Thursday, December 8, 2022

PCB-Less 3D Magnetic Sensor With Multi-Directional Measurement Capability

By Sharad Bhowmick

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A31316 is a flexible and robust 3D Magnetic Sensor for safety-critical systems. It is capable of withstanding high temperatures and moisture without degradation in performance.

Allegro has announced A31316, a PCB-less 3D Hall-effect position sensor that comes in a small 4 × 4 mm body PCB-less package. The IC includes the industry’s fastest SENT protocol with 0.5 µs to 10 µs tick times and includes a pulse-width modulation (PWM) interface with 125 Hz to 16 kHz carrier for a simple digital interface to microcontrollers. The A31316 is ideal for automotive safety and advanced driver assistance systems (ADAS) applications that require high levels of flexibility and reliable performance in harsh conditions with extreme vibrations such as the powertrain of vehicles and demanding industrial applications that require linear or rotary sensing.

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The A31316 sensor integrates the die and capacitors in a single package to address the need for high-performance, compact-position sensors that are robust. The A31316 can enable flexible integration for precision contactless position sensing. It is Allegro’s first magnetic position sensor to provide multi-direction measurement in a PCB-less SIP package. The A31316 provides designers with a configurable signal path and flexible linearization for end-of-line calibration to optimize measurement accuracy.

“Vehicles are becoming more complex with each passing year, and the number of sensors needed in modern safety and ADAS applications is increasing rapidly. System designers are looking for options that are both flexible and robust, and the A31316 meets that need,” says Scott Milne, Business Line Director for Position Sensors at Allegro. “It’s a great option for safety-critical applications—such as restraint and shifter systems, parking locks, and inhibitor switches—or for challenging applications—such as transmissions and braking systems, where heat and moisture can degrade performance. We’re excited to enable the next generation of vehicle safety systems with this technology.”

The A31316 integrates a Manchester interface for programming the EEPROM through the output pin, which eliminates the need for a separate programming interface. Moreover, the sensor employs the industry’s fastest SENT protocol with 0.5 µs to 10 µs tick times. The A31316 is available in a three-pin PCB-less SIP package.


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