KMY/KMZ Linear Magnetic Field Sensors

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1 KMY22 KMY2 KMZ2 AMR sensor Ver high sensitivit Almost no hsteresis Various applications Available with internal magnet Available in several packages DESCRIPTION Due to its featured properties - high sensitivit and almost no hsteresis the KMY / KMZ sensors are used in a wide range of applications, like magnetic field measurement, revolution counters, proximit detecting, and position measurement. An uniaxial linear magnetic field will generate a linear output within the specified magnetic field range. FEATURES APPLICATIONS Output proportional to magnetic field strength with ver high sensitivit Ver small hsteresis Large operating temperature range, from - 4 C up to +15 C Highl reliable Contactless switch Detection of ver weak magnetic fields, like earth magnetic field, or field generated b small magnetic particles Detection of objects that distort non-local magnetic fields Revolution measurement on ferromagnetic gears With / without internal magnet Contactless displacement / position sensor 1/9

2 S in mv/v/ka/m KMY/KMZ Linear Magnetic Field Sensors DESCRIPTION An uniaxial linear magnetic field (in -direction) will generate a linear output within the specified magnetic field range. The sensor is available in two tpes: the KMY 2 M, KMY 21 M and KMZ 2 M sensor tpes contain intrinsic magnets which provide an auxiliar magnetic field (in x-direction) at the sensor die which prevents magnetic domains from flipping irregularl. Auxiliar Field Dependence If the dies MR174B or the components KMY22, KMY2S or KMZ2S are used, the auxiliar field has to be provided b the user. The dependence of the sensitivit with auxiliar field strength is depicted in the figure aside Figure 1: Sensitivit dependence on auxiliar field strength Hx in ka/m Auxiliar field strengths below Hx<1.5 ka/m are not recommended, as small disturbances ma flip the magnetization domains. Sometimes, the magnetic conditions in the application ma provide enough Hx bias field stabilization. MEAS German can provide advise for customer specific magnet arrangements. If a bias field Hx is not applied or Hx is less than 2.5 ka/m, the sensor ma be used onl in a limited field range H, depending on the present total bias field Hx,tot. In this case, it is strongl recommended to premagnetize the sensor, i.e. align all magnetic domains consistentl, prior to the measurement. Hx,tot is the sum of all acting magnetic fields in x direction at the sensor die. Do not use the sensor outside the safe operating area. Leaving the save operating area can destro an existing premagnetization and therefore will lead to unreproducible sensor signals. Figure 2: Safe operating area 2/9

3 CHARACTERISTIC VALUES / SENSOR SPECIFICATIONS Parameter Smbol Condition Min Tp Max Unit Operating Limits max. suppl voltage V cc,max 1 V max. current I cc,max 9 ma operating temperature T op C storage temperature T st C General Sensor Specifications TC of amplitude TCSV Condition A, C %/K TC of resistance TCBR Condition A, C %/K TC of offset TCVoff Condition A, C µv/v/k Sensor Specifications KMY 2 S, KMZ 2 S (T=25 C, Hx=3 ka/m externall) Suppl voltage V cc Condition A, B 5 V Bridge resistance R b Condition A, B Output signal range V /V cc Condition A, B mv/v Offset voltage V off /V cc Condition A, B mv/v Sensitivit S Condition A, B mv/v/ka/m Hsteresis V H /V cc Condition A, B µv/v Sensor Specifications KMY 2 M, KMZ 2 M (T=25 C, Hx=1.5±.5 ka/m internall) Suppl voltage V cc Condition A, B 5 V Bridge resistance R b Condition A, B Output signal range V /V cc Condition A, B mv/v Offset voltage V off /V cc Condition A, B mv/v Sensitivit S Condition A, B mv/v/ka/m Hsteresis V H /V cc Condition A, B µv/v Sensor Specifications KMY 21 M (T=25 C, Hx=2.5±1. ka/m internall) Suppl voltage V cc Condition A, B 5 V Bridge resistance R b Condition A, B Output signal range V /V cc Condition A, B mv/v Offset voltage V off /V cc Condition A, B %Vcc Sensitivit S Condition A, B mv/v/ka/m Hsteresis V H /V cc Condition A, B µv/v Stress above one or more of the limiting values ma cause permanent damage to the device. Exposure to limiting values for extended periods ma affect device reliabilit. 3/9

4 MEASUREMENT CONDITIONS Parameter Smbol Unit Condition Condition A: Set Up Conditions Ambient temperature T C 235 Measurement results are extrapolated to 25 C b using the given temperature coefficients Suppl voltage V cc V 5 Output voltage Reference half bridge V O V O /V cc mv mv/v V O=(V + -V - ) Output voltages are also given independentl on suppl voltage: example: Vo/Vcc=(V + -V - )/Vcc; measure MR half bridge against reference half bridge 2* 2 k.1% (KMY21M onl) for full bridge sensors (KMY2S, KMY2M, KMY22, KMZ2S, KMZ2M) for half bridge sensors (KMY 21 M) The output voltage of the MR half bridge is measured against a reference half bridge Condition B: Sensor Specifications (T=25 C, S-Tpe: Hx=3..5 ka/m) Output voltage range V O /V cc mv/v H ka/ m; VO V O,max VO,min Offset voltage V off /V cc mv/v H ; Voff VO H Sensitivit S (mv/v)/(ka/m) V H V H Hsteresis V H /V cc µv/v H in ka/m H ( V ( H 1kA/ m; ; H S : 1 1) V ( H 2 V ; H cc 1 1)) / V cc 4/9

