Hall sensor measures rotation speed and direction

Posted By : Nat Bowers
Hall sensor measures rotation speed and direction

Previously requiring two sensors, the TLE4966V vertical dual-Hall sensor from Infineon supplies information on both rotation direction and speed. The sensor is suited for energy-sensitive electronic automotive systems, such as power window and trunk lift, sun roofs and seat adjustment, as well as for escalators, electric shades and electric blinds.

The TLE4966V reduces sensor costs for system manufacturers by an average of 30% and lowers test and manufacturing time by up to 50%.

For the TLE4966V, Infineon changed the orientation of the two Hall plates from horizontal to vertical. This makes it possible for the TLE4966V to detect in-plane magnetic fields and supply information on rotation direction and speed, for which two sensors have previously been required. Over their entire lifetime, the two integrated vertical Hall plates on one silicon die have the same temperature and stress behaviour with no sensitivity deviation.

Due to the distance between the two Hall plates, they detect slightly shifted signals at any designated time. During a rotation direction change, the phase difference changes polarity. The TLE4966V detects this change and delivers a corresponding signal. It has two signal outputs: one signal for the pole wheel rotation direction and the other for measuring the magnetic pole wheel rotation speed. This signal is triggered by each polarity change of the magnetic field.

The TLE4966V performs on-chip signal processing, which offers major advantages for the system designer: the sensor provides the information within a mere 20µs and the microcontroller does not have to be programmed. There are thus no programming errors, which results in higher system quality. The TLE4966V allows operation from an unregulated power supply and works with systems from 3.5V to 32V.

Production launch of the TLE4966V is June 2014. It comes in a Thin Small Outline Package with 6 pins (TSOP-6).

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