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Hall switch extends circuit design flexibility

16 Apr 2013

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Diodes Inc. hall effect switch

Diodes Inc. has introduced what it describes as a programmable omnipolar Hall effect switch that allows designers to use the same contactless detection circuit in multiple applications or with different field strengths. According to the company, the miniature and micropower AH1898 is intended for portable consumer applications such as cell phones, tablets and cameras as well as a domestic, office and industrial equipment.

Able to detect both north and south magnetic fields, the AH1898 features a band-select pin, which allows device sensitivity to be changed to one of two predefined magnetic sensitivity ranges. In addition, it can be used to change the band on the fly, using an external logic source or MCU. The high sensitivity of the Hall sensor also means that it can support weaker, lower cost magnets and can be used at a greater distance from the magnet.

The AH1898 Hall switch has been optimised for use over a 1.6-3.6V supply range and uses a hibernating clocking system to minimise power consumption, said Diodes. With an average supply current of just 4.3µA (typical) at 1.8V, the device helps to extend portable battery cell lifetime.

The AH1898 has been designed with an 8kV ESD rating on supply and output pins. Circuit robustness is further raised by the AH1898's chopper stabilised design, delivering superior temperature stability over the operating range from -40°C to 85°C, absolute minimum switch point drift, and enhanced immunity to RF noise and physical stress.

The AH1898 is available in a 0.8 x 0.8mm CSP package. At the same time, its simple 4-pin footprint and integration of pull-up resistors results in reduced external component counts and a simplification of PCB layouts, added Diodes.

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