Hall effect provides the right angle

摘要

Contactless Hall-effect magnetic sensors provide high output refresh rates and low signal-path latency to support a wide variety of demanding automotive and industrial applications. Two new parts from Allegro MicroSystems Europe, the A1332 and A1334 have system-on-chip (SoC) architectures to provide high-resolution 360° angle sensors based on magnetic circular vertical Hall (CVH) technology. Both devices are suited for applications requiring accurate measurement of angles. The A1332, with an onboard 32-bit processor and EEPROM for factory and customer programmability, includes segmented and Fourier linearisation functions for supporting challenging off-axis/side-shaft magnetic sensing configurations that are commonly found in electronic power steering and transmission applications. The A1332 also supports on-axis/end-of-shaft magnetic sensing configurations, and can produce high-accuracy angle measurements with an output refresh period of 32μs. The device incorporates a two-wire PC digital interface with signal path and I/O diagnostics for achieving higher reliability to meet ASIL automotive safety requirements.