Programmable Hall switch

29 May 2013 Switches, Relays & Keypads

Diodes Incorporated has announced a programmable omnipolar Hall effect switch enabling designers to use the same contactless detection circuit in multiple applications or with different field strengths. The miniature AH1898 is suitable for numerous portable consumer applications including cellphones, tablets and cameras, as well as a variety of domestic, office and industrial equipment.

Able to detect both North and South magnetic fields, the IC features a band-select pin which allows device sensitivity to be changed to one of two predefined magnetic sensitivity ranges. It can also be used to change the band on the fly, using an external logic source or microcontroller. 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 Hall switch has been optimised for use over a 1,6 V to 3,6 V supply range and employs a hibernating clocking system to minimise power consumption. With an average supply current of just 4,3 μA at 1,8 V, it helps to extend portable battery cell lifetime.

To ensure high reliability in a broad range of applications, the AH1898 has been designed with an 8 kV ESD rating on supply and output pins. Circuit robustness is further raised by a chopper stabilised design, delivering enhanced 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 device is available in the miniature 0,8 x 0,8 mm CSP package, making it 12 times smaller than common TSOT-packaged alternatives. 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.

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