EKW01 Evaluation Kit for Angle Measurement
Contents
1. and length resolu tion with a phase shift of 90 e Resolution for incremental encoders Short Description SENS TEC The signal processing of the MR sensor signals is carried out by means of the interpolation ASIC It is based on amplifiers A D converters and logic circuits By means of the amplifier the signals are amplified in such a way that the A D converter works in an optimized range The amplified sensor signals are led to the SIN and COS connections These connections should not be used during operation because loading of the circuit could falsify the measurement signal The sensor signal is output as rectangular signals with a 90 phase shift and the appropriate resolution at the AX and BX connections green and red LED When using the corresponding measurement scale the required input signal for the interpolation ASIC is provided by the LK14 LK16 LK29 or LK40 AMR sensor The interpolation generates a multiple of the basic period of the system An interpolation factor of 1 is equivalent to a comparator and both sensor signals have a resolution of 4 flanks www sensitec com User Manual Sensitec GmbH Page 5 of 12 Subject to technical changes August 13 2008 EKW01 Evaluation Kit for Angle Measurement Technical Data Power supply Current consumption Temperature range Input signal Output signal Pin Assignment 5 VDC 10 lt 30 mA output active 20 up to 70 C differential 100 mV 20 square2. wave phase shift 90 Function 5 VDC power supply Ground Incremental output track A Incremental output track B Amplifier output SIN Amplifier output COS Additional ground 5 VDC power supply for MR sensor Cos 1 input for MR sensor Cos 2 input for MR sensor 11 FS2 Sin 2 input for MR sensor 12 FS1 Sin 1 input for MR sensor 13 GND1 Ground for MR sensor Pin Configuration EA nl 0060601 Connector MR Sensor VDD1 FC1 FC2 FS2 FSi GND1 Jumper for EEPROM Configuration EEPROM 3 EEPROM 2 EEPROM 1 le www sensitec com Sensitec GmbH vont AX SIN GNDI BX cas Power Supply Output Signal User Manual Page 6 of 12 GND1 SENS TEC Pin Operation Nr Name Operation 1 VDD1 5V power supply 2 GND1 OV Ground 3 AX A signal output 4 BX B signal output S SIN Sinus analog amplify output for test 6 COS Cosnus analog amplify output for test 7 GND1 additional Ground Pin 8 VDD1 5V supply voltage for MR Sensor 9 FC1 Cosinus 1 Input for MR Sensor 10 FC2 Cosinus 2 Input for MR Sensor n FS2 Sinus 2 Input for MR Sensor 12 FSi Sinus 1 Input for MR Sensor 13 GND1 Ground for MR Sensor EEPROM Configuration 1 fold interpolation 4 times resolution wjnj 10 fold interpolation 40 times resolution 50 fold interpolation 200 times resolution Subject to technical changes August 13 2008 SENS TEC EKW01 Evaluation Kit for Angle Measur
3. 01 Evaluation Kit for Angle Measurement LK29A AMR sensor for Angle Measurement The LK29A is a magnetoresistive FIXPITCH sensor with an active structure adapted to a measurement scale with a 1 mm pole pitch The sensor chip features 2 complete Wheatstone bridges The signal at the output of the first bridge corresponds to the sine of the measurement scale while the matching cosine signal is available at the output of the second bridge The sensor operates without the need for a stabilising magnetic field As long as the sensor is used in saturation the amplitude is largely independent of the air gap Typically that is up to half the pitch of the measurement scale 0 5 mm air gap A separation of up to 0 7 mm is possible with reduced performance Absolute Maximum Ratings Operating temperature range T 20 C up to 85 C Electrical Characteristics 25 C H gt 30 kA m Sensor resistance 1 8 0 6 KQ Bridge resistance OR 3 6 1 2 kQ Signal amplitude in the operating distance 2 8 mV V Offset lt 2 mV V Offset drift AUor Us At lt 100 nV Vh Temperature coefficient of signal amplitude Tku 3 8 0 8 10 K Temperature coefficient of Rs 2 6 0 6 10 K Sensitec reserves the right to modify technical specifications without prior notice Pin Configuration LK29AG N n Q Q a gt www sensitec com User Manual Subject to technical changes Sensitec GmbH Page 9 of 12 August 13 2008
4. SENS TEC EKW01 Evaluation Kit for Angle Measurement LK40B AMR sensor for Angle Measurement The LK40B is a magnetoresistive FREEPITCH sensor not tied to a particular pole length The sensor detects 2 pole magnets and pole lengths of more than 2 mm It features 2 complete Wheatstone bridges The signal at the output of the bridges corresponds to the sine and cosine The sensor operates without the need for a stabilising magnetic field As long as the sensor is used in saturation the amplitude is largely independent of the air gap Typically that is up to half the pitch of the measurement scale as long as the pole structure is regular With reduced performance even a bigger air gap is possible Absolute Maximum Ratings m _ a Operating temperature range T 40 C up to 120 C 120 C limited lifetime 7200 h Electrical Characteristics 25 C H gt 30 kA m Sensor resistance 1 7 0 7 kQ Bridge resistance Re 3 4 1 4 kO Signal amplitude in the operating distance 8 13 mV V Offset lt 2 mV Offset drift AUor Us At lt 100 nV Vh Temperature coefficient of signal amplitude 4 0 0 8 10 K Temperature coefficient of Rs 2 6 0 6 10 K Sensitec reserves the right to modify technical specifications without prior notice Pin Configuration LK40BG www sensitec com User Manual Subject to technical changes Sensitec GmbH Page 10 of 12 August 13 2008 SENS TEC EKW01 Evaluation Kit f
