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A1157 Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A1157 Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 12 page Description The A1150, A1152, A1153, A1155, A1156, A1157, and A1158 comprise a family of two-wire, unipolar, Hall-effect switches, which are factory-trimmed to optimize magnetic switchpoint accuracy.ThesedevicesareproducedontheAllegro®advanced BiCMOS wafer fabrication process, which implements a patented high frequency, 4-phase, chopper-stabilization technique. This technique achieves magnetic stability over the full operating temperature range, and eliminates offsets inherent in devices with a single Hall element that are exposed to harsh application environments. The A115x family has a number of automotive applications. These include sensing seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position. Two-wire unipolar switches are particularly advantageous in cost-sensitive applications because they require one less wire for operation versus the more traditional open-collector output switches. Additionally, the system designer inherently gains diagnostics because there is always output current flowing, which should be in either of two narrow ranges. Any current level not within these ranges indicates a fault condition. A1152-DS, Rev. 3 Features and Benefits ▪ High speed, 4-phase chopper stabilization ▪ Low switchpoint drift throughout temperature range ▪ Low sensitivity to thermal and mechanical stresses ▪ On-chip protection ▫ Supply transient protection ▫ Reverse battery protection ▫ On-board voltage regulator ▫ 3.0 to 24 V operation ▪ Solid-state reliability ▪ Robust EMC and ESD performance ▪ Industry leading ISO 7637-2 performance through use of proprietary, 40-V clamping structures Chopper-Stabilized, Two Wire Hall-Effect Switches Continued on the next page… Functional Block Diagram A1150, A1152, A1153, A1155, A1156, A1157, and A1158 Packages Approximate footprint 3-pin SOT23-W 2 mm × 3 mm × 1 mm (suffix LH) 3-pin ultramini SIP 1.5 mm × 4 mm × 3 mm (suffix UA) Amp Regula To all subcircuits tor Schmitt Trigger Polarity Low-Pass Filter GND VCC GND UA package only 0.01 μF V+ Clock/Logic |
Similar Part No. - A1157 |
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Similar Description - A1157 |
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