The two-wire differential wheel speed sensor GX7472 is used for wheel speed sensing in automotive applications and is compatible with TLE7472

Wheel speed sensor is a sensor used to measure the rotational speed of car wheels. For modern cars, wheel speed information is essential. Vehicle dynamic control systems (VDC), electronic stability programs (ESP), anti lock braking systems (ABS), automatic transmission control systems, etc. all require wheel speed information. So the wheel speed sensor is one of the most critical sensors in modern cars. The commonly used wheel speed sensors include magneto electric wheel speed sensors and Hall type wheel speed sensors. This article mainly introduces the application of a Hall wheel speed sensor AH742 for wheel speed sensing in automotive applications.

Hall type wheel speed sensors have the following characteristics:

The amplitude value of the output signal voltage is not affected by the rotational speed;

High frequency response;

Strong ability to resist electromagnetic wave interference.

The GX7472 is a new generation wheel speed and direction detection sensor chip developed based on advanced differential Hall technology and high-performance, dedicated ASIC signal processors. This chip is mainly used in the modern vehicle power control system ABS to provide information on speed and rotation direction, assembly position, and limited air gap. The output is a two-wire current interface based on pulse width modulation (PWM) principle.

This sensor does not require external components to operate and combines fast power on time with low cutoff frequency. Its excellent accuracy and sensitivity are suitable for demanding automotive requirements such as wide temperature range, high ESD, and EMC robustness. Optimized piezoelectric compensation and integrated dynamic offset compensation improve the sensor‘s anti-interference ability against stray magnetic fields, ferromagnetic particles, or other disturbances. In addition, GX7472 also provides an external 1.8nF capacitor to improve EMC performance. The main functions of its product are introduced as follows:

Two wire PWM current output interface

• Rotation direction detection

• Air gap diagnosis, assembly position diagnosis

• Dynamic automatic calibration

• High sensitivity

• Back magnetic north and south pole self induction

• High resistance piezoelectric effect

• Large working air gap

Wide working temperature range -40 ℃~150 ℃

PG-SS0-2-4 package, compliant with RoHS certification standards

The GX7472 sensor also has good anti-interference ability and can stably output signals in the complex electromagnetic environment of automobiles, reducing the generation of false alarms and erroneous data and ensuring the reliability of the system.