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A3211 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A3211 Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 13 page DFN (EH) TheA3211andA3212integratedcircuitsareultrasensitive,pole independent Hall-effect switches with latched digital output. These devices are especially suited for operation in battery- operated, hand-held equipment such as cellular and cordless telephones, pagers, and palmtop computers. A 2.5 to 3.5 V operation 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 in the A3212, and in the absence of a magnetic field, the output is off. The A3211 provides an inverted output.The polarity independence and minimal power requirements allow these devices to easily replace reed switches for superior reliability and ease of manufacturing, while eliminating the requirement for signal conditioning. Improved stability is made possible through chopper stabilization (dynamic offset cancellation), which reduces the residualoffsetvoltagenormallycausedbydeviceovermolding, temperature dependencies, and thermal stress. This device includes on a single silicon chip a Hall-voltage generator, small-signal amplifier, chopper stabilization, a latch, and a MOSFET output. Advanced CMOS processing is used to take advantage of low-voltage and low-power 3211-DS, Rev. 22 • AEC-Q100 automotive qualified • Micropower operation • Operation with north or south pole • 2.5 to 3.5 V battery operation • Chopper stabilized □ Superior temperature stability □ Extremely low switchpoint drift □ Insensitive to physical stress • High ESD protection • Solid-state reliability • Small size • Easily manufacturable with magnet pole independence Micropower, Ultrasensitive Hall-Effect Switches Packages: Functional Block Diagram Not to scale A3211 and A3212 DFN (EL) SOT23W (LH) SIP (UA) TIMING LOGIC Dwg. FH-020-5 GROUND OUTPUT SUPPLY X SWITCH FEATURES AND BENEFITS DESCRIPTION Continued on next page.... |
Similar Part No. - A3211_16 |
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Similar Description - A3211_16 |
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