描述 Description

?Allegro MicroSystems recommends?APS12400?for all new Automotive 2-wire Hall-Effect latch IC designs.

The A1245 is a two-wire Hall-effect latch. The device is produced on the Allegro? 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.

Two-wire latches 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.

The Hall-effect latch will be in the high output current state in the presence of a magnetic south polarity field of sufficient magnitude and will remain in this state until a sufficient north polarity field is present.

The device is offered in two package styles. The LH is a SOT-23W style, miniature low profile package for surface-mount applications. The UA is a 3-pin ultra-mini single inline packages (SIP) for through-hole mounting. Both packages are lead (Pb) free, with 100% matte tin leadframe plating.

特性 Features

? 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

? Operation up to 175°C junction temperature
? Solid-state reliability
? Industry leading ISO 7637-2 performance through use of proprietary, 40?V clamping structures

簡(jiǎn)介

A1245屬于傳感器變送器的磁性傳感器-開關(guān)（固態(tài)）。由制造生產(chǎn)的A1245磁性傳感器 - 開關(guān)（固態(tài)）該系列產(chǎn)品使用固態(tài)技術(shù)來檢測(cè)是否存在超過某個(gè)特定幅度和/或標(biāo)示的磁場(chǎng)，并提供指示是否存在此類磁場(chǎng)的雙態(tài)輸出。它們與磁簧開關(guān)以及線性或羅盤型固態(tài)器件不同，前者通過使用移動(dòng)機(jī)械部件來提供類似的功能，后者提供指示所施加磁場(chǎng)的強(qiáng)度和/或方向的可變輸出。