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A chopped Hall sensor with small jitter and programmable "True Power-on" function

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4 Author(s)
Motz, M. ; Infineon Technol. Austria AG, Villach, Austria ; Draxelmayr, D. ; Werth, T. ; Forster, B.

A chopped Hall sensor for camshaft applications is presented which provides a programmable "True Power-on" switching level effective after the power-up phase. The proposed chopping technique and self-compensation methods for temperature drift and technology spread provide a correct output state immediately after power-on even at zero speed of the target wheel. The circuits improve the magnetic offsets from 5 to 10 mT to below 200 μT in a bandwidth of 30 kHz and stabilize the spread of the magnetic switching points from 20% to <2% in a temperature range from -40°C to 175°C. The novel combination of chopping and enhanced digital self-calibration algorithm adjusts the magnetic switching point and improves phase accuracy to <0.5°, independent of air gap variations between sensor and wheel. An end-of-line calibration for the customer is implemented using surface micromachined cavity fuses which offer a reliable function higher than 195°C.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:40 ,  Issue: 7 )