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A1184: Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches (PDF)
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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 stress sensitivity
- 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 switch. 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, chopper-stabilization 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 wire than the more traditional open-collector output switches. Additionally, the system designer gains inherent diagnostics because output current normally flows in either of two narrowly-specified ranges. Any output current level outside of these two ranges is a fault condition. The A1184 also features on-chip transient protection, and a Zener clamp to protect against overvoltage conditions on the supply line.
The output current of the A1184 switches HIGH in the presence of a south polarity magnetic field of sufficient strength; and switches LOW otherwise, including when there is no significant magnetic field present.
Both devices are offered in two package styles: LH, a SOT-23W miniature low-profile package for surface-mount applications, and UA, a three-lead ultramini Single Inline Package (SIP) for through-hole mounting. Each package is available in a lead (Pb) free version (suffix, –T) with 100% matte tin plated leadframe.
Also see: A1180, A1181, A1182, A1183, A1185, and A1186.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A1184ELHLT-T | 3-lead SOT | Yes | view data | -40 °C to 85 °C |
Contact Local Sales Representative or check distributor stock |
||
| A1184EUA-T | 3-pin SIP | Yes | view data | -40 °C to 85 °C |
Contact Local Sales Representative or check distributor stock |
||
| A1184LLHLT-T | 3-lead SOT | Yes | view data | -40 °C to 150 °C |
Contact Local Sales Representative or check distributor stock |
||
| A1184LUA-T | 3-pin SIP | Yes | view data | -40 °C to 150 °C |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.