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MICROPOWER, ULTRA-SENSITIVE HALL-EFFECT SWITCHES

The A3209Ex and A3210Ex 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. 2.5 volt to 3.5 volt operation and a unique clocking scheme to reduce the average operat ing power requirements – the A3209Ex to 400 μW, the A3210Ex to 25 μW! Except for operating duty cycle and average operating current, the A3209Ex and A3210Ex are identical.

FEATURES

■Micropower Operation

■Operate With North or South Pole

■2.5 V to 3.5 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