A motor position sensor device comprises a motor position detection unit being configured to detect a position of a rotor of an electric motor. The motor position sensor device comprises a selection circuit being configured to couple a first supply terminal to provide a supply voltage to the motor position detection unit, if a level of the supply voltage is above the threshold level, and to couple a second supply terminal to provide an auxiliary supply voltage to the motor position detection unit, if the level of the supply voltage is below the threshold level and the level of the auxiliary supply voltage is above the threshold level.