The recommended power-on sequence is to first power up the VDD supply, followed by the VDDIO supply. This ensures that the internal voltage regulators are properly initialized.
The self-test feature can be enabled by setting the ST1 and ST2 bits in the CTRL_REG4 register. During self-test, the sensor outputs a predefined pattern. It's recommended to disable the self-test feature during normal operation to avoid interfering with actual acceleration data.
The FIFO buffer is used to store acceleration data when the sensor is operating in burst mode or when the data rate is higher than the SPI bus speed. It allows the microcontroller to read data at a slower rate than the sensor's output rate, reducing the likelihood of data loss.
Calibration involves adjusting the sensor's offset and sensitivity to compensate for manufacturing variations and environmental factors. STMicroelectronics provides a calibration procedure in the datasheet, which involves measuring the sensor's output at different orientations and temperatures.
The LIS331DLF can measure accelerations up to ±24g, but the maximum range depends on the selected full-scale range (FSR) setting. The FSR can be set to ±2g, ±4g, ±8g, or ±24g using the FS1 and FS2 bits in the CTRL_REG1 register.
LIS331DLF datasheet
by STMicroelectronics
