Infineon has released two new package variants of its successful, market-proven differential Hall sensor family (with the TLE4924C and TLE4927C devices) for crankshaft applications. The new variants – the TLE4924CB and TLE4927CB – feature the same tried-and-tested integrated Back Bias (iBB) NdFeB magnet as the existing devices. The devices work by magnetically sensing an encoder fixed on the crankshaft axle.
In the case of magnetic pole wheels, the magnetic field can be read directly by the sensor so no additional equipment is required for sensing purposes. However, ferromagnetic target wheels (such as steel gear wheels) require an additional magnet field. This is generated by a magnet that is attached to the sensor during module assembly – often at the customer site.
To deliver optimal performance, the magnet has to be precisely mounted in line with design requirements. This can be a costly, challenging process – especially for less experienced module suppliers or newcomers to engine speed sensing. With their integrated Back Bias (iBB) packages, the TLE4924CB and TLE4927CB meet these challenges, combining ease of use with improved performance thanks to highly precise magnet mounting.
Features
- Integrated back-biasing permanent magnet for ferromagnetic target wheel application PG-SSOM-3-9
- Hidden adaptive hysteresis
- Large operating air gap
- Advanced performance due to dynamic self-calibration principle
- Digital output signal
- Wide operating temperature ranges
- Reverse voltage protection at Vs-pin
- Short-circuit and overtemperature protection of output
- Module-style package with two integrated capacitors:
- 4.7nF between Q and GND
- 4.7nF between Vs and GND: Required for micro cuts in power supply and optimal EMC robustness
- Automotive-qualified
Applications
- Gear wheel applications with back bias magnet
- Crankshafts
- Transmission
- Speedometers
- Industrial speed and position sensing
