KMY/KMZ Linear Magnetic Field Sensors KMY22 KMY20 AMR sensor Very high sensitivity Almost no hysteresis Various applications Available with internal magnet Available in several packages KMZ20 DESCRIPTION Due to its featured properties - high sensitivity and almost no hysteresis - the KMY / KMZ sensors are used in a wide range of applications, like magnetic field measurement, revolution counters, proximity detecting, and position measurement. An uniaxial linear magnetic field will generate a linear output within the specified magnetic field range. FEATURES Output proportional to magnetic field strength with very high sensitivity Very small hysteresis APPLICATIONS Detection of very weak magnetic fields, like earth magnetic field, or field generated by small magnetic particles Detection of objects that distort non-local magnetic fields Large operating temperature range, from 40C up to +150 C Revolution measurement on ferromagnetic gears Highly reliable Contactless switch With / without internal magnet Contactless displacement / position sensor KMY/KMZ Rev 4 www.meas-spec.com 1/9 2012-December KMY/KMZ Linear Magnetic Field Sensors DESCRIPTION An uniaxial linear magnetic field (in y-direction) will generate a linear output within the specified magnetic field range. The sensor is available in two types: the KMY 20 M, KMY 21 M and KMZ 20 M sensor types contain intrinsic magnets which provide an auxiliary magnetic field (in x-direction) at the sensor die which prevents magnetic domains from flipping irregularly. Auxiliary Field Dependence 15 S in mV/V/kA/m If the dies MR174B or the components KMY22, KMY20S or KMZ20S are used, the auxiliary field has to be provided by the user. The dependence of the sensitivity with auxiliary field strength is depicted in the figure aside. 10 5 0 0 1 Figure 1: Sensitivity dependence on auxiliary field strength 2 3 4 5 Hx in kA/m Auxiliary field strengths below Hx<1.5 kA/m are not recommended, as small disturbances may flip the magnetization domains. Sometimes, the magnetic conditions in the application may provide enough Hx bias field stabilization. MEAS Germany 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 may be used only in a limited field range Hy, depending on the present total bias field Hx,tot. In this case, it is strongly recommended to `premagnetize' the sensor, i.e. align all magnetic domains consistently, 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 destroy an existing premagnetization and therefore will lead to unreproducible sensor signals. Figure 2: Safe operating area KMY/KMZ Rev 4 www.meas-spec.com 2/9 2012-December KMY/KMZ Linear Magnetic Field Sensors CHARACTERISTIC VALUES / SENSOR SPECIFICATIONS Parameter Symbol Condition Min Typ Max Unit Operating Limits max. supply voltage Vcc,max 10 V max. current Icc,max 9 mA operating temperature Top -40 +150 C storage temperature Tst -40 +150 C General Sensor Specifications TC of amplitude TCSV Condition A, C -0.36 -0.32 -0.28 %/K TC of resistance TCBR Condition A, C +0.27 +0.32 +0.37 %/K TC of offset TCVoff Condition A, C -4 0 +4 V/V/K Sensor Specifications KMY 20 S, KMZ 20 S (T=25 C, Hx=3 kA/m externally) Supply voltage Vcc Condition A, B Bridge resistance Rb Condition A, B 1200 1700 2200 Output signal range V0/Vcc Condition A, B 16 20 24 mV/V Offset voltage Voff/Vcc Condition A, B -1 0 +1 mV/V Sensitivity S Condition A, B 3.7 4.7 5.7 mV/V/kA/m Hysteresis VH/Vcc Condition A, B - - 50 V/V 5 V Sensor Specifications KMY 20 M, KMZ 20 M (T=25 C, Hx=1.50.5 kA/m internally) Supply voltage Vcc Condition A, B Bridge resistance Rb Condition A, B 1200 1700 2200 Output signal range V0/Vcc Condition A, B 16 20 24 mV/V Offset voltage Voff/Vcc Condition A, B -1.5 0 +1.5 mV/V Sensitivity S Condition A, B 4 5.5 7 mV/V/kA/m Hysteresis VH/Vcc Condition A, B - - 50 V/V 5 V Sensor Specifications KMY 21 M (T=25 C, Hx=2.51.0 kA/m internally) Supply voltage Vcc Condition A, B Bridge resistance Rb Condition A, B 1100 1500 1900 Output signal range V0/Vcc Condition A, B 8 9.5 12 mV/V Offset voltage Voff /Vcc Condition A, B 48 50 52 %Vcc Sensitivity S Condition A, B 2.05 2.50 3.10 mV/V/kA/m Hysteresis VH/Vcc Condition A, B - - 50 V/V 5 V Stress above one or more of the limiting values may cause permanent damage to the device. Exposure to limiting values for extended periods may affect device reliability. KMY/KMZ Rev 4 www.meas-spec.com 3/9 2012-December KMY/KMZ Linear Magnetic Field Sensors MEASUREMENT CONDITIONS Parameter Symbol Unit Condition Condition A: Set Up Conditions Ambient temperature Supply voltage Output voltage T C Vcc VO VO/Vcc V mV mV/V Reference half bridge 235 Measurement results are extrapolated to 25C by using the given temperature coefficients 5 VO=(V0+ -V0- ) Output voltages are also given independently on supply voltage: example: Vo/Vcc=(V0+ -V0- )/Vcc; measure MR half bridge against reference half bridge 2* 2 k 0.1% (KMY21M only) for full bridge sensors (KMY20S, KMY20M, KMY22, KMZ20S, KMZ20M) 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-Type: Hx=3.00.5 kA/m) Output voltage range VO/Vcc mV/V Offset voltage Voff/Vcc mV/V S (mV/V)/(kA/m) Sensitivity Hysteresis VH/Vcc V/V H y 7 ... 7 kA / m; VO VO,max VO,min H y 0; Voff VO H y H y 1 kA / m; S : V0 H y V0 H y 2 Vcc Hy in kA/m (V0 ( H y 0; H y 1 1) V0 ( H y 0; H y 1 1)) / Vcc KMY/KMZ Rev 4 www.meas-spec.com 4/9 2012-December KMY/KMZ Linear Magnetic Field Sensors Condition C: Sensor Specifications (reference temperatures T=-25C, +125C) Ambient temperatures TC of amplitude T TCSV C %/K TC of resistance TCBR %/K TC of offset TCVoff (V/V)/K T1=-25 C, T0=+25 C, T2=+125 C TCV V / V (T ) V0 / Vcc (T1 ) 1 0 cc 2 100% (T2 T1 ) V0 / Vcc (T1 ) TCR R(T2 ) R(T1 ) 1 100% (T2 T1 ) R(T1 ) TCVoff Voff (T2 ) Voff (T1 ) (T2 T1 ) SENSOR MODELS KMY 20 / KMY 22 / KMZ 20 The KMY and KMZ sensors are highly sensitive magnetic field sensors which utilize the anisotropic magneto resistance effect. The KMY 20 and KMZ 20 sensors contain a Wheatstone bridge. +Vo +Vcc Y X Y X GND 1 2 3 4 -Vo Figure 3: Pad annotation and definition of field direction for KMY & KMZ KMY/KMZ Rev 4 www.meas-spec.com 5/9 2012-December KMY/KMZ Linear Magnetic Field Sensors 15 Auxiliary field: Hx=3 kA/m Figure 4: Characteristic output curve of KMY 20 S resp. KMZ 20 S for an auxiliary field strength of Hx=3 kA/m Output voltage in mV/V 10 5 0 -5 -4 -3 -2 -1 0 1 2 3 4 5 -5 -10 -15 Field Strength Hy in kA/m KMY/KMZ Rev 4 www.meas-spec.com 6/9 2012-December KMY/KMZ Linear Magnetic Field Sensors KMY 21 In contrast to the KMY20 sensor products, the KMY 21 M consists of a half bridge, making the sensor well suited for dynamic measurements. 6 Auxiliary field: Hx=2.5 kA/m Output Voltage in mV/V 4 Y X B B It contains an internal magnet, which provides an auxiliary filed of approx. 2.5 kA/m. 2 0 -5 -4 -3 -2 -1 0 1 2 3 4 5 -2 -4 -6 Figure 5: Characteristic curve for KMY21M External Field Hy in kA/m TEMPERATURE DEPENDENCIES 1,4 1,8 1,6 Rb(T)/Rb(+25C) in % Vo(T)/Vo(+25C) in % 1,2 1,0 0,8 0,6 0,4 -25 1,4 1,2 1,0 0,8 0 25 50 75 100 0,6 -25 125 0 25 Vo,min Vo(T)/Vo(+25C) Rb,min Vo,max Figure 6: signal amplitude related to room temperature value KMY/KMZ Rev 4 50 75 100 125 Tem perature in C Tem perature in C Rb(T)/Rb(+25C) Rb,max Figure 7: bridge resistance related to room temperature value www.meas-spec.com 7/9 2012-December KMY/KMZ Linear Magnetic Field Sensors PACKAGES SOT223 Recommended solder reflow process for all packages according to IPC/JEDEC J-STD-020D (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 any pin. . DIE Die layout and dimensions on request. KMY/KMZ Rev 4 www.meas-spec.com 8/9 2012-December KMY/KMZ Linear Magnetic Field Sensors ORDERING CODE DEVICE DIE PACKAGE INTERNAL MAGNET PART NUMBER KMY 20 S full bridge SOT-223 NO G-MRCO-006 KMY 20 M full bridge SOT-223 YES G-MRCO-001 KMY 21 M half bridge SOT-223 YES G-MRCO-011 KMZ 20 S full bridge E-Line NO G-MRCO-007 KMZ 20 M full bridge E-Line YES G-MRCO-003 KMY 22 full bridge UTDFN8 NO on request ORDERING INFORMATION NORTH AMERICA EUROPE ASIA Measurement Specialties, Inc. 1000 Lucas Way Hampton, VA 23666 United States Phone: +1-800-745-8008 Fax: +1-757-766-4297 Email: sales@meas-spec.com Web: www.meas-spec.com MEAS Deutschland GmbH Hauert 13 D-44227 Dortmund Germany Phone: +49-(0)231-9740-0 Fax: +49-(0)231-9740-20 Email: info.de@meas-spec.com Web: www.meas-spec.com Measurement Specialties China Ltd. No. 26, Langshan Road High-tech Park (North) Nanshan District, Shenzhen 518057 China Phone: +86-755-33305088 Fax: +86-755-33305099 Email: info.cn@meas-spec.com Web: www.meas-spec.com The information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsibility is assumed for inaccuracies. Furthermore, this information does not convey to the purchaser of such devices any license under the patent rights to the manufacturer. Measurement Specialties, Inc. reserves the right to make changes without further notice to any product herein. Measurement Specialties, Inc. makes no warranty, representation or guarantee regarding the suitability of its product for any particular purpose, nor does Measurement Specialties, Inc. assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. Typical parameters can and do vary in different applications. All operating parameters must be validated for each customer application by customer's technical experts. Measurement Specialties, Inc. does not convey any license under its patent rights nor the rights of others. KMY/KMZ Rev 4 www.meas-spec.com 9/9 2012-December Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: TE Connectivity: G-MRCO-003