Magnetic field sensor
Magnetic field sensor
Magnetic field sensor
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Philips SemiconductorsProduct specification<strong>Magnetic</strong> <strong>field</strong> <strong>sensor</strong>KMZ10A1DESCRIPTIONThe KMZ10A1 is an extremely sensitive magnetic <strong>field</strong><strong>sensor</strong>, employing the magnetoresistive effect of thin-filmpermalloy. Its properties enable this <strong>sensor</strong> to be used in awide range of applications such as navigation, current andearth magnetic <strong>field</strong> measurement etc. The specialarrangement of the sensing chip allows the construction ofcoils for switching the auxiliary <strong>field</strong> (H x ) along the lengthaxis of the <strong>sensor</strong>. The <strong>sensor</strong> can be operated at anyfrequency between DC and 1 MHz.Hhandbook, halfpage yH xPINNING1 2 3 4MGL420PIN SYMBOL DESCRIPTION1 +V O output voltage2 GND ground3 −V O output voltage4 V CC supply voltageFig.1 Simplified outline.QUICK REFERENCE DATASYMBOL PARAMETER MIN. TYP. MAX. UNITV CC DC supply voltage − 5 − VH y magnetic <strong>field</strong> strength −0.5 − +0.5 kA/mH x auxiliary <strong>field</strong> − 0.5 − kA/mS sensitivity − 14 −mV ⁄ V----------------kA ⁄ mS s sensitivity (with switched H x ) − 22 −mV ⁄ V----------------kA ⁄ mR bridge bridge resistance 0.85 − 1.75 kΩV offset offset voltage −1.5 − +1.5 mV/VCIRCUIT DIAGRAMhandbook, full pagewidthMLC7161234+V O GND –V OV CCFig.2 Simplified circuit diagram.1998 Apr 06 2
Philips SemiconductorsProduct specification<strong>Magnetic</strong> <strong>field</strong> <strong>sensor</strong>KMZ10A1LIMITING VALUESIn accordance with the Absolute Maximum Rating System (IEC 134).SYMBOL PARAMETER CONDITIONS MIN. MAX. UNITV CC DC supply voltage − 9 VP tot total power dissipation up to T amb = 132 °C − 100 mWT stg storage temperature −65 +150 °CT bridge bridge operating temperature −40 +150 °C150handbook, halfpageMSA927Ptot(mW)100500050 100 150T amb ( o C)Fig.3 Power derating curve.1998 Apr 06 3
Philips SemiconductorsProduct specification<strong>Magnetic</strong> <strong>field</strong> <strong>sensor</strong>KMZ10A1APPLICATION INFORMATIONA problem with measuring weak magnetic <strong>field</strong>s is that precision is limited by drift in both the <strong>sensor</strong> and amplifier offset.In these instances, it is possible to take advantage of the ‘flipping’ characteristics of the KMZ10 series to generate anoutput that is independent of offset. The <strong>sensor</strong>, located in a coil connected to a current pulse generator producingmagnetic <strong>field</strong> pulses periodically reversed by alternate positive and negative going current pulses, is continually flippedfrom its normal to its reversed polarity and back again. The polarity of the offset however, remains unchanged, so theoffset itself can be eliminated by passing the output signal through a filter circuit.handbook, full pagewidthH xcoilH, y ,,,<strong>sensor</strong>V oM xoffsetH y1 2 3 4M x(a)(c)currentpolarizationV ooffset(b)timeMBC925(a) Set-up.(b) Pulse diagram.(c) Sensor output characteristics.Fig.8 Measuring weak magnetic <strong>field</strong>s with the KMZ10A1.1998 Apr 06 6
Philips SemiconductorsProduct specification<strong>Magnetic</strong> <strong>field</strong> <strong>sensor</strong>KMZ10A1PACKAGE OUTLINEPlastic single-ended flat package; 4 in-line leadsSOT195EQb 1ADchipL 1L1 2 3 4e 1eb pc0 1 4 mmscaleDIMENSIONS (mm are the original dimensions)UNIT A b p b 1 c D E e e 1mm1.81.60.480.400.70.50.450.395.25.04.84.43.751.25L14.512.7L (1) 1max.2Q0.80.7Notes1. Terminal dimensions within this zone are uncontrolled to allow for flow of plastic and terminal irregularities.OUTLINEVERSIONREFERENCESIEC JEDEC EIAJEUROPEANPROJECTIONISSUE DATESOT195 97-06-021998 Apr 06 7
Philips SemiconductorsProduct specification<strong>Magnetic</strong> <strong>field</strong> <strong>sensor</strong>KMZ10A1DEFINITIONSData Sheet StatusObjective specification This data sheet contains target or goal specifications for product development.Preliminary specification This data sheet contains preliminary data; supplementary data may be published later.Product specification This data sheet contains final product specifications.Limiting valuesLimiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one ormore of the limiting values may cause permanent damage to the device. These are stress ratings only and operationof the device at these or at any other conditions above those given in the Characteristics sections of the specificationis not implied. Exposure to limiting values for extended periods may affect device reliability.Application informationWhere application information is given, it is advisory and does not form part of the specification.LIFE SUPPORT APPLICATIONSThese products are not designed for use in life support appliances, devices, or systems where malfunction of theseproducts can reasonably be expected to result in personal injury. Philips customers using or selling these products foruse in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from suchimproper use or sale.1998 Apr 06 8
Philips SemiconductorsProduct specification<strong>Magnetic</strong> <strong>field</strong> <strong>sensor</strong>KMZ10A1NOTES1998 Apr 06 9
Philips SemiconductorsProduct specification<strong>Magnetic</strong> <strong>field</strong> <strong>sensor</strong>KMZ10A1NOTES1998 Apr 06 10
Philips SemiconductorsProduct specification<strong>Magnetic</strong> <strong>field</strong> <strong>sensor</strong>KMZ10A1NOTES1998 Apr 06 11
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