Integrated Hall sensors cut assembly costs

August 07, 2016 // By Graham Prophet
Hall-effect sensors by Infineon have been designed to allow automotive, industrial and consumer electronics to meet strict environmental standards. TLx496x family ICs are highly integrated, have precise switching points, a stable operation and a low power consumption. They are available as latch and switch-type sensors.

The TLx496x Hall sensors consume no more than 1.6 mA, a power consumption around 50% lower than comparable products. 5-V versions only consume 1.4 mA. High ESD robustness and the precise, stable magnetic switching points are suitable for systems where energy efficiency, robustness and precision matter. TLx496x Hall sensors reduce system costs. Two to four of the previously needed passive components are now redundant, which also reduces the amount of space they take up on the circuit board.

All of the TLx496x Hall sensors – switches and latches – have an integrated Hall element, a voltage regulator, choppers, an oscillator and an output driver. The voltage regulator powers the Hall element and the active circuits. The chopper ensures that the temperature remains stable and minimizes the effects of process fluctuations, which occur for three reasons: first, each single Hall sensor has a slightly different magnetic switching point as a result of the manufacturing process; second, the permanent magnets in the brushless DC (BLDC) motor lose magnetic field strength as temperature rises and third, the Hall output voltage is affected by stress and temperature. The TLx496x Hall sensors compensate all of these effects.

The TLE496x-xM series is suitable for automotive applications which generally are not exposed to overcurrent and with an operating voltage of 3.0 V to 5.5 V, typically in power windows and sunroofs, trunk locks, windshield wipers, seatbelts, camshafts, shift levers and the many controls used in BLDC motors. The latches’ (TLE4963-1M/2M) magnetic behaviour and switching points make them suitable for applications with precise index counting (for pole wheels or the recording of the rotor position) and for BLDC motors. The Hall switch (TLE4965-5M) is particularly suitable for the recording of switch and lever positions and the detection of open/close states.