KMZ52

DISCRETE SEMICONDUCTORS DATA SHEET M3D396 KMZ52 Magnetic Field Sensor Product specification 2000 Jun 09 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 KMZ52 is an extremely sensitive magnetic field sensor, employing the magnetoresistive effect of thin-film permalloy. The sensor contains two magnetoresistive Wheatstone bridges physically offset from one another by 90° and integrated compensation and set/reset coils. The integrated compensation coils allow magnetic field measurement with current feedback loops to generate outputs that are independent of drift in sensitivity. The orientation of sensitivity may be set or changed (flipped) by means of the integrated set/reset coils. A short current pulse should be applied to the compensation coils 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, the output is made independent of sensor and amplifier offset. PINNING SYMBOL +Iflip2 VCC2 GND2 +Icomp2 GND1 +Icomp1 −Icomp1 −VO1 +VO1 −Iflip1 +Iflip1 VCC1 −Icomp2 −VO2 +VO2 −Iflip2 PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 KMZ52 DESCRIPTION flip coil bridge supply voltage ground compensation coil ...