Allegro MicroSystems unveils a family of transmission speed sensors that come with ASIL B certification. The A19520, A19530, and A19570 magnetic sensor ICs measure speed and direction information and integrate EMC protection capacitors. They also employ the company’s SolidSpeed Digital Architecture, a mixed-signal architecture that enables the widest dynamic range of air gap, distinction of vibration versus rotation, stray field immunity, and highly adaptive performance.
The A19520 allows compatibility with existing transmission designs via its selectable output protocols. It uses Hall effect technology and a two-wire interface. The A19530 provides advanced signal processing, open/short detection capability, and selectable speed or speed and direction output protocols. It relies on the Hall effect and a three-wire interface. Using GMR and a two-wire interface, the A19570 brings the same high algorithmic performance as its Hall effect counterparts, but at significantly larger air gaps and with flexible device orientations.