LIS2HH12 datasheet(16/47 Pages) STMICROELECTRONICS

16 / 47 page

Factory calibration

LIS2HH12

16/47

DocID025344 Rev 5

When an acceleration is applied to the sensor the proof mass displaces from its nominal

position, causing an imbalance in the capacitive half-bridge. This imbalance is measured

using charge integration in response to a voltage pulse applied to the capacitor.

At steady-state the nominal value of the capacitors are a few pF and when an acceleration

is applied, the maximum variation of the capacitive load is in the fF range.

2.8

IC interface

The complete measurement chain is composed of a low-noise capacitive amplifier which

converts the capacitive unbalancing of the MEMS sensor into an analog voltage using an

analog-to-digital converter.

The acceleration data may be accessed through an I2C/SPI interface thus making the

device particularly suitable for direct interfacing with a microcontroller.

The LIS2HH12 features a data-ready signal which indicates when a new set of measured

acceleration data is available, thus simplifying data synchronization in the digital system that

uses the device.

Factory calibration

The IC interface is factory calibrated for sensitivity (So) and Zero-g level (TyOff).

The trim values are stored inside the device in nonvolatile memory. Any time the device is

turned on, the trimming parameters are downloaded into the registers to be used during the

active operation. This allows using the device without further calibration.

LIS2HH12 Datasheet(PDF) 16 Page - STMicroelectronics