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A1184| Datasheet

By datasheet - November 25th, 2008

A1184| Datasheet

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A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches
Features and Benefits
Chopper stabilization Low switchpoint drift over operating temperature range Low sensitivity to stress Field programmable for optimized switchpoints On-chip protection Supply transient protection Reverse-battery protection On-board voltage regulator 3.5 to 24 V operation

Description
The A1184 device is a standard, two-wire, unipolar, Hall effect switches. The operate point, BOP, can be field-programmed, after final packaging of the sensor and placement into the application. This advanced feature allows the optimization of the sensor switching performance, by effectively accounting for variations caused by mounting tolerances for the device and the target magnet. This family of devices are produced on the Allegro MicroSystems advanced BiCMOS wafer fabrication process, which implements a patented, high-frequency, chopperstabilization technique that achieves magnetic stability and eliminates the offsets that are inherent in single-element devices exposed to harsh application environments. Commonly found in a number of automotive applications, the A1184 is utilized to sense: seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position. Two-wire unipolar switches are particularly advantageous in price-sensitive applications, because they require one less w
ire than the more traditional open-collector output switches. Additionally, the system designer gains inherent diagnostics because output current normally flows in either
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Packages: 3 pin SOT23W (suffix LH), and 3 pin SIP (suffix UA)

Not to scale

Functional Block Diagram
V+ VCC Program/Lock Programming Logic Offset

Regulator Clock/Logic 0.01 uF Sample and Hold Dynamic Offset Cancellation Low-Pass Filter

Amp

GND Package UA Only

GND

A1184-DS, Rev. 5


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