Infineon simplifies speed measuring sensor designs

For reliable and fast measurement of speed, Infineon Technologies is offering the new Hall sensor TLE4922 as well as the “Speed Sensor 2Go” design kit that goes with it. The TLE4922 was developed for industrial and automotive applications, where fast and reliable measurement of speed is critical, such as speed detection of crankshafts and transmissions in two-wheelers and three-wheelers.

The TLE4922 Hall sensor reliably measures changes of magnetic fields. This means it can be used for speed detection in a wide range of wheel types, such as magnetic encoder wheels or ferromagnetic gear wheels. Apart from its flexible range of application, the TLE4922 also lowers system costs. For instance, it enables use of a simple, cost-efficient magnet in a back-bias configuration, while providing high air gap performance and shift accuracy. The sensor is also very robust in withstanding vibration and air gap jumps. It can provide precise speed detection across the extremely wide magnetic field range of +/- 400 mT. The large operating range simplifies the electrical circuit design and makes it robust and flexible. This makes installing the sensor easier, further contributing to a reduction in the system costs.

The TLE4922 is particularly suitable for a TIM (Twist Independent Mounting) configuration. It can therefore replace passive VR (variable reluctance) sensors in the motor and on the wheels of two-wheelers and cars. Compared to VR sensors, the TLE4922 delivers an accurate measurement of rotational speed as of 0 Hz. It also has very good jitter behavior and offers extensive protection functions against short circuits, overtemperature and reverse voltage. Its good electromagnetic compatibility (EMC) and ESD robustness make it suitable for use in harsh environments. It operates with a supply voltage of 4.5 V to 18 V and in a wide temperature range from -40 °C to 155 °C. The sensor is available in a 4-pin SSO package.

The “Speed Sensor 2Go” kit lets developers evaluate the TLE4922 easily and quickly. This allows them to very quickly see how the TLE4922 works in the respective application. First measurements can be made in just a few minutes. The “Speed Sensor 2Go” kit includes a sensor module, an interface board and a cable. The sensor module integrates a TLE4922 sensor and a back-bias ferrite magnet. The interface board has two XMC microcontrollers: one for triggering and one for debugging. Its USB cable connects to the PC. A GUI-based evaluation tool records and graphically displays speed data. In addition to the “Speed Sensor 2Go” kit, Infineon offers additional software-based development tools for sensor simulation, such as System C models or special assessment tools.

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