New Industry Products

ASIL-B Certified, Advanced Transmission Speed Sensors

January 15, 2019 by Scott McMahan

Allegro MicroSystems Europe has released its most advanced transmission speed sensor family members yet that come complete with ASIL B certification. According to the company, the A19520, A19530, and A19570 magnetic sensor ICs are the result of almost 20 years of application-specific experience and development, including GMR and Hall effect technology. These technologies make them ideal for meeting the requirements of today's transmission applications.

"Until now, there have been no transmission speed sensors available designed to a certified ISO 26262 design process," explained Peter Wells, Senior Product Line Director for Speed Sensors at Allegro Microsystems. "We're proud that all three of these speed sensors will be able to advance the state of the art in transmission safety and excited to bring them to market."

The A19520, A19530, and A19570 magnetic sensor ICs measure both speed and direction information and integrate EMC protection capacitors.

The A19520 sensor incorporates Allegro's SolidSpeed Digital Architecture™, a mixed-signal architecture that the company claims enables the widest dynamic range of air gap and provides a distinction of vibration versus rotation, stray field immunity, and delivers highly adaptive performance (see the functional block diagram above).

The A19520 offers vibration-tolerant sensing of Hall effect transmission speed and direction. It is compatible with existing transmission designs due to its selectable output protocols and employs the company's Hall effect technology along with a two-wire interface. The company's SolidSpeed Digital Architecture™ provides robust, adaptive performance with advanced algorithms that give it vibration immunity over the full target pitch. The sensor features ISO 26262:2011 ASIL B certification with integrated diagnostics and a certified safety design process.

The A19530 is a high Feature, three-wire Hall-effect transmission speed, and direction sensor IC. It delivers advanced signal processing, open/short detection capability, and selectable speed or speed and direction output protocols. Ring magnet and ferrous target sensing are provided, and it can offer true zero-speed operation. The device integrates an EMC capacitor and comes in a single over-molded miniature package. Scan path and Iddq measurement are also offered along, and it boasts robust test coverage capability.

The A19570 sensor brings the same high algorithmic performance as its Hall effect counterparts using GMR and a two-wire interface. It produces significantly larger air gaps and offers flexible device orientations. The sensor with GMR sensing elements offers greater air gap capabilities. Perpendicular read can reduce the device's footprint in space-constrained applications. The A19570 sensor with two capacitor values provides improved EMC performance compared to the other members of the sensor family. Advanced algorithms enable sensing for vibration, DAG, and SAG.

Click here to download a copy of the A19520, A19530, A19570 magnetic sensor IC datasheets.