KMXP MR Position Sensor

Transcription

1 KMXP MR Positio Sesor AMR liear positio sesor 2x6 DFN package, very compact Small wall thickess for large air gaps High operatig temperature of 50 C O the edge solderig possible DESCRIPTION Movig a KMXP sesor alog a magetic scale will produce a sie ad a cosie output sigal as a fuctio of its positio. I order to deliver satisfyig results, this will be achieved as log as the air gap betwee sesor edge ad magetic scale surface does ot exceed approximately half of the pole pitch. As the sesor priciple is based o the aisotropic mageto resistace effect, the sigal amplitudes are early idepedet o the magetic field stregth ad therefore air gap variatios do ot have a strog effect o the accuracy. The sesor detects a magetic gradiet field ad is thus almost isesitive to homogeous stray fields. Precise displacemet values will be obtaied by usig a amplifier i combiatio with a microcotroller or commercial sie/cosie iterpolator device. The maximal obtaiable precisio depeds strogly o the accuracy of the magetic scale ad o the distace sesor magetic scale. Precisio values of <% of the pole pitch are commo. FEATURES APPLICATIONS Cotactless agular positio measuremet Measuremet of liear displacemets, movemets, velocities i dirty eviromets High accuracy Very precise agular measuremet o the Low cost, low power circumferece usig pole wheels Failure detectio possible Torque measuremet i harsh eviromet User has total cotrol over sigal evaluatio Exteded temperature rage REACH, 3TG & ROHS compliat /8

2 PERFORMANCE SPECS PARAMETER SYMBOL COND. TYPE MIN TYP MAX UNIT. Operatig Limits max. supply voltage V cc,max all 0 V max. curret (both bridges I cc,max KMXP 000 KMXP 2000/5000 operatig temperature T op all C storage temperature T st all C 2. Sesor Specificatios (T=25 C Supply voltage V cc all 5 V pole pitch Air gap package frot magetic scale 2 Resistace (both bridges p D R b KMXP 000 KMXP 2000 KMXP 5000 KMXP 000 KMXP 2000 KMXP 5000 KMXP 000 KMXP 2000/ Output sigal rage V /V cc A, B all mv/v Offset voltage V off A, B all mv/v 3. Sesor Specificatios TC of amplitude TCSV A, C All %/K TC of resistace TCBR A, C All %/K TC of offset TCVoff A, C all µv/v/k = ;2 (bridge umber; Stress above oe or more of the limitig values may cause permaet damage to the device. Exposure to limitig values for exteded periods may affect device reliability. Other pole pitches o request 2 Typical values for covetioal magetic scales. Air gap for maximum accuracy depeds o the used scale. ma µm mm Ω 2/8

3 MEASUREMENT SET UP CONDITIONS PARAMETER SYMBOL UNIT CONDITION A. Set Up Coditios ambiet temperature T C T = 25 C (uless otherwise oted supply voltage V cc V Vcc = 5 V applied magetic field H ka/m H > 0 ka/m B. Sesor Specificatios (T=25 C, 360 tur, H=25 ka/m, Vo max>0, Vo mi<0 output sigal rage V / V cc mv/v V / V cc = (V max V mi / V cc sigal offset V off mv/v V off = (V max + V mi / V cc C. Sesor Specificatios (T=-25 C, +25 C ambiet temperatures T C T = -25 C, T 0 = +25 C, T 2 = +25 C TC of amplitude TCSV %/K TC of resistace TCBR %/K TC of offset TCVoff µv/(vk = ;2 (bridge umber TCV = ( T TCR = ( T TCVoff 2 2 V Vcc T R T V ( T2 Vcc V ( T V cc Voff( T2 Voff = ( T T ( T 00% ( T2 R ( T 00% R ( T 2 ( T BLOCK DIAGRAM c. -V2 -V GND Vcc +V +V2. c. Vcc2 -V2 -V GND Vcc +V +V2. c. Figure a: KMXP 000/2000 Figure b: KMXP /8

4 TYPICAL PERFORMANCE CURVES Figure 2: typical output sigal voltage depedig o sesor positio FUNCTION Figure 3: priciple fuctio of the sesor The KMXP sesors cosists of two mageto resistive Wheatstoe bridges, whose resistors are placed i a way that the characteristic magetic field distributio of a magetic scale with matchig pole pitch produces a sie ad a cosie sigal output, whe the sesor is moved alog the scale. I additio, some sesor types itegrate over more tha oe pole i order to improve sesor performace. 4/8

5 EXAMPLE FOR A PRINTED CIRCUIT BOARD ASSEMBLY PIN ASSIGNMENT The pi assigmet is pi compatible for all KMXP types ad allows a commo PCB layout for all types: Pi KMXP5000 Vcc2 -V2 -V GND Vcc +V +V2 N/C N/C N/C N/C N/C KMXP2000 N/C -V2 -V GND Vcc +V +V2 N/C N/C N/C N/C N/C KMXP000 N/C -V2 -V GND Vcc +V +V2 N/C N/C N/C N/C N/C 5/8

6 PHYSICAL DIMENSIONS Fig. 4: Physical dimesios of sesor package Reflow profile for this package accordig to IPC/JEDEC J-STD-020 Revisio D. (March /8

7 APPLICATION EXAMPLE Fig. 5: Exemplary hardware cofiguratio for the usage with a covetioal microcotroller usig a Aalog Devices AD8605 amplifier for the preprocessig of the sesor sigals. 7/8

8 ORDERING CODES Name KMXP 000 KMXP 2000 KMXP 5000 Pole pitch mm 2 mm 5 mm Article umber o request G-MRCO-050 G-MRCO-052 TECHNICAL CONTACT INFORMATION NORTH AMERICA EUROPE ASIA Measuremet Specialties, Ic. 000 Lucas Way Hampto, VA Uited States Phoe: Fax: sales@meas-spec.com Web: MEAS Deutschlad GmbH Hauert 3 D Dortmud Germay Phoe: +49-( Fax: +49-( ifo.de@meas-spec.com Web: Measuremet Specialties Chia Ltd. No. 26, Lagsha Road High-tech Park (North Nasha District, Shezhe Chia Phoe: Fax: ifo.c@meas-spec.com Web: The iformatio i this sheet has bee carefully reviewed ad is believed to be accurate; however, o resposibility is assumed for iaccuracies. Furthermore, this iformatio does ot covey to the purchaser of such devices ay licese uder the patet rights to the maufacturer. Measuremet Specialties, Ic. reserves the right to make chages without further otice to ay product herei. Measuremet Specialties, Ic. makes o warraty, represetatio or guaratee regardig the suitability of its product for ay particular purpose, or does Measuremet Specialties, Ic. assume ay liability arisig out of the applicatio or use of ay product or circuit ad specifically disclaims ay ad all liability, icludig without limitatio cosequetial or icidetal damages. Typical parameters ca ad do vary i differet applicatios. All operatig parameters must be validated for each customer applicatio by customer s techical experts. Measuremet Specialties, Ic. does ot covey ay licese uder its patet rights or the rights of others. 8/8