LSM303AGR Datasheet, PDF (28/68 Pages) STMicroelectronics – ultra-low-power 3D accelerometer and 3D magnetometer

Functionality
LSM303AGR
4.2.4
Accelerometer self-test
The self-test allows the user to check the sensor functionality without moving it. When the
self-test is enabled, an actuation force is applied to the sensor, simulating a definite input
acceleration. In this case the sensor outputs will exhibit a change in their DC levels which
are related to the selected full scale through the device sensitivity. When the self-test is
activated, the device output level is given by the algebraic sum of the signals produced by
the acceleration acting on the sensor and by the electrostatic test-force. If the output signals
change within the amplitude specified inside Table 3, then the sensor is working properly
and the parameters of the interface chip are within the defined specifications.
The self-test procedure is described in the following figure.
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