03 March 2011
The new A1152/3/5/6 from Allegro MicroSystems Europe are a range of two-wire unipolar Hall-effect switches designed for
automotive sensing applications in seat-belt buckle, seat position and steering lock applications.
The new devices are produced using the Allegro advanced BiCMOS wafer fabrication process and include improved high-voltage transient protection: a critical factor for automotive applications where external protection circuitry cannot be located close to the sensor.
These Hall-effect switches are factory trimmed to optimise the accuracy of the magnetic switch points and employ a patented high-frequency four-phase chopper-stabilisation technique to achieve magnetic stability over temperature and to eliminate the offset inherent in single-element devices, when exposed to harsh automotive environments. The advanced chopping technique also provides significantly reduced jitter and shorter power-on times.
Two-wire unipolar switches require one less wire for operation than the more traditional open-collector output switches and also offer diagnostic capability as there is always current present at one of two specified levels.
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