The recommended power-on sequence is to apply VDD first, followed by VDDIO, and then the clock signal. This ensures proper initialization of the device.
To configure the LIS331DLMTR for low-power mode, set the LPEN bit in the CTRL_REG1 register to 1. This reduces the current consumption to approximately 10 μA.
The self-test feature is used to verify the integrity of the sensor and the analog-to-digital converter (ADC). It applies a known acceleration to the sensor and checks the output values to ensure they are within the expected range.
Interrupts are generated when the acceleration values exceed the threshold set in the INT1_CFG register. The interrupt signal is active-low and can be connected to a microcontroller's interrupt pin. The interrupt source can be cleared by reading the INT1_SRC register.
The LIS331DLMTR should be placed near the center of the PCB to minimize vibrations and noise. The device should be oriented with the sensitive axis (Z-axis) perpendicular to the PCB. Decoupling capacitors should be placed close to the device to filter out noise.
LIS331DLMTR datasheet
by STMicroelectronics
