ST’s gyroscopes include a Self Test function. By applying a logic one to a dedicated pin, the mass is moved by an electrostatic actuator. It is then possible to detect a voltage variation on the output and verify that the mechanical mass and ASIC circuitry are working correctly. Another feature is the possibility to power down the sensor with the PD pin. When the power-down mode is activated, the calibration values remain stored inside internal registers while the rest of the circuit is turned off. The sensor consumes as little at 5 µA in the Power-Down mode.