5 Condition C: Sensor Specifications (reference temperatures T=-25 C, +125 C) Ambient temperatures T C T 1=-25 C, T =+25 C, T 2=+125 C TC of amplitude TCSV %/K 1 V / Vcc ( T2 TCV ( T 2 T ) 1 V ) V / V cc ( T ) 1 / V cc ( T1 ) 1% TC of resistance TCBR %/K TC of offset TCVoff (µv/v)/k TCR ( T 2 1 R( T2 ) R( T1 ) 1% T ) R( T ) 1 Voff ( T2 ) Voff ( T1 ) TCVoff ( T T ) SENSOR MODELS KMY 2 / KMY 22 / KMZ 2 The KMY and KMZ sensors are highl sensitive magnetic field sensors which utilize the anisotropic magneto resistance effect. The KMY 2 and KMZ 2 sensors contain a Wheatstone bridge. +Vo +Vcc Y X Y GND X -Vo Figure 3: Pad annotation and definition of field direction for KMY & KMZ 5/9

6 Output voltage in mv/v KMY/KMZ Linear Magnetic Field Sensors 15 Auxiliar field: Hx=3 ka/m 1 5 Figure 4: Characteristic output curve of KMY 2 S resp. KMZ 2 S for an auxiliar field strength of Hx=3 ka/m Field Strength H in ka/m 6/9

7 Vo(T)/Vo(+25 C) in % Rb(T)/Rb(+25 C) in % Output Voltage in mv/v KMY/KMZ Linear Magnetic Field Sensors KMY 21 In contrast to the KMY2 sensor products, the KMY 21 M consists of a half bridge, making the sensor well suited for dnamic measurements. Auxiliar field: Hx=2.5 ka/m 6 4 Y B B It contains an internal magnet, which provides an auxiliar filed of approx. 2.5 ka/m. X Figure 5: Characteristic curve for KMY21M -6 External Field H in ka/m TEMPERATURE DEPENDENCIES 1,4 1,8 1,2 1,6 1, 1,4 1,2,8 1,,6,8, Temperature in C Vo,min Vo(T)/Vo(+25 C) Vo,max, Temperature in C Rb,min Rb(T)/Rb(+25 C) Rb,max Figure 6: signal amplitude related to room temperature value Figure 7: bridge resistance related to room temperature value 7/9

8 PACKAGES SOT223 Recommended solder reflow process for all packages according to IPC/JEDEC J-STD-2D (Pb-Free Process) E-LINE 4 PIN Pin 1 UTDFN8 2.5X2.8 MM The sensitive area is positioned in the center of the housing. The bottom plate is designated to be a heat sink. It has no electrical connection to an pin.. DIE Die laout and dimensions on request. 8/9

9 ORDERING CODE DEVICE DIE PACKAGE INTERNAL MAGNET PART NUMBER KMY 2 S full bridge SOT-223 NO G-MRCO-6 KMY 2 M full bridge SOT-223 YES G-MRCO-1 KMY 21 M half bridge SOT-223 YES G-MRCO-11 KMZ 2 S full bridge E-Line NO G-MRCO-7 KMZ 2 M full bridge E-Line YES G-MRCO-3 KMY 22 full bridge UTDFN8 NO on request ORDERING INFORMATION NORTH AMERICA EUROPE ASIA Measurement Specialties, Inc. 1 Lucas Wa Hampton, VA United States Phone: Fax: [email protected] Web: MEAS Deutschland GmbH Hauert 13 D Dortmund German Phone: +49-() Fax: +49-() [email protected] Web: Measurement Specialties China Ltd. No. 26, Langshan Road High-tech Park (North) Nanshan District, Shenzhen China Phone: Fax: [email protected] Web: The information in this sheet has been carefull reviewed and is believed to be accurate; however, no responsibilit is assumed for inaccuracies. Furthermore, this information does not conve to the purchaser of such devices an license under the patent rights to the manufacturer. Measurement Specialties, Inc. reserves the right to make changes without further notice to an product herein. Measurement Specialties, Inc. makes no warrant, representation or guarantee regarding the suitabilit of its product for an particular purpose, nor does Measurement Specialties, Inc. assume an liabilit arising out of the application or use of an product or circuit and specificall disclaims an and all liabilit, including without limitation consequential or incidental damages. Tpical parameters can and do var in different applications. All operating parameters must be validated for each customer application b customer s technical experts. Measurement Specialties, Inc. does not conve an license under its patent rights nor the rights of others. 9/9

10 Mouser Electronics Authorized Distributor Click to View Pricing, Inventor, Deliver & Lifeccle Information: Measurement Specialties: G-MRCO-6 G-MRCO-1 G-MRCO-11