Infineon Technologies has released a new family of Hall sensors for automotive use. The Hall ICs, which feature high-precision unipolar or bipolar magnetic switching behaviour, are characterised by their high precision and resistance to electrical interference and mechanical stress. The use of active error compensation ('chopped' Hall system) to suppress the effect of offset components, coupled with good resistance to electrostatic and electromagnetic interference, makes systems designed with the new sensors very cost-efficient and reliable.
The TLE49x6 family ICs were developed for use as position and proximity switches in a wide variety of automotive subsystems, such as seat adjusters, seat-belt buckles, and electric windows and sunroofs. The first members of the family include a 2-wire sensor with a current interface (TLE4976), a unipolar switch (TLE4906), a bipolar switch (TLE4946) and a double-Hall switch (TLE4966) with output pins for pulse speed and directional signals. The TLE4966 double-Hall switch replaces two conventional Hall sensors, reducing the costs involved in mounting, signal guidance and signal processing.
The Hall switches incorporate the Hall sensor cell, bias generator, compensating circuit, comparator, oscillator and output transistor.
The compensating circuits of the Hall switches balance out possible manufacturing process technology-related influences. At the same time, active error compensation capability suppresses the effects of other voltage-generating mechanisms, such as mechanical stress. This chopper technology, in conjunction with the integral comparator, ensures high-precision magnetic switching. All sensors of the TLE49x6 family are characterised by their superior jitter performance, which in turn permits high precision (typically 1 µs).
The new Hall sensors come in space-saving packages - both for wired and SMT. For example, the double-Hall switch is available in what is the industry's flattest wired housing (P-SSO-4-1, a thickness of 1,0 mm), and the most compact SMT housing (P-TSOP6-6-3, measuring 1,5 x 2,9 x 1,1 mm).
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