A19351: High-Performance GMR AK Protocol Wheel Speed and Direction Sensor IC

The A19351 is a giant magnetoresistance (GMR) magnetic sensor integrated circuit (IC) designed to measure ring magnets, especially for automotive wheel speed and direction applications. The IC fully integrates sensing elements, voltage regulators, analog-to-digital converters, and a digital controller to adaptively measure the magnetic signal and provide a robust, low-jitter AK Protocol output over the two-wire interface.

The A19351 features Allegro’s SolidSpeed Digital Architecture, the latest mixed-signal speed sensor architecture for highly adaptive performance that provides the widest dynamic range of operating air gaps with temperature drift compensation. Flexibility is passed to the system integrator, enabling looser mechanical constraints with a wide operating air gap.

The GMR based IC was developed in accordance with ISO 26262 as a hardware safety element out of context with ASIL B(D) capability (pending assessment) for use in automotive safety-related systems when integrated in the manner prescribed in the applicable safety manual and datasheet.

• GMR technology integrates high sensitivity MR (magnetoresistive) sensor elements and high precision BiCMOS circuits on a single silicon integrated circuit, offering high accuracy, low magnetic field operation.  This technology provides highly repeatable, ultra-low jitter signal for iTPMS and ADAS applications

• Wide air gap capability eases mechanical mounting tolerance requirements to enable lower cost AK Protocol compliant output with air gap information

• SolidSpeed Digital Architecture™ provides robust, adaptive performance with advanced algorithms

• ISO 26262 ASIL B(D) with integrated diagnostics and certified safety design process