 2.5- x 0.85-mm. The barometric sensors measure pressure with high accuracy based on a 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.

Target applications include wearable, handheld and mobile battery powered products; low power consumption suits smart phones, tablets, pedometers and drones. Omron adds, “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 30 kPa and 110 kPa. Maximum pressure is 800 kPa and the sensors can be used at temperatures of -40 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. The 2SMPB-02E matches the features and performance of the 2SMPB-02B but offers a better level of accuracy down to ±50 Pa. The -02B version offers ±100 Pa.

http://components.omron.eu