STMicroelectronics – LPS27HHTW MEMS Pressure Sensor

The LPS27HHTW from STMicroelectronics is a piezo-resistive absolute pressure sensor which functions as a barometer with a digital output, measuring pressure at 24-bit resolution in a range between 260hPa and 1,260hPa.

The sensor is supplied in a ceramic LGA package, and has a cylindrical metal lid which allows for easy assembly with O-rings in the end product. The package is holed to allow external pressure to reach the sensing element. Gel inside the IC protects the electrical components from water, and the metal cap is grounded electrically to better withstand ESD strikes.

A built-in temperature sensor measures ambient temperature to an accuracy of ±1.5°C. The device implements temperature compensation automatically, achieving absolute accuracy of pressure measurement of ±0.5hPa. The output data rate for pressure measurements is user-configurable between 1Hz and 200Hz.

The compact device comprises a MEMS sensing element and an IC interface which communicates through an I²C, MIPI I3C^®, or serial peripheral interface from the sensing element to the application. The sensing element, which detects absolute pressure, consists of a suspended membrane manufactured using a dedicated process developed by ST.