5. SENS TEC MagnetoResistive Sensors EKW01 Evaluation Kit for Angle Measurement User Manual EKW01 DSE 03 www sensitec com User Manual Subject to technical changes Sensitec GmbH Page 1 of 12 August 13 2008 SENS TEC EKW01 Evaluation Kit for Angle Measurement User Manual This evaluation kit provides the opportunity to learn the features and benefits of AMR sensor technology as used in angle measurement systems in a quick and easy manner Please note that the parts are sensitive to electrostatic fields Please take care to observe the polarity of the signal processing circuit and do not change the jumper while a voltage is applied Please do not solder too hot resp too long That can damage the sensor A Please do not touch parts with the magnet or other magnetic parts and keep it away from strong electromagnetic fields The kit includes a 9 V battery and a cable including voltage controller and an LED for displaying the output signal green A red B rectangular signal If an external voltage supply is used 5 V this can be connected directly to the signal processing circuit In this case a connecting cable is not necessary The products included in this package are not RoHS compliant and are therefore not intended for private use Please follow local regulations regarding the disposal of batteries Sensitec can dispose of the parts on your behalf if they are returned cost free to our premises www sensit
6. ec com User Manual Subject to technical changes Sensitec GmbH Page 2 of 12 August 13 2008 SENS TEC EKW01 Evaluation Kit for Angle Measurement The quality of the measurement signals and the subsequent evaluation depends primarily on the measuring setup and the arrangement of the sensor and the measurement scale Please keep this in mind when first using the evaluation kit A mechanical guidance mechanism which guides the sensor along the scale is ideal The components have been specially selected to allow study of the different influences on the resolution and accuracy of a length measurement system for example the pitch of the magnetic scale or the interpolation factor of the interpolation ASIC The scales have a different colour depending on the pole pitch and can thus be assigned easily to the corresponding sensors With the exception of the LK40 sensor yellow which can be used for pole pitches above 2 mm all other sensors have a fixed assignment to a scale with a corresponding pole pitch The standard measuring configuration between sensor and scale is shown in figure 5 of the enclosed overview of measuring configurations Figures 1 2 3 and 4 show arrangements which can be executed using the LK40 sensor and the bar magnet Sensors of the LK14 LK16 and LK29 series are not suitable for this arrangement A reference value for the maximum air gap between the leading face of the sensor and the scale surface is half the pitch mea
7. ement LK14A AMR sensor for Angle Measurement The LK14A is a magnetoresistive FIXPITCH sensor with an active structure adapted to a measurement scale with a 5 mm pole pitch The sensor chip features 2 complete Wheatstone bridges The signal at the output of the first bridge corresponds to the sine of the measurement scale while the matching cosine signal is available at the output of the second bridge The sensor operates without the need for a stabilising magnetic field As long as the sensor is used in saturation the amplitude is largely independent of the air gap Typically that is up to half the pitch of the measurement scale 2 5 mm air gap A separation of up to 3 5 mm is possible with reduced performance Absolute Maximum Ratings Operating temperature range T 20 C up to 85 C Electrical Characteristics 25 C H gt 30 kA m Sensor resistance 1 5 0 5 kQ Bridge resistance 3 1 kO Signal amplitude in the operating distance p Uae 29 5 mv V Offset Uor Us lt 1mvV V Offset drift AUo Us At s 100 nV Vh Temperature coefficient of signal amplitude 4 0 0 8 10 K Temperature coefficient of R TKrs 2 6 0 6 10 K Sensitec reserves the right to modify technical specifications without prior notice Pin Configuration LK14AG N Yn Q O no Q 9 www sensitec com User Manual Subject to technical changes Sensitec GmbH Page 7 of 12 August 13 2008 SENS TEC EKW01 Evaluat
