True Power-On Camshaft Sensor with Integrated Back Magnet, Advanced Fully Synchronous Digital IC and EMC Protection

[Introduction]We have previously introduced Allegro’s giant magnetoresistive (GMR) crankshaft sensor ATS16951 for full and mild hybrid engine applications. The perfect matching camshaft sensor for this crankshaft sensor is Allegro with an integrated back magnet (back- biasing magnet), advanced fully synchronous digital IC and EMC protected ATS16351. The two products work perfectly together to help designers achieve an optimized engine design, reduce the number of suppliers, and reduce system complexity.

Figure 1: ATS16351 functional block diagram

The ATS16351 has the following key features:

● GMR sensing technology

● High resistance to stray fields

● Larger operating air gap

● True Power On State (TPOS) operation

● Integrated EMC components

● Target Profile Diagnostics function

ATS16351 application advantages

The ATS16351 is a true power-on camshaft sensor that integrates a back magnet, advanced fully synchronous digital IC and EMC protection circuitry in a single sensing solution. The ATS16351 integrates a GMR bridge with an optimized custom magnetic circuit that switches based on the magnetic signal induced by a ferromagnetic target. The ATS16351’s integrated EMC components eliminate the need for other external protection components, while providing world-class immunity to stray field interference. The ATS16351 has a variety of factory programmable options for performance optimization, saving the user design time and system cost.

Figure 2: ATS16351 Typical Application Circuit

Despite the accelerating trend towards full electrification in the global automotive market, recent IHS forecasts suggest that by 2029, 81% of vehicles will still be equipped with some form of internal combustion engine, with full and mild hybrids being the most common models. Engine architectures are changing to accommodate the transition to smaller hybrid designs, and sensor accuracy and positioning flexibility will become more important than ever.