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A1148LLHLT-T Datasheet(PDF) 1 Page - Allegro MicroSystems |
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A1148LLHLT-T Datasheet(HTML) 1 Page - Allegro MicroSystems |
1 / 12 page Description The A1147 and A1148 devices are two-wire, unipolar, Hall effect switches that are factory-programmed at end-of-line to optimize ultrasensitive magnetic switchpoint accuracy. These devices use a patented high frequency chopper-stabilization technique, produced using the Allegro advanced BiCMOS wafer fabrication process, to achieve magnetic stability and to eliminate offset inherent in single-element devices exposed to harsh application environments. Commonly found in a number of automotive applications, these switches are utilized to sense seat track position, seat belt buckle presence, hood/trunk latching, and shift selector position. Two-wire unipolar switches, such as the A1147 and A1148, are particularly advantageous in price-sensitive applications because they require one less wire for operation thandoswitcheswiththemoretraditionalopen-collectoroutput. 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. These devices also A1147-DS, Rev. 8 Features and Benefits ▪ Chopper stabilization ▫ Low switchpoint drift over operating temperature range ▫ Low sensitivity to stress ▪ Factory programmed at end-of-line for optimized switchpoints ▪ On-chip protection ▫ Supply transient protection ▫ Reverse-battery protection ▫ On-board voltage regulator ▫ 3.5 to 24 V operation Low Current Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches Continued on the next page… Functional Block Diagram Not to scale Packages: 3 pin SOT23W (suffix LH), and 3 pin SIP (suffix UA) A1147 and A1148 Amp Regulator Low-Pass Filter GND VCC GND Package UA Only 0.01 uF V+ Clock/Logic To All Subcircuits |
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