KMXP MR Position Sensor
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• AMR linear position sensor
• 2x6 DFN package, very compact
• Small wall thickness for large air gaps
• High operating temperature of 150°C
• 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 exce ed ap proximately 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 streng th and theref ore air gap varia tion s do not ha ve a str ong eff ect on the accur acy. T he se nsor
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
comm er cial s ine/cos i ne int erpol ator de vice. The m ax im al obtai nab le pr ecis i on d e pends strongly on the acc ur ac y
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
• Measurement of linear disp lac ements,
movements, velocities in dirty environments
• High accuracy
• Low cost, low power
• Failure detection possible
• User has total control over signal evaluation
• Extended temperature range
• REACH, 3TG & ROHS compliant
• Very precise ang ul ar m easurement on the
circumference using pole wheels
• Torque measurement in harsh environment
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PERFORMANCE SPECS
PARAMETER SYMBOL COND. TYPE MIN TYP MAX UNIT
1. Operating L imits
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)
Suppl y voltage V
cc
all
5
V
pole pitch 1) p KMXP 1000
KMXP 2000
KMXP 5000 1000
2000
5000
µm
Air gap package front –
magnetic scale 2) D KMXP 1000
KMXP 2000
KMXP 5000
0.1
0.2
0.5
0.4
0.8
2
0.8
1.8
4
mm
Resistance
(both bridges) Rb KMXP 1000
KMXP 2000/5000 2000
1000 3000
1500 4000
2000 Ω
Output signal range ∆Vn/Vcc A, B all 18 22 26 mV/V
Offset voltage Vn off A, B all -1 0 +1 mV/V
3. Sensor Specifications
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 -4 0 +4 µV/V/K
n = 1;2 (bridge num ber); Stress above one or more of the limiti ng values may caus e permanent damage to the devic e. Exposure to limi ting
values for extended periods may affect device reli abili t y.
1) Other pole pitches on request
2) Typical values for conventional magnetic scales. Air gap for maximum accuracy depends on the used scale.
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MEASUREMENT SET UP CONDITIONS
PARAMETER SYMBOL UNIT CONDITION
A. Set Up Conditions
ambient temperature T °C T = 2 5 °C (unless otherwise noted)
supply voltage Vcc V Vcc = 5 V
applied magneti c field H kA/m H > 10 kA/m
B. Sensor Specifications (T=25 °C, 360° turn , H=25 kA/m , Vomax>0, Vomin<0)
output signal range ∆V
n
/ V
cc
mV/V ∆Vn / Vcc = (Vn max – Vn min) / Vcc
signal offset V
off n
mV/V Voff n = (Vn max + Vn min) / Vcc
C. Sensor Specifications (T=-25°C, +125°C)
ambient temperatures T °C T1 = -25 °C, T0 = +25 °C, T2 = +125 °C
TC of amplitude TCSV %/K
%100
)(
)()(
)( 1
1
12
12
⋅
∆
∆
−
∆
⋅
−
=
T
VV
T
VV
T
VV
TT
TCV
cc
n
cc
n
cc
n
TC of resistance TCBR %/K
%
100
)
()()(
)
(1
1
12
12
⋅
−
⋅
−
=TR T
RT
R
T
T
TCR
n
nn
TC of offset TCVoff µV/(VK)
)( )(
)(
12
12
TT TVoffTVoff
TCVoff
nn
n
−
−
=
n = 1;2 (bridge number)
BLOCK DIAGRAM
n. c.
-V2
-V1
GND
Vcc
+V1
+V2
1
2
3
4
5
6
7
8
n. c.
n. c.
Vcc2
-V2
-V1
GND
Vcc1
+V1
+V2
1
2
3
4
5
6
7
8
Figure 1a: KMXP 1000/2000
Figure 1b: KMXP 5000
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TYPICAL PERFORMANCE CURVES
Figure 2: typical output signal v oltage depending on sensor posit ion
FUNCTION
Figure 3: principle function of the sensor
The KMXP s ensors c onsists of two magneto r esistive W heatstone bridges, whose r esistors are p laced in a way
that the characteristic magnetic field distribution of a magnetic scale with matching pole pitch produces a sine
and a cosine s ignal ou tput, when t he sensor is moved alon g the sc ale. In addit ion, som e sensor t ypes integrate
over more than one pole in order to improve sensor performance.
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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
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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).
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APPLICAT ION E XAMPLE
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.
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ORDERING CO DES
Name KMXP 1000 KMXP 2000 KMXP 5000
Pole pi tch
1 mm
2 mm
5 mm
Articl e number on request G-MRCO-050 G-MRCO-052
TECHNICAL CONTACT INFORMATION
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Email: sales@meas-spec.com
Web: www.meas-spec.com
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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. Measurem ent Specialt ies, I nc. reserves the right to make c hanges without further not ic e to any product herein. Measurement
Specialti es, Inc. makes no warran ty, represent ation or guarantee re garding the s uitabili ty of its product for any part icular 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
Specialti es, Inc. does not convey any lic ense under its patent rights nor the rights of others.