8. ion Kit for Angle Measurement LK16A AMR sensor for Angle Measurement The LK16A is a magnetoresistive FIXPITCH sensor with an active structure adapted to a measurement scale with a 2 mm pole pitch The sensor chip features 2 complete Wheatstone bridges The signal at the output of the first bridge corresponds to the sine of the measurement scale while the matching cosine signal is available at the output of the second bridge The sensor operates without the need for a stabilising magnetic field As long as the sensor is used in saturation the amplitude is largely independent of the air gap Typically that is up to half the pitch of the measurement scale 1 mm air gap A separation of up to 1 5 mm is possible with reduced performance Absolute Maximum Ratings Operating temperature range 20 C up to 85 C Electrical Characteristics 25 C H gt 30 kA m Sensor resistance Bridge resistance Re 3 4 1 2 kQ Signal amplitude in the operating distance 2 8 mV V Offset lt 2 mV Offset drift AUor Ug At f lt 100 nV Vh Temperature coefficient of signal amplitude 4 0 0 8 10 K Temperature coefficient of Rs 2 5 0 6 10 K Sensitec reserves the right to modify technical specifications without prior notice Rs 1 7 0 6 kQ Pin Configuration LK16AG N n Q O ao T www sensitec com User Manual Subject to technical changes Sensitec GmbH Page 8 of 12 August 13 2008 SENS TEC EKW
9. or Angle Measurement Mechanical Dimensions of Ceramic Board The thickness of the ceramic is 0 7 mm The pads are covered with solderable material 7 25 oo F J y Sensor tin aoa l L co Lo i O 7 35 Kit content fa fume Red runna 200 neat orp ong en O maono ed ear eat 00341011 tn pole isn fi erno O Terai Sieriaton tasers o few ___ at cabo tn 0 andcannesiar O O Oo fener feventey o ee O ewe _ oceunenaion __ Pconfaaton menaaara aaas O O ooo ee O o www sensitec com User Manual Subject to technical changes Sensitec GmbH Page 11 of 12 August 13 2008 EKW01 Evaluation Kit for Angle Measurement General nformation Product Status SENS TEC The product is in series production Note The status of the product may have changed since this user manual was published The latest information is available on the internet at www sensitec com Right to make changes Sensitec GmbH reserves the right to make changes without notice in the products includ ing software described or con tained herein in order to im prove design and or perform ance Sensitec GmbH assumes no responsibility or liability for the use of any of these pro ducts Application information Applications that are described herein for any of these products are for illustrative purposes only Sensitec GmbH makes no representation or warranty that such applications will be suitable for the specified use without further
10. sured in mm For further information and advice please do not hesitate to contact us www sensitec com User Manual Subject to technical changes Sensitec GmbH Page 3 of 12 August 13 2008 SENS TEC EKW01 Evaluation Kit for Angle Measurement Setting up Measurements No Depiction Configuration Application Example Rotating magnet sensor mounted in the Absolute angle measurement up to 180 axis of rotation on a substrate at the shaft end axial Rotating magnet sensor mounted on a Absolute angle measurement up to 180 substrate perpendicularly to the axis of at the shaft end radial rotation Magnet moves linearly sensor mounted Absolute length measurement along a at the edge of a substrate magnet Magnet moves linearly sensor mounted Magnetic switch at the edge of a substrate Magnetic pole ring with fixed pitch sensor Incremental angle measurement at the mounted on substrate radially to the pole shaft circumference ring sensor surface in the plane of the pole ring www sensitec com User Manual Subject to technical changes Sensitec GmbH Page 4 of 12 August 13 2008 EKW01 Evaluation Kit for Angle Measurement Testboard EA nl 0060601 Signal with Interpolation ASIC Characteristic e Interpolation factor 1 10 50 e Variable interpolation with jumper e TTL CMOS compatible output e Output incremental e Output frequency AX BX up to 400KHz Application e Decoder incremental angle
11. testing or modifi cation SENS TEC MagnetoResistive Sensors Sensitec GmbH Georg Ohm Stra e 11 35633 Lahnau Germany Fon 49 0 64 41 97 88 0 Fax 49 0 64 41 97 88 17 E Mail info sensitec com www sensitec com Life critical applications These products are not quali fied for use in life support appli ances aeronautical applica tions or devices or systems where malfunction of these products can reasonably be expected to result in personal injury Solutions for measuring e Position e Angle e Magnetic field e Current Copyright 2008 by Sensitec GmbH Germany All rights reserved No part of this document may be copied or reproduced in any form or by any means without the prior written agreement of the copyright owner The information in this document is subject to change without notice Sensitec GmbH does not assume any liability for any consequence of its use www sensitec com Sensitec GmbH User Manual Page 12 of 12 Subject to technical changes August 13 2008
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