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A1156-F

Allegro
Part Number A1156-F
Manufacturer Allegro
Description Chopper-Stabilized Two-Wire Hall-Effect Switches
Published May 11, 2020
Detailed Description A1152-F, A1153-F, A1155-F, and A1156-F Chopper-Stabilized Two-Wire Hall-Effect Switches FEATURES AND BENEFITS ▪ AEC-Q1...
Datasheet PDF File A1156-F PDF File

A1156-F
A1156-F

Overview
A1152-F, A1153-F, A1155-F, and A1156-F Chopper-Stabilized Two-Wire Hall-Effect Switches FEATURES AND BENEFITS ▪ AEC-Q100 automotive qualified ▪ Factory-set temperature coefficient (TC) for use with ferrite magnets ▪ 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 to 24 V operation ▪ Solid-state reliability Continued on the next page… PACKAGE: 2-Pin, Ultra-Mini SIP (suffix UB) 1.
5 mm × 4 mm × 4 mm DESCRIPTION The A1152-F, A1153-F, A1155-F, and A1156-F comprise a family of two-wire, unipolar, Hall-effect switches, which are factory-trimmed to optimize magnetic switchpoint accuracy.
These devices are produced on the Allegro™ advanced BiCMOS wafer fabrication process, which implements a 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.
Continued on the next page… Not to scale Functional Block Diagram VCC 0.
1 µF Regulator To all subcircuits Clock/Logic Amp Low-Pass Filter Schmitt Trigger Polarity Dynamic Offset Cancellation Sample and Hold A...


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