-The LPS22HB pressure sensor IC (U9) includes both a piezoresistive absolute pressure sensor together with a temperature sensor integrated into a small chip. The pressure sensor (U9) interfaces with the main microcontroller (U1) via an I2C interface. The sensing element is composed of a micromachined suspended membrane for measuring absolute pressure, and includes a Wheatstone bridge internally for measuring the the piezoresistive elements. The temperature pertubations are compensated via an included temperature sensor on-chip. The absolute pressure can range from 260 to 1260 hPa. Pressure data can be polled via I2C at up to 24-bits, while temperature data can be polled at up to 16-bits.
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