Procedure for the activation of a magnetic field sensor and magnetic field sensor

摘要

Method of activation of magnetic field sensor device (MSV)a coil (SP),a power supply,a circuit device with a growth circuit (AW) and an evaluation circuit (AUS) and a magnetic field sensor (SEN); andthe growth circuit (AW) is connected to the coil (SP) and the voltage supply and the evaluation circuit (AUS) is connected to the magnetic field sensor (SEN) and the evaluation circuit (AUS) is set up to provide an operating current for the magnetic field sensor (SEN), and the evaluation switch (AUS) has a first and a second state, the first state being formed as sleep mode and the second state as a waking state, where a voltage is induced in a first step by the effect of a change of flow in the coil (SP); andthe induced voltage is detected in a second step in the growth circuit (AW); andin a third step by means of the growth switch (AW) the evaluation switch (AUS) is activated by transferring the evaluation switch (AUS) from the first state to the second state and by means of the evaluation switch (AUS) in the second state to supply the magnetic field sensor (SP) with the operating current,characterized by:the induced voltage is integrated and an initiation of the analysis switch (AUS) is only performed when the energy generated from the induction exceeds a second threshold value; where the circuit device and the magnetic field sensor (SEN) are monolithically integrated in a semiconductor body and arranged in an IC housing (GH).