KMZ51

DISCRETE SEMICONDUCTORS DATA SHEET M3D315 KMZ51 Magnetic field sensor Product specification Supersedes data of 1996 Nov 15 File under Discrete Semiconductors, SC17 1998 Mar 24 Philips Semiconductors Product specification Magnetic field sensor FEATURES High sensitivity Integrated compensation coil Integrated set/reset coil. APPLICATIONS Navigation Current and earth magnetic field measurement Traffic detection. DESCRIPTION The KMZ51 is an extremely sensitive magnetic field sensor, employing the magnetoresistive effect of thin-film permalloy. The sensor contains one magnetoresistive Wheatstone bridge and integrated compensation and set/reset conductors. The integrated compensation conductor allows magnetic field measurement with current feedback loops to generate an output that is independent of drift in sensitivity. With the integrated set/reset conductor the orientation of sensitivity may be set or changed (flipped). A short current pulse on this conductor is needed to recover (set) the sensor after exposure to strong disturbing magnetic fields. A negative current pulse will reset the sensor to reversed sensitivity. By use of periodically alternated flipping pulses and a lock-in amplifier, output will become independent of sensor and amplifier offset. QUICK REFERENCE DATA SYMBOL VCC S Voffset Rbridge Rcomp Acomp Rflip Iflip (min) tflip (min) Notes PARAMETER bridge supply voltage sensitivity (uncompensated) offset voltage bridge resistance compensation coil resistan...