MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES

The A3213xx and A3214xx integrated circuits are ultra-sensitive, pole independent Hall-effect switches with a latched digital output. They are especially suited for operation in battery-operated, hand-held equipment such as cellular and cordless telephones, pagers, and palmtop computers. A 2.4 volt to 5.5 volt operation and a unique clocking scheme reduce the average operating power requirements – the A3213xx to 825 µW, the A3214xx to 14 µW (typical at 2.75 V)! Except for operating duty cycle and average operating current, the A3213xx and A3214xx are identical.

FEATURES
■Micropower Operation
■Operate With North or South Pole
■2.4 V to 5.5 V Battery Operation
■Chopper Stabilized
   Superior Temperature Stability
   Extremely Low Switch-Point Drift
   Insensitive to Physical Stress
■ESD Protected to 5 kV
■Solid-State Reliability
■Small Size
■Easily Manufacturable With Magnet Pole Independence