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Allegro Intros Two-Wire Hall Effect Latch

11 September 2015

Allegro MicroSystems has announced the A1245, a two-wire Hall-effect latch with increased magnetic sensitivity. The latch is produced on Allegro’s advanced BiCMOS wafer fabrication process. It implements Allegro’s patented high frequency, four-phase, chopper-stabilization techniques to achieve magnetic stability over its full operating temperature range, -40 to 150°C. A Hall-effect latch will be in the high output current state in the presence of a magnetic south polarity field of sufficient magnitude and will remain in this state until a sufficient north polarity field is present.

The A1245 provides speed and position sensing of ring-magnets or other moving/rotating assemblies in safety-critical and/or long wiring harness applications.The A1245 provides speed and position sensing of ring-magnets or other moving/rotating assemblies in safety-critical and/or long wiring harness applications.Two-wire latches are advantageous in cost-sensitive applications as they require one less wire for operation. The system designer gains diagnostics since there is always output current flowing in either of two narrow ranges. Any current level not within these ranges indicates a fault condition.

The A1245 is designed for speed and position sensing of ring-magnets or other moving/rotating assemblies in applications that are safety-critical and/or have long wiring harnesses. Examples include automotive applications such as internal mode switch (IMS) transmissions and transmission range switch (TRS)/manual level position sensor (MLPS) shift selectors; electronic parking brake motors; electronic power steering (EPS); and sunroof, tailgate and other motors; industrial/consumer applications include white goods, industrial/factory automation, and automatic doors. Overall ruggedness, including industry leading ISO 7637-2 performance, is achieved with an integrated voltage regulator, clamping diodes, ESD protection and reverse-battery protection.

The device is offered in two package styles. The LH is a SOT-23W style, miniature low profile package for surface-mount applications. The UA is three-pin ultra-mini single inline packages (SIP) for through-hole mounting. Both packages are RoHS-compliant with 100% matte tin lead-frame plating.

The A1245 is offered with a choice of current levels corresponding to the switch’s off or low state, ICC(L). Pricing is $0.61 each in quantities of 1,000.

Questions or comments on this story? Contact the author of this article, email engineering360editors@ihs.com

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Allegro Microsystems LLC



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