Allegro MicroSystems Europe's A3211 micropower, ultra-sensitive Hall-effect switch IC features an inverted output compared with the company's established A3212 device. The combination of a 2,5-3,5 V operating voltage range and a unique clocking scheme reduce the average operating power requirements to less than 15 μW with a 2,75 V supply.
Unlike other Hall-effect switches, either a north or south pole of sufficient strength will turn the output on.
The device includes, on a single silicon chip, a Hall-voltage generator, small-signal amplifier, chopper stabilisation circuitry, a latch, and a MOSFET output. Advanced BiCMOS processing is used to take advantage of low-voltage and low-power requirements, component matching, very low input-offset errors, and small component geometries.
The polarity independence and minimal power requirements means that these devices can easily replace reed switches for reliability and ease of manufacturing, while eliminating the requirement for signal conditioning.
Four package styles available provide magnetically-optimised solutions for most applications. Miniature low-profile surface-mount package types EH and EL (0,75 and 0,50 mm nominal height) are leadless; LH is a leaded low-profile SMD; and UA is a three-lead single-inline package for through-hole mounting.
For more information contact Simon Churches, Arrow Altech Distribution, +27 (0)11 923 9600, [email protected]
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