Functionality
4 Functionality
LPS22HH
The LPS22HH is a high-resolution, digital output pressure sensor packaged in an HLGA fullmold package. The complete device includes a sensing element based on a piezoresistive
Wheatstone bridge approach, and an IC interface which communicates a digital signal from the sensing element to the application.
An ST proprietary process is used to obtain a silicon membrane for MEMS pressure sensors. When pressure is applied, the membrane deflection induces an imbalance in the
Wheatstone bridge piezoresistances whose output signal is converted by the IC interface.
The complete measurement chain is composed of a low-noise amplifier which converts the resistance unbalance of the MEMS sensors (pressure and temperature) into an analog voltage using an analog-to-digital converter.
The pressure and temperature data may be accessed through an I²C/MIPI I3C SM /SPI interface thus making the device particularly suitable for direct interfacing with a microcontroller.
The LPS22HH features a Data-Ready signal which indicates when a new set of measured pressure and temperature data are available, thus simplifying data synchronization in the digital system that uses the device.
The trimming values are stored inside the device in a non-volatile structure. When the device is turned on, the trimming parameters are downloaded into the registers to be employed during the normal operation which allows the device to be used without requiring any further calibration.
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