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Allegro Microsystems Hall-effect switch operates at <155W

Posted: 29 Jan 2002 ?? ?Print Version ?Bookmark and Share

Keywords:allegro microsystems? allegro? hall-effect switch? hall-effect sensor? mechanical switches?

The A3212 pole-independent Hall-effect switch operates with a 2.5V to 3.5V battery supply and has a unique clocking scheme that reduces average operating power requirements to <155W at 2.75V input. It is designed to replace mechanical/reed switches in battery-operated, portable devices such as flip phones, pagers, personal organizers, laptops and palmtop computers.

Unlike other Hall-effect switches, either a north or south pole of sufficient strength will turn the output of the A3212 on and the absence of a magnetic field will turn the output off. The sensor also features ESD protection up to 5kV and a latched digital output and provides improved magnetic sensitivity with minimal switchpoint shifts over temperature.

The device also features chopper stabilization (dynamic offset cancellation) that reduces the residual offset voltage normally caused by device overmolding, temperature dependencies and thermal stress.

The A3212 is supplied in either a three-lead MSIP for through-hole or surface mounting, or three-lead MLP. The version screened for the -400C to 850C temperature range is priced at 50 cents, while the one screened for the -400C to 1500C temperature range is 69 cents, both in quantities of 10,000.

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