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A3214

Allegro
Part Number A3214
Manufacturer Allegro
Description Micropower Ultra-Sensitive Hall-Effect Switches
Published Sep 19, 2016
Detailed Description A3213 and A3214 Micropower Ultra-Sensitive Hall-Effect Switches FEATURES AND BENEFITS • AEC-Q100 automotive qualified ...
Datasheet PDF File A3214 PDF File

A3214
A3214

Overview
A3213 and A3214 Micropower Ultra-Sensitive Hall-Effect Switches FEATURES AND BENEFITS • AEC-Q100 automotive qualified • Micropower operation • Operate with north or south pole • 2.
4 to 5.
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 assembly into applications due to magnetic pole independence Packages: 3 pin surface mount SOT23-W (suffix LH) 3 lead ultramini SIP (suffix UA) Not to scale DESCRIPTION The A3213 and A3214 integrated circuits are ultra-sensitive, pole-independent Hall-effect switches with a latched digital output.
They are especially suited for operation in batteryoperated, hand-held equipment such as cell and cordless telephones and palmtop computers.
A 2.
4 to 5.
5 V operation and a unique clocking scheme reduce the average operating power requirements: the A3213 to 825 µW, the A3214 to 14 µW (typical, at 2.
75 V).
Except for operating duty cycle and average operating current, the A3213 and A3214 are identical.
Unlike other Hall-effect switches, either a north or south pole of sufficient strength will turn the output on; in the absence of a magnetic field, the output is off.
The polarity independence and minimal power requirement allows 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 residual offset voltage normally caused by device overmolding, temperature dependencies, and thermal stress.
Continued on the next page… SUPPLY SWITCH X TIMING LOGIC OUTPUT GROUND DYNAMIC OFFSET CANCELLATION SAMPLE & HOLD LATCH 27622.
62-DS Rev.
27 Functional Block Diagram Dwg.
FH-020-5 A3213 and A3214 Micropower Ultra-Sensitive Hall-Effect Switches Description (contin...


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