KMXP MR Position Sensor * * * * * AMR linear position sensor 2x6 DFN package, very compact Small wall thickness for large air gaps High operating temperature of 150C On the edge soldering possible * DESCRIPTION Moving a KMXP sensor along a magnetic scale will produce a sine and a cosine output signal as a function of its position. In order to deliver satisfying results, this will be achieved as long as the air gap between sensor edge and magnetic scale surface does not exceed approximately half of the pole pitch. As the sensor principle is based on the anisotropic magneto resistance effect, the signal amplitudes are nearly independent on the magnetic field strength and therefore air gap variations do not have a strong effect on the accuracy. The sensor detects a magnetic gradient field and is thus almost insensitive to homogenous stray fields. Precise displacement values will be obtained by using an amplifier in combination with a microcontroller or commercial sine/cosine interpolator device. The maximal obtainable precision depends strongly on the accuracy of the magnetic scale and on the distance sensor - magnetic scale. Precision values of <1% of the pole pitch are common. FEATURES APPLICATIONS * Contactless angular position measurement * * * * * * * High accuracy Low cost, low power Failure detection possible User has total control over signal evaluation Extended temperature range REACH, 3TG & ROHS compliant * KMXP * Measurement of linear displacements, movements, velocities in dirty environments Very precise angular measurement on the circumference using pole wheels Torque measurement in harsh environment www.meas-spec.com 1/8 2014-May KMXP Magneto Resistive Position Sensor PERFORMANCE SPECS PARAMETER SYMBOL COND. TYPE MIN TYP M AX UNIT 1. Operating Limits max. supply voltage Vcc,max all 10 V max. current (both bridges) Icc,max KMXP 1000 KMXP 2000/5000 5 10 mA operating temperature Top all -40 +150 C storage temperature Tst all -40 +125 C 2. Sensor Specifications (T=25 C) Supply voltage Vcc all p KMXP 1000 KMXP 2000 KMXP 5000 Air gap package front - magnetic scale 2) D KMXP 1000 KMXP 2000 KMXP 5000 Resistance (both bridges) Rb KMXP 1000 KMXP 2000/5000 pole pitch 1) 5 V 1000 2000 5000 m 0.1 0.2 0.5 0.4 0.8 2 0.8 1.8 4 mm 2000 1000 3000 1500 4000 2000 Vn/Vcc A, B all 18 22 26 mV/V Vn off A, B all -1 0 +1 mV/V TC of amplitude TCSV A, C All -0.35 %/K TC of resistance TCBR A, C All +0.35 %/K TC of offset TCVoff A, C all Output signal range Offset voltage 3. Sensor Specifications -4 0 +4 V/V/K n = 1;2 (bridge number); 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. 1) Other pole pitches on request 2) Typical values for conventional magnetic scales. Air gap for maximum accuracy depends on the used scale. KMXP www.meas-spec.com 2/8 2014-May KMXP Magneto Resistive Position Sensor MEASUREMENT SET UP CONDITIONS PARAMETER SYMBOL UNIT CONDITION T C T = 25 C (unless otherwise noted) Vcc V Vcc = 5 V H kA/m A. Set Up Conditions ambient temperature supply voltage applied magnetic field H > 10 kA/m B. Sensor Specifications (T=25 C, 360 turn , H=25 kA/m , Vomax>0, Vomin<0) output signal range Vn / Vcc mV/V Vn / Vcc = (Vn max - Vn min) / Vcc Voff n mV/V Voff n = (Vn max + Vn min) / Vcc signal offset C. Sensor Specifications (T=-25C, +125C) ambient temperatures T1 = -25 C, T0 = +25 C, T2 = +125 C T C TC of amplitude TCSV %/K Vn V (T2 ) - n (T1 ) 1 V Vcc TCV = cc 100% Vn (T2 - T1 ) (T1 ) Vcc TC of resistance TCBR %/K TCR = TC of offset TCVoff V/(VK) 1 R (T ) - Rn (T1 ) n 2 100% (T2 - T1 ) Rn (T1 ) TCVoff n = Voff n (T2 ) - Voff n (T1 ) (T2 - T1 ) n = 1;2 (bridge number) BLOCK DIAGRAM 1 2 n. c. -V2 3 4 5 -V1 GND Vcc 6 7 8 +V1 +V2 n. c. 1 3 Vcc2 -V2 Figure 1a: KMXP 1000/2000 KMXP 2 4 5 6 -V1 GND Vcc1 +V1 7 8 +V2 n. c. Figure 1b: KMXP 5000 www.meas-spec.com 3/8 2014-May KMXP Magneto Resistive Position Sensor TYPICAL PERFORMANCE CURVES Figure 2: typical output signal voltage depending on sensor position FUNCTION Figure 3: principle function of the sensor The KMXP sensors consists of two magneto resistive Wheatstone bridges, whose resistors are placed in a way that the characteristic magnetic field distribution of a magnetic scale with matching pole pitch produces a sine and a cosine signal output, when the sensor is moved along the scale. In addition, some sensor types integrate over more than one pole in order to improve sensor performance. KMXP www.meas-spec.com 4/8 2014-May KMXP Magneto Resistive Position Sensor EXAMPLE FOR A PRINTED CIRCUIT BOARD ASSEMBLY PIN ASSIGNMENT The pin assignment is pin compatible for all KMXP types and allows a common PCB layout for all types: Pin 1 2 3 4 5 6 7 8 9 10 11 12 KMXP5000 Vcc2 -V2 -V1 GND Vcc1 +V1 +V2 N/C N/C N/C N/C N/C KMXP2000 N/C -V2 -V1 GND Vcc +V1 +V2 N/C N/C N/C N/C N/C KMXP1000 N/C -V2 -V1 GND Vcc +V1 +V2 N/C N/C N/C N/C N/C KMXP www.meas-spec.com 5/8 2014-May KMXP Magneto Resistive Position Sensor PHYSICAL DIMENSIONS Fig. 4: Physical dimensions of sensor package Reflow profile for this package according to IPC/JEDEC J-STD-020 Revision D.1 (March 2008). KMXP www.meas-spec.com 6/8 2014-May KMXP Magneto Resistive Position Sensor APPLICATION EXAMPLE Fig. 5: Exemplary hardware configuration for the usage with a conventional microcontroller using an Analog Devices AD8605 amplifier for the preprocessing of the sensor signals. KMXP www.meas-spec.com 7/8 2014-May KMXP Magneto Resistive Position Sensor ORDERING CODES Name KMXP 1000 KMXP 2000 KMXP 5000 Pole pitch 1 mm 2 mm 5 mm Article number on request G-MRCO-050 G-MRCO-052 TECHNICAL CONTACT 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. KMXP www.meas-spec.com 8/8 2014-May Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: TE Connectivity: G-MRCO-051 G-MRCO-052 G-MRCO